Researchers Database

YOSHIMURA Tomokazu

FacultyFaculty Division of Natural Sciences Research Group of Chemistry
PositionProfessor
Last Updated :2024/02/22

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Profile and Settings

  • Name (Japanese)

    Yoshimura
  • Name (Kana)

    Tomokazu

Research Interests

  • Colloid and surface chemistry

Research Areas

  • Nanotechnology/Materials, Basic physical chemistry
  • Nanotechnology/Materials, Functional solid-state chemistry
  • Nanotechnology/Materials, Green/sustainable/environmental chemistry

Research Experience

  • Apr. 2014, 奈良女子大学研究院自然科学系化学領域 教授
  • Apr. 2012, Mar. 2014, 奈良女子大学研究院自然科学系化学領域 准教授(組織変更による配置換)
  • Apr. 2007, Mar. 2012, 奈良女子大学大学院人間文化研究科共生自然科学専攻 准教授(学校教育法改正に伴い、名称変更)(理学部化学科兼担)
  • Apr. 2006, Mar. 2007, 奈良女子大学大学院人間文化研究科共生自然科学専攻 助教授(理学部化学科兼担)
  • Apr. 2001, Mar. 2006, 東京理科大学理学部応用化学科 助手・講師

Education

  • Apr. 1998, Mar. 2001, Kumamoto University, Graduate School, Division of National Science and Technology, 生産科学専攻

Teaching Experience

  • Apr. 2022, 9999
  • Apr. 2022, 9999
  • Apr. 2022, 9999
  • Apr. 2022, 9999
  • -, Nara Women's University, Apr. 2021

Association Memberships

  • 日本中性子科学会, 9999
  • 高分子学会, 9999
  • 色材協会
  • アメリカ化学会
  • 日本油化学会, 9999
  • 日本化学会コロイドおよび界面化学部会, 9999
  • 日本化学会, 9999

Ⅱ.研究活動実績

Published Papers

  • Refereed, Colloid Surf. A, Adsorption and Aggregation Properties of Homogeneous Polyoxyethylene Alkyl Ether- and Ester-Type Nonionic Surfactants with Multi-Branched Double Chains, Shiho Yada; Yuiko Yoshioka; Masashi Ohno; Toshinari Koda; Tomokazu Yoshimura, 05 Sep. 2022, 648, 129247, Scientific journal, 10.1016/j.colsurfa.2022.129247
  • Langmuir, American Chemical Society (ACS), Effect of Spacer Structures on the Interfacial Adsorption and Micelle Properties of Quaternary Ammonium Salt-Based Gemini Surfactants, Tsukasa Morita; Shiho Yada; Tomokazu Yoshimura, 11 Jan. 2022, 38, 1, 156, 163, Scientific journal, 10.1021/acs.langmuir.1c02297
  • Langmuir, American Chemical Society (ACS), Adsorption and Aggregation Behavior of Mixtures of Quaternary-Ammonium-Salt-Type Amphiphilic Compounds with Fluorinated Counterions and Surfactants, Risa Kawai; Shiho Yada; Tomokazu Yoshimura, 14 Sep. 2021, 37, 38, 11330, 11337, Scientific journal, 10.1021/acs.langmuir.1c01912
  • Chemistry – A European Journal, Wiley, Fine Tunable, Redox Active Octapalladium Chains Supported by Linear Tetraphosphines, Leading to Dynamically 1D Self‐Assembled Coordination Polymers, Tomoaki Tanase; Kanako Nakamae; Haruka Miyano; Yasuyuki Ura; Yasutaka Kitagawa; Shiho Yada; Tomokazu Yoshimura; Takayuki Nakajima, 19 Aug. 2021, 27, 47, 12078, 12103, Scientific journal, 10.1002/chem.202101715
  • Journal of Molecular Liquids, Elsevier BV, Layer Structure of Quaternary-Ammonium-Salt-type Amphiphilic Gemini and Trimeric Ionic Liquids, Risa Kawai; Shiho Yada; Tomokazu Yoshimura, Aug. 2021, 336, 116459, 116459, Scientific journal, 10.1016/j.molliq.2021.116459
  • Refereed, ACS Omega, American Chemical Society (ACS), Maltotriose–Chlorin e6 Conjugate Linked via Tetraethyleneglycol as an Advanced Photosensitizer for Photodynamic Therapy. Synthesis and Antitumor Activities against Canine and Mouse Mammary Carcinoma Cells, A. Narumi; R. Rachi; H. Yamazaki; S. Kawaguchi; M. Kikuchi; H. Konno; T. Osaki; Y. Okamoto; X. Shen; T. Kakuchi; H. Kataoka; A. Nomoto; T. Yoshimura; S. Yano, Glycoconjugated chlorins represent a promising class of compounds that meet the requirements for the third-generation photosensitizer (PS) for photodynamic therapy (PDT). We have focused on the use of glucose (Glc) to improve the performance of the PS based on the Warburg effect-a phenomenon where tumors consume higher Glc levels than normal cells. However, as a matter of fact, Glc-conjugation has a poor efficacy in hydrophilic modification; thus, the resultant PS is not suitable for intravenous injection. In this study, a Glc-based oligosaccharide, such as maltotriose (Mal3), is conjugated to chlorin e6 (Ce6). The conjugation is assisted by two additional molecular tools, such as propargyl amine and a tetraethylene glycol (TEG) derivative. This route produced the target Mal3-Ce6 conjugate linked via the TEG spacer (Mal3-TEG-Ce6), which shows the required photoabsorption properties in the physiological media. The PDT test using canine mammary carcinoma (SNP) cells suggested that the antitumor activity of Mal3-TEG-Ce6 is extremely high. Furthermore, in vitro tests against mouse mammary carcinoma (EMT6) cells have been demonstrated, providing insights into the photocytotoxicity, subcellular localization, and analysis of cell death and reactive oxygen species (ROS) generation for the PDT system with Mal3-TEG-Ce6. Both apoptosis and necrosis of the EMT6 cells occur by ROS that is generated via the photochemical reaction between Mal3-TEG-Ce6 and molecular oxygen. Consequently, Mal3-TEG-Ce6 is shown to be a PS showing the currently desired properties., 16 Mar. 2021, 6, 10, 7023, 7033, Scientific journal, True, 10.1021/acsomega.0c06316
  • Colloids Surf., A, Elsevier BV, Unique Interfacial Adsorption Behavior of a Hydroxy Group-Containing Amino Acid Surfactant, S. Yada; M. Wakizaka; H. Shimosegawa; H. Fujita; M. Yamada; Y. Matsue; T. Yoshimura, Feb. 2021, 611, 125757, 125757, Scientific journal, 10.1016/j.colsurfa.2020.125757
  • JOURNAL OF OLEO SCIENCE, JAPAN OIL CHEMISTS SOC, Micelle Formation of Monoammonium Glycyrrhizinate, Keisuke Matsuoka; Mamoru Arima; Yusuke Goto; Shiho Yada; Tomokazu Yoshimura, Monoammonium glycyrrhizinate is produced by the neutralization of glycyrrhizic acid from plant licorice with ammonia. In this study, the physicochemical properties of aqueous monoammonium glycyrrhizinate were investigated from the viewpoint of surface chemistry. The structure of the amphiphilic molecule is bola type, comprising two glucuronic acid moieties having two carboxylic acids groups and an aglycone part having a carboxylic acid at the opposite end of the molecule from the glucuronic acids. We found that the physicochemical properties of aqueous monoammonium glycyrrhizinate are dependent on the ionization of the carboxylic acid groups. The solubility of monoammonium glycyrrhizinate gradually increased above pH 4 in the buffer solution. The critical micelle concentration (CMC) and surface tension at the CMC (gamma CMC) of monoammonium glycyrrhizinate were determined by the surface tension method to be 1.5 mmol L-1 and 50 mN m-1 in pH 5 buffer and 3.7 mmol L-1 and 51 mN m-1 in pH 6 buffer, respectively. The surface tension gradually decreased with increasing concentration of monoammonium glycyrrhizinate in the pH 7 buffer, but the CMC was not defined by the curve. Light scattering measurements also did not reveal a clear CMC in the pH 7 buffer. The ionization of the carboxylic acid groups in the bola-type amphiphilic molecule with increasing pH is disadvantageous for micelle formation. Cryo-transmission electron microscopy showed that monoammonium glycyrrhizinate forms rod-like micelles in pH 5 buffer, and small angle X-ray scattering experiments confirmed that the average micellar structure was rod-like in pH 5 buffer. Thus, it was found that monoammonium glycyrrhizinate can form micelles only in weakly acidic aqueous solutions., 2021, 70, 7, 911, 918, Scientific journal, 10.5650/jos.ess21046
  • Refereed, Molecules, MDPI AG, Surface Adsorption Properties and Layer Structures of Homogeneous Polyoxyethylene-Type Nonionic Surfactants in Quaternary-Ammonium-Salt-Type Amphiphilic Gemini Ionic Liquids with Oxygen- or Nitrogen-Containing Spacers, R. Kawai; M. Niki; S. Yada; T. Yoshimura, The amphiphilic ionic liquids containing an alkyl chain in molecules form nano-structure in the bulk, although they also show surface activity and form aggregates in aqueous solutions. Although insights into the layer structures of ionic liquids were obtained using X-ray and neutron scattering techniques, the nanostructures of ionic liquids remain unclear. Herein, the surface adsorption and bulk properties of homogeneous polyoxyethylene (EO)-type nonionic surfactants (CxEO6; x = 8, 12, or 16) were elucidated in quaternary-ammonium-salt-type amphiphilic gemini ionic liquids with oxygen or nitrogen-containing spacers [2Cn(Spacer) NTf2; (Spacer) = (2-O-2), (2-O-2-O-2), (2-N-2), (2/2-N-2), (3), (5), or (6); n = 10, 12, or 14 for (2-O-2) and n = 12 for all other spacers] by surface tension, small- and wide-angle X-ray scattering, cryogenic transmission electron microscopy, and viscosity measurements. The surface tension of C12EO6 in 2Cn(Spacer) NTf2 with oxygen-containing spacers increased with increasing concentration of C12EO6, becoming close to that of C12EO6 alone, indicating that the amphiphilic ionic liquid adsorbed at the interface was replaced with CxEO6. In contrast, both 2Cn(Spacer) NTf2 with nitrogen-containing spacers and nonionic surfactants remained adsorbed at the interface at high concentrations. In the bulk, it was found that 2Cn(Spacer) NTf2 formed layer structures, in which the spacing depended on the alkyl chain length of CxEO6. These insights are expected to advance the practical applications of amphiphilic ionic liquids such as ion permeation, drug solubilization, and energy delivery systems., 22 Oct. 2020, 25, 21, 4881, 4881, Scientific journal, 10.3390/molecules25214881
  • Refereed, Pharmaceuticals, MDPI AG, Novel Photosensitizer β-Mannose-Conjugated Chlorin e6 as a Potent Anticancer Agent for Human Glioblastoma U251 Cells, Y. Shinoda, K. Kujirai, K. Aoki, M. Morita, M. Masuda, L. Zhang, Z. Kaixin, A. Nomoto, T. Takahashi, Y. Tsuneoka, J. Akimoto, H. Kataoka, R. Rachi, A. Narumi, T. Yoshimura, S. Yano, Y. Fujiwara, A photosensitizer is a molecular drug for photodynamic diagnosis and photodynamic therapy (PDT) against cancer. Many studies have developed photosensitizers, but improvements in their cost, efficacy, and side effects are needed for better PDT of patients. In the present study, we developed a novel photosensitizer β-mannose-conjugated chlorin e6 (β-M-Ce6) and investigated its PDT effects in human glioblastoma U251 cells. U251 cells were incubated with β-M-Ce6, followed by laser irradiation. Cell viability was determined using the Cell Counting Kit-8 assay. The PDT effects of β-M-Ce6 were compared with those of talaporfin sodium (TS) and our previously reported photosensitizer β-glucose-conjugated chlorin e6 (β-G-Ce6). Cellular uptake of each photosensitizer and subcellular distribution were analyzed by fluorescence microscopy. β-M-Ce6 showed 1000× more potent PDT effects than those of TS, and these were similar to those of β-G-Ce6. β-M-Ce6 accumulation in U251 cells was much faster than TS accumulation and distributed to several organelles such as the Golgi apparatus, mitochondria, and lysosomes. This rapid cellular uptake was inhibited by low temperature, which suggested that β-M-Ce6 uptake uses biological machinery. β-M-Ce6 showed potent PDT anti-cancer effects compared with clinically approved TS, which is a possible candidate as a next generation photosensitizer in cancer therapy., 16 Oct. 2020, 13, 10, 316, 316, Scientific journal, True, 10.3390/ph13100316
  • Refereed, Colloids Surf.,A, Elsevier BV, Physicochemical and Solution Properties of Quaternary-Ammonium-Salt-type Amphiphilic Gemini Ionic Liquids with Spacers Containing Oxygen or Nitrogen, R. Kawai; M. Niki; S. Yada; T. Yoshimura, Oct. 2020, 603, 125218, 125218, Scientific journal, 10.1016/j.colsurfa.2020.125218
  • Refereed, Oleoscience, Japan Oil Chemists' Society, Amino Acid Surfactants with Hydroxy Group, Tomokazu YOSHIMURA; Shiho YADA, Sep. 2020, 20, 9, 425, 430, Scientific journal, 10.5650/oleoscience.20.425
  • Refereed, Langmuir, American Chemical Society (ACS), Microstructural Characterization of Foam Formed by a Hydroxy Group-Containing Amino Acid Surfactant Using Small-Angle Neutron Scattering, Shiho Yada; Hiroshi Shimosegawa; Hiroya Fujita; Munehiro Yamada; Yukako Matsue; Tomokazu Yoshimura, 14 Jul. 2020, 36, 27, 7808, 7813, Scientific journal, 10.1021/acs.langmuir.0c00791
  • Refereed, Langmuir, American Chemical Society (ACS), Surface Adsorption and Bulk Properties of Surfactants in Quaternary-Ammonium-Salt-Type Amphiphilic Monomeric and Gemini Ionic Liquids, Risa Kawai; Shiho Yada; Tomokazu Yoshimura, 19 May 2020, 36, 19, 5219, 5226, Scientific journal, 10.1021/acs.langmuir.0c00541
  • Refereed, Journal of the Japan Society of Colour Material, Japan Society of Colour Material, Quaternary-Ammonium-Salt-Type Amphiphilic Ionic Liquids, Risa KAWAI; Shiho YADA; Tomokazu YOSHIMURA, 20 Mar. 2020, 93, 3, 91, 98, Scientific journal, 10.4011/shikizai.93.91
  • Refereed, Langmuir : the ACS journal of surfaces and colloids, Adsorption and Aggregation Properties of Gemini-Type Amphiphilic Dendrimers., Tomokazu Yoshimura; Nara-Karyn Kawano; Shiho Yada; Hiroki Iwase, Gemini-type amphiphilic dendrimers featuring two dodecyl chains and two poly(amidoamine) dendrons (2C12-2denGn, where n is the dendron (den) generation (G) number (1, 2, 3, 4, or 5)) were synthesized using ethylenediamine, alkyl bromide, and methyl acrylate. These gemini-type dendrimers were characterized by surface tension, pyrene fluorescence, static light scattering, and small-angle X-ray scattering. The results showed clear breakpoints in the surface tension versus concentration plots, which indicated adsorption at the air/water interface and micelle formation in solution despite the bulky dendron structure (e.g., generations 3 to 5), contrasting the behavior of conventional surfactants. The 2C12-2denGn dendrimers could be densely packed at the air/water interface owing to enhanced interaction between the dendrons and between the alkyl chains. Furthermore, these dendrimers formed spherical micelles at a concentration of 5.0 mmol dm-3 in solution (pH 9); the overall micelle size was not dependent on the generation number of the dendron, while as the generation number increased, the core radius of the micelle decreased, and the shell thickness of the micelle increased., 21 Jan. 2020, 36, 2, 563, 570, Scientific journal, True, 10.1021/acs.langmuir.9b02506
  • Refereed, J. Mol. Liq., Characterization and Solution Properties of Adamantane-Containing Quaternary-Ammonium-Salt-Type Amphiphilic Ionic Liquids, R. Kawai, S. Yada, T. Yoshimura, 15 Nov. 2019, 294, 111586, Scientific journal, 10.1016/j.molliq.2019.111586
  • Refereed, 科学と工業(大阪工研協会), 泡沫の新たな構造解析法(解説), 泡沫の新たな構造解析法(解説), Nov. 2019, 93, 374, 378, Scientific journal
  • Refereed, Phys. Chem. Chem. Phys., Physicochemical and Solution Properties of Quaternary-Ammonium-Salt-Type Amphiphilic Trimeric Ionic Liquids, K. Risa, S. Yada, T. Yoshimura, 23 Oct. 2019, 21, 25065, 25071, Scientific journal, 10.1039/C9CP05541J
  • Refereed, J. Mol. Liq., Solubilization Ability of Star-Shaped Trimeric Quaternary Ammonium Bromide Surfactant, K. Matsuoka, N. Takahashi, S. Yada, T. Yoshimura, 01 Oct. 2019, 291, 111254, Scientific journal, 10.1016/j.molliq.2019.111254
  • Refereed, J. Oleo Sci., Superoxide Scavenging Activity of Gold, Silver, and Platinum Nanoparticles Capped with Sugar-based Nonionic Surfactants, K. Matsuoka, Y. Nakatani, T. Yoshimura, T. Akasaki, 04 Sep. 2019, 68, 9, 847, 854, Scientific journal, 10.5650/jos.ess19079
  • Refereed, ACS Omega, Characterization and Solution Properties of Quaternary-Ammonium-Salt-Type Amphiphilic Gemini Ionic Liquids, R. Kawai, S. Yada, T. Yoshimura, 20 Aug. 2019, 4, 10, 14242, 14250, Scientific journal, 10.1021/acsomega.9b01660
  • Refereed, J. Mol. Liq., Adsorption and Aggregation Properties of Alkoxy-Group-Modified Homogeneous Polyoxyethylene Alkyl Ether Nonionic Surfactants, S. Yada, T. Suzuki, S. Hashimoto, T. Yoshimura, 15 Jun. 2019, 284, 586, 591, Scientific journal, 10.1016/j.molliq.2019.03.161
  • Refereed, Acc. Mater. Surf. Res.(材料表面), 環境負荷の低減を目指した非イオン界面活性剤の開発, 矢田詩歩,吉村倫一, 27 Apr. 2019, 4, 2, 69, 8, Scientific journal
  • Refereed, Langmuir, Structure and Catalytic Activities of Gold Nanoparticles Protected by Homogeneous Polyoxyethylene Alkyl Ether Type Nonionic Surfactants, S. Yada; T. Yoshimura, 16 Apr. 2019, 35, 15, 5241, 5249, Scientific journal, 10.1021/acs.langmuir.9b00142
  • Refereed, J. Colloid Interface Sci., ACADEMIC PRESS INC ELSEVIER SCIENCE, Rheo-SANS Study on Relationship between Micellar Structures and Rheological Behavior of Cationic Gemini Surfactants in Solution, H. Iwase, R. Kawai, K. Morishima, S. Takata, T. Yoshimura, M. Shibayama, Hypothesis: Gemini surfactant 12-2-12 (dimethylene-1,2-bis(dodecyl dimethylammonium bromide)) solutions are known to show shear thickening and thinning under salt-free conditions. Because the rheological behavior of the wormlike micelles formed by 12-2-12 in solution is related to their structure, we expected that changes to the precursor structure would affect their rheological behaviors. It is also important to understand the effect of the introduction of a spacer group in the 12-2-12 molecules on the rheological behavior and structure of the wormlike micelles under shear flow.Experiments: Simultaneous small-angle neutron scattering and rheological measurements (Rheo-SANS) of the 12-2-12 solutions were performed. We exhaustively studied the structural changes in the wormlike micelles upon increasing shear rate.Findings: We found that the wormlike micelles were oriented in the direction of the flow due to elongation and that changes to the precursor of the wormlike micelles did not affect the shear thickening. As a precursor structural change of shear thinning, the wormlike micelles elongated while maintaining their orientation. We found that an increase in the molecular curvature of the 12-2-12 due to the introduction of a spacer-group contributed to the unusual rheological behaviors of the wormlike micelles in a solution under shear flow. (C) 2018 Elsevier Inc. All rights reserved., 07 Mar. 2019, 538, 357, 366, Scientific journal, 10.1016/j.jcis.2018.11.104
  • Refereed, Colloids Surf.,A, Emulsification, Solubilization and Detergency Behaviors of Homogeneous Polyoxypropylene-Polyoxyethylene Alkyl Ether Type Nonionic Surfactants, S. Yada, K. Matsuoka, Y. Nagai-Kanasaki, K. Gotoh, T. Yoshimura, 05 Mar. 2019, 564, 51, 58, Scientific journal, 10.1016/j.colsurfa.2018.12.030
  • Refereed, 月刊ファインケミカル(シーエムシー出版), 四級アンモニウム塩系両親媒性イオン液体の開発(特集「イオン液体の開発と応用展開」), 河合里紗,吉村倫一, 15 Sep. 2018, 47, 9, 5, 13, Scientific journal
  • Refereed, Journal of Molecular Liquids, Elsevier B.V., Solubilization ability of N,N-dimethyl-N-alkyladamantylammonium bromide, Keisuke Matsuoka; Rinpei Omori; Shiho Yada; Tomokazu Yoshimura; Hiroki Iwase, Adamantane is difficult to dissolve in water owing to its bulky steric hydrocarbon structure. We designed a novel amphiphilic molecule by introducing an alkyl chain and a cation group into an adamantyl group. N,N-dimethyl-N-alkyladamantylammonium bromide (CnAdAB n is the alkyl chain length, where n = 10, 12, and 14) dissolves easily in water by forming micelles above the critical micelle concentration. Aggregates of this surfactant series form small nonspherical micelles several nanometers in size with relative small aggregation number 53 (n = 10), 59 (n = 12), and 63 (n = 14) at the typical concentration. Small-angle X-ray scattering measurement showed that the micellar structure of C12AdAB was changed slightly by solubilization of naphthalene and stearic acid. Moreover, the solubilization ability of the aggregates was studied using naphthalene and long-alkyl-chain fatty acids (myristic, palmitic, and stearic acids). The same solubilization experiments were performed using typical cationic surfactants (dodecyltrimethylammonium bromide and a gemini surfactant) for comparison. The molar solubilization ratios indicate that the CnAdAB series can solubilize the aromatic compound naphthalene as well as the other surfactants, whereas they can barely solubilize the long-alkyl-chain fatty acids. The solubilization stability can be analyzed by estimating the Gibbs free energy change (ΔG0) for the transfer of solubilizate molecules to the aggregate phase. The gemini surfactant system showed the largest negative value of ΔG0 for both naphthalene and the fatty acids. On the other hand, solubilization of fatty acids into CnAdAB micelles was not advantageous energetically. These results indicate that the solubilization ability of CnAdAB surfactants is not generally suitable for solubilization of long-alkyl-chain fatty acids owing to the smallness of the micelles., 15 Jun. 2018, 260, 131, 137, Scientific journal, 10.1016/j.molliq.2018.03.078
  • Refereed, Colloid & Interface Communication, 分岐2鎖型界面活性剤の水溶液物性に及ぼす親水基と疎水鎖の影響, 吉岡優惟子,矢田詩歩,ヨシムラ, 10 May 2018, 43, 2, 40, 43, Scientific journal
  • Refereed, Journal of Molecular Liquids, Elsevier B.V., Adsorption dynamics of homogeneous polyoxypropylene-polyoxyethylene alkyl ether nonionic surfactants at the air/water interface, Shiho Yada; Toshiyuki Suzuki; Satoru Hashimoto; Tomokazu Yoshimura, The dynamic surface tensions of two homogeneous polyoxyethylene (EO) alkyl ether nonionic surfactants with terminal hydroxy group (C12EOx, where C12 is a dodecyl chain and x is the length of the EO chain x = 6, 8) and two homogeneous polyoxypropylene-polyoxyethylene (PO-EO) alkyl ether nonionic surfactants (C12EOxPO3, where PO3 is a trioxypropylene chain inserted between the EOx and the terminal hydroxy group) were measured using the maximum bubble pressure method. The effects of EO chain length, the presence or absence of the PO3 chain, and the surfactant concentration on the maximum rates of surface-tension reduction and diffusion coefficient were investigated. The C12EO6PO3 surfactant exhibited the fastest rate of surface-tension reduction of the four systems studied, despite its complex hydrophobic-alkyl-chain/hydrophilic-EO-chain/hydrophobic-PO-chain structure that differs from that of conventional EO alkyl ether surfactants. The diffusion coefficients obtained from short and long time analyses indicate that surfactant diffusion to the subsurface is faster for the C12EOxPO3 surfactants than the C12EOx surfactants (short time data), while surfactant adsorption from the subsurface to the air/water interface is faster for the C12EOx surfactants than the C12EOxPO3 surfactants (long time data)., 01 Apr. 2018, 255, 208, 214, Scientific journal, 10.1016/j.molliq.2018.01.150
  • Refereed, 塗装工学, 各種産業分野への利用を目指した新規界面活性剤の開発(解説), 吉村倫一, Apr. 2018, 53, 4, 122, 130, Scientific journal
  • Refereed, 化学工業, 単一鎖長ポリオキシプロピレン-ポリオキシエチレン系非イオン界面活性剤の開発(解説), 矢田詩歩,吉村倫一, 01 Feb. 2018, 69, 2, 41, 46, Scientific journal
  • Refereed, Colloids Surf., A, ELSEVIER SCIENCE BV, Tadpole-Type Amphiphilic Dendrimers with Bulky Dendrons: Adsorption and Aggregation Properties, T. Yoshimura, A. Ebihara, H. Iwase, 20 Nov. 2017, 533, 197, 203, Scientific journal, 10.1016/j.colsurfa.2017.08.010
  • Refereed, J. Oleo Sci., JAPAN OIL CHEMISTS SOC, Dynamic Surface Tension of Heterogemini Surfactants with Quaternary Ammonium Salt and Gluconamide or Sulfobetaine Headgroups, T. Yoshimura, K. Nyuta, 01 Oct. 2017, 66, 10, 1139, 1147, Scientific journal, 10.5650/jos.ess17021
  • Refereed, Langmuir, AMER CHEMICAL SOC, Structure and Rheology of Wormlike Micelles Formed by Fluorocarbon-Hydrocarbon-Type Hybrid Gemini Surfactant in Aqueous Solution, K. Morishima, S. Sugawara, T. Yoshimura, M. Shibayama, 20 Jun. 2017, 33, 24, 6084, 6091, Scientific journal, 10.1021/acs.langmuir.7b00902
  • Refereed, Colloid Polym. Sci., SPRINGER, Single-Alkyl and Multi-Alkyl Chain-Containing Amphiphilic Oligomers with Several Sugar Side Chains: Solution Properties and Nano-Structural Analysis of Aggregates by SANS, T. Yoshimura, Y. Nakatani, K. Matsuoka, K. Akutsu, H. Iwase, May 2017, 295, 5, 793, 802, Scientific journal, 10.1007/s00396-017-4063-3
  • Refereed, Langmuir, AMER CHEMICAL SOC, Adsorption and Aggregation Properties of Homogeneous Polyoxypropylene-Polyoxyethylene Alkyl Ether Type Nonionic Surfactants, S. Yada, T. Suzuki, S. Hashimoto, T. Yoshimura, 18 Apr. 2017, 33, 15, 3794, 3801, Scientific journal, 10.1021/acs.langmuir.7b00104
  • Refereed, J. Oleo Sci., JAPAN OIL CHEMISTS SOC, Synthesis and Solution Properties of Adamantane-Containing Quaternary Ammonium Salt-type Cationic Surfactants: Hydrocarbon-based, Fluorocarbon-based and Bola-type, T. Yoshimura, M. Okada, K. Matsuoka, 01 Oct. 2016, 65, 10, 843, 852, Scientific journal, 10.5650/jos.ess16095
  • Refereed, Colloids Surf., A, ELSEVIER SCIENCE BV, Aggregate Formation of Glycyrrhizic Acid, K. Matsuoka, R. Miyajima, Y. Ishida, S. Karasawa, T. Yoshimura, Glycyrrhizic acid is derived from the licorice root. The compound is amphiphilic with a large hydrophobic aglycone group, and two glucuronic acids and a carboxyl group constituting the hydrophilic part. Therefore, glycyrrhizic acid can form aggregates or lower the surface tension of aqueous solutions owing to its specific amphiphilic structure. The aqueous solubility of glycyrrhizic acid is relatively low (0.15 mM) and dependent on the solvent pH due to the weak acidity resulting from the carboxylic groups. Glycyrrhizic acid is quite soluble in a buffer solution at pH 4.5, and its ability to affect the surface tension of the buffer solution increases from pH 5. The critical micelle concentration (cmc) was estimated to be 2.9 mM (gamma(CMC) = 55.2 mN/m) and 5.3 mM (gamma(CMC) = 56.8 mN/m) at pH 5 and 6, respectively. The surface tension also decreased gradually at pH 7, but the critical point was not observed in the curve. At pH 7, the pyrene fluorescent probe method and light scattering measurements did not show a clear cmc. Small angle X-ray scattering experiments revealed that the aggregates were rod-like micelles with an estimated radius and length of 1.5 nm and 21 nm, respectively, at 5 mM in a pH 5 solvent. Transmission electron microscopy confirmed that glycyrrhizic acid forms rod-like micelles. These results suggest that glycyrrhizic acid has potential applications as a biosurfactant in various fields. (C) 2016 Elsevier B.V. All rights reserved., 05 Jul. 2016, 500, 112, 117, Scientific journal, 10.1016/j.colsurfa.2016.04.032
  • Refereed, Colloids Surf., A, ELSEVIER SCIENCE BV, Structural Study on Aggregation Behavior of Star-type Trimeric Surfactant in the presence of sodium salicylate, T. Kusano, K. Akutsu, H. Iwase, T. Yoshimura, M. Shibayama, We investigated the aggregation behavior of star-type trimeric surfactants (3C(12)trisQ) with a hydrocarbon chain length (n) of 12 in sodium salicylate (NaSal) aqueous solution at various surfactant (C-D) and salt concentrations (C-S) using small-angle X-ray scattering (SAXS) and rheological measurements. At a low surfactant concentration (C-D = 7 mM), 3C(12)trisQ aggregates in solution evolved from ellipsoidal micelles, to rodlike or wormlike micelles and finally to multi-lamellar vesicles (MLVs) with increasing C-S. In contrast, at higher surfactant concentrations (C-D =14 and 28 mM), we did not observe vesicle formations of 3C(12)trisQ because 3C(12)trisQ were insoluble in solution at higher NaSal concentrations. The structural transitions of the 3C(12)trisQ aggregates strongly depended on both C-S and C-D. We also compared the MLV structure formed by 3C(12)trisQ with that formed by gemini-type surfactants (12-2-12). The repeat distance of the 3C(12)trisQ MLV (33.95 angstrom) was remarkably larger than that of the 12-2-12 (22.36 angstrom). We found that introducing spacer chains, i.e., from dimeric to trimeric surfactants, caused a decrease in NaSal concentrations at which micelle-to-vesicle transitions were observed. (C) 2016 Elsevier B.V. All rights reserved., 20 May 2016, 497, 109, 116, Scientific journal, 10.1016/j.colsurfa.2016.02.041
  • Refereed, J. Oleo Sci., JAPAN OIL CHEMISTS SOC, Solution Properties of Dissymmetric Sulfonate-type Anionic Gemini Surfactants, T. Yoshimura, K. Akiba, Dissymmetric and symmetric anionic gemini surfactants, N-alkyl-N'-alkyl-N,N'dipropanesulfonylethylenediamine (C,CSul, where in and n represent alkyl chain lengths of m-n = 4-16, 6-14, 8-12, 10-10, and 12-12), were synthesized by two-or three-step reactions. Their physicochemical properties were characterized by equilibrium surface tension measurements, steady-state fluorescence spectroscopy of pyrene, and dynamic light scattering. The critical micelle concentration (CMC) of the dissymmetric surfactants C(4)C(16)Sul, C(6)C(14)Sul, and C(8)C(12)Sul was slightly lower than that of the symmetric surfactant C C(1)C(10)Sul. The occupied area per molecule (A) of C(8)C(12)Sul was smaller than that of C(10)C(10)Sul, indicating that C(8)C(12)Sul has a high surface activity. However, the increase in the degree of dissymmetry from C(8)C(12)Sul to C(6)C(14)Sul and then to C(4)C(16)Sul resulted in high surface tension and large A. Based on the surface tension, the standard free energies of micellization (Delta G degrees (mic)) and adsorption (Delta G degrees (ads)), the efficiency of surface adsorption (pC), and the effectiveness of surface adsorption (CMC/C-20) were obtained. These parameters suggested that C(8)C(12)Sul formed micelles more readily than the other surfactants. The properties determined from the surface tension indicated that C(8)C(12)Sul's ability is intermediate between those of C(10)C(10)Sul and C(12)C(12)Sul. The pyrene fluorescence and dynamic light scattering results revealed that the micelle size depends on the longer of the two alkyl chains in dissymmetric surfactants., 01 Feb. 2016, 65, 2, 135, 141, Scientific journal, 10.5650/jos.ess15237
  • Refereed, Colloids Surf., A, ELSEVIER SCIENCE BV, Solubilization of Naphthalene and Octafluoronaphthalene in Ionic Hydrocarbon and Fluorocarbon Surfactants, K. Matsuoka, R. Yamashita, M. Ichinose, M. Kondo, T. Yoshimura, The solubilization abilities of various kinds of surfactants are clarified through a systematic solubilization study. Naphthalene and octafluoronaphthalene have similar molecular structures and can be used as solubilizates in hydrocarbon and fluorocarbon surfactant systems. The solubilizaton quantities are measured for typical anionic, cationic, and cationic gemini surfactants with different alkyl chain lengths (nine hydrocarbon and six fluorocarbon surfactants). The maximum solubilization quantities of naphthalene and octafluoronaphthalene in aqueous solutions of hydrocarbon or fluorocarbon surfactant are measured as a function of surfactant concentration at 318.2 K. There are four solubilization systems regarding hydrocarbons and fluorocarbons. Judging from the molar solubilization ratio (MSR), naphthalene is solubilized most in typical gemini surfactant solution (12-2-12), whereas hardly any naphthalene is solubilized in fluorocarbon surfactants. On the other hand, the maximum MSR of octafluoronaphthalene is found for the gemini type of fluorocarbon surfactant, whereas the minimum value is recorded in the C9H19COONa system. Therefore, gemini surfactants reveal excellent solubilization abilities in homogeneous combination systems. The solubilization stability can be analyzed by estimating the Gibbs free energy change (Delta G degrees) for the transfer of solubilizate molecules to the aggregate phase. The largest negative value of Delta G degrees is estimated to be -34.8 kJ mol(-1) for the homogeneous system of octafluoronaphthalene and the gemini-type fluorocarbon surfactant, whereas smaller values are obtained for the heterogeneous systems of naphthalene and fluorocarbon surfactants. These results indicate that fluorocarbon surfactants are not generally suitable for the solubilization of naphthalene. (C) 2014 Elsevier B.V. All rights reserved., 20 Aug. 2014, 456, 83, 91, Scientific journal, 10.1016/j.colsurfa.2014.04.060
  • Refereed, 色材協会誌, 高性能化・高機能化を目指した両親媒性デンドリマーの開発(解説), 吉村倫一, 20 May 2014, 87, 5, 158, 164, Scientific journal
  • Refereed, 顕微鏡, 日本顕微鏡学会, Observation of Nano-Structure of Surfactant Micelle by Cryogenic Electron Microscopy, 吉村倫一,小川哲也, May 2014, 49, 1, 22, 25, Scientific journal
  • Refereed, Fragrance journal, フレグランスジャーナル社, Development of emulsion by lactic-acid-bacteria fermented rice as novel natural functional material, 吉村倫一,羽田容介,澤木茂豊, May 2014, 42, 5, 41, 45, Scientific journal
  • Refereed, JOURNAL OF OLEO SCIENCE, JAPAN OIL CHEMISTS SOC, Adsorption and Aggregation Properties of Multichain Anionic Amphiphilic Oligomers Consisting of Dodecyl Acrylamide and Sodium Acrylate, Tomokazu Yoshimura; Hiroaki Yoshida; Kunio Esumi, Multichain amide-bonded anionic amphiphilic oligomers consisting of dodecyl acrylamide and sodium acrylate (i.e., xC(12)AAm-yAA, where x and y represent the number of dodecyl acrylamide (C(12)AAm) and sodium acrylate (AA) units, respectively) were synthesized via the radical oligomerization of two monomers in the presence of 2-aminoethanethiol hydrochloride. Equilibrium and dynamic surface tension, pyrene fluorescence, dynamic light scattering, and steady-state fluorescence quenching measurements were used to characterize the properties of the oligomers. In addition, the effects of the polymerization degree and number of dodecyl chains and hydrophilic groups on these properties were evaluated via comparison of these results with those of previously reported amphiphilic oligomers with ester bonds and conventional anionic monomeric surfactants. xC(12)AAm-yAA exhibits lower critical micelle concentration (cmc) values than conventional sodium n-dodecanoate surfactant, indicating their excellent micelle-forming ability despite the large molecular structure with a long polymer main chain. The 3.0C(12)AAm-7.5AA oligomer features the lowest cmc. The surface tensions of xC(12)AAm-yAA at the cmc are lower than those of the conventional surfactant, which indicates that the oligomers adsorb and orient efficiently at the air-water interface. Further, xC(12)AAm-yAA forms small aggregates with diameters of similar to 10 nm and aggregation numbers of 2-8 as well as large aggregates composed of masses of small aggregates. An increase in the polymerization degree of the oligomers decreases the aggregation number of the small aggregates; this indicates that it is more difficult for oligomers with long polymer chains to form aggregates due to their bulky structure., Sep. 2013, 62, 9, 673, 680, Scientific journal, 10.5650/jos.62.673
  • Refereed, J. Oleo Sci., Japan Oil Chemists' Society, Solution Properties of Amphiphilic Telomers with Multiple Sugar Chains and Terminal Alkyl Chain, YOSHIMURA Tomokazu; T.Yoshimura; R.Ohori; K.Esumi, Amphiphilic telomers with multiple sugar chains and a terminal undecyl or heptadecyl chain (i.e., CnAm-mGEMA, where n and m represent alkyl chain lengths of 11 or 17 with a degree of polymerization of 2.0 or 3.0 for glucosyloxyethyl methacrylate (GEMA) units, respectively) were synthesized via monomeric radical telomerization in the presence of 2-aminoethanethiol hydrochloride. Surface tension, pyrene fluorescence, and dynamic light scattering were measured to characterize the solution properties of the synthesized telomers. In addition, the effects of alkyl chain length and degree of polymerization of hydrophilic GEMA units on the measured properties were evaluated by comparison with those of conventional polyoxyethylene dodecyl ether nonionic surfactants. CnAm-mGEMA telomers exhibited higher critical micelle concentration (CMC) values than polyoxyethylene dodecyl ether surfactants with similar number of hydrophilic groups did. The synthesized telomers are highly efficient in reducing the surface tension of water, despite the relatively large hydrophilic structures within the sugar units (GEMA). A unique behavior was observed in that adsorption at the air-water interface and solution aggregation occurred simultaneously at a concentration below CMC (as determined by the surface tension method). This suggests that aggregate formation occurs readily in solution along with the adsorption at the interface because of strong attractive interactions between multiple sugar GEMA chains. Further, aggregates formed by CnAm-mGEMA telomers differ depending on the number of sugar chains, i.e., an increase in the degree of polymerization of the telomers increases the size of the aggregates. This indicates that it is easier for telomers with more sugar GEMA chains to form large aggregates due to the interactions between their hydroxyl groups., Aug. 2013, 62, 8, 571-577, 577, 10.5650/jos.62.571
  • Refereed, JOURNAL OF OLEO SCIENCE, JAPAN OIL CHEMISTS SOC, Solution Properties and Emulsification Properties of Amino Acid-Based Gemini Surfactants Derived from Cysteine, Tomokazu Yoshimura; Ayako Sakato; Kunio Esumi, Amino acid-based anionic gemini surfactants (2C(n)diCys, where n represents an alkyl chain with a length of 10, 12, or 14 carbons and "di" and "Cys" indicate adipoyl and cysteine, respectively) were synthesized using the amino acid cysteine. Biodegradability, equilibrium surface tension, and dynamic light scattering were used to characterize the properties of gemini surfactants. Additionally, the effects of alkyl chain length, number of chains, and structure on these properties were evaluated by comparing previously reported gemini surfactants derived from cystine (2C(n)Cys) and monomeric surfactants (C(n)Cys). 2C(n)diCys shows relatively higher biodegradability than does C(n)Cys and previously reported sugar-based gemini surfactants. Both critical micelle concentration (CMC) and surface tension decrease when alkyl chain length is increased from 10 to 12, while a further increase in chain length to 14 results in increased CMC and surface tension. This indicates that long-chain gemini surfactants have a decreased aggregation tendency due to the steric hindrance of the bulky spacer as well as premicelle formation at concentrations below the CMC and are poorly packed at the air/water interface. Formation of micelles (measuring 2 to 5 nm in solution) from 2C(n)diCys shows no dependence on alkyl chain length. Further, shaking the mixtures of aqueous 2C(n)diCys surfactant solutions and squalane results in the formation of oil-in-water type emulsions. The highly stable emulsions are formed using 2C(12)diCys or 2C(14)diCys solution and squalane in a 1:1 or 2:1 volume ratio., Aug. 2013, 62, 8, 579, 586, Scientific journal, 10.5650/jos.62.579
  • Refereed, JOURNAL OF OLEO SCIENCE, JAPAN OIL CHEMISTS SOC, Equilibrium Surface Tension, Dynamic Surface Tension, and Micellization Properties of Lactobionamide-Type Sugar-Based. Gemini Surfactants, Tomokazu Yoshimura; Shin Umezawa; Akihiko Fujino; Kanjiro Torigoe; Kenichi Sakai; Hideki Sakai; Masahiko Abe; Kunio Esumi, A sugar-based gemini surfactant N,N'-dialkyl-N,N'-dilactobionamideethylenediamine (2C(n)Lac, where n represents alkyl chain lengths of 8, 10, 12, and 14) was synthesized by reacting N,N'-dialkylethylenediamine with lactobionic acid. The adsorption properties of 2C(n)Lac were characterized by equilibrium and dynamic surface tension measurements. Their micellization properties were investigated by steady-state fluorescence using pyrene as a probe and dynamic light scattering (DLS) techniques. The dependence of these properties on the alkyl chain length and the number of sugars was determined through a comparison with the corresponding monomeric surfactants C(n)MLA and previously reported sugar-based gemini surfactants containing monosaccharide gluconamide or disaccharide lactobionamide groups with a hexanediamide spacer. The critical micelle concentration (cmc) and surface tension of 2C(n)Lac are both lower than those of C(n)MLA surfactants. These lower values indicate that the synthesized sugar-based gemini surfactants have excellent micelle-forming ability in solution and high adsorption ability at the air-water interface, which result from strong interactions of the hydrogen bonds between the hydroxyls in lactobionamide groups. When the alkyl chain length of 2C(n)Lac increases to 14, premicellar formation occurs in the solution along with adsorption at the air-water interface at concentrations below the cmc. Furthermore, 2C(n)Lac forms micelles measuring 4 to 12 nm in solution, with no dependence on the alkyl chain length, and their size slightly increases with increasing concentration., Jun. 2013, 62, 6, 353, 362, Scientific journal, 10.5650/jos.62.353
  • Refereed, JOURNAL OF OLEO SCIENCE, JAPAN OIL CHEMISTS SOC, Solution Properties of Tadpole-type Cationic Amphiphilic Dendrimers Consisting of an Alkyl Chain, a Quaternary Ammonium, and a Poly(amidoamine) Dendron, Tomokazu Yoshimura; Masanori Saito; Kunio Esumi, Tadpole-type amphiphilic dendrimers consisting of an alkyl chain, a quaternary ammonium bromide (qb) and a poly(amidoamine) dendron (den) (C(n)qbdenGm, where n represents an alkyl chain with a length of 10,14, or 18 carbons; in is the generation number G of dendron taking the value - 0.5, 0.5, or 1.5) were synthesized using N,N-dimethylethylenediamine as a central scaffold. Electrical conductivity, surface tension, pyrene fluorescence, and dynamic light scattering measurements were used to characterize the properties of the dendrimers. In addition, the effect of the alkyl chain length and the generation number of a dendron on these properties was evaluated through a comparison with those of the corresponding previously reported amphiphilic dendrimers with lactobionamide sugar terminal groups (C(n)qbdenGmLac) and conventional cationic monomeric surfactants (C(n)TAB). Both critical micelle concentration (cmc) and surface tension (except for C-18 series) were lower than those of C(n)qbdenGmLac and C(n)TAB with the same alkyl chain length, indicating that the synthesized amphiphilic dendrimers have an excellent micelle-forming ability in solution and high adsorption ability at the air/water interface, in spite of the large bulky dendron structure. When the alkyl chain length and the generation number of the amphiphilic dendrimers were increased, the surface tension became high because of the curved long alkyl chain and the bulky structure of dendron. Further, C(n)qbdenGm formed micelles with a small size in solution, and the micelles of C(n)qbdenG(-0.5) had almost a constant size despite the changes in the concentration, while those of C(n)qbdenG0.5 and C(n)qbdenG1.5 became smaller with increasing concentration. The difference in the behavior results from the difference in the number of amide groups in the low- and high-generation dendrons., Apr. 2013, 62, 4, 213, 221, Scientific journal, 10.5650/jos.62.213
  • Refereed, JOURNAL OF OLEO SCIENCE, JAPAN OIL CHEMISTS SOC, Unique Solution Properties of Quaternized Oligomeric Surfactants Derived from Ethylenediamine or G0 Poly (amidoamine) Dendrimers, Tomokazu Yoshimura; Shunsuke Abe; Kunio Esumi, New quaternized oligomeric surfactants containing 4 or 8 alkyl chains were synthesized using ethylenediamine or poly(amidoamine) dendrimers as the central scaffold. Electrical conductivity, surface tension, and pyrene fluorescence measurements, as well as dynamic light scattering were used to characterize their properties. In addition, the dependence of these properties on the alkyl chain length, number of chains, and dendrimer generation was determined through comparison with previously reported oligomeric surfactants. The relation between surface tension and concentration for the oligomeric surfactants exhibited clear breakpoints, which reflect the critical micelle concentration (cmc). Both cmc and surface tension were lower than those of monomeric alkyltrimethylammonium bromide surfactants, indicating that the synthesized oligomeric surfactants have excellent micelle-forming ability in solution and high adsorption ability at the air/water interface, in spite of the large bulky structure containing multiple alkyl chains and headgroups within one molecule. When the alkyl chain length or the number of chains of the oligomeric surfactants was increased, a unique behavior was observed in that adsorption at the air/water interface and solution aggregation occurred simultaneously at a concentration below cmc (as determined by the surface tension method). This suggests that aggregate formation occurs readily in solution along with the adsorption at the interface because of strong attractive interactions between multiple alkyl chains., Dec. 2012, 61, 12, 699, 706, Scientific journal, 10.5650/jos.61.699
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Structural and Rheological Studies on Growth of Salt-Free Wormlike Micelles Formed by Star-Type Trimeric Surfactants, Takumi Kusano; Hiroki Iwase; Tomokazu Yoshimura; Mitsuhiro Shibayama, We investigated the growth mechanisms of wormlike micelles formed by star-type trimeric surfactant (3C(12)trisQ) with a hydrocarbon chain length of 12 in an aqueous solution. A 3C(n)trisQ molecule consists of three hydrocarbon chains and three hydrophilic groups connected by spacer chains, where n is the carbon number in the hydrocarbon chain. Our recent studies showed that the aggregates formed by 3C(12)trisQ exhibited sphere-to-rod transition and the growth of wormlike micelles in an aqueous solution in the absence of salt. We performed small-angle neutron scattering (SANS) and rheological measurements and investigated the aggregation behavior of 3C(12)trisQ with various surfactant volume fractions. All SANS profiles for the 3C(12)trisQ indicated peak-profiles in the q range of 0.02 angstrom(-1) < q <0.05 angstrom(-1), where the magnitude of the scattering vector q is defined by q = 4 pi sin(theta/2)/lambda (lambda and theta represent the wavelength and scattering angle, respectively). These peaks were attributed to repulsive interparticle interactions between the micelles. The volume fraction dependence of the SANS peak-position was in agreement with the rheological behavior. These results suggest that 3C(12)trisQ shows sphere-to-rod transition and can produce wormlike micelles in the absence of salt. To determine the structural parameters quantitatively, model-fitting analysis was performed using a charged cylindrical or charged ellipsoidal particle scattering function. The radius, length, and number of water molecules per surfactant molecule (n(w)) inside the micelles were evaluated. The length increased and the n(w), value decreased with increasing phi, indicating that the growth of a wormlike micelle accompanies the extrusion of water from the micelle. The end-cap energies of star-type trimeric, gemini, and monomeric surfactants were evaluated from phi dependence of zero-shear viscosity. We found that wormlike micelles formed by 3C(12)trisQ exhibited a higher end-cap energy than gemini surfactant., Dec. 2012, 28, 49, 16798, 16806, Scientific journal, 10.1021/la304275h
  • Refereed, The Pigments,Paints and Printing Inks, Japan Society of Colour Material, 第四級アンモニウム塩を有するトリメリック型カチオン界面活性剤(総説), YOSHIMURA Tomokazu, Recently, we pay attention to trimeric surfactants with three alkyl chains and three quaternary ammonium headgroups in a molecule, and have been researching. Only a few reports are available with regard to research on trimeric surfactants. This review describes design and synthesis, properties such as critical micelle concentration and surface tension, etc., and nanostructures of micelles formed in aqueous solution for star-type cationic trimeric surfactants with tris(2-aminoethyl)amine in spacer and linear-type cationic trimeric surfactants with flexible spacers such as ethylene and propylene, and rigid spacers such as trans-butenylene and m- and p-xylylene., Sep. 2012, 85, 9, 370-377, 377, 10.4011/shikizai.85.370
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Star-Shaped Trimeric Quaternary Ammonium Bromide Surfactants: Adsorption and Aggregation Properties, Tomokazu Yoshimura; Takumi Kusano; Hiroki Iwase; Mitsuhiro Shibayama; Tetsuya Ogawa; Hiroki Kurata, Novel star-shaped trimeric surfactants consisting of three quaternary ammonium surfactants linked to a tris(2-aminoethyl)amine core were synthesized. Each ammonium had two methyls and a straight alkyl chain of 8, 10, 12, or 14 carbons. The adsorption and aggregation properties of these tris(N-alkyl-N,N-dimethyl-2-ammoniumethyl)amine bromides (3C(n)trisQ, in which n represents alkyl chain carbon number) were characterized by equilibrium and dynamic surface tension, rheology, small-angle neutron scattering (SANS), and cryogenic transmission electron microscopy (cryo-TEM) techniques. 3C(n)trisQ showed critical micelle concentrations (CMC) 1 order of magnitude lower than that of the corresponding gemini surfactants with an ethylene spacer and the corresponding monomeric surfactants. The logarithm of the CMC decreased linearly with increasing hydrocarbon chain length for 3C(n)trisQ The slope of the line, which is well-known as Klevens equation, was larger than those of the monomeric and gemini surfactants; however, considering the total carbon number in the chains, the slope was shallower than the monomeric and was close to the gemini. Through the results such as surface tensions at the CMC (32-34 mN m(-1)) and the parameters of standard free energy, CMC/C-20 and pC(20), it was found that 3C(n)trisQ could adsorb densely at the air/water interface despite the strong electrostatic repulsion between multiple quaternary ammonium headgroups. Moreover, dynamic surface tension measurements showed that the kinetics of adsorption for 3C(n)trisQ to the air/water interface was slow because of their bulky structures. Furthermore, the results of rheology, SANS, and cryo-TEM determined that 3C(n)trisQ with n = 10 and 12 formed ellipsoidal micelles at low concentrations in solution and the structures transformed to threadlike micelles with very few branches for n = 12 as the concentration increased, but for n = 14 threadlike micelles formed at relatively low concentrations., Jun. 2012, 28, 25, 9322, 9331, Scientific journal, 10.1021/la301220y
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Supra-long chain surfactants with double or triple quaternary ammonium headgroups, Tomokazu Yoshimura; Nagisa Chiba; Keisuke Matsuoka, Novel supra-long chain surfactants with double or triple quaternary ammonium salts (C-n-2Am, C-n-3Am, in which n represents a hydrocarbon chain length of 18, 20, and 22) were synthesized, and electrical conductivity and surface tension were used to characterize their properties depending on both the hydrocarbon chain length and number of hydrophilic groups. The Krafft temperatures decreased remarkably with an increase in the quaternary ammonium headgroups, resulting in a high solubility in water. The critical micelle concentration (cmc) increased with an increase in the number of quaternary ammonium moieties in the hydrophilic group, and the difference in the cmc was smaller for C-n-2Am and C-n-3Am than for C-n-2Am and C-n-Am of alkyltrimethylammonium bromide. The surface tension at the cmc was approximately 45 and 48 mN m(-1) for C-n-2Am and C-n-3Am with n = 18-22, respectively. This indicated that the supra-long chain surfactants could not efficiently adsorb at the air/water interface and orient by themselves, as is known for conventional surfactants. (C) 2012 Elsevier Inc. All rights reserved., May 2012, 374, 1, 157, 163, Scientific journal, 10.1016/j.jcis.2012.01.033
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Zwitterionic heterogemini surfactants containing ammonium and carboxylate headgroups 2: Aggregation behavior studied by SANS, DLS, and cryo-TEM, Kanae Nyuta; Tomokazu Yoshimura; Koji Tsuchiya; Hideki Sakai; Masahiko Abe; Hiroki Iwase, The aggregation behavior in aqueous solution of zwitterionic heterogemini surfactants, N,N-dimethyl-N-[2-(N'-alkyl-N'-beta-carboxypropanoylamino)ethyl]-1-alkylammonium bromides (2C(n)AmCa, in which n represents hydrocarbon chain lengths of 8, 10, 12, and 14), with nonidentical headgroups containing ammonium and carboxylate was investigated through small-angle neutron scattering (SANS), dynamic light scattering (DLS), and cryogenic transmission electron microscopy (cryo-TEM) techniques. We found that the aggregation behavior of 2C(n)AmCa strongly depended on the hydrocarbon chain length and the surfactant concentration. 2C(8)AmCa forms spherical micelles with radius of approximately 2 nm in solution. 2C(10)AmCa forms rod-like micelles at low concentration in the solution, and the structure changes to vesicles with increasing concentration. The membrane thickness of the vesicle is independent of the surfactant concentration. Aggregation shape transitions were also observed for 2C(12)AmCa. In addition, it appears that the vesicles of 2C(12)AmCa coexist with the rod-like micelles at a wide range of surfactant concentrations. Interestingly, 2C(14)AmCa forms vesicles with averaged membrane thickness of 2.32 nm in solution, even at the extremely low concentration of 10 times the cmc. Thus, it was concluded that 2C(n)AmCa exhibits unique aggregation behavior, such as the formation of spherical micelle -> rod-like micelle -> rod-like micelle + vesicle (coexistence) -> vesicle with increasing hydrocarbon chain length and surfactant concentration. We also found that the membrane structure is an interdigitated bilayer when the vesicles are formed. This formation of interdigitated structures is related to the origins of the effective properties of 2C(n)AmCa in solution. (C) 2011 Elsevier Inc. All rights reserved., Mar. 2012, 370, 1, 80, 85, Scientific journal, 10.1016/j.jcis.2011.12.027
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Effect of double quaternary ammonium groups on micelle formation of partially fluorinated surfactant, Keisuke Matsuoka; Nagisa Chiba; Tomokazu Yoshimura; Emi Takeuchi, To investigate the effect of divalency on the micelle properties, we synthesized divalent cationic surfactants composed of fluorocarbons and double quaternary ammonium groups N,N-dimethyl-N-[2-(N'-trimethylammonium)ethyl]-1-(3-perfluoroalkyl-2-hydroxypropyl) ammonium bromide [C(n)(F)C(3)-2Am; where n (=8 or 10) represents the number of carbon atoms in the fluorocarbon chain]. The double quaternary ammonium groups are continuously combined by the ethylene spacer in the surfactant head group, which clearly distinguishes the molecular design of the surfactant from those of the other typical divalent surfactants, bolaform and gemini types. The presence of the divalent head group results in an advantageous increase in their solubility [i.e., rise in the critical micelle concentration (cmc)]; however, the extra electrostatic repulsion between divalent cations decreases the surface activity in comparison with monovalent homologous fluorinated surfactants. The cmc, surface tension at cmc, and area occupied by a surfactant molecule in aqueous solution at 298.2 K are 4.32 mM, 30.6 mN m(-1), and 0.648 nm(2) molecule(-1), respectively, for C(8)(F)C(3)-2Am, and 1.51 mM, 30.4 mN m(-1), and 0.817 nm(2) molecule(-1), respectively, for C(10)(F)C(3)-2Am. The micellar size and shape were investigated by dynamic light scattering and freeze-fracture transmission electron microscopy (TEM). The TEM micrographs show that C(n)(F)C(3)-2Am (n = 8 and 10) mainly forms ellipsoidal micelles approximately 10-100 nm in size for n = 8 and approximately 10-20 nm in size for n = 10. The degree of counterion binding to micelle was determined by selective electrode potential measurements, and the results of 0.7-0.8 agree with the average values for conventional monovalent ionic surfactants. (C) 2011 Elsevier Inc. All rights reserved., Apr. 2011, 356, 2, 624, 629, Scientific journal, 10.1016/j.jcis.2011.01.030
  • Refereed, 色材協会誌, ヘテロジェミニ型界面活性剤の界面物性と会合挙動(特集・総説), YOSHIMURA Tomokazu, Dec. 2009, 82, 12, 568-575
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Surface properties and aggregate morphology of partially fluorinated carboxylate-type anionic gemini surfactants, Tomokazu Yoshimura; Miri Bong; Keisuke Matsuoka; Chikako Honda; Kazutoyo Endo, Three anionic homologues of a novel partially fluorinated carboxylate-type anionic gemini surfactant, N, N'-di(3-perfluoroalkyl-2-hydroxypropyl)-N, N'-diacetic acid ethylenediamine (2C(n)(F) edda, where n represents the number of carbon atoms in the fluorocarbon chain (4, 6, and 8)) were synthesized. In these present gemini surfactants, the relatively small carboxylic acid moieties form hydrophilic head groups. The surface properties or structures of the aggregates of these surfactants are strongly influenced by the non-flexible fluorocarbons and small head groups; this is because these surfactants have a closely packed molecular structure. The equilibrium surface tension properties of these surfactants were measured at 298.2 K for various fluorocarbon chain lengths. The plot of the logarithm of the critical micelle concentration (cmc) against the fluorocarbon chain lengths for 2C(n)(F) edda (n = 4, 6, and 8) showed a minimum for n = 6. Furthermore, the lowest surface tension of 2C(6)(F) edda at the cmc was 16.4 mN m (1). Such unique behavior has not been observed even in the other fluorinated surfactants. Changes in the shapes and sizes of these surfactant aggregate with concentration were investigated by dynamic light scattering and transmission electron microscopy (TEM). The TEM micrographs showed that in an aqueous alkali solution, 2C(n)(F) edda mainly formed aggregates with stringlike (n = 4), cagelike (n = 6), and distorted bilayer structures (n = 8). The morphological changes in the aggregates were affected by the molecular structure composed of nonflexible fluorocarbon chains and flexible hydrocarbon chains. (C) 2009 Elsevier Inc. All rights reserved., Nov. 2009, 339, 1, 230, 235, Scientific journal, 10.1016/j.jcis.2009.07.054
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Fluorocarbon-hydrocarbon gemini surfactant mixtures in aqueous solution, Kenichi Sakai; Megumi Kaji; Yuichiro Takamatsu; Koji Tsuchiya; Kanjiro Torigoe; Kazuyuki Tsubone; Tomokazu Yoshimura; Kunio Esumi; Hideki Sakai; Masahiko Abe, The aqueous solution properties of oppositely charged gemini-gemini surfactant mixtures have been studied with a combination of static surface tension, dynamic light scattering (DLS) and cryogenic transmission electron microscope (cryo-TEM) measurements. Two gemini surfactants were employed in this study: one is a partially fluorinated cationic gemini surfactant, 1,2-bis[dimethyl-(3-perfluorohexyl-2-hydroxypropyl)ammonium]ethane dibromide, and the other is a novel anionic gemini surfactant having hydrocarbon tail groups (N,N'-didodecyl-N,N'-dipropanesulfonylethylenediamine). Synergistic surfactant mixtures are frequently exploited to lower the mixed critical micelle concentration (cmc), however. such a decrease in the cmc is not observed in the current study. This suggests that limited mutual miscibility between the fluorocarbon and hydrocarbon tail groups plays a key role for the formation of the adsorbed layer, rather than attractive interactions such as electrostatic forces. On the other hand, spontaneous formation of vesicle-like molecular aggregates is suggested to occur as a result of their synergistic interaction in bulk solution. (C) 2008 Elsevier B.V. All rights reserved., Feb. 2009, 333, 1-3, 26, 31, Scientific journal, 10.1016/j.colsurfa.2008.09.022
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Adsorption characteristics of sugar-based monomeric and gemini surfactants at the silica/aqueous solution interface, Kenichi Sakai; Mamoru Tamura; Shin Umezawa; Yuichiro Takamatsu; Kanjiro Torigoe; Tomokazu Yoshimura; Kunio Esumi; Hideki Sakai; Masahiko Abe, The adsorption behavior of sugar-based surfactants at the silica/aqueous solution interface has been characterized on the basis of the adsorption isotherm, potential and in situ atomic force microscopy (AFM) data. The surfactants used in the current work are monomeric Glu(n) (N-alkyl-N-methylgluconamide) and gemini Glu(n)-2-Glu(n) (N,N'-dialkyl-N,N'-digluconamide ethylenediamine), where n is the hydrocarbon chain length of 10 and 12. The adsorption isotherm reveals that, for all the surfactants, the adsorbed amount increases even above the critical micelle concentration (cmc) and an adsorption plateau region appears at the equilibrium concentration well above the cmc. The driving force for this adsorption is deemed to be a combination of the hydrogen bonding between the sugar moieties and the surface silanol groups and the intermolecular hydrophobic interaction of free monomers to the surfactants pre-adsorbed on silica. in the adsorption plateau region, the occupied area per molecule adsorbed on silica is calculated to be generally larger for the gemini surfactants than for the monomeric ones. This reflects the bulky structure of the headgroups of the sugar-based gemini surfactants and/or the relatively less favorable interaction of the headgroups with the silica surface. The combination of the soft-contact AFM and force curve data suggests that a structural transformation of the adsorbed layer occurs with an increase in the surfactant concentration, depending on the packing parameter of each surfactant. At the concentration above the cmc, the monomeric surfactants form either worm-like surface micelles or a patchy bilayer whereas the gemini surfactants only form a patchy bilayer. (C) 2008 Elsevier B.V. All rights reserved., Oct. 2008, 328, 1-3, 100, 106, Scientific journal, 10.1016/j.colsurfa.2008.06.033
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Synthesis and aqueous solution properties of PAMAM dendron surfactants bearing a quaternary ammonium focal group and sugar terminal groups, Kanjiro Torigoe; Akihoko Tasaki; Tomokazu Yoshimura; Kenichi Sakai; Kunio Esurni; Yuichiro Takamatsu; Suraj Chandra Sharma; Hideki Sakai; Masahiko Abe, Poly(amidoamine) (PAMAM) dendron surfactants bearing a focal quaternary alkyldimethylammonium group and terminal sugar groups (C(m)qb-GnLac: m = 12, 18, 22; n = 0, 1) have been synthesized. Solution properties of these dendron surfactants were investigated by means of static surface tension, electric conductivity, fluorescence probing with pyrene, dynamic light scattering (DLS) and static light scattering (SLS). In the surface tension profiles all C(m)qb-GnLac systems indicate a clear break point corresponding to the critical micelle concentration (cmc). The cmc decreases with increasing length of alkyl chain, from 8.2 x 10(-3) (C-12) to 4.5 x 10(-6) mol dm(-3) (C-22) for G0Lac, from 1.0 X 10(-2) (C-12) to 3.7 x 10(-5) mol dm(-1) (C-22) for G I Lac systems. Unlike conventional cationic surfactants, the surface tension at cmc (gamma(cmc)) significantly increases with increasing alkyl chain length, associated with a slight increase in the molecular occupied area. Degree of counter ion (Br-) binding to the micelles is found to be very low due to an effective charge shielding by bulky non-ionic headgroups. In all C(m)qb-GnLac systems the micellar size decreases above a certain concentration. In the higher concentration regime, formation of micelles with a very small number of (at most a few) molecules is suggested from DLS data. (c) 2008 Elsevier B.V. All rights reserved., Sep. 2008, 326, 3, 184, 190, Scientific journal, 10.1016/j.colsurfa.2008.05.036
  • Refereed, JOURNAL OF OLEO SCIENCE, JAPAN OIL CHEMISTS SOC, Adsorption of Cationic Monomeric and Gemini Surfactants on Montmorillonite and Adsolubilization of Vitamin E, Kenichi Sakai; Erimi Nakajima; Yuichiro Takamatsu; Suraj C. Sharma; Kanjiro Torigoe; Tomokazu Yoshimura; Kunio Esumi; Hideki Sakai; Masahiko Abe, Adsorption of a cationic gemini surfactant (1,2-bis(dodecyidimethylammonio) ethane dibromide, 12-2-12) and the corresponding monomeric surfactant (dodecyltrimethylammonium bromide, DTAB) on montmorillonite has been characterized with a combination of adsorption isotherm, interlayer spacing and FT-IR spectroscopic data. Adsolubilization of vitamin E into the adsorbed surfactant layers has also been studied. The adsorption isotherm data reveal that the adsorption of the two surfactants is driven by the two factors: one is the cation exchange that occurs on the interlayer basal planes and the other is the hydrophobic interaction between hydrocarbon chains of the surfactants. Although the adsorbed amount measured in the saturation region (in mol g(-1)) is almost identical for the two surfactants, the conformation of the intercalated surfactant molecules differs significantly from each other. The adsorption of DTAB results in a lateral bilayer arrangement in the limited interlayer space, whereas 12-2-12 gives a normal bilayer arrangement in the expanded interlayer space. Adsolubilization of vitamin E takes place into the adsorbed surfactant layers, and interestingly, all the vitamin E molecules added in the montmorillonite suspensions are hybridized at lower surfactant concentrations due to the great specific surface area of the clay material. Since the maximum adsolubilization amount is usually obtained just below the critical micelle concentration, the gemini surfactant is deemed to be more efficient than the corresponding monomeric one to achieve the great adsolubilization amount., Aug. 2008, 57, 8, 423, 429, Scientific journal, 10.5650/jos.57.423
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Nanocage aggregates composed of bilayer sheets, Keisuke Matsuoka; Tomokazu Yoshimura; Miri Bong; Chikako Honda; Kazutoyo Endo, A partially fluorinated carboxylate-type anionic gemini surfactant, N,N'-di(3-perfluorohexyl-2-hydroxypropyl)-N,N'-diacetic acid-ethylenediamine (2C(6)(F)edda), formed aggregates with a cagelike structure in an aqueous alkali solution. These aggregates were composed of several bilayer sheets. The TEM micrograph showed that the bilayer sheets were produced from a condensed self-assembly core. The leaflike bilayer sheets-can form folds and link to each other at their edges. The typical size of the spherical cage ranged from ca. 200 to 1500 nm., Jun. 2008, 24, 11, 5676, 5678, Scientific journal, 10.1021/la800618v
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Adsorption and micellization behavior of novel gluconamide-type gemini surfactants, Kenichi Sakai; Shin Umezawa; Mamoru Tamura; Yuichiro Takamatsu; Koji Tsuchiya; Kanjiro Torigoe; Takahiro Ohkubo; Tomokazu Yoshimura; Kunio Esumi; Hideki Sakai; Masahiko Abe, The adsorption and micellization behavior of novel sugar-based gemini surfactants (N,N'-dialkyl-N,N'-digluconamide ethylenediamine, Glu(n)-2-Glu(n), where n is the hydrocarbon chain length of 8, 10 and 12) has been studied on the basis of static/dynamic surface tension, fluorescence, dynamic light scattering (DLS) and cryogenic transmission electron microscope (cryo-TEM) data. The static surface tension of the aqueous Glu(n)-2-Glu(n) solutions measured at the critical micelle concentration (cmc) is observed to be significantly lower than that of the corresponding monomeric surfactants. This suggests that the gemini surfactants, newly synthesized in the current study, are able to form a closely packed monolayer film at the air/aqueous solution interface. The greater ability in the molecular association is supported by the remarkably (approximately 100-200 times) lower cmc of the gemini surfactants compared with the corresponding monomeric ones. With a combination of the fluorescence and DLS data, a structural transformation of the Glu(n)-2-Glu(n) micelles is suggested to occur with an increase in the concentration. The cryo-TEM measurements clearly confirm the formation of worm-like micelles of Glu(12)-2-Glu(12) at the concentration well above the cmc. (C) 2007 Elsevier Inc. All rights reserved., Feb. 2008, 318, 2, 440, 448, Scientific journal, 10.1016/j.jcis.2007.10.039
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Interaction Forces between BSA Adsorbed Layer on Amino-Thiolated Gold Surfaces, YOSHIMURA Tomokazu; D.Hiraiwa; K.Torigoe; T.Yoshimura; K.Esumi, Direct measurement of interaction forces between bovine serum albumin (BSA) adsorbed layers on amino-thiolated gold surfaces has been carried out using colloidal probe atomic force microscopy (AFM). The substrate was prepared via self-assembly of 2-aminoethanethiol on gold in aqueous media. In the absence of BSA, an electric double layer interaction was observed, resulting from protonation of the primary amine groups on the gold surface. Similar electric double layer repulsions were seen in the presence of BSA over a whole range of BSA concentration investigated. These repulsive interactions were found to be dependent on the BSA concentration, that is, the magnitude of the repulsion increases with the BSA concentration. This phenomenon is attributed to the difference in the adsorbed amount of BSA on the amino-thiolated gold surface, which was confirmed using a 27 MHz quartz crystal microbalance (QCM)., Jan. 2008, 81, 1, 2-9, 9, 10.4011/shikizai.81.2
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Molecular aggregates of partially fluorinated quaternary ammonium salt gemini surfactants, Keisuke Matsuoka; Tomokazu Yoshimura; Takashi Shikimoto; Juri Hamada; Mika Yamawaki; Chikako Honda; Kazutoyo Endo, The size and shape of novel partially fluorinated gemini surfactant 1,2-bis[dimethyl-(3-perfluoroalkyl-2F hydroxypropyl) ammonium] ethane bromide ((CnC3)-C-F-2-C3CnF, where n = 4, 6, and 8) were investigated in aqueous solution by means of light scattering and transmission electron microscopy (TEM). The sizes of these molecular aggregates changed with increasing carbon number of the alkyl chain and concentration. For example, the apparent hydrodynamic radius by dynamic light scattering was 18 nm at a concentration of cmc x 5 for n = 4, 115 urn at the cmc x 15 for it = 6, and 62 nm at the cmc x 30 for it = 8, at 298.2 K. The shapes of C-n(F) C-3-2-C3 C-n(F) aggregates drastically changed with the alkyl chain length; the aggregates were mainly in the form of large or irregular small auureaates (n = 4), string-like aggregates (n = 6), and vesicles (n = 8). The bromide-ion activity was measured using a bromide-ion-selective electrode to determine the degree of counterion binding to the aggregates. The degree of counterion binding to aggregate was very small compared with that in the typical hydrogenated gemini surfactants. These results indicated that the small curvature of large aggregates was not influenced by an electrostatic repulsion between the cationic head groups in the case of the bulky molecular volume of fluorinated gemini surfactants., Oct. 2007, 23, 22, 10990, 10994, Scientific journal, 10.1021/la701525c
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Adsorption and aggregation properties of amino acid-based N-alkyl cysteine monomeric and N,N '-dialkyl cystine gemini surfactants, Tomokazu Yoshimura; Ayako Sakato; Koji Tsuchiya; Takahiro Ohkubo; Hideki Sakai; Masahiko Abe; Kunio Esumi, An amino acid-based gemini surfactant derived from cystine (2C(n)Cys, where n represents the hydrocarbon chain lengths of 8, 10, and 12) was synthesized by reacting cystine with n-alkyl bromide, and its adsorption and aggregation properties were characterized by measurements of equilibrium and dynamic surface tension and dynamic light scattering. The properties of 2CnCys were compared with those of an amino acid-based monomeric surfactant derived from cysteine (C(n)Cys). For n = 8 and 10, when compared to C(n)Cys, 2C(n)Cys exhibited excellent surface activities, such as a lower critical micelle concentration (cmc), greater efficiency in lowering the surface tension of water, and smaller area occupied per molecule. Adsorption rate at air/water interface decreased with an increase in hydrocarbon chain length, chain number, and concentration of respective compounds. Further, the kinetics were discussed using the monomer diffusion coefficient obtained from short and long time scales in dynamic surface tension plots. In addition, the aggregation properties of 2C(n)Cys for n = 8 and 10 differed from those in the case of n = 12. In other words, relatively larger micelles with diameters of approximately 7 nm were formed by 2C(n)Cys for n = 8 and 10 in comparison to those formed by C(n)Cys (2-3 nm). On the other hand, for a 0.832 mmol dm(-3) 2C(12)Cys solution, the aggregation structure investigated by cryogenic transmission electron microscopy (cryo-TEM) and small-angle neutron scattering (SANS) revealed the coexistence of small unilamellar vesicles and small rods. (c) 2006 Elsevier Inc. All rights reserved., Apr. 2007, 308, 2, 466, 473, Scientific journal, 10.1016/j.jcis.2006.11.038
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Adsolubilization of 2-naphthol into adsorbed layers of triblock PEO-PPO-PEO copolymers on hydrophobic silica particles, Daisuke Tsurumi; Kenichi Sakai; Tomokazu Yoshimura; Kunio Esumi, Adsolubilization of 2-naphthol into an adsorbed layer of triblock poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEOPPO-PEO, Pluronics) copolymers on hydrophobically modified silica particles has been investigated. Four kinds of Pluronics (P103, P105, P123, and F108) were employed in order to understand the effect of the hydrophobicity of the surfactants on the adsolubilization. The amount of the Pluronics adsorbed of the maximum/saturation adsorption level was increased with a decrease in the HLB value, suggesting that the more hydrophobic Pluronics (P103 and P123) adsorb preferentially onto the hydrophobic silica surface over the more hydrophilic Pluronics (P105 and F108). The greater adsorbed amount of the more hydrophobic surfactants resulted in a greater amount of 2-naphthol adsolubilized into the adsorbed Pluronics layers. In the case of simultaneous addition of the Pluromes and 2-naphthol, the amount adsolubilized into the adsorbed P123 and P103 layers increased in their low-surfactant-concentration regime, reached a maximum, and then decreased with a further increase in the Pluronics concentration. On the other hand, for both the P105 and F108 copolymers, a decrease in the adsolubilized amount was not observed over the whole range of copolymer concentration investigated. This difference is attributed to a difference in the hydrophobicity of the micellar aggregates in solution and of the adsorbed layers on the hydrophobic surface. When 2-naphthol was added after replacement of the Pluronics supernatant by a surfactant-free solution, the final decrease in the adsolubilization was insignificant for all the Pluronics. Indeed, the maximum amount of adsolubilization was comparable to the corresponding amount obtained in the case of simultaneous addition. (c) 2006 Elsevier Inc. All rights reserved., Oct. 2006, 302, 1, 82, 86, Scientific journal, 10.1016/j.jcis.2006.06.012
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Scavenging DPPH radicals catalyzed by binary noble metal-dendrimer nanocomposites, Takeshi Endo; Takae Fukunaga; Tomokazu Yoshimura; Kunio Esumi, Catalytic activity of gold-platinum, gold-palladium, and platinum-palladium dendrimer nanocomposites for scavenging 1,1-diphenyl-2picrylhydrazyl (DPPH) radicals was investigated. The gold-platinum and gold-palladium dendrimer nanocomposites were prepared via simultaneous reduction by sodium borohydride in the presence of poly(amidoamine) (PAMAM) dendrimers with amine or carboxyl terminal groups. The particles were not mixtures of monometallic particles but alloyed bimetallic particles. Bimetallic particles exhibited higher catalytic activity than monometallic ones. (c) 2006 Elsevier Inc. All rights reserved., Oct. 2006, 302, 2, 516, 521, Scientific journal, 10.1016/j.jcis.2006.06.053
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Adsorption and aggregation properties of heterogemini surfactants containing a quaternary ammonium salt and a sugar moiety, Kanae Nyuta; Tomokazu Yoshimura; Koji Tsuchiya; Takahiro Ohkubo; Hideki Sakai; Masahiko Abe; Kunio Esumi, A novel heterogemini surfactant comprising two hydrocarbon chains and two different hydrophilic groups such as a quaternary ammonium cation and gluconamide nonion N,N-dimethyl-N-[2-(N'-alkyl-N'-gluconamide)ethyl]-1-alkylammonium bromides (2C(n)AmGlu, where n represents hydrocarbon chain lengths of 8, 10, 12, and 14) was synthesized by reacting N,N-dimethylethylenediamine with alkyl bromide, followed by a reaction with 1,5-D(+)gluconolactone. The adsorption properties of 2C(n)AmGlu were characterized by surface tension measurements made using the Wilhelmy plate method, and their aggregation properties were investigated by dynamic light scattering and cryogenic transmission electron microscopy techniques. The relationship between the hydrocarbon chain length and the logarithm of the critical micelle concentration (cmc) for 2C(n)AmGlu exhibited a linear decrease when the chain length was increased up to 12 and then a departure from linearity at n = 14. The surface tension reached 24-26 mN m(-1) at each cmc, indicating high efficiency in lowering the surface tension of water. Furthermore, it was found that the structure of the aggregate formed for 2CnAmGlu in solution was influenced by the hydrocarbon chain length; that is, for n = 10 and 12, micelles with a hydrodynamic radius of 2-5 nm were formed, whereas vesicles were also observed for n = 14., Oct. 2006, 22, 22, 9187, 9191, Scientific journal, 10.1021/la061688h
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Surface tension and micellization properties of heterogemini surfactants containing quaternary ammonium salt and sulfobetaine moiety, Kanae Nyuta; Tomokazu Yoshimura; Kunio Esumi, A novel gemini surfactant with two hydrocarbon chains and two different hydrophilic parts containing a quaternary ammonium salt and a sulfobetaine moiety, N,N-dimethyl-N-{2-[N'-methyl-N'-(3-sulfopropyl)-alkylammonium]ethyl}-1-alkylammonium bromides (2C(n)AmSb, where n represents hydrocarbon chain lengths of 8, 10, 12, and 14), was synthesized by reacting N,N,N'-trimethylethylenediamine with n-alkyl bromide, followed by reacting with 1,3-propane sultone. The adsorption and aggregation properties of 2C(n)AmSb in the absence and presence of NaCl were characterized by the measurement of surface tension, steady-state fluorescence, and dynamic light scattering. The critical micelle concentration (cmc) and surface tension at the emc of 2C(n)AmSb were compared with those for the corresponding monomeric surfactants, their mixtures, and gemini surfactants. The poor solubility in water shown by 2C(n)AmSb was improved by the addition of NaCl. The cmc of 2C(n)AmSb in the presence of NaCl is lower than that in the absence of NaCl, and the surface tension is almost identical for both systems. The radius of the aggregates formed by 2C(n)AmSb in a solution containing NaCl is found to be 0.70 +/- 0.3, 2.5 +/- 0.7, 5.6 +/- 1.4, and 10.7 +/- 2.4 nm for n = 8, 10, 12, and 14, respectively. The particle size increases with an increase in hydrocarbon chain length; in particular, relatively large aggregates are formed for n = 12 and 14. (c) 2006 Elsevier Inc. All rights reserved., Sep. 2006, 301, 1, 267, 273, Scientific journal, 10.1016/j.jcis.2006.04.075
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Interaction forces between poly (amidoamine) (PAMAM) dendrimers adsorbed on gold surfaces, D Hiraiwa; T Yoshimura; K Esumi, Interaction forces between two gold surfaces with adsorbed poly(amidoamine) (PAMAM) dendrimers (generations G3.0 and G5.0) have been investigated using colloidal probe atomic force microscopy (AFM). In the absence of dendrimers or at their low concentrations, an attractive force derived from the van der Waals interaction was observed. On the other hand, this attractive interaction changed to repulsion with increasing dendrimer concentration. The origin of the repulsion can be attributed to either an electric double layer interaction or a steric effect of the adsorbed dendrimers, depending on the concentration of dendrimer. The steric hindrance was also influenced by the generation of the dendrimer; the force-detectable distance in the presence of PAMAM G5.0 dendrimer was slightly longer than that in the presence of G3.0 dendrimer. In order to estimate the occupied area of each dendrimer adsorbed on gold, quartz crystal microbalance (QCM) measurement was also carried out. (c) 2006 Elsevier Inc. All rights reserved., Jun. 2006, 298, 2, 982, 986, Scientific journal, 10.1016/j.jcis.2005.12.060
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Azeotropic mixing Of C(16)peLac with different surfactants of monomeric and dimeric nature under the effect of temperature, MS Bakshi; G Kaur; T Yoshimura; K Esumi, The steady state fluorescence measurements have been performed for the binary mixtures of N-hexadecyl-N'-lactobionylethylenediamine (C(16)peLac) with a variety of surfactants such as 3-(N,N-dimethylhexadecylammonio) propane sulphonate (HPS), dodecylhexadecyldimethyl ammonium bromide (12-0-16), trimethylene-1,3-bis(dodecyldimethylammonium bromide) (12-3-12), and hexamethylene-1,6bis(dodecyldimethylammonium bromide) (12-6-12) over the whole mixing range in the temperature range of 15-45 degrees C. From the variation of I-1/I-3 intensity ratio of pyrene fluorescence, the critical micelle concentration (cmc) of single and mixed surfactants has been determined. The nature of the mixed micelles has been evaluated with the help of regular solution theory. The micellar parameters such as micelle mole fraction (X-1), and regular solution interaction parameter (beta), have been determined for all the binary mixtures. It has been observed that the mixed micelles of C(16)peLac + 12-0-16/HPS are formed due to synergistic interactions while unfavorable interactions have been found during the mixed micellization of C(16)peLac + 12-3-16/12-6-12 mixtures. The former behavior came from the reduction in the polar head group repulsions of 12-0-16 and HPS upon the intercalation of C(16)peLac. On the other hand, large spacer groups in bulky dimeric head groups as in case of 12-3-12 and 12-6-12 results in unfavorable interactions with C(16)peLac. (c) 2006 Elsevier B.V. All rights reserved., Jun. 2006, 281, 1-3, 163, 170, Scientific journal, 10.1016/j.colsurfa.2006.02.058
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Equilibrium and dynamic surface tension properties of partially fluorinated quaternary ammonium salt gemini surfactants, T Yoshimura; A Ohno; K Esumi, The equilibrium and dynamic surface tension properties of a partially fluorinated quaternary ammonium salt gemini surfactant 1,2-bis[dimethyl-(3-perfluoroalkyl-2-hydroxypropyl)ammonium]ethane bromide ((CnC3)-C-F-2-C3CnF, where n represents fluorocarbon chain lengths of 4, 6, and 8) were investigated, and the effects of the fluorocarbon chain length and the number of chains on them were discussed. The plot of the logarithm of the critical micelle concentration (cmc) against the fluorocarbon chain length for (CnC3)-C-F-2-C-3 C-n(F) showed a linear decrease with an increase in chain length. On the basis of the slope of this plot, it was found that the variation in cmc with respect to the chain length is large for fluorinated gemini surfactants. The surface tension at the cmc decreased significantly; this surface tension value is lower than that of conventional fluorinated monomeric surfactants. In particular, the lowest value was 13.7 mN m(-1) for n = 8. Furthermore, it was confirmed that the kinetics of adsorption at the interface decrease with an increase in the fluorocarbon chain length and the concentration., May 2006, 22, 10, 4643, 4648, Scientific journal, 10.1021/la0534266
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Adsolubilization of 2-naphthol into adsorbed layer of PEO-PPO-PEO triblock copolymers on hydrophilic silica, D Tsurumi; T Yoshimura; K Esumi, Adsolubilization of 2-naphthol into an adsorbent layer of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymers (Pluronics) on hydrophilic silica has been investigated. Four kinds of Pluronics (P103, P105, P123, and F108) were used in order to understand the effect of the hydrophobicity of surfactant on the adsolubilization. The order of the adsorption in the saturation level was found to be P123 approximate to P103 > P105 >> F108, meaning that Pluronics with higher hydrophobicity can adsorb perferentially to the silica surface. Indeed, this order was parallel to the order of the adsolubilization amount of 2-naphthol. In the case of co-addition of the Pluronics and 2-naphthol, the adsolubilization amount increased gradually at lower surfactant concentration regions, reached a maximum, and then decreased with increasing concentration of the Pluronics. The maximum amount appeared at critical polymolecular micelle concentration of each Pluronics. On the other hand, the final decrement was not observed when 2-naphthol was added after replacement of the Pluronics supernatant by the Pluronics free solution. These results suggest that adsolubilization behavior is influenced by the existence of the polymolecular micellar aggregates in the solution phase. (c) 2005 Elsevier Inc. All rights reserved., May 2006, 297, 2, 465, 469, Scientific journal, 10.1016/j.jcis.2005.11.027
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Spectroscopic investigation on the hydrophobicity in the mixtures of nonionic plus twin tail alkylammonium bromide surfactants, MS Bakshi; K Singh; G Kaur; T Yoshimura; K Esumi, The mixed micelle study of C10E8, C12E4, and C14E8 nonionic surfactants with 12-0-8, 12-0-10, 12-0-12, and 12-0-16 twin tail alkylammonium bromides has been carried out with the help of pyrene fluorescence, dynamic light scatterings (DLS), and electron spin resonance (ESR) measurements. The pyrene fluorescence allowed us to determine the mixed cmc and aggregation number (N-agg), while the size of the mixed aggregates, and rotation correlation time (tau(c),) of the spin probe have been evaluated from DLS and ESR, respectively. Application of the regular solution theory showed that the mixed micelle formation in the mixtures of C10E8/C12E4 + cationic surfactants occurred due to the synergistic interactions, and the regular solution theory interaction parameter, beta, became more negative with an increase in the hydrophobicity of the cationic component. A variation in the micelle mole fraction suggested that the mixed micelles are mainly rich in the nonionic component. An increase in the hydrophobicity of the nonionic surfactant from C10E8 to C14E8 induced antagonistic mixing in the mixtures of C14E8 with cationic surfactants of longer hydrophobic tail. This was attributed to the mutual incompatibility among the longer hydrophobic tails of the unlike components. The DLS and ESR measurements fully supported the above results, where the size of the aggregates increases with the increase in hydrophobicity. (c) 2005 Elsevier B.V. All fights reserved., Apr. 2006, 278, 1-3, 129, 139, Scientific journal, 10.1016/j.colsurfa.2005.12.009
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Interaction of cationic gold nanoparticles and carboxylate-terminated poly(amidoamine) dendrimers, A Okugaichi; K Torigoe; T Yoshimura; K Esumi, Interaction between cationic gold nanoparticles ligated with 3-mercaptopropyltrimethylammonium chloride (MPTAC) and anionic poly(amidoamine) (PAMAM) dendrimers with carboxylate, terminals (Generation 3.5 and 5.5-COONa) has been investigated in aqueous solution and on carbon film by UV-vis, TEM, DLS and zeta potential measurements. In the absence of PAMAM dendrimers, the MPTAC-Au nanoparticles in water exhibited a surface plasmon resonance (SPR) band at 520 nm. The gold particles of 4.2 nm in mean diameter were homogeneously dispersed on the carbon grids. Addition of PAMAM brought about an increase in the absorbance and redshift of the SPR band, which was attributed to aggregation of the gold nanoparticles by adsorption of the dendrimer to the MPTAC ligand layers owing to electrostatic attraction. In particular, chainlike aggregates were formed at low concentrations of the dendrimer (r = [PAMAM]/[MPTAC] <= 1). While a further increase in the dendrimer concentration (r = 2) led to a remarkable decrease in the size of aggregates, and; m,, of the SPR band returned to approximately the same wavelength as that for r = 0.5. (c) 2005 Elsevier B.V. All rights reserved., Feb. 2006, 273, 1-3, 154, 160, Scientific journal, 10.1016/j.colsurfa.2005.08.028
  • Refereed, JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, AMER SCIENTIFIC PUBLISHERS, Preparation and catalytic activity of Au-Pd, Au-Pt, and Pt-Pd binary metal dendrimer nanocomposites, T Endo; T Kuno; T Yoshimura; K Esumi, Catalytic activity of Au-Pt, Au-Pd, and Pt-Pd dendrimer nanocomposites for reduction of p-nitrophenol was investigated in water. The bimetallic dendrimer nanocomposites were prepared by simultaneous reduction with sodium borohydride in the presence of poly(amidoamine) (PAMAM) dendrimers with amine and carboxyl terminal groups. Average diameters of the obtained particles were 2-4 nm by transmission electron microscopy. From UV-vis spectroscopy, it was found that the particles were not mixtures of monometallic particles but binary ones. X-ray photoelectron spectroscopy showed that formation of binary composite particles prevents palladium atoms from oxidation. The Au-Pd and Pt-Pd binary particles exhibited higher catalytic activity than monometallic ones. On the other hand, catalytic activity of Au-Pt binary particle was comparable to that of platinum nanoparticles., Nov. 2005, 5, 11, 1875, 1882, Scientific journal, 10.1166/jnn.2005.438
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Sugar-based gemini surfactants with peptide bonds-synthesis, adsorption, micellization, and biodegradability, T Yoshimura; K Ishihara; K Esumi, The sugar-based gemini surfactant with peptide bonds, N,N-bisalkyl-NN'-bis[2-(lactobionylamide)-ethyl]hexanediamide (2C(n)peLac, in which n represents hydrocarbon chain lengths of 12 and 16), was synthesized by reacting adipoyl chloride with the corresponding monomeric surfactant N-alkyl-N'-lactobionylethylenediamine (C(n)peLac), which was obtained by reacting ethylenediamine with alkyl bromide and lactobionic acid. The adsorption and micellization properties of C(n)peLac and 2C(n)peLac were characterized by the measurement of their equilibrium and dynamic surface tension, steady-state fluorescence using pyrene as a probe, dynamic light scattering (DLS), and time-resolved fluorescence quenching (TRFQ), and their biodegradability was also investigated. The critical micelle concentration (cmc) decreases with an increase in the hydrocarbon chains from monomeric to gemini surfactants, whereas it increases with an increase in the chain length from 12 to 16 for both systems. The increases in both the hydrocarbon chain the h h ower e and the chain length of sugar-based surfactants reduce surface activities suc surface tension, the occupied area per molecule, and the adsorption rate at the air/water interface. The sugar-based surfactants CnPeLac and 2CnpeLac exhibit unique aggregation behavior in aqueous solution. The DLS results indicate that the apparent hydrodynamic diameter of CnpeLac micelles decreases sharply with increasing concentration, whereas that of 2C(n)peLac micelles decreases gradually. From the TRFQ measurement, it was observed that, as concentration increases, the aggregation numbers are almost constant for C(n)peLac, whereas they increase for 2C(n)peLac. These results imply that loosely packed micelles formed by sugar-based surfactants become tightly packed micelles as the concentration increases. Furthermore, it was found that 2C(n)peLac shows lower biodegradability than does C(n)peLac because it contains tertiary amines in the molecule., Nov. 2005, 21, 23, 10409, 10415, Scientific journal, 10.1021/la051614q
  • Refereed, COLLOID AND POLYMER SCIENCE, SPRINGER, Characterization of aliphatic and aromatic polyester hyperbranched dendrimers by AFM imaging, MS Bakshi; R Sood; G Kaur; K Sakai; T Yoshimura; K Esumi, The aggregates of aliphatic (AL-PE) and aromatic polyester (AR-PE) hyperbranched dendrimers were imaged by tapping mode atomic force microscopy (AFM). The second and third generations of AL-PE dendrimers were adsorbed on mica in large aggregates of 150- and 166-nm diameters with little heights (ca. 1-2 nm). The origin of such flattened aggregates is attributed to their favorable adsorption on mica in view of the presence of -OH surface groups. AR-PE did not show such flattened aggregates instead small aggregates of 63 nm were observed in an organized manner beaving a cavity in the center of each aggregate. The organized aggregates of AR-PE with smaller dimension than AL-PE are ascribed to less favorable adsorption of the latter on mica in view of its stronger hydrophobicity., Oct. 2005, 284, 1, 74, 79, Scientific journal, 10.1007/s00396-005-1322-5
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Antioxidant Activity of Noble Metal (Gold, Platinum)-Biopolymer Nanocomposites PartII, YOSHIMURA Tomokazu; S.Akiyama; T.Yoshimura; K.Torigoe; K.Esumi, Three different platinum-biopolymer nanocomposites have been prepared independently in the presence of hexachloroplatinic acid and biopolymers like fucoidan, alginic acid and sodium hyaluronate (NaHA) via sodium borohydride reduction. The average particle diameter of platinum nanoparticles using fucoidan becomes slightly smaller, with a decrease of the concentration of fucoidan, ranging from 3.1 to 2.6 nm. On the other hand, the average particle diameter of platinum nanoparticles using NaHA becomes slightly larger, with a decrease of the concentration of NaHA, ranging from 3.4 nm to 3.8 nm. The average particle diameter of platinum nanoparticles using alginic acid is 3.2-3.4 nm which is independent of the biopolymer concentrations. The antioxidant activities of the platinum-biopolymer nanocomposites upon elimination of hydroxyl radicals formed in an H2O2/FeSO4 system have been studied using a spin-trapping method; All the nanocomposites exhibit high catalytic activities that are affected by the concentration and the kind of the biopolymer. In addition, the activities of the platinum-biopolymer nanocomposites are higher than those of the gold-biopolymer nanocomposites. The highest antioxidant activity for the platinum-alginic acid nanocomposites was 110 times higher than that of ascorbic acid., Sep. 2005, 78, 9, 409-416, 416, 10.4011/shikizai1937.78.409
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Topographical and photophysical properties of poly(amidoamine) dendrimers with ionic surfactants, MS Bakshi; A Kaura; R Sood; G Kaur; T Yoshimura; K Torigoe; K Esumi, The atomic force microscopy (AFM) and transmission electron microscopy (TEM) have been performed on the poly(amidoamine) dendrimers of second generation (2G) and its fluoroderivative (2D) at room temperature. Both studies have demonstrated that 2G and 2D exist in large aggregates on solid surface. The presence of ionic surfactants facilitates their solubilization in micellar phase resulting in the aggregates of much smaller dimensions. The aqueous bulk properties of 2G and 2D both in the absence as well as in the presence of ionic surfactants (i.e. dodecyltrimethylammonium bromide (DTAB), dimethylene bis (dodecyldimethylammonium bromide) (12-2-12), and sodium dodecyl sulfate (SDS)) have been carried out with the help of pyrene fluorescence and turbidity (tau) measurements. From the variation of I-1/I-3 pyrene intensity and the T of these aqueous solutions, it has been found that both DTAB and 12-2-12 interact with the surface groups of 2G and 2D favorably in basic medium, while SDS has been found to interact with that in acidic medium. Apart from this, interactions of cationic surfactants have been found to be stronger with 2D in comparison to 2G, while reverse has been observed in the case of SDS. (c) 2005 Elsevier B.V. All rights reserved., Sep. 2005, 266, 1-3, 181, 190, Scientific journal, 10.1016/j.colsurfa.2005.06.059
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Preparation of Au/TiO2 nanocomposites and their catalytic activity for DPPH radical scavenging reaction, R Isono; T Yoshimura; K Esumi, Au/TiO2 nanocomposites have been prepared by UV photolysis or chemical reduction of a Au(III) complex formed on a spherical or a rodlike TiO2 support, and their catalytic activity for 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging reaction was investigated. The chemical reduction with dimethylamine borane (DMAB) provided smaller gold nanoparticles than those synthesized by UV photolysis. Type of the TiO2 also affected the size of gold particles; smaller gold particles were deposited on the spherical TiO2 support than on rodlike one. For the radical scavenging reaction, the Au/TiO2 nanocomposites prepared by chemical reduction exhibited a higher catalytic activity than those photochemically prepared, and rodlike TiO2 provided a higher activity than spherical one. The effects of preparation methods and type of TiO2 supports on the catalytic activity are discussed. (c) 2005 Elsevier Inc. All rights reserved., Aug. 2005, 288, 1, 177, 183, Scientific journal, 10.1016/j.jcis.2005.02.078
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Morphological Change of Calcium Carbonate Prepared in Aqueous Dendrimer Solutions, YOSHIMURA Tomokazu; K.Esumi; K.Tagami; T.Yoshimura, Calcium carbonate particles were prepared using solutions of CaCl2, urea, and poly (amidoamine) PAMAM dendrimers (G 1. 5, G 3.5, and G 5.5) with terminal carboxylates at 90°C. In the absence of dendrimers, uniform needlelike aragonite particles were formed, whereas when the concentration of dendrimers increased particles transformed to spherical vaterite. We used another method to obtain calcium carbonate particles from solutions containing CaCl2, urea, urease, and dendrimer at 25°C. Transmittance in the samples and X-ray diffraction measurements indicate that in the presence of dendrimer, at first vaterite particles are formed which then transform to calcite with the elapsed time, while in the absence of dendrimer only calcite particles are formed., Jun. 2005, 78, 6, 254-259, 259, 10.4011/shikizai1937.78.254
  • Refereed, Langmuir, Zwitterionic heterogemini surfactants containing ammonium and carboxylate headgroups. 1. Adsorption and micellization, Tomokazu Yoshimura; Kanae Nyuta; Kunio Esumi, Zwitterionic heterogemini surfactants with two hydrocarbon chains and two different hydrophilic groups, N,N-dimethy-N- [2-(N′-alkyl-N′-β- carboxypropanoylamino)ethyl]- 1-alkylammonium bromides (2CnAmCa, where n represents the hydrocarbon chain lengths of 8, 10, 12, and 14), were synthesized by N,N-dimethylethylenediamme with alkyl bromide, followed by reaction with succinic anhydride. One of the hydrophilic groups is a carboxylate anion, and the other is an ammonium cation. Their physicochemical properties were characterized by measuring equilibrium and dynamic surface tension, fluorescence intensity of pyrene, and light-scattering intensity. A relationship between a logarithm of critical micelle concentration (cmc) and hydrocarbon chain length showed a linear decrease upon increasing chain length and then a departure from linearity at n = 14. This is due to the existence of premicellar aggregations at concentrations below the cmc for n = 14. The surface tension of 2CnAmCa reached 27-30 mN m-1 at each cmc, indicating efficiencies typical of hydrocarbon chain surfactants. The adsorbing rate at the air/water interface became slow with an increase of the chain length. From the fluorescence intensity ratios of 373 and 384 nm using pyrene as a probe, for n = 8, 10, and 14, the pyrene was solubilized in surfactant micelles at around the cmc, whereas for n = 12 the pyrene was solubilized from a concentration of 10-fold the cmc. The scattering intensities by dynamic light scattering also increased from around these concentrations for each chain length, showing the formation of aggregates in solution. © 2005 American Chemical Society., 29 Mar. 2005, 21, 7, 2682, 2688, Scientific journal, 10.1021/la047773b
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Synthesis and catalytic activity of gold-silver binary nanoparticles stabilized by PAMAM dendrimer, T Endo; T Yoshimura; K Esumi, Gold-silver binary nanoparticles, which feed atomic ratios of gold to silver were 3: 1, 1: 1, and 1:3, were prepared. These particles were stabilized by amine-terminated (generation (G) 3.0 and 5.0) and carboxyl-terminated (G 3.5 and 5.5) poly(amidoamine) (PAMAM) dendrimers in water. UV-vis spectra indicate that the particles are not mere physical mixtures of monometallic particles or core/shell type but alloy. According to transmission electron microscope (TEM) observation, the mean diameters of the particles were 7-10 nm for silver particles and 3-4 nm for both gold and alloy particles, respectively. Catalytic activities for reduction of p-nitrophenol were investigated by monitoring the absorbance at 400 nm during the reaction. They were proportional to the feed ratio of gold in the particles and showed a maximum at the ratio of Au:Ag = 3: 1. (c) 2005 Elsevier Inc. All rights reserved., Jun. 2005, 286, 2, 602, 609, Scientific journal, 10.1016/j.jcis.2005.01.057
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Preparation of gold-, gold/silver-dendrimer nanocomposites in the presence of benzoin in ethanol by UV irradiation, K Esumi; T Matsumoto; Y Seto; T Yoshimura, Gold- and gold/silver-dendrimer nanocomposites have been synthesized by UV irradiation of their salts dissolved in ethanol containing dendrimers. As dendrimers, poly(amidomaine) PAMAM dendrimers and poly(propyleneimine) PPI dendrimers of various generations were used, The photoreduction of their salts is greatly accelerated by using benzoin as a photoinitiator. The sizes of gold in the nanocomposites are affected by the concentration of benzoin as well as the concentration of dendrimers, but are hardly changed with the kind of dendrimers. For gold/silver-dendrimer nanocomposites, the absorption spectra of gold/silver nanoparticles in the nanocomposites are very similar to the theoretical spectra of gold/silver alloy nanoparticles, suggesting the formation of gold/silver alloy nanoparticles. From the comparison of TEM and DLS measurements, it is found that the metal-dendrimer nanocomposites consist of metal nanoparticles covering by dendrimer molecules. (c) 2004 Elsevier Inc. All rights reserved., Apr. 2005, 284, 1, 199, 203, Scientific journal, 10.1016/j.jcis.2004.09.020
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Antioxidant Activity of Noble Metal (Gold, Platinum)-Biopolymer Nanocomposites, YOSHIMURA Tomokazu; S.Akiyama; T.Yoshimura; K.Esumi, Three different gold-biopolymer nanocomposites have been prepared independently in the presence of tetrachloroauric acid and biopolymers like fucoidan, alginic acid and sodium hyaluronate via sodium borohydride reduction. The average particle size of gold nanoparticles using fucoidan becomes smaller, with a decrease of the concentration of fucoidan, ranging from 6.8 nm to 3.2 nm. On the other hand, the average particle sizes of the gold nanoparticles are 3.4 nm-5.4nm for alginic acid and sodium hyaluronate cases and independent of the biopolymer concentrations. The antioxidant activities of the gold-biopolymer nanocomposites upon elimination of hydroxyl radicals formed in an H2O2/FeSO4 system have been examined using a spin-trapping method. The gold-biopolymer nanocomposites exhibit high catalytic activities that are affected by the concentration and the kind of the biopolymer. The highest antioxidant activity obtained by the gold-alginic acid nanocomposites has been observed to be 60 times higher than that of ascorbic acid., Mar. 2005, 78, 3, 112-121, 121, 10.4011/shikizai1937.78.112
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Characterization of quaternized poly (amidoamine) dendrimers of generation 1 with multiple octyl chains, T Yoshimura; S Abe; K Esumi, A quaternized dendrimer-type surfactant with 16 octyl chains and 16 ammonium groups (refer to C(8)qbGl) has been synthesized by the reaction of poly(amidoamine) dendrimer of generation I with glycidyldimethyloctylammonium bromide, and its physicochemical properties have been characterized by measuring surface tension, fluorescence spectroscopy of pyrene, specific conductivity, dynamic light-scattering (DLS) and electrophoretic light-scattering (ELS). The surface tension of C(8)qbGl decreases gradually with increasing concentration, and reaches two break points, probably indicating that the quaternized dendrimers adsorb and saturate at the air/water interface, and then interact strongly with them being at the interface. The concentrations at two break points coincide with those obtained by the electrical conductivity method. The fluorescence intensity ratio of the first to the third band in the emission spectrum of pyrene for C(8)qbGl continues to decrease slowly from 3-fold-concentration of first break point obtained by the surface tension method. In addition, the results of DLS and ELS show that C(8)qbGl forms large aggregates with positive-potentials in the solution, and these sizes become large with the concentration. One of the reasons for such a bulk behavior may be caused by the attractive interaction between multiple hydrocarbon chains of C(8)qbGl. (C) 2004 Elsevier B.V. All rights reserved., Dec. 2004, 251, 1-3, 141, 144, Scientific journal, 10.1016/j.colsurfa.2004.09.031
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Comparison of Gold-PAMAM and Gold-PPI Dendrimer Nanocomposites for Antioxidant Action, YOSHIMURA Tomokazu; K.Esumi; H.Houdatsu; T.Yoshimura, Gold-dendrimer nanocomposites were prepared in the presence of poly (amidoamine) (PAMAM) dendrimer (generation 3, 3.5, 5, and 5.5) or poly (propyleneimine) (PPI) dendrimer (generation 3 and 4) via reduction of HAuCl4 with sodium borohydride. The average particle sizes of the gold nanoparticles were independent of the dendrimer concentration as well as the dendrimer generation, ranging between 3.0 and 4.3 nm in diameter for PAMAM dendrimers and between 2.1 and 2.3 nm in diameter for PPI dendrimers. The catalytic activities of the gold-dendrimer nanocomposites upon elimination of hydroxyl radicals formed in an H2O2/FeSO4 system was examined using a spin-trapping method. The catalytic activity of gold-PPI dendrimer nanocomposites was slightly lower than that of gold-PAMAM dendrimer nanocomposites. In addition, the gold-dendrimer nanocomposites exhibited high catalytic activities which were hardly affected by the concentration as well as the generation of the dendrimer except PAMAM dendrimer 3.5. The highest activity for the gold-PAMAM dendrimer G3.5 nanocomposites was 85 times that of ascorbic acid., Nov. 2004, 77, 11, 487-492, 492, 10.4011/shikizai1937.77.487
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Association behavior of poly(ethylene oxide)-polypropylene oxide)poly(ethylene oxide) block copolymers with cationic surfactants in aqueous solution, MS Bakshi; S Sachar; T Yoshimura; K Esumi, The association behavior of poly(ethylene oxide)-polypropylene oxide)-polyethylene oxide) (PEO-PPO-PEO) block copolymers in aqueous solution with hexadecyltrimethylammonium bromide (HTAB), tetradecyltrimethylammonium bromide (TTAB), and dimethylene bis(decyldimethylammonium bromide) (10-2-10), was studied by fluorescence, viscosity, and Krafft temperature measurements. It has been observed that (EO)(18)(PO)(31)(EO)(18) interacts more strongly than (EO)(2)(PO)(15.5)(EO)(2) and (EO)(2.5)(PO)(31)(EO)(2.5) with HTAB/TTAB due to synergistic interactions. A stronger capability of (EO)(18)(PO)(31)(EO)(18) to interact with cationic surfactants arises from the greater number of electronegative EO units (total 36 EO units) than of (EO)(2)(PO)(15.5)(EO)(2) (total 4 EO units) and (EO)(2.5)(PO)(31)(EO)(2.5) (total 5 EO units). The antagonistic mixing behavior of present triblock polymers has been observed with 10-2-10. A difference in the mixing behavior of the latter from that of HTAB/TTAB has been attributed to its dimeric nature, which may create steric hindrances with triblock polymer components at the head group region in the mixed state. (C) 2004 Elsevier Inc. All rights reserved., Oct. 2004, 278, 1, 224, 233, Scientific journal, 10.1016/j.jcis.2004.05.025
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Dodecyltrimethylammonium and Di(dodecyldimethylammonium) bromides interactions with poly (amidoamine) dendrimer, MS Bakshi; A Kaura; RK Mahajan; T Yoshimura; K Esumi, The conductivity (kappa), surface tension (gamma), viscosity (eta), dynamic light scattering (DLS) and Krafft temperature (K-T) measurements of aqueous dodecyltrimethylammonium bromide (DTAB) and di(dodecyldimethylammonium bromide) (12-2-12) with poly (amidoamine) (PAMAM) dendrimers have been carried out at 25 degreesC. From the K data, the apparent critical micelle concentration (acmc) for 12-2-12 and DTAB in aqueous PAMAM and complex forming concentration of PAMAM (C-S) were computed. Both acme and C-S increased with the increase in [PAMAM] and [12-2-12], respectively. The gamma studies indicated a considerable decrease in the gamma value for 12-2-12 in aqueous 0 and 1 G than 0.5 and 1.5 G. However, similar gamma behavior of DTAB in aqueous PAMAM did not discriminate among various generations. From 17 studies, the intrinsic viscosities of 12-2-12 ([eta](12-2-12)) and DTAB ([eta](DTAB)) for 12-2-12 and DTAB in aqueous PAMAM were computed. Both values were higher for 12-2-12 than for DTAB suggesting stronger association in 12-2-12 + PAMAM complex. (C) 2004 Elsevier B.V. All rights reserved., Oct. 2004, 246, 1-3, 39, 48, Scientific journal, 10.1016/j.colsurfa.2004.07.017
  • Refereed, J. Jpn. Soc. Colour Mater., Interaction forces Between Glass Surfaces with Adsorption of Quaternary Trimeric Surfactants, YOSHIMURA Tomokazu; S.Sadayama; T.Yoshimura; K.Esumi, Oct. 2004, 77, 10, 435-440
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Synthesis and surface properties of anionic gemini surfactants with amide groups, T Yoshimura; K Esumi, Novel anionic gemini surfactants, 1,2-bis(N-beta-carboxypropanoyl-N-alkylamino)ethane (2C(n)enAm; n is hydrocarbon chain length of 6, 8, 10, 12, or 14), with two hydrocarbon chains, two carboxylate groups, and two amide groups, were synthesized by three-step reactions. Their solution properties were characterized by equilibrium and dynamic surface tension, steady-state fluorescence spectroscopy of pyrene, and dynamic light-scattering techniques. The surface tension measurements of 2C(n)enAm give low critical micelle concentrations (cmc), great efficiency in lowering the surface tension, and strong adsorption at air/water interface. Gemini surfactants behave normally with the logarithm of cmc decrease linearly with the chain length. In addition, adsorption and micellization behavior of 2C(n)enAm was estimated by parameter of pC(20), cmc/C-20, and standard free energy (DeltaG(mic)(0) and DeltaG(ads)(0)); they are significantly influenced by hydrocarbon chain length, and the adsorption is promoted more than the micellization as chain length becomes longer. The results of dynamic light-scattering and fluorescence quenching indicate that small micelles of 2C(n)enAm are observed at the concentrations above the cmc, and further large particles are also seen. Further, from the dynamic surface tension measurements, it is found that the shorter hydrocarbon chain length of 2C(n)enAm, the faster the rate of decrease of surface tension. (C) 2004 Elsevier Inc. All rights reserved., Aug. 2004, 276, 1, 231, 238, Scientific journal, 10.1016/j.jcis.2004.03.045
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Physicochemical properties of anionic triple-chain surfactants in alkaline solutions, T Yoshimura; K Esumi, Physicochemical properties of two types of anionic triple-chain surfactants of disodium 2, 10-didecyl-6-dodecyl-3,6,9-triazaundecanedioate (3C(12)dtda) with three hydrocarbon chains and two carboxylate headgroups, and trisodium tris(N-2-ethylamino-N'-2-dodecylcarboxylato)-azane (3C(12)tata) with three hydrocarbon chains and three carboxylate headgroups were characterized by several techniques such as static surface tension, fluorescence spectroscopy, and dynamic and static light-scattering in alkaline solutions at pH 13. 3C(12)dtda shows a much lower critical micelle concentration (cmc) and higher efficiency in lowering the surface tension than 3C(12)tata. 3C(12)dtda also provides a very small occupied area per molecule as compared to 3C(12)tata and packs closely at the interface. The fluorescent intensity ratio of the first to third band in the emission spectra of pyrene for two triple-chain surfactants starts to decrease gradually from around the cmc obtained by the surface tension method, and decreases sharply from the concentration of 10-18 fold cmc. It is also found that the polarity of the triple-chain surfactant micelle is very much lower than that of the single-chain surfactant micelle. The results of dynamic and static light-scattering measurements show the difference behavior in the aggregation process for two triple-chain surfactants; that is, 3C(12)dtda forms large aggregates, and 3C(12)tata forms two aggregates of normal micelle size and a larger one in solution. This indicates that the aggregation states of triple-chain surfactants differ by the number of carboxylate groups, and the large aggregates are derived from the strong attractive interaction between multiple hydrocarbon chains. (C) 2004 Elsevier Inc. All rights reserved., Aug. 2004, 276, 2, 450, 455, Scientific journal, 10.1016/j.jcis.2004.03.069
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Effect of pH on adsolubilization of single and binary organic solutes into a cationic hydrocarbon surfactant adsorbed layer on silica, N Okamoto; T Yoshimura; K Esumi, The adsolubilization behaviors of 2-naphthol, biphenyl, and their binary solutes in the hexadecyltrimethyl ammonium bromide (HTAB) adsorbed layer formed on silica have been studied with solution pH. Two feed concentrations of HTAB are employed: 1.5 and 3.0 mmol dm(-1). At the feed concentration of 1.5 mmol dm(-3) HTAB, most of HTAB are adsorbed on the silica as a monolayer, while a bilayer formation occurs at the feed concentration of 3.0 mmol dm-3. It is found that the adsolubilized amounts of respective single solutes increase with increasing solution pH except acidic region for biphenyl under a constant feed concentration of 2-naphthol (0.4 mmol dm(-3)) and biphenyl (0.047 mmol dm(-3)). The adsolubilization of binary solutes depends on the feed concentration of HTAB; at the low HTAB feed concentration, competitive adsolubilization between 2-naphthol and biphenyl occurs above pH 4.5, while at the high HTAB feed concentration the adsolubilization of biphenyl is enhanced by the incorporation of 2-naphthol over a whole pH region. These behaviors in the adsolubilization are discussed from the surfactant structure of HTAB adsorbed as well as the admicellar partitioning coefficients. (C) 2004 Elsevier Inc. All rights reserved., Jul. 2004, 275, 2, 612, 617, Scientific journal, 10.1016/j.jcis.2004.02.062
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Interactions of quaternary ammonium salt-type gemini surfactants with sodium poly(styrene sulfonate), T Yoshimura; Y Nagata; K Esumi, The interactions of cationic gemini surfactants, 1,2-bis(alkyldimethylammonio)ethane dibromide (m-2-m: m is hydrocarbon chain length, m = 10 and 12), and an anionic polymer, sodium poly(styrene sulfonate) (PSS), have been characterized by several techniques such as tensiometry, fluorescence spectroscopy, and dynamic light scattering. The surface tension of germini surfactant/PSS mixed systems decreases with surfactant concentration, reaching break points, which are taken as critical aggregation concentrations (cac). The surface tension at the cac of mixtures is higher than that of single surfactants, and it is found that at concentrations above the cac, the surfactant molecules are associated with the polymer in the bulk. The 12-2-12/PSS mixed system shows higher surface activity than both 10-2-10/PSS and the monomeric surfactant of dodecyltrimethylammonium bromide/PSS systems. Fluorescence measurements of these mixed systems suggest the formation of a complex with a highly hydrophobic environment in the bulk of the solution. Additionally, dynamic light scattering measurements show that the hydrodynamic diameter of the 12-2-12/PSS mixed system is smaller than that of PSS only at low concentration, indicating interactions between surfactant and polymer. These result from the electrostatic attraction between ammonium and sulfate headgroups as well as the hydrophobic interaction between their hydrocarbon chains. (C) 2004 Elsevier Inc. All rights reserved., Jul. 2004, 275, 2, 618, 622, Scientific journal, 10.1016/j.jcis.2004.03.002
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Synthesis of gold nanopartieles from an organometallic compound in supercritical carbon dioxide, K Esumi; S Sarashina; T Yoshimura, This article presents the synthesis of gold nanoparticles in a single-phase supercritical fluid carbon dioxide solvent. The gold nanoparticles were formed by the reduction of triphenylphosphine gold(I) perfluorooctanoate with dimethylamineborane. Transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis spectroscopy reveal the formation of gold nanoparticles of 1 nm in diameter. A high dispersion stability of the gold nanoparticles in supercritical carbon dioxide can be obtained by binding both triphenylphosphine and fluorocarbon ligands on the surface of the gold nanoparticles., Jun. 2004, 20, 13, 5189, 5191, Scientific journal, 10.1021/la049415e
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Adsolubilization of 2-Naphthol by Cationic Multi-Chained Surfactants at Silica/Water Interface, YOSHIMURA Tomokazu; K.Esumi; D.Tsurumi; T.Yoshimura, Adsolubilization of 2-naphthol by cationic multi-chained surfactants such as gemini (m-2-m, m=alkyl chain length; 10-2-10, 12-2-12) and trimeric surfactants (m-2-m-2-m; 10-2-10-2-10, 12-2-12-2-12) on silica has been investigated. For comparison, a similar experiment has been performed using a cationic single-chained surfactant, dodecyltrimethylammonium bromide (DTAB). Adsorption of the surfactants increases with an increase of the concentration and reaches a saturation, while adsolubilization of 2-naphthol increases and shows a maximum and then decreases with the surfactant concentration for all the surfactant systems. The ratio of maximum amount of 2-naphthol adsolubilized to the adsorbed amount of surfactant on silica is decreased as in the order, 10-2-10-2-10>>12-2-12-2-12>>12-2-12=DTAB>>10-2-10. In addition, the order of the ratio per one-hydrocarbon chain is 10-2-10-2-10 =12-2-12>>12-2-12-2-12=10-2-10, where the ratio of DTAB is considerably large compared to those of the multichained surfactants. These results can be interpreted by the compactness of surfactant adsorbed layer. The effect of the surfactant structure on the adsolubilization is also discussed using admicellar partitioning coefficients of 2-naphthol., May 2004, 77, 5, 207-212, 212, 10.4011/shikizai1937.77.207
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Mixed micellar properties of cationic trimeric-type quaternary ammonium salts and anionic sodium n-octyl sulfate surfactants, T Yoshimura; A Ohno; K Esumi, The properties of quaternary ammonium salt-type cationic trimeric surfactants (m-2-m-2-m, m represents the carbon atom number in alkyl chain lengths of 8, 10, and 12) and oppositely charged anionic monomeric surfactant, sodium n-octyl sulfate (SOS), were characterized by employing several techniques such as static surface tension, fluorescence spectroscopy, and dynamic light-scattering measurements. The critical micelle concentrations (cmc) of m-2-m-2-m were much lower than those of the corresponding dimeric and monomeric surfactants, and decreased with increasing chain length. The addition of SOS to m-2-m-2-m solutions resulted in a further decrease of the cmc. The mixed surfactants showed higher efficiencies in lowering the surface tension than the individual surfactants. The fluorescence measurements suggested the formation of mixed micelles with a hydrophobic environment in the solutions even at lower concentrations. The dynamic light-scatteting stud), indicated the presence of two different kinds of aggregates with different hydrodynamic diameters. The larger one was attributed to the mixed micelle of m-2-m-2-m and SOS. These results indicated a decline of the electrostatic repulsion between cationic head groups through the incorporation of anionic surfactant into the mixed surfactants. (C) 2004 Elsevier Inc. All rights reserved., Apr. 2004, 272, 1, 191, 196, Scientific journal, 10.1016/j.jcis.2003.12.021
  • Refereed, 色材協会誌, 新規Gemini型およびTrimeric型界面活性剤の特性(総説), YOSHIMURA Tomokazu, Apr. 2004, 77, 4, 177-183
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Antioxidant action by gold-PAMAM dendrimer nanocomposites, K Esumi; H Houdatsu; T Yoshimura, Gold-dendrimer nanocomposites were prepared in the presence of poly(amidoamine) (PAMAM)dendrimer (generation 3, 3.5, 5, and 5.5) via reduction of HAuCl4 with sodium borohydride. The average particle size of the gold nanoparticles was independent of the dendrimer concentration, ranging between 3.0 and 4.3 nm in diameter. The catalytic activities of the gold-dendrimer nanocomposites upon elimination of hydroxyl radicals formed in an H2O2/FeSO4 system were examined using a spin-trapping method. The gold-dendrimer nanocomposites exhibited high catalytic activities which were hardly affected by the concentration and the generation of the dendrimer except PAMAM dendrimer 3.5. The highest activity for the gold-PAMAM dendrimer 3.5 nanocomposites was 85 times that of ascorbic acid., Mar. 2004, 20, 7, 2536, 2538, Scientific journal, 10.1021/la036299r
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Binary Adsolubilized of Organic Compounds in a Fluorocarbon Surfactant Adsorbed Layer Formed on Titanium Dioxide, YOSHIMURA Tomokazu; K.Esumi; S.Nakagawa; T.Yoshimura, The binary adsolubilization behaviors of 2-naphthol +biphenyl and 2-naphthol +1, 3-dichlorobenzene in a cationic fluorocarbon surfactant adsorbed layer formed on TiO2 have been investigated as a function of pH. In the binary adsolubilization of 2-naphthol+biphenyl, the adsolubilized amount of 2-naphthol increases gradually until pH 7 and then sharply with a further increase of pH, whereas the adsolubilization of biphenyl is not observed in the wide pH region. In the binary adsolubilization of 2-naphthol +1, 3-dichlorobenzene, the adsolubilization behavior of 2-naphthol shows a similar trend as that of 2-naphthol +biphenyl system, while the adsolubilized amount of 1, 3-dichlorobenzene increases gradually with pH from 3 to 10. The enhancement in the adsolubilization of 2-naphthol at high pH is attributed to the interaction between deprotonated 2-naphthol and the cationic surfactant as well as the increase of interaction between negatively charged TiO2 and the surfactant. The adsolubilized sites for binary adsolubilization of 2-naphthol +1, 3-dichlorobenzene are also discussed from the admicellar partitioning coefficients., Jan. 2004, 77, 1, 13-18, 18, 10.4011/shikizai1937.77.13
  • Refereed, JOURNAL OF SURFACTANTS AND DETERGENTS, AMER OIL CHEMISTS SOC A O C S PRESS, Synthesis and surface-active properties of trimeric-type anionic surfactants derived from tris(2-aminoethyl)amine, T Yoshimura; N Kimura; E Onitsuka; H Shosenji; K Esumi, Trimeric-type anionic surfactants (3C(n)taAm, where n is a hydrocarbon chain length of 8, 10, or 12) with three hydrocarbon chains and three carboxylate headgroups were synthesized from tris(2-aminoethyl)amine, and their properties were investigated by surface tension, electrical conductivity, dynamic and static light-scattering, fluorescence of pyrene, and emulsification power techniques. The critical micelle concentrations (CMC) of 3C(n)taAm were 0.00092-0.00834 mmol dm(-3), and the surface tensions at the CMC were 33.3-39.9 mN m(-1). The areas per molecule occupied by 3C(10)taAm and 3C(12)taAm were extremely small, showing they were highly compact at the air/water interface. In addition, adsorption or micellization behavior of 3C(n)taAm was estimated by parameters such as pC(20) (the efficiency of surface adsorption), CMC/C-20 (the ease of adsorption relative to the ease of micellization), and DeltaG(M)(o) (Gibbs energy of micellization). Dynamic and static light-scattering measurements of 3C(n)taAm showed a hydrodynamic radius of 45-61 nm above the CMC and aggregation numbers of 10-82 at the CMC, respectively. The fluorescence intensity ratio of the first to the third band in the emission spectra of pyrene started to lower from far above the CMC for 3C(8)taAm and 3C(10)taAm, and below the CMC for 3C(12)taAm. This suggests that loose micelles or premicellar aggregates are formed in solutions. Mixtures of aqueous solutions of 3C(n)taAm and toluene formed oil-in-water-type emulsions, and the stabilizing abilities were in the order of 3C(8)taAm > 3C(10)taAm > 3C(12)taAm. The degree of emulsification of 3C(8)taAm remained at 69% after 24 h of standing. Thus, 3C(n)taAm exhibited unique properties superior to monomeric or dimeric surfactants that were significantly influenced by their hydrocarbon chain lengths., Jan. 2004, 7, 1, 67, 74, Scientific journal
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Adsorption characteristics of poly(amidoamine) and poly (propylene imine) dendrimers on gold, K Esumi; M Ichikawa; T Yoshimura, The adsorption of poly(amidoamine) (PAMAM) and poly(propylene imine) (PPI) dendrimers having different generations from their aqueous solutions on gold electrode has been investigated using a 27 MHz quartz crystal microbalance. The adsorption of PAMAM dendrimers (generation G = 3, 4, and 5) depends on the generation, whereas that of PPI dendrimers (G = 2, 3, and 4) is almost independent on the generation. The occupied area by the dendrimers adsorbed suggests a formation of multilayer of the dendrimers where the number of the layer for PAMAM dendrimers is larger than that for PPI dendrimers. The mechanism for the formation of multilayer is also discussed. (C) 2003 Elsevier B.V. All rights reserved., Jan. 2004, 232, 2-3, 249, 252, Scientific journal, 10.1016/j.colsurfa.2003.11.006
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Preparation of PAMAM- and PPI-metal (silver, platinum, and palladium) nanocomposites and their catalytic activities for reduction of 4-nitrophenol, K Esumi; R Isono; T Yoshimura, Dendrimer-metal (silver, platinum, and palladium) nanocomposites are prepared in aqueous solutions containing poly(amidoamine) (PAMAM) dendrimers with surface amino groups (generations 3, 4, and 5) or poly(propyleneimine) (PPI) dendrimers with surface amino groups (generations 2, 3, and 4). The particle sizes of the metal nanoparticles obtained are almost independent of the generation as well as the concentration of the dendrimer for both the PAMAM and the PPI dendrimers; the average sizes of silver, platinum, and palladium nanoparticles are 5.6-7.5, 1.2-1.6, and 1.6-2.0 nm, respectively. It is suggested that the dendrimer-metal nanocomposites are formed by adsorbing the dendrimers on the metal nanoparticles. Studies of the reduction reaction of 4-nitrophenol by these nanocomposites show that the rate constants are very similar between PAMAM and PPI dendrimer-silver nanocomposites, whereas the rate constants for the PPI dendrimer-platinum and -palladium nanocomposites are greater than those for the corresponding PAMAM dendrimer nanocomposites. In addition, it is found that the rate constants for the reduction of 4-nitrophenol involving all the dendrimer-metal nanocomposites decrease with an increase in the dendrimer concentrations, and the catalytic activity of dendrimer-palladium nanocomposites is highest., Jan. 2004, 20, 1, 237, 243, Scientific journal
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Preparation of Gold-Poly(propylene imine)Dendrimer Nanocomposites with UV Irradiation, YOSHIMURA Tomokazu; K.Esumi; Y.Seto; T.Yoshimura, Gold nanoparticles were prepared in the presence of poly (propylene imine) dendrimers (PPI) (generation 2, 3, and 4) with surface amino groups by UV-irradiation. UV-vis absorption, dynamic light scattering, and transmission electron microscopy have been used to study the formation and structure of gold-PPI nanocomposites. The reduction of Au3+ ions proceeded with an increase of UV irradiation time and the average diameters of gold nanoparticles obtained increased with an increase of dendrimer concentration. It is suggested that the structure of gold-PPI nanocomposites is formed by adsorption of PPI dendrimers on the gold nanoparticles. In addition, studies of reduction reaction of 4-nitrophenol by the gold nanoparticles with NaBH4 show that the rate constants are very similar even for different generations as well as the different concentrations of PPI dendrimers., Dec. 2003, 76, 12, 463-468, 468, 10.4011/shikizai1937.76.463
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Morphological change of gold-dendrimer nanocomposites by laser irradiation, K Esumi; K Hayakawa; T Yoshimura, Gold-dendrimer nanocomposites are prepared in aqueous solutions in the presence of poly(amidoamine)dendrimers (PAMAM) (generation 3 and 5) or poly(propyleneimine)dendrimers (PPI) (generation 3 and 4) by wet chemical NaBH4 method. Thus prepared gold-dendrimer nanocomposites are irradiated by laser at 532 nm. UV-vis absorption spectroscopy and transmission electron microscopy reveal that the gold nanoparticles grow with the laser irradiation time as well as the fluence of the laser; in particular, the gold nanoparticles prepared at lower concentrations of PAMAM dendrimer as well as lower generations of PAMAM grow significantly. On the other hand, in the case of PPI dendrimers, the gold nanoparticles hardly grow by irradiation. In addition, dynamic light-scattering measurements show that the laser irradiation markedly promotes the association of the gold-PAMAM G3 dendrimer nanocomposites compared to that of the gold-PAMAM G5 dendrimer nanocomposites, while the sizes of association for the gold-PPI G3, G4 dendrimer nanocomposites hardly change by laser irradiation. (C) 2003 Elsevier Inc. All rights reserved., Dec. 2003, 268, 2, 501, 506, Scientific journal, 10.1016/S0021-9797(03)00598-8
  • Refereed, Journal of the Japan Society of Colour Material, Japan Society of Colour Material, 表面間力測定による分子吸着層のナノ構造評価(総説), YOSHIMURA Tomokazu, Dec. 2003, 76, 12, 495-502, 502, 10.4011/shikizai1937.76.495
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Physicochemical properties of quaternary ammonium bromide-type trimeric surfactants, T Yoshimura; H Yoshida; A Ohno; K Esumi, Trimeric surfactants of quaternary ammonium bromide (m-2-m-2-m, where m is the hydrocarbon chain length of 8, 10, or 12) with three hydrocarbon chains and three hydrophilic groups connected by two ethylene spacer chains were synthesized by the reaction of N, N, N', N",N"-pentamethyldiethylenetriamine and the corresponding alkyl bromide. Their physicochemical properties were characterized by surface tension. static and dynamic light-scattering, and fluorescence spectrum of pyrene techniques. The critical micelle concentrations (cmc's) of m-2-m-2-m shifted to lower concentrations with increasing hydrocarbon chain length, and their values were smaller by about one to three orders of magnitude than those of the corresponding dimeric (m-2-m) and monomeric surfactants (C(m)TAB) with the same hydrocarbon chain length. Of these surfactants, 10-2-10-2-10 showed the greatest efficiency in lowering the surface tension and provided the smallest occupied area per molecule, indicating that it adsorbs more compactly at the air/water interface. In addition, from the static and dynamic light-scattering measurements, the aggregation numbers of the trimeric surfactants at the cmc were very small, and two hydrodynamic diameters above the cmc were observed. (C) 2003 Elsevier Inc. All rights reserved., Nov. 2003, 267, 1, 167, 172, Scientific journal, 10.1016/S0021-9797(03)00694-5
  • Refereed, JOURNAL OF PHYSICAL CHEMISTRY B, AMER CHEMICAL SOC, Interaction forces on alpha-alumina surfaces with coadsorption of anionic/nonionic surfactant mixtures, K Sakai; T Yoshimura; K Esumi, Direct measurement of interaction forces between a-alumina surfaces with coadsorbed anionic sodium dodecyl sulfate (SDS) and nonionic hexaoxyethylenedodecyl ether (C12E6) at pH 3.5 is carried out by colloidal probe atomic force microscopy. The strength of interaction forces is found to be dependent on the initial SDS concentrations, whereas the addition of C12E6 alone causes negligible effects on the interaction. This is due to the absence of attractive interactions between C12E6 molecules and a-alumina. On the other hand, the interaction forces are remarkably different for the simultaneous addition of the two surfactants. At lower C12E6 concentrations the observed repulsion induced by the electric double layer is larger than that in the corresponding single SDS solution, suggesting the stronger SDS adsorption as a consequence of the reduction of the electrostatic repulsion between the ionic headgroups of SDS admicelles. By the further addition of C12E6 a steric stabilizing force is detected from the separation of approximately 5 nm. This is attributed to the formation of a closely packed adlayer comparing with the case of the single SDS admicelles. The effects of sequential addition of C12E6 to the alpha-alumina preadsorbed hydrophobically with SDS are also investigated to understand the complex phenomena that occur at the interface., Nov. 2003, 107, 44, 12227, 12232, Scientific journal, 10.1021/jp0350161
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Preparation of Silver-, Platinum-, and Palladium-PAMAM Dendrimer Nanocomposites and Their Catalytic Activities for Reduction of 4-Nitrophenol, YOSHIMURA Tomokazu; K.Esumi; R.Isono; T.Yoshimura, Metal (silver, platinum, and palladium) -dendrimer nanocomposites are prepared in aqueous solutions by using poly (amidoamine) (PAMAM) dendrimers (generation ; 1.5, 3.0, 3.5, 4.0, 5.0 and 5.5) with carboxyl or amino terminal groups, and their average particle diameters are 5-7 nm for silver, 1-2 nm for platinum, and about 2 nm for palladium depending on the concentration of the dendrimers, but not the generation of the dendrimers. In particular, stable metal-dendrimer nanocomposites are obtained at lower dendrimer concentrations using the dendrimers with carboxyl terminal groups compared to those with amino terminal groups. It is suggested that the metal-dendrimer nanocomposites are formed by adsorbing dendrimer molecules on the metal nanoparticles. Studies of catalytic reduction of 4-nitrophenol by the metal-dendrimer nanocomposites with sodium borohydride reveal that the rate constant depends on the concentration of the dendrimers added as well as the generation of the dendrimers. Furthermore, the rate constants are found to be dependent on the type of terminal groups. Among three metaldendrimer nanocomposites, palladium-dendrimer nanocomposites are also found to be most efficient catalysts for the reduction of 4-nitrophenol with sodium borohydride., Nov. 2003, 76, 11, 421-427, 427, 10.4011/shikizai1937.76.421
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Interactions Between Thiol-Modified Gold Nanoparticles and a Cationic Polyelectrolyte, YOSHIMURA Tomokazu; S.Kuniyasu; T.Yoshimura; K.Esumi, The interactions between gold nanoparticles modified with mercaptoacetate and a cationic polyelectrolyte, poly (dimethyldiallylammonium chloride) (PDC) have been investigated. As a comparison, a system containing the modified gold nanoparticles and a cationic surfactant, hexadecyltrimethylammonium bromide (HTAB) is also studied. The average sizes of the modified gold nanoparticles used are 5.7 and 12.9 nm, respectively. Most of experiments have been performed under a fixed concentration of the modified gold nanoparticles with various PDC concentrations at pH 3 and 8. UV-vis spectroscopy and transmission electron spectroscopy reveal that at pH 8, the modified gold nanoparticles with small size are gradually aggregated with an increase of PDC concentration, whereas those with large size are aggregated at low PDC concentration, but at higher PDC concentration the gold nanoparticles are well separated. At pH 3, the modified gold nanoparticles for both sizes show a dispersion-flocculationredispersion sequence. These interactions are predominantly induced by the electrostatic attractions between negatively charged nanoparticles and positively charged PDC which are affected by pH. In the case of the modified gold nanoparticles-HTAB system, the modified gold nanoparticles show a dispersion-flocculation-redispersion sequence. The redispersion occurs by the formation of HTAB bilayer on the nanoparticles., Nov. 2003, 76, 11, 428-433, 433, 10.4011/shikizai1937.76.428
  • Refereed, COLLOIDS AND SURFACES B-BIOINTERFACES, ELSEVIER SCIENCE BV, Antioxidant-potentiality of gold-chitosan nanocomposites, K Esumi; N Takei; T Yoshimura, Gold nanoparticles were prepared in the presence of chitosan via reduction of HAuCl4 with sodium borohydride. The average particle size of gold nanoparticles was significantly affected with the concentration of chitosan added and was ranged between 6 and 16 nm. The gold-chitosan nanocomposites are formed by adsorbing chitosan molecules on the gold nanoparticles. The catalytic activity of gold-chitosan nanocomposites upon elimination of hydroxyl radicals formed in an H2O2/FeSO4 system was examined using a spin-trapping method. The catalytic activity increased with the concentration of chitosan added and showed a maximum and then decreased with a further concentration of chitosan added, although a strict correlation between the average diameter of gold and the catalytic activity was not found. In addition, the activity of gold-chitosan was 80 times higher than that of ascorbic acid, which is well known as an antioxidant. (C) 2003 Elsevier B.V. All rights reserved., Oct. 2003, 32, 2, 117, 123, Scientific journal, 10.1016/S0927-7765(03)00151-6
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Multilayer formation using oppositely charged gold- and silver-dendrimer nanocomposites, K Esumi; S Akiyama; T Yoshimura, Sep. 2003, 19, 18, 7679, 7681, Scientific journal, 10.1021/la034777s
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Preparation of gold-dendrimer nanocomposites by laser irradiation and their catalytic reduction of 4-nitrophenol, K Hayakawa; T Yoshimura; K Esumi, Gold nanoparticles were prepared in the presence of poly(amidoamine) (PAMAM) dendrimers (generations 3.0 and 5.0) or poly(propyleneimine) (PPI) dendrimers (generations 3.0 and 4.0) with surface amino groups by laser irradiation. UV-visible absorption, dynamic light scattering, and transmission electron microscopy have been used to study the formation and structure of the nanocomposites. The reduction of Au(3+) ions proceeded with an increase of the irradiation time, and the average diameters of the gold nanoparticles obtained tended to decrease with an increase of the dendrimer concentration. It is suggested that the dendrimers are adsorbed on the nanoparticles as a monolayer. Studies of the reduction reaction of 4-nitrophenol by the gold nanoparticles with NaBH(4) reveal that the rate constants for PPI dendrimers are higher than those for PAMAM dendrimers, whereas the size of the PPI dendrimer of the same generation is considerably smaller than that of the PAMAM dendrimer., Jun. 2003, 19, 13, 5517, 5521, Scientific journal, 10.1021/1a0343391
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Physicochemical properties of ring-type trimeric surfactants from cyanuric chloride, T Yoshimura; K Esumi, Apr. 2003, 19, 8, 3535, 3538, Scientific journal, 10.1021/la026762k
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Physicochemical properties of aqueous mixed solutions of sugar-persubstituted poly(amidoamine)dendrimers and bovine serum albumin, T Chiba; T Yoshimura; K Esumi, The interactions of bovine serum albumin (BSA) with sugar-persubstituted poly(amidoamine)dendrimers (SB, generation 3 and 5) have been studied using several techniques including interfacial rheometer. The sample solutions are prepared by mixing SB5 or SB3 to BSA under a fixed concentration of BSA. In BSA-SB5 system, mixed solutions become turbid due to the formation of aggregates between BSA and SB5 by adding a small amount of SB5, but a further addition of SB5 renders the aggregates redispersed. These results are reflected in the changes of surface tension, interfacial rheology, and circular dichroism (CD) spectra for BSA-SB5 system. On the other hand, BSA-SB3 system does not show significant physicochemical properties due to a weak interaction between BSA and SB3. (C) 2002 Elsevier Science B.V. All rights reserved., Mar. 2003, 214, 1-3, 157, 165, Scientific journal
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Interactions of fluorocarbon-modified poly(acrylic acid) with a cationic fluorocarbon surfactant, F Kobayashi; T Yoshimura; K Esumi, The physicochemical properties of mixed systems of fluorocarbon-modified poly(acrylic acid) (FA) with a cationic fluorocarbon surfactant, bis(2-hydroxyethyl)(2-hydroxy-3-perfluoro-octylpropyl)methylammonium chloride (DEFUMAC), have been investigated by surface tension, fluorescence, solubility, and F-19 NMR spin-lattice relaxation measurements. The result obtained from the surface tension measurement indicates that surface DEFUMAC-FA complexes are formed by strong electrostatic attraction at pH 10, while they are formed by hydrogen bond at pH 4. However, hydrophobic interaction is hardly observed at both pHs. In the bulk properties estimated from fluorescence and solubility measurements, DEFUMAC-FA complexes exhibit large solubility capacity for fluorocarbon compounds when the content of fluorocarbon in FA increases. Moreover, the result obtained from the spin-lattice relaxation time measurement suggests that the mobility of hydrophobic end group of DEFUMAC for DEFUMAC-FA complex at pH 10 is more restricted than that at pH 4. (C) 2002 Elsevier Science B.V. All rights reserved., Mar. 2003, 214, 1-3, 271, 278, Scientific journal
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Preparation of noble metal nanoparticles in supercritical carbon dioxide, A Kameo; T Yoshimura; K Esumi, Silver, palladium, and silver-palladium nanoparticles have been prepared by reduction of silver acetylacetonate and palladium acetate with dimethylamine-borane in the presence of a fluorinated surfactant (FOMBLIN HC/P2-1000) in supercritical carbon dioxide. The sizes of silver and palladium nanoparticles increases with increasing concentrations of both the soluble precursors and FOMBLIN. The size of silver nanoparticles obtained is 3-12 nm, while that of palladium nanoparticles is 3-6 nm. For preparation of silver-palladium nanoparticles, the particle size is ranged between 4 and 5 nm and dependent on the feed molar ratio of palladium acetate. It is found that silver-palladium nanoparticles consist of a core-shell structure with enriched palladium in the surface. (C) 2002 Elsevier Science B.V. All rights reserved., Mar. 2003, 215, 1-3, 181, 189, Scientific journal
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Direct force measurements between alpha-alumina surfaces with adsorption of anionic surfactant/polymer mixtures, K Sakai; T Yoshimura; K Esumi, Direct measurements of interaction forces between alpha-alumina surfaces with coadsorbed anionic surfactant sodium dodecyl sulfate (SDS) and anionic polyelectrolyte poly(sodium 4-styrenesulfonate) (PSS) at pH 3.5 are carried out by colloidal probe atomic force microscopy. It is found that in aqueous PSS solutions the interaction forces are dependent on the initial PSS concentration. At low PSS concentration the electrostatic repulsion initially present is neutralized, resulting in a weak attraction between the surfaces, while as the concentration is increased further, repulsive forces reappear due to the additional adsorption of PSS on the surface. The adsorbed PSS adopts a relatively flat conformation at all PSS concentrations investigated. On the other hand, the interaction forces are dramatically different for the simultaneous addition of SDS and PSS: the force profile for the coaddition comes progressively close to that for the addition of SDS alone with increasing SDS concentration. This is attributed to the fact that SDS plays a key role for the coadsorption of SDS and PSS over a high SDS concentration region. The dispersion stability and zeta potential of alpha-alumina suspensions are evaluated for comparison with the resultant forces, and a good correlation is obtained between them. The effects of sequential addition of SDS and PSS are also investigated., Feb. 2003, 19, 4, 1203, 1208, Scientific journal, 10.1021/la026388o
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Preparation of Gold Nanoparticles Using Poly(amidoamine)Dendrimers as Stabilizer and Their Catalytic Reduction of 4-Nitrophenol, YOSHIMURA Tomokazu; K.Esumi; K.Miyamoto; T.Yoshimura, Gold nanoparticles are prepared in aqueous solutions by using poly (amidoamine) (PAMAM) dendrimers (generation 3.0, 3.5, 5.0 and 5.5) with various terminal groups such as methyl ester, amino, carboxyl, or sugar residue, and their mean particle sizes are 2-6 nm in diameter depending on the dendrimer/Au+3 ratio as well as the generation of PAMAM dendrimers. Studies of reduction reaction of 4-nitrophenol by gold nanoparticles with NaBH4 reveal that the rate constant depends on the concentration of the dendrimers added as well as the generation of the dendrimers. Furthermore, the effect on the rate constants for PAMAM (generation 5.0 and 5.5) with various terminal groups follows the order : carboxyl ≥ amino > sugar residue > methyl ester. These results are attributed to the dendrimer-gold nanocomposite structures, depending on whether the gold nanoparticles are formed inside or outside the dendrimers., Dec. 2002, 75, 12, 561-567, 567, 10.4011/shikizai1937.75.561
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Effects of various thiol molecules added on morphology of dendrimer-gold nanocomposites, K Satoh; T Yoshimura; K Esumi, Interactions between poly(amidoamine) dendrimer (PAMAM)gold nanocomposites and alkanethiols and between the former nanocomposites and thiol-modified poly(amidoamine) dendrons in ethyl acetate were investigated by adding alkanethiols, such as 1-propanethiol and 1,3-propanedithiol, and thiol-modified poly(amidoamine) dendrons, generations 0.5 and 2.5 (G0.5-SH and G2.5-SH). The PAMAM dendrimers with surface methyl ester groups used were generations 1.5 and 5.5 (G1.5 and G5.5). The mean particle sizes of PAMAM-gold nanocomposites were about 2.1 for G1.5 and 2.4 nm for G5.5. In both nanocomposite systems where 1-propanethiol and 1,3-propanedithiol were added, the mean particle size was about 4 run, twice that of the systems where these thiols were not added. Increasing the addition of 1,3-propanedithiol made the average particle size smaller for both nanocomposites systems. To compare with alkanethiol, thiol-modified poly(amidoamine) dendron with a highly branched structure on one side was synthesized. Using G2.5-SH as a protective agent, dendron-gold nanocomposites with mean diameters of 3 to 4 nm were obtained. The difference in particle size was seen only when the combination of PAMAM-gold nanocomposites and thiol-modified dendron was less sterically dense, modified dendron (G0.5-SH). The mechanisms for morphology changes in the dendrimer-gold nanocomposites by the addition of these thiols are discussed. (C) 2002 Elsevier Science (USA)., Nov. 2002, 255, 2, 312, 322, Scientific journal, 10.1006/jcis.2002.8585
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Physicochemical properties of quaternized poly(amidoamine) dendrimers with four octyl chains, T Yoshimura; J Fukai; H Mizutani; K Esumi, A cationic dendrimer-type tetrameric surfactant (C(8)qbG0) with four octyl chains and four ammonium groups was synthesized by the reaction of poly(amidoamine) dendrimers with generation of zero and glycidyldimethyloctylammonium bromide. The physicochemical properties Of C(8)qbG0 and of their mixtures with sodium dodecyl sulfate (SDS) were characterized by investigating surface tension, electrical conductivity, fluorescence of pyrene, and dynamic light-scattering. The critical micelle concentration (cmc) Of C(8)qbG0 was 13 mmol dm(-3) at the concentration of one terminal group and the surface tension at the cmc attained 34 mN m(-1). The occupied area of C(8)qbG0 was 1.94 nm(2) molecule(-1), indicating that the tetrameric dendrimers adsorb widely at the air/water interface. The fluorescence intensity ratio of the first-to-third band in the emission spectra of pyrene for C(8)qbG0 decreased from around the cmc obtained by the surface tension measurement. The hydrodynamic radius of C(8)qbG0 determined by dynamic light-scattering was about 1.3 nm. The addition of SDS to the aqueous solutions Of C(8)qbG0 enhanced the surface activities; the mixtures exhibited lower cmc, lower surface tension, and higher solubilization of pyrene than SDS alone. It was found that the mixtures Of C(8)qbG0 and SDS form large aggregates due to the interactions between their alkyl chains as well as hydrophilic groups. (C) 2002 Elsevier Science (USA)., Nov. 2002, 255, 2, 428, 431, Scientific journal, 10.1006/jcis.2002.8626
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Highly Efficient Adsolubilization of 2-Naphthol on Alumina by Anionic and Nonionic Surfactant Mixtures, YOSHIMURA Tomokazu; K.Esumi; N.Okamoto; T.Yoshimura, The adsolubilization of 2-naphthol by mixtures of an anionic surfactant, sodium dodecyl sulfate (SDS), and nonionic surfactants, hexaoxyethylenedecyl ether (C10E6), and hexaoxyethylenedodecyl ether (C12E6) on alumina was investigated. Adsorption and adsolubilization were performed using a feed concentration of SDS under various fixed concentrations of the nonionic surfactants. The adsolubilization of 2-naphthol increased with an increase of the fixed nonionic surfactant concentration, showed a maximum and then decreased with a further increase of nonionic surfactant concentration for both SDS/C10E6 and SDS/C12E6 systems. The adsolubilization of 2-naphthol was greater for SDS/C10E6 and SDS/C12E6 systems than that for SDS single system. Furthermore, the adsolubilization efficiency defined by ratio of 2-naphthol adsolubilized to total surfactant adsorbed amount was higher for SDS/C12E6 system than that for SDS/C10E6 system at the maximum adsolubilization. This difference in the efficiency between SDS/C10E6 and SDS/C12E6 systems is attributed to the properties of the mixed-surfactant adsorbed layer which are affected by the hydrocarbon chain lengths of nonionic surfactants., Nov. 2002, 75, 11, 513-518, 518, 10.4011/shikizai1937.75.513
  • Refereed, J. Jpn. Soc. Colour Mater., Japan Society of Colour Material, Preparation of PAMAM Dendrimer-Gold Nanocomposites in Poly(N-isopropylacrylamide)Gel, YOSHIMURA Tomokazu; K.Esumi; S.Sarashina; T.Yoshimura, Gold nanoparticles were prepared in poly (amidoamine) dendrimers-poly (N-isopropylacrylamide) gel matrix. Three dendrimers used were generation 5 with surface amino group, generation 5.5 with surface methyl ester group, and generation 5.5 with surface carboxyl group. In the cases of dendrimers with surface amino group and surface methyl ester group, gold nanoparticles having diameter of 3-4 nm were obtained and their size distribution was relatively narrow. However, in the case of dendrimer with surface carboxyl group, gold nanoparticles with much larger size and wider size distribution were obtained. The role of dendrimers in the gel matrix for formation of gold nanoparticles was discussed., Oct. 2002, 75, 10, 470-473, 473, 10.4011/shikizai1937.75.470
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Comparison of PAMAM-Au and PPI-Au nanocomposites and their catalytic activity for reduction of 4-nitrophenol, K Esumi; K Miyamoto; T Yoshimura, Dendrimer-Au nanocomposites are prepared in aqueous solutions using poly(amidoammine)dendrimers (PAMAM) (generation 2, 3, and 5) and poly(propyleneimine)dendrimers (PPI)(generation 2, 3, and 4) by wet chemical NaBH4 method. The Au nanoparticles thus obtained are 2-4 nm in diameter for both dendrimers and no generation dependence on the particle size is observed, whereas the generations of the dendrimers are increased as stabilization of Au-nanoparticles is achieved with lower dendrimer concentrations. Studies of the reduction reaction of 4-nitrophenol using these nanocomposites show that the rate constants for the PAMAM dendrimers (generations 2 and 3) are higher than those for the PPI dendrimers (generations 2 and 3), while a distinct difference in the rate constants is not seen for the PAMAM dendrimer (generation 5) or the PPI dendrimer (generation 4). In addition, the rate constants for the reduction of 4-nitrophenol involving all the dendrimers decrease with increases in dendrimer concentrations. (C) 2002 Elsevier Science (USA)., Oct. 2002, 254, 2, 402, 405, Scientific journal, 10.1006/jcis.2002.8580
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Direct force measurements between adlayers consisting of poly(amidoamine) dendrimers with primary amino groups or quaternary ammonium groups, K Sakai; S Sadayama; T Yoshimura; K Esumi, Adsorption of poly(amidoamine) generation 3 (PAMAM G3) dendrimer with surface amino groups or PAMAM GO dendrimer with quaternary ammonium groups (C8qbG0) onto glass has been studied by colloidal probe atomic force microscopy. The adlayer-adlayer interactions for these adsorbates are quite different despite the fact that they are almost equal in the hydrodynamic radius. In aqueous PAMAM G3 dendrimer solutions the electrostatic repulsion is predominant. The conformation of the adsorbed layer is flat and the protrusion of the individual dendrimers is negligible. On the other hand, C8qbG0 behaves as a surfactant and the layered structure of C8qbG0 is expected to be a patchy bilayer. Dispersion stability of silica suspensions with the adsorption of these dendrimers can be correlated with the force data obtained. (C) 2002 Elsevier Science (USA)., Oct. 2002, 254, 2, 406, 409, Scientific journal, 10.1006/jcis.2002.8601
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Simultaneous adsorption of poly(1-vinylpyrrolidone-co-acrylic acid) and sodium dodecyl sulfate at alumina/water interface, K Sakagami; T Yoshimura; K Esumi, The simultaneous adsorption of poly(1-vinylpyrrolidone-co-acrylic acid) (PVcA) and sodium dodecyl sulfate (SDS) on positively charged alumina particles is carried out at pH 5.2 by measuring the amount of PVcA and SDS adsorbed, zeta potential, and sedimentation rate of alumina suspensions. In addition, conformation of PVcA and SDS adsorbed using their corresponding spin-labeled ones is estimated. The amount of PVcA adsorbed increases sharply and becomes a plateau with an increase of PVcA concentration, while a typical adsorption isotherm of SDS is obtained. In the simultaneous adsorption of PVcA and SDS under fixed initial concentrations of PVcA, the amount of PVcA adsorbed increases and reaches a maximum, and then decreases with SDS concentration. The enhancement in the adsorption is due to the interaction between SDS and PVcA as confirmed by surface tensiometry. The dispersion stability of alumina suspensions by the simultaneous adsorption of PVcA and SDS is considerably high compared with that by SDS adsorption alone. The high dispersion stability is due to the extended conformation of the adsorbed PVcA and the electrostatic repulsion force. Further, the mobility of SDS molecules in the PVcA-SDS adsorbed layer is found to be more restricted than that in the SDS adsorbed layer alone., Aug. 2002, 18, 16, 6049, 6053, Scientific journal, 10.1021/la0257236
  • Refereed, JOURNAL OF SURFACTANTS AND DETERGENTS, AMER OIL CHEMISTS SOC A O C S PRESS, Preparation and surface-active properties of telomer-type anionic surfactants from maleic anhydride, T Yoshimura; Y Koide; H Shosenji; K Esumi, Maleic acid alkyl ester and N-alkyl maleamic acid monomers (R(n)Ma and R(n)MaAm; n is alkyl chain length; n = 6, 8, 10, 12, 14) were synthesized by the reaction of maleic anhydride with alkyl alcohol or alkylamine. The telomerization of R(n)Ma or R(n)MaAm in the presence of alkanethiol as a chain transfer agent gave telomer-type anionic surfactants (xR(n)Ma, xR(n)MaAm; x is total average number of alkyl chains; x = 2.8-3.3) having multialkyl chains and multicarboxylate groups. Their surface-active properties were investigated by several techniques such as surface tension, foaming property, and emulsification power measurements. Critical micelle concentrations (CIVIC) of xRnMa were 1/110-1/14 of those of RnMa with the same alkyl chain length. xRnMa and xRnMaAm gave higher efficiencies in lowering the surface tension than RnMa and RnMaAnn in aqueous solutions. In particular, the surface tension of 3.2R(12)MaAm was 24.4 mN m(-1) at the CMC. Foaming abilities and foam stabilities of xR(n)Ma and xR(n)MaAm were higher than those of R(n)Ma and R(n)MaAm. The addition of 300 ppm of Ca2+ to the aqueous solutions rendered the telomers less surface active. Shaking the aqueous solutions of telomers with toluene emulsified them. The highly stable oil-in-water type emulsion was formed by using 3.0R(10)MaAm and 3.2R(12)MaAm, and the degree of emulsification was kept at a level of about 80% after 60 min of standing. Thus, telomer-type surfactants showed excellent surface activities that were superior to the corresponding monomers as well as to conventional surfactants. The relationship between alkyl chain length of the telomers and the properties of surface tension, foaming, and emulsification was unclear., Jul. 2002, 5, 3, 257, 262, Scientific journal
  • Refereed, LANGMUIR, AMER CHEMICAL SOC, Interaction forces on alpha-alumina surfaces with coadsorbed anionic surfactant and nonionic polymer, K Sakai; T Yoshimura; K Esumi, Direct measurements of interaction forces between a-alumina surfaces with coadsorbed anionic surfactant (sodium dodecyl sulfate (SDS) or lithium perfluorooctanesulfonate (LiFOS)) and nonionic polymer poly(vinylpyrrolidone) (PVP) at pH 3.5 are carried out by colloidal probe atomic force microscopy. In aqueous SDS solutions, the strength of interaction forces is found to depend on the initial SDS concentration, whereas in PVP solutions, the electric double layer interaction is completely screened due to the flat conformation of PVP on alpha-alumina. The interaction forces are dramatically different for the coaddition of SDS and PVP: electrostatic repulsion is observed above the critical aggregation concentration, and virtually no steric hindrance due to adsorbed polymer chains can be detected. These coaddition effects are attributed to the flat conformation of the adsorbed PVP and the formation of SDS-PVP surface complexes as confirmed by surface tensiometry. The LiFOS-PVP system exhibits characteristics similar to those of the SDS-PVP system, except that the repulsion between adsorbed LiFOS layers is remarkably weak at concentrations above its critical micelle concentration. The effects of sequential addition of SDS and PVP are also investigated., May 2002, 18, 10, 3993, 3998, Scientific journal, 10.1021/la011786x
  • Refereed, Journal of Oleo Science, Surface Activities of Mixtures of Partially-Quaternized 2-Vinylpyridine Telomers and Cationic Gemini Surfactant, Tomokazu Yoshimura; Kosuke Kawashima; Yoshifumi Koide; Hideto Shosenji; Kunio Esumi, The surface activities of mixed surfactants of partially-quaternized 2-vinylpyridine telomers (xRn-2VPQ, x is the total number of alkyl chains, n is the alkyl chain length) and monomeric alkyltrimethylammonium bromide (1RnQ) or gemini 1, 2-bis(alkyldimethylammonio)ethane dibromide (2RnenQ) were investigated at pH 2 by surface tension, foaming property, interfacial tension and emulsification power. The mixed critical micelle concentrations (cmcs) were intermediate between the pure component xRn-2VPQ and 1RnQ or 2RnenQ. xRn-2VPQ / 2RnenQ system was higher efficiencies in lowering the surface tension than xRn-2VPQ / 1RnQ. The surface tension was influenced by the alkyl chain length of binary surfactants and the mole fraction (α) of xRn-2VPQ. In particular, 2.0R10-2VPQ / 2R10enQ system with α = 0.50 showed the lowest surface tension. The mixtures of two cationic multialkylated surfactants improved the foaming properties as compared with the pure component cationic surfactants. The similar trends in the surface tension and the foaming properties were observed for the lowering abilities of the interfacial tension at the water / toluene interface and emulsion stabilities. © 2002, Japan Oil Chemists’ Society. All rights reserved., 2002, 51, 4, 221, 227, Scientific journal, 10.5650/jos.51.221
  • Refereed, Journal of Oleo Science, Preparation and Surface-Active Properties of N-Alkyl Maleamic Acid Telomer Type Surfactants Having Several Hydrocarbon Chains, Tomokazu Yoshimura; Yoshifumi Koide; Hideto Shosenji; Kunio Esumi, Telomerization of N-alkyl maleamic acid monomer (RnMaAm, n is the alkyl chain length n=6-14), which was synthesized by reaction of maleic anhydride with alkylamine, in the presence of alkanethiol as a chain transfer agent gave the telomers (xRnMaAm, x is total number of alkyl chains x=2.9-3.2) in 60-90 % yields. The surface-active properties such as surface tension, foaming property and emulsion stability were examined in water as well as in hard water containing 300 ppm of Ca2+. The critical micelle concentrations (cmcs) of 2.9-3.2RnMaAm telomers were 1/142-1/42 of those of RnMaAm monomers with the same alkyl chain length. The surface tensions of aqueous solutions of RnMaAm monomers and 2.9-3.2RnMaAm telomers were 30-35 and 24-32 mN m-1, respectively. The addition of Ca2+ to the aqueous solutions of 2.9-3.2RnMaAm lowered the cmc, while gave a low efficiency at reducing the surface tension. Of the telomers, 3.0R12MaAm gave the highest foaming ability and the highest foam stability in water. Shaking of the mixtures of organic solvent and the aqueous solutions of xRnMaAm telomers formed oil-in-water type emulsions. The emulsion stabilities were in the orders of toluene > n-octane > n-dodecane > n-hexadecane > kerosene as an oil phase. The highly emulsions for toluene or n-dodecane were formed by using 3.0R8MaAm and 3.0R10MaAm. The aqueous solutions of RnMaAm monomers and 2.9-3.2RnMaAm telomers gave interfacial tension of 8-10 and 4-6 mN m-1, respectively, for the interface with toluene. Thus, N-alkyl maleamic acid telomer type anionic surfactants having several alkyl chains showed greater surface activities than the corresponding monomeric monomers as well as the conventional surfactants. © 2002, Japan Oil Chemists’ Society. All rights reserved., 2002, 51, 4, 229, 236, Scientific journal, 10.5650/jos.51.229
  • Refereed, JOURNAL OF SURFACTANTS AND DETERGENTS, AMER OIL CHEMISTS SOC A O C S PRESS, Synthesis and properties of N-(alpha-carboxyalkyl)acrylamide telomer-type surfactants having multihydrocarbon chains, T Yoshimura; Y Kiridoshi; Y Koide; H Shosenji; K Esumi, N-(alpha-Carboxyalkyl)acrylamide telomer-type surfactants (xC(n-1)AmAc where n is alkyl chain length = 6, 8,10,12; and x is degree of polymerization = 3.3-13.1) were synthesized by the telomerization of monomer (Cn-1AmAc) in the presence of the corresponding alkanethiol as a chain transfer agent and then investigated for their surface-active properties. xC(n-1)AmAc telomers lowered the surface tension of aqueous solutions that were at pH 9-10. The critical micelle concentrations (CMC) of the telomers were lower than those of the monomers with the same alkyl chain length, and the CIVIC values shifted to lower concentrations with both increasing alkyl chain length and polymerization degree. xC(9)AmAc with x = 3.3-6.3 gave the highest efficiencies in lowering the surface tension. The cross-sectional molecular areas per molecule of xC(n-1)AmAc telomers were smaller than the values estimated on the assumption that they are assemblies of Cn-1AmAc monomer units. The foaming abilities and the foam stabilities were both in the orders of xC(7)AmAc > xC(9)AmAc > xC(5)AmAc > xC(11)AmAc. Mixtures of aqueous solutions of xC(n-x)AmAc telomers and toluene formed oil-in-water emulsions. The emulsion-stabilizing abilities were in the orders of xC(7)AmAc > xC(5)AmAc > xC(9)AmAc = xC(11)AmAc. The addition of Ca2+ to the mixed solutions of telomers and toluene resulted in formation of water-in-oil type emulsions. Thus, the surface-active properties of the telomers were influenced significantly by the alkyl chain length and the polymerization degree of the telomers. In addition, these properties could be correlated with the hydrophilic-lipophilic balance (HLB); the highest surface activities were observed by using xC(n-1)AmAc with HLB of 14-18., Apr. 2002, 5, 2, 159, 164, Scientific journal
  • Refereed, Colloids Surf., B, Effect of Dilution on Aqueous Dispersion of Drug Particles, YOSHIMURA Tomokazu; H.Terayama; K.Hirota; T.Yoshimura; K.Esumi, Feb. 2002, 27, 2-3, 177-180
  • Refereed, 色材協会誌, コンプレキサン系Trimeric型界面活性剤の合成と物性(総説), YOSHIMURA Tomokazu, Feb. 2002, 75, 2, 75-81
  • Refereed, 色材協会誌, テロマー系多鎖型界面活性剤の合成と物性(総説), YOSHIMURA Tomokazu, Nov. 2001, 74, 11, 563-568
  • Refereed, Journal of Oleo Science, Preparation and Surface Activities of Zwitterionic Surfactants Derived from Cotelomers of 4-Vinylpyridine and Methyl Acrylate, Tomokazu Yoshimura; Rinko Tokunaga; Hideto Shosenji; Kunio Esumi, Cotelomer type zwitterionic surfactants having multi-hexyl chains and multi-carboxylate and multi-pyridinium functions (R6S-zR6VPQ-wVP-yAA, w and y mean the number of 4-vinylpyridine and sodium acrylate, respectively z means number of hexyl chains by quaternization) were prepared by quaternization and hydrolyses of cotelomers, which were prepared by cotelomerization of 4-vinylpyridine and methyl acrylate in presence of hexanethiol, and examined for their surface activities. Critical micelle concentration (cmc) of zwitterionic cotelomers shifted to lower concentration with increasing number of hexyl chains. The cmcs of R6S-zR6VPQ-wVP-yAA with z of 2.1-3.8 were from one 110 th to one 4 th of those of the corresponding cationic cotelomers. Zwitterionic cotelomers gave surface tension of 40-44 mN m-1 at the cmc. The increase of number of hexyl chains in R6S-zR6VPQ-wVP-2.3AA series reduced the surface activities. Vigorous shaking of the mixtures of water and chloroform solution of zwitterionic cotelomers formed oil-in-water type emulsion. Highly stable emulsion was formed by using R6S-zR6VPQ-wVP-2.3AA with z of 1.4-2.1 and the degrees of emulsification were kept at the level of 60-70% after 360 min of standing. Zwitterionic cotelomers gave interfacial tension of 2-4 mN m-1 at the water-chloroform interfaces and oriented themselves easier than equimolar mixtures of cationic cotelomer and anionic cotelomer. © 2001, Japan Oil Chemists' Society. All rights reserved., 2001, 50, 6, 467, 473, Scientific journal, 10.5650/jos.50.467
  • Refereed, Journal of Oleo Science, Preparation and Surface-Active Properties of Complexanetype Trimeric Surfactants from Tris(2-aminoethyl)amine, Emika Onitsuka; Tomokazu Yoshimura; Yoshifumi Koide; Hideto Shosenji; Kunio Esumi, Complexane-type trimeric surfactants of tris(1-carboxyalkyl-2-aminoethyl)amine (3Rntata n means alkyl chain length, n = 6-14) having three alkyl chains and three hydrophilic groups were prepared by the reaction of tris(2-aminoethyl)amine and 2-bromoalkanoic acid and examined for surface activities such as surface tension, emulsification and interfacial tension. Critical micelle concentration (cmc) of 3Rntata shifted to lower concentration with increasing alkyl chain length. The cmcs of 3Rntata with n of 10-14 were lower by about 1-2 orders of magnitude than those of complexane-type monomeric surfactant of 2-aminoalkanoic acid (RnNAc) and dimeric surfactant of N, N″-bis(1-carboxyalkyl)diethylenetriamine (2Rndtda) with the same alkyl groups. In the case of R12, 3Rntata gave about twice cmc of trimeric surfactant of (N-1-carboxyalkyl-2-aminoethyl)alkyllamine (3Rndtda) having three alkyl chains and two hydrophilic groups. Surface tension at each cmcs of 3R10tata, 3R12tata and 3R14tata was 33.0, 26.9 and 29.6 mN m-1, respectively. 3R12tata and 3R14tata gave more efficient in lowering the surface tension than RnNAc and 2Rndtda. The values of cross-sectional molecular area (A) of 3Rntata with n of 10-14 were 42-75 Å2. They were extremely small in comparison with three times of A of RnNAc. The aqueous solutions of 3Rntata were emulsified by shaking with toluene. Highly stable oil-in-water type emulsion was formed by using 3Rntata with n of 10-14 and the degree of emulsification was kept 60% after 20 h. Interface between the aqueous solutions of 3R10tata, 3R12tata and 3R14tata and toluene gave the interfacial tension of 1, 1 and 6 mN m-1, respectively. © 2001, Japan Oil Chemists' Society. All rights reserved., 2001, 50, 3, 159, 164, Scientific journal, 10.5650/jos.50.159
  • Refereed, Journal of Oleo Science, Preparation and Surface Activities of Cotelomers of Acrylic Acid and n-Octyl, 2-Ethylhexyl or 2-Phenylethyl Acrylate, Tomokazu Yoshimura; Koichi Hontake; Hideto Shosenji; Kunio Esumi, Cotelomers of acryric acid and n-octyl acrylate, 2-ethylhexyl acrylate or 2-phenylethyl acrylate with same carbon numbers (abbreviation by 2.1NoA-1.2AA, 1.9EhA-2.9AA and 1.6PeA-3.0AA, respectively 2.1,1.9 and 1.6 mean number of hydrophobic functions, 1.2, 2.9 and 3.0 mean number of carboxylate functions) were prepared by the radical cotelomerization in presence of 2-aminoethanethiol hydrochloride and examined for surface activity. Critical micelle concentrations (cmcs) of 2.1NoA-1.2AA and 1.9EhA-2.9AA were 1/16 and 1/5 of that of conventional surfactant of sodium n-octanoate. Surface tensions of aqueous solutions of 2.1NoA-1.2AA, 1.9EhA-2.9AA and 1.6PeA-3.0AA were 32.3, 27.3 and 41.1 mN m-1 at each cmc, respectively. 2.1NoA-1.2AA having straight alkyl chains and 1.9EhA-2.9AA having branched alkyl chains gave high foaming abilities in water as well as in hard water. 2.1NoA-1.2AA had high foam stability, while 1.9EhA-2.9AA showed poor stability. The highly stable oil-in-water type emulsions, which were brought about by shaking toluene with aqueous solutions of cotelomers, were formed by using 1.6PeA-3.0AA having aromatic nucleus. Interfacial tensions between aqueous solutions of 2.1NoA-1.2AA, 1.9EhA-2.9AA and 1.6PeA-3.0AA and toluene were 4, 8 and 1 mN m-1, respectively. © 2001, Japan Oil Chemists' Society. All rights reserved., 2001, 50, 2, 103, 108, Scientific journal, 10.5650/jos.50.103
  • Refereed, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ELSEVIER SCIENCE BV, Preparation of gold nanoparticles using 2-vinylpyridine telomers possessing multi-hydrocarbon chains as stabilizer, K Esumi; A Kameo; A Suzuki; K Torigoe; T Yoshimura; Y Koide; H Shosenji, Gold nanoparticles have been prepared in water by reduction of HAuCl4 with NaBH4 in the presence of 2-vinylpyridine telomers. The telomers (nRm-2VPQ, n is the total number of chain; m is the main chain length) consist of multi-octyl side chains or multi-dodecyl side chains (2.1R(8)-2VPQ, 2.5R(12)-2VPQ, and 3.4R(12)-2VPQ). The particle size of gold decreases with increasing telomer concentration and stable gold nanoparticles are obtained above the critical micelle concentration of the telomer. The change in the particle size can be correlated with the structure of the telomer; when the alkyl chain length is longer and the total chain number is greater, the size becomes smaller. (C) 2001 Elsevier Science B.V. All rights reserved., Jan. 2001, 176, 2-3, 233, 237, Scientific journal
  • Refereed, J. Oleo Sci. (J. Jpn. Oil Chem. Soc.), Japan Oil Chemists' Society, Preparation and Surface Activity of Complexane-Type Surfactants Having Two and Three Alkyl Chains, YOSHIMURA Tomokazu; E.Onitsuka; J.Beppu; T.Yoshimura, Complexane-type surfactants possessing two and three alkyl chains (2Rnida, 2Rnedda, 2Rndtda and 3Rndtda; n means alkyl chain length) were prepared by the corresponding amine and the appropriate alkyl bromide and examined for surface activity. Critical micelle concentration (cmc) was found to shift to lower concentration with increase in alkyl chain length, number of alkyl chains and decrease in spacer length. Cmcs of 3R8dtda and 3R12dtda having three alkyl chains were 2-3 smaller than that of the corresponding surfactant having one alkyl chain. Surface tension of complexanes was significantly affected by alkyl chain and spacer length and the number of alkyl chains. Surface tension of 3R8dtda attained to 24.0mN m-1 at cmc. Cross-sectional molecular areas of 3Rndtda with n=6-12 were extremely small in comparison with three times of that of R12NAc and those of 2Rnida, 2Rnedda and 2Rndtda. Complexane solution was emulsified by shaking with toluene. 2R12ida showed a stable water-in-oil type emulsion and 2Rnedda and 2Rndtda with n=10-12 and 3R8dtda each showed a high oil-in-water type emulsion. Interfacial tension between toluene and complexane solution was 1-2mN m-1 for complexanes with n=12. Multi-alkylated complexanes with HLB of about 22 showed the greatest surface activity. 3R8dtda was a more efficient surfactant at air/water and toluene/water interfaces., Sep. 2000, 49, 9, 929-935, 935,973, 10.5650/jos1996.49.929
  • Refereed, J. Oleo Sci. (J. Jpn. Oil Chem. Soc.), Japan Oil Chemists' Society, Preparation of Cotelomers of Acrylic Acid and n-Hexyl, 2-Ethylhexyl or n-Dodecyl Acrylate and Their Properties as Multi-Alkylated Surfactants, YOSHIMURA Tomokazu; T.Yoshimura; Y.Koide; H.Shosenji; K.Esumi, Multi-alkylated surfactants of cotelomers of alkyl acrylate and acrylic acid (xRmA-yAA; x, y and m mean number of alkyl chains, number of hydrophilic functions and alkyl chain length, respectively) were prepared by cotelomerization of n-hexyl acrylate, 2-ethylhexyl acrylate or n-dodecyl acrylate and acrylic acid in the presence of 2-aminoethanethiol hydrochloride and examined for surface activity. Surface tension of aqueous solution of xR6A-yAA, xR8A-yAA and xR12A-yAA was 28-32, 27-30 and 38-45mN m-1, respectively. Critical micelle concentration (cmc) decreased with greater number of alkyl chains and alkyl chain length in xR6A-yAA, xR8A-yAA and xR12A-yAA. 2.9R6A-2.3AA, 2.8R8A-2.5AA and 2.7R12A-2.9AA in the presence of 300ppm of Ca2+ exhibited surface tension of 24, 28 and 33mN m-1, respectively. 2.9R6A-2.3AA, possessing shorter alkyl chains, had high foam stability, while 2.8R8A-2.5AA, having branched alkyl chains, showed poor stability. Interface between aqueous solution of xR6A-yAA, xR8A-yAA and xR12A-yAA and toluene indicated interfacial tension of 11-13, 8-12 and 10-15mN m-1, respectively. Cmcs of cotelomers at the interface were 1/3 to 1/4 that of sodium n-dodecanoate, a conventional surfactant. Emulsification of toluene was brought about by shaking with aqueous solution of cotelomers. A highly stable oil-in-water type emulsion was formed on using cotelomers having 2 to 3 alkyl chains., Aug. 2000, 49, 8, 801-808, 808,841, 10.5650/jos1996.49.801
  • Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC, Physicochemical properties of 2-vinylpyridine telomers possessing multihydrocarbon chains in aqueous solution and at the silica/aqueous solution interface, K Esumi; H Mizutani; K Shoji; M Miyazaki; K Torigoe; T Yoshimura; Y Koide; H Shosenji, Physicochemical properties of multialkylated surfactants of partially quaternized 2-vinylpyridine telomers having multihydro-carbon side chains (nRm-2VPQ: n, number of chains; m, alkyl chain length) in aqueous solutions were investigated. The critical micelle concentration (cmc) and surface tension at the cmc were 13 mu mol dm(-3) and 52 mNm(-1) for 2.1R(8)-2VPQ, 7.1 mu mol dm(-3) and 37 mNm(-1) for 2.5R(12)-2VPQ, and 4.7 mu mol dm(-3) and 40.0 mNm(-1) for 3.4R(12)-2VPQ, respectively. The aggregation numbers at the cmc determined by the light scattering method were 4 +/- 1 for 2.1R(8)-2VPQ, 45 +/- 10 for 2.5R(12)-2VPQ, and 11 +/- 1 for 3.4R(12)-2VPQ, Thus, the number of chains and the alkyl chain length of the telomers affected the micellar properties in aqueous solutions. At the interface of the silica/aqueous solution, the adsorbed amounts of the telomers increased sharply at their low concentrations and reached a plateau by forming a monolayer and a subsequent bilayer, Silica suspensions also showed a dispersion-flocculation-redispersion sequence with the telomer concentration, where the maximum sedimentation rate was influenced by the number of chains and the alkyl chain length of the telomers, (C) 1999 Academic Press., Dec. 1999, 220, 1, 170, 173, Scientific journal
  • Refereed, J. Oleo Sci. (J. Jpn. Oil Chem. Soc.), Japan Oil Chemists' Society, Surface Activities of Multi-Alkylated Surfactants of 2-Vinylpyridine Telomer with Polymerization Degree 4-6, YOSHIMURA Tomokazu; T.Yoshimura; Y.Koide; H.Shosenji; K.Esumi, Multi-alkylated surfactants of partially-quaternized 2-vinylpyridine telomers having 2-4 alkyl chains (xRn-2VPQ; x and Rn mean the number of lipophilic alkyl chains and alkyl chain length, respectively) were derived from telomers with polymerization degree (Pn) ca. 5 obtained as salts of hydrochloric acid. Surface activitiy was voted to be highly affected by alkyl chain length and number of chains. Surface tension of 3.9R8-2VP+Q and 3.4R12-2VP+Q with Pn ca. 5 solutions (pH 2) was 28-29mN m-1 at critical micellar concentration. Surface activity was affected by Pn of telomers and xRn-2VP+Q having 3-4 octyl or dodecyl chains with Pn ca. 5 showed greater surface activity than xR12-2VP+Q having 3-6 dodecyl chains with Pn 10-20., Nov. 1999, 48, 11, 1297-1302, 1302,1323, 10.5650/jos1996.48.1297
  • Refereed, Journal of Oleo Science, Japan Oil Chemists' Society, 2-ビニルピリジン系テロマーを基本骨格とする3?6本ドデシル側鎖型界面活性剤の合成と界面化学的特性, YOSHIMURA Tomokazu, Multi-alkylated surfactants of partially-quaternized 2- or 4-vinylpyridine telomers having multi-dodecyl side chains (nL-2VPQ and nL-4VPQ; n, number of chains) were derived from telomers with polymerization degree (Pn) 5-20, prepared by the polymerization of 2- or 4-vinylpyridine in dodecanethiol as solvent, and examined for surface activity. Surface tension of the aqueous solution (pH 2) was 32-33mNm-1 for 3.2-9.5L-2VP+Q with Pn 11 and 37mNm-1 for 3.2L-4VP+Q with Pn 10. This parameter varied with the number of dodecyl chains and critical micellar concentration (cmc) decreased with increase in this number. Suface tension and cmc were determined in part by the particular positions of chains on the pyridine ring and polymerization degree. nL-2VP+Q with Pn 11 was more efficient in reduceng surface tension and depressing cmc than nL-4VP+Q and nL-2VP+Q with Pn 20. Toluene was emulsified by shaking with nL-2VP+Q or nL-4VP+Q solution. Dodecyl chain number affected the extent by emulsification and nL-2VP+Q with Pn 11 emulsified more than nL-2VP+Q with Pn 20 or nL-4VP+Q. Surface activity was greatest when using 3.2-6.2L-2VP+Q with Pn 11., Feb. 1999, 48, 2, 123-130, 130, 10.5650/jos1996.48.123
  • Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier BV, Surface adsorption and bulk properties of polyoxyethylene–polyoxypropylene random copolymer-type double-chained surfactants in quaternary-ammonium-salt-type amphiphilic gemini ionic liquids, Risa Kawai; Maiko Niki; Shiho Yada; Tomokazu Yoshimura, Feb. 2023, 658, 130644, 130644, Scientific journal, 10.1016/j.colsurfa.2022.130644
  • Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier BV, Linear- and star-type quaternary ammonium salt-based trimeric surfactants: Effect of structure on adsorption and aggregation properties, Tsukasa Morita; Shiho Yada; Tomokazu Yoshimura, Jan. 2023, 656, 130364, 130364, Scientific journal, 10.1016/j.colsurfa.2022.130364
  • Chemistry – A European Journal, Wiley, Cover Feature: Fine Tunable, Redox Active Octapalladium Chains Supported by Linear Tetraphosphines, Leading to Dynamically 1D Self‐Assembled Coordination Polymers (Chem. Eur. J. 47/2021), Tomoaki Tanase; Kanako Nakamae; Haruka Miyano; Yasuyuki Ura; Yasutaka Kitagawa; Shiho Yada; Tomokazu Yoshimura; Takayuki Nakajima, 19 Aug. 2021, 27, 47, 12010, 12010, Scientific journal, 10.1002/chem.202102416
  • Heterocycles, Large-scale synthesis of thio-glucose-conjugated chlorin E6 for photodynamic therapy, Akihiro Nomoto; Hiroaki Yamaguchi; Masato Masuda; Keisuke Hyakumura; Shintaro Kodama; Tomohiro Osaki; Yoshiharu Okamoto; Mamoru Tanaka; Hiromi Kataoka; Atsushi Narumi; Tomokazu Yoshimura; Shigenobu Yano; Akiya Ogawa, Chlorin e6 is a heterocycle exhibiting spectral absorption in the 600-700 nm wavelength range used for photodynamic therapy (PDT). Herein, a sugar-conjugated chlorin e6 derivative was synthesized on a large scale. An alkyl spacer was fabricated by controlling the alkoxylation conditions between the thio-sugar and chlorin e6 and thio-glucose-conjugated chlorin e6 was successfully synthesized., 2021, 103, 2, Scientific journal, 10.3987/COM-20-S(K)73
  • Quantum Beam Science, MDPI AG, Microscopic Depictions of Vanishing Shampoo Foam Examined by Time-of-Flight Small-Angle Neutron Scattering, Satoshi Koizumi; Yohei Noda; Takumi Inada; Tomoki Maeda; Shiho Yada; Tomokazu Yoshimura; Hiroshi Shimosegawa; Hiroya Fujita; Munehiro Yamada; Yukako Matsue, A novel surfactant of N–dodecanoyl–N–(2-hydroxyethyl)–β–alanine (coded as C12–EtOH–βAla) was synthesized by modifying the methyl group of N–dodecanoyl–N–methyl–β–alanine (coded as C12–Me–βAla). Amino-acid-type surfactants (C12–EtOH–βAla and C12–Me–βAla) are more healthy and environmentally friendly compared to sodium dodecyl sulfate (SDS). To investigate the microstructures of these new surfactants, we employed a method of time-of-flight small-angle neutron scattering (TOF SANS) at a pulsed neutron source, Tokai Japan (J–PARC). The advances in TOF SANS enable simultaneous multiscale observations without changing the detector positions, which is usually necessary for SANS at the reactor or small-angle X-ray scattering. We performed in situ and real-time observations of microstructures of collapsing shampoo foam covering over a wide range of length scales from 100 to 0.1 nm. After starting an air pump, we obtained time-resolved SANS from smaller wave number, small-angle scattering attributed to (1) a single bimolecular layer with a disk shape, (2) micelles in a bimolecular layer, and (3) incoherent scattering due to the hydrogen atoms of surfactants. The micelle in the foam film was the same size as the micelle found in the solution before foaming. The film thickness (~27 nm) was stable for a long time (<3600 s), and we simultaneously found a Newton black film of 6 nm thickness at a long time limit (~1000 s). The incoherent scattering obtained with different contrasts using protonated and deuterated water was crucial to determining the water content in the foam film, which was about 10~5 wt%., 29 Jan. 2023, 7, 1, 4, 4, Scientific journal, 10.3390/qubs7010004
  • Refereed, Acc. Mater;Surf. Res, Risa Kawai, Shiho Yada, Tomokazu Yoshimura, 河合里紗; 矢田詩歩; 吉村倫一, Aug. 2022, 7, 3, 92, 102, Scientific journal
  • Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier BV, Adsorption dynamics of quaternary-ammonium-salt–based gemini and trimeric surfactants with different spacer structures at air/water interface, Tsukasa Morita; Shiho Yada; Tomokazu Yoshimura, May 2023, 671, 131589, 131589, Scientific journal, 10.1016/j.colsurfa.2023.131589
  • Physical Chemistry Chemical Physics, Royal Society of Chemistry (RSC), Catalytic activity of gold nanoparticles protected by quaternary ammonium salt-based gemini surfactants with different spacer structures, Tsukasa Morita; Shiho Yada; Tomokazu Yoshimura, The structure and catalytic activities of gold nanoparticles were affected by the spacer structure., 2023, 25, 24, 16288, 16293, Scientific journal, 10.1039/d3cp01116j
  • Journal of Oleo Science, Japan Oil Chemists' Society, Micelle Formation of Dodecanoic Acid with Alkali Metal Counterions, Keisuke Matsuoka; Aiko Sato; Yukino Ogawa; Kana Okazaki; Shiho Yada; Tomokazu Yoshimura, 2023, 72, 9, 831, 837, Scientific journal, 10.5650/jos.ess23086
  • Refereed, Langmuir, Stability and Structural Analysis using Small-Angle Neutron Scattering for Foam of Homogeneous Polyoxyethylene type Nonionic Surfactant with Multi–Branched chains, Shiho Yada; Mizuho Kuroda; Masashi Ohno; Toshinari Koda; Tomokazu Yoshimura, 31 Oct. 2023, 39, 43, 15355, 15361, Scientific journal, 10.1021/acs.langmuir.3c02424

MISC

  • Proceedings of the 3rd J-PARC Symposium (J-PARC2019), Journal of the Physical Society of Japan, Rheo-SANS Study on Shear Thinning Behavior of Cationic Gemini Surfactant (12–2–12) in Salt-free Solution, Hiroki Iwase; Risa Kawai; Tomokazu Yoshimura; Shin-ichi Takata, 26 Mar. 2021, 10.7566/jpscp.33.011078
  • Refereed, JPS Conf. Proc., Structural Study of a Gold Nanoparticle/Sugar-type Surfactant Complex by SANS, SAXS, TEM, and EXAFS Techniques, K. Akutsu; H. Iwase; Y. Nakatani; T. Yoshimura, 2015, 8, 033011, 10.7566/JPSCP.8.033011
  • Refereed, JPS Conf. Proc., SANS and SAXS studies on the aggregates properties of a gemini-type amphiphilic dendrimer in solution, H. Iwase; N. K. Kawano; K. Akutsu; T. Yoshimura, 2015, 8, 033012
  • Not Refereed, コンバーテック, 次世代クローズド水系洗浄システム, YOSHIMURA Tomokazu, Jul. 2014, 42, 7, 109-111
  • Not Refereed, コンバーテック, 次世代洗浄システムによるデバイス製造工程のパラダイムシフト, YOSHIMURA Tomokazu, May 2014, 42, 5, 71-73
  • Not Refereed, Oleoscience, Japan Oil Chemists' Society, 特異な構造を有する新規界面活性剤の合成と物性に関する研究(総説), YOSHIMURA Tomokazu, Surface active materials including surfactant are the substances that exert a variety of functions at the interface, and so the relationship between their chemical structures and performance is very important in practical as well as academic. In this article, to control the orientation of the Rf groups on the surface with close packing, the author raised a novel concept of introduction of fluoroalkyl groups (Rf) as both (i) semifluoroalkyl (semi-Rf) and (ii) multi-chain structure, and also outlined his research results on the development of Rf end-capped oligomeric interface materials, surface modifying polymer having double semi-Rf groups into the side chains, and semi-Rf based Gemini surfactants. Furthermore, as the environment friendly surfactants, the development of corynomycolic acid and Gemini surfactants are described as well as the effects of stereochemistry in the succinic Gemini and tartaric Gemini on their functional properties., Dec. 2013, 13, 12, 587-597, 585, 10.5650/oleoscience.13.573
  • Not Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Aggregation properties of supralong-chain surfactants with double or triple quaternary ammonium head groups, Keisuke Matsuoka; Nagisa Chiba; Tomokazu Yoshimura, Double or triple quaternary ammonium head groups were designed to improve the solubility of supralong alkyl chain surfactants. In the surfactant head group, quaternary ammonium groups are connected by an ethylene spacer. Micellar shapes of divalent surfactants [CH2n+1N+(CH3)(2)-(CH2)(2)-N(CH3)(3) 2Br(-): C-n-2Am (n = 18, 20, and 22)] and trivalent surfactants [CnH2n+1N+(CH3)(2)-(CH2)(2)-N+(CH3)(2)-(CH2)(2)-N+(CH3)(3) 3Br(-): C-n-3Am (n = 18, 20, and 22)] were studied in aqueous solutions by means of dynamic light scattering (DLS) and transmission electron microscopy (TEM). Changes in the surfactant concentration have a small influence on the apparent hydrodynamic radii (r(h)) of the molecular aggregates in both surfactant series. Average values of r(h) of aggregates are 60-90 nm for C-n-2Am (n= 18, 20, and 22) and 2-40 nm for C-n-3Am (n = 18, 20, and 22). TEM micrographs showed that aggregates of C-n-2Am (n = 18, 20, and 22) typically formed rod-like micelles. In contrast, trivalent surfactants of C-n-3Am (n = 18, 20, and 22) formed spherical (C-18-3Am) or ellipsoidal micelles (C-20-3Am and C-22-3Am). Moreover, the degree of micellar counterion binding for these surfactants was determined by using a bromide ion-selective electrode, which indicated relatively high values (0.8-0.9) for C-n-2Am (n = 18, 20, and 22) and more common values (0.5-0.8) for C-n-3Am (n = 18, 20, and 22). The size of the aggregates is closely related to the degree of counterion binding. (C) 2012 Elsevier Inc. All rights reserved., Aug. 2012, 379, 1, 72, 77, 10.1016/j.jcis.2012.04.043
  • Not Refereed, 光散乱ジャーナル LSアドバンス, ジェミニ型界面活性剤の水溶液中でのミセル構造, YOSHIMURA Tomokazu, Nov. 2011, 10, 2-8
  • Not Refereed, オレオサイエンス, フッ素系ジェミニ型界面活性剤(総説), YOSHIMURA Tomokazu, Sep. 2011, 11, 9, 319-326
  • Not Refereed, Fragrance journal, フレグランスジャーナル社, 環境に適した新規糖型界面活性剤の開発(特集), YOSHIMURA Tomokazu, Aug. 2009, 37, 8, 26-32, 32
  • Not Refereed, 日本化学会コロイドおよび界面化学部会ニュースレター, 特異な構造を有する次世代界面活性剤の分子設計(Interface), YOSHIMURA Tomokazu, Mar. 2008, 33, 1, 7-12
  • Not Refereed, Colloids Surf., A, Synthesis and Surface-Active Properties of Sulfobetaine-Type Zwitterionic Gemini Surfactants, YOSHIMURA Tomokazu; T.Yoshimura; T.Ichinokawa; M.Kaji; K.Esumi, Feb. 2006, 273, 208-212
  • Not Refereed, JOURNAL OF COLLOID AND INTERFACE SCIENCE, ACADEMIC PRESS INC ELSEVIER SCIENCE, Voltammetric study of sodium hypochlorite using dendrimer-stabilized gold nanoparticles, T Endo; T Yoshimura; K Esumi, Electrochemical activity of dendrimer-stabilized gold nanoparticles on a glassy carbon electrode (GCE) was studied by means of cyclic voltammetry of sodium hypochlorite. Dendrimer-stabilized gold nanoparticles were deposited onto a glassy carbon surface by electrophoresis and the deposition was observed by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Both anodic and cathodic peak currents were found to increase after the deposition of dendrimer-stabilized gold nanoparticles. In the case of dendrimers deposited onto the GCE surface, the magnitude of the current was smaller than for dendrimer-stabilized-gold-nanoparticle-modified GCE. This indicates the enhancement in the rate of electrolysis due to gold nanoparticles. (C) 2003 Elsevier Inc. All rights reserved., Jan. 2004, 269, 2, 364, 369, 10.1016/S0021-9797(03)00674-X
  • Not Refereed, Studies in Surface Science and Catalysis, Preparation and Surface-Active Properties of Cotelomer Type Surfactants of Alkyl Acrylate and Acrylic Acid, YOSHIMURA Tomokazu; T.Yoshimura; Y.Koide; H.Shosenji; K.Esumi, 2001, 132, 145-148

Books etc

  • 化学便覧 基礎編 改訂6版, 丸善, 16.4.2「ミセル」担当, Jan. 2021
  • 界面活性剤の選び方、使い方 事例集(第2章第3節「ユニークな構造のポリオキシエチレン系非イオン界面活性剤の開発」担当(矢田詩歩,吉村倫一)), 技術情報協会, YOSHIMURA Tomokazu, 分担, Apr. 2019, pp.**-**, Not Refereed
  • ─化粧品開発のための最新の美容皮膚科学理論と具現化するための最新の処方技術─ 最新・化粧品開発のための美容理論、処方/製剤、機能評価の実際(第32章「ジェミニ型界面活性剤の創製~アミノ酸・糖・ポリオキシエチレンを用いて」担当(矢田詩歩,吉村倫一)), 技術教育出版, YOSHIMURA Tomokazu, 分担, Jul. 2018, pp.322-333, Not Refereed
  • 泡の生成メカニズムと応用展開, シーエムシー出版, YOSHIMURA Tomokazu, 分担, Apr. 2017, pp.101-110, Not Refereed
  • 界面活性剤の最新研究・素材開発と活用技術, シーエムシー出版, YOSHIMURA Tomokazu, 分担, Aug. 2016, pp.53-64, Not Refereed
  • エマルションの特性評価と新製品開発、品質管理への活用-吸着挙動の解析、界面張力の測定、構造の解析、安定性の評価-(第2章4節「界面活性剤の性能評価法」担当), 技術情報協会, YOSHIMURA Tomokazu, 分担, Oct. 2014, pp.53-60, Not Refereed
  • 油脂・脂質・界面活性剤データブック, 丸善, YOSHIMURA Tomokazu, 分担, Dec. 2012, Not Refereed
  • 改訂第2版 界面と界面活性剤-基礎から応用まで-(第3章7節「ポリマー界面活性剤」担当), 日本油化学会, YOSHIMURA Tomokazu, 分担, Mar. 2009, pp.83-88, Not Refereed
  • 油化学辞典 脂質・界面活性剤 第二版, 丸善, YOSHIMURA Tomokazu, 分担, May 2006, Not Refereed
  • 界面と界面活性剤-基礎から応用まで-(第2章7節「ポリマー界面活性剤」担当), 日本油化学会, YOSHIMURA Tomokazu, 分担, Apr. 2005, pp.75-79, Not Refereed
  • 油化学辞典 脂質・界面活性剤, 丸善, YOSHIMURA Tomokazu, 分担, Mar. 2004, Not Refereed
  • Structure-Performance Relationships in Surfactants 2nd ed (Chap.9"Surface-Active Properties of Telomer-Type Surfactants Having Several Hydrocarbon Chains"担当), Marcel Dekker, YOSHIMURA Tomokazu; K.Esumi; 名執筆者, 分担, 2003, pp.399-432, Not Refereed
  • NMRによる有機材料分析とその試料前処理、データ解釈, 技術情報協会, 第5章3節「NMR法による界面活性剤の分析」担当, Sep. 2021
  • エマルションの安定化のための新しい調製技術と評価, 技術情報協会, 技術情報協会, 第2章3節「界面吸着とミセル形成」, Oct. 2022, 714p, 9784861049002
  • 洗浄の事典, 朝倉書店, 大矢, 勝; 天田, 徹; 荒牧, 賢治; 北村, 裕夫; 蓼沼, 裕彦; 中村, 一穂; 松宮, 正彦; 山田, 勲, 3-11「2鎖型・ジェミニ型・トリメリック型」, Oct. 2022, xiv, 535, 9p, 図版 [4] p, 9784254252736
  • 泡の生成・消泡の基礎と産業利用, シーエムシー出版, 吉村 倫一, 第1章「泡の構造と性質」; 第2章「泡に必要な界面活性剤の基礎」; 第4章「起泡力と泡沫安定性に及ぼす因子」; 第5章-2「ヒドロキシ基含有アミノ酸系界面活性剤」, Sep. 2022, v, 300p, 9784781316772

Presentations

  • Public discourse
  • 長濱佑美; 羽田容介; 澤木茂豊; 矢田詩歩; 吉村倫一, 日本化学会第103春季年会(千葉(野田)・東京理科大学野田キャンパス), 中性子小角散乱を用いたアミノ酸-糖ハイブリッド界面活性剤がつくる泡沫の構造解析, 24 Mar. 2023, 25 Mar. 2023, 25 Mar. 2023
  • 桐山晴名; 佐々木勝行; 遠藤亮; 渡邉有咲; 矢田詩歩; 吉村倫一, 日本化学会第103春季年会(千葉(野田)・東京理科大学野田キャンパス), ホスホリルコリン基を有する新規界面活性剤の界面化学的性質, 22 Mar. 2023, 25 Mar. 2023, 25 Mar. 2023
  • 矢幡洵成; 河合里紗; 兼松秀行; 矢田詩歩; 吉村倫一, 日本化学会第103春季年会(千葉(野田)・東京理科大学野田キャンパス), 対イオンにアミノ酸を有するジェミニ型カチオン界面活性剤の表面吸着と抗菌性 矢幡洵成*,河合里紗*,兼松秀行*,矢田詩歩,吉村倫一, 22 Mar. 2023, 25 Mar. 2023, 25 Mar. 2023
  • 荷見遥; 大野正司; 好田年成; 矢田詩歩; 吉村倫一, 日本化学会第103春季年会(千葉(野田)・東京理科大学野田キャンパス), 多分岐鎖を有するポリオキシエチレンリン酸エステル塩型アニオン界面活性剤の水溶液物性, 24 Mar. 2023, 22 Mar. 2023, 25 Mar. 2023
  • 河合里紗; 矢幡洵成; 矢田詩歩; 吉村倫一, 日本化学会第103春季年会(千葉(野田)・東京理科大学野田キャンパス), 対イオンにアミノ酸を有する四級アンモニウム塩系ジェミニ型界面活性剤の水溶液物性, 24 Mar. 2023, 22 Mar. 2023, 25 Mar. 2023
  • 矢田詩歩; 下村澄愛; 沼崎英一; 平田直之; 加藤暢浩; 川口春馬; 吉村倫一, 日本化学会第103春季年会(千葉(野田)・東京理科大学野田キャンパス), ジェミニ型界面活性剤を用いたカチオン化ベシクルの構造と性能, 22 Mar. 2023, 22 Mar. 2023, 25 Mar. 2023
  • 長濱佑美; 小林礼実; 岩瀬裕希; 羽田容介; 澤木茂豊; 矢田詩歩; 吉村倫一, 日本化学会第103春季年会(千葉(野田)・東京理科大学野田キャンパス), X線・中性子小角散乱とレオロジーを用いたアミノ酸−糖ハイブリッド界面活性剤の会合体の構造解析, 22 Mar. 2023, 22 Mar. 2023, 25 Mar. 2023
  • 須崎圭祐; 中村湧大; 河合里紗; 兼松秀行; 守田つかさ; 矢田詩歩; 吉村倫一, 日本化学会第103春季年会(千葉(野田)・東京理科大学野田キャンパス), 四級アンモニウム塩系ジェミニ型およびトリメリック型界面活性剤の接触角と抗菌性, 22 Mar. 2023, 22 Mar. 2023, 25 Mar. 2023
  • 王珊; 岩瀬裕希; 高田慎一; 矢田詩歩; 吉村倫一, 2022年度量子ビームサイエンスフェスタ(つくば・つくば国際会議場(エポカルつくば)), 小角散乱を用いたグリシンを対イオンに有するジェミニ型カチオン界面活性剤の会合体の構造解析, 15 Mar. 2023, 13 Mar. 2023, 15 Mar. 2023
  • 渡邊萌; 岩瀬裕希; 矢田詩歩; 吉村倫一, 2022年度量子ビームサイエンスフェスタ(つくば・つくば国際会議場(エポカルつくば)), ベンザルコニウム系ジェミニ型カチオン界面活性剤とアニオン界面活性剤混合系の会合体および泡沫特性, 15 Mar. 2023, 13 Mar. 2023, 15 Mar. 2023
  • 長濱佑美; 岩瀬裕希; 矢田詩歩; 吉村倫一, 2022年度量子ビームサイエンスフェスタ(つくば・つくば国際会議場(エポカルつくば)), SAXSおよびSANSによるアミノ酸-糖ハイブリッド界面活性剤の会合体の構造解析, 15 Mar. 2023, 13 Mar. 2023, 15 Mar. 2023
  • 安部美季; 大畑哲也; 山田武; 矢田詩歩; 吉村倫一; 山田悟史, 2022年度量子ビームサイエンスフェスタ(つくば・つくば国際会議場(エポカルつくば)), NRとSANSによるドデカン酸カリウムとジグリセリン誘導体混合系の気/液界面における吸着特性と会合体特性, 15 Mar. 2023, 13 Mar. 2023, 15 Mar. 2023
  • 守田つかさ; 矢田詩歩; 吉村倫一, 2022年度量子ビームサイエンスフェスタ(つくば・つくば国際会議場(エポカルつくば)), SANSを用いた直鎖状および星状四級アンモニウム塩系トリメリック型界面活性剤が形成する会合体の構造解析, 15 Mar. 2023, 13 Mar. 2023, 15 Mar. 2023
  • 吉村倫一, 情報機構セミナー(Zoomを使用したオンラインセミナー), <泡の構造・性質・界面活性剤の基礎知識から押さえる>泡の生成・崩壊メカニズムと安定性・物性評価方法及び消泡剤選定など産業利用に向けた泡コントロール技術, 22 Feb. 2023, 22 Feb. 2023
  • 吉村倫一, 第40回コロイド・界面技術シンポジウム「コロイド界面化学が叶える、持続可能な社会~ミクロな一歩でマクロに貢献~」(オンライン(Zoom)), 次世代界面活性剤の開発, 26 Jan. 2023, 26 Jan. 2023
  • 吉村倫一, R&D支援センターセミナー(Zoomを使ったWEB配信セミナー), 乳化・可溶化の基礎知識と最新のエマルションの設計技術, 20 Jan. 2023, 20 Jan. 2023
  • 吉村倫一, 技術教育出版セミナー「界面活性剤の機能創製・素材開発・応用技術-基礎・技術/商品トレンド・最新技術」(ZOOMによるオンラインセミナー), 界面活性剤の新規創製と物性・機能評価, 18 Jan. 2023, 18 Jan. 2023
  • 河合里紗; 矢田 詩歩; 吉村 倫一, 第12回イオン液体討論会, Surface Adsorption and Bulk Behavior of Polyoxyethylene-Polyoxypropylene Random Copolymer-Type Double-Chained Surfactants in Quaternary-Ammonium-Salt-Type Amphiphilic Gemini Ionic Liquid, 24 Nov. 2022, 24 Nov. 2022, 25 Nov. 2022
  • 吉村倫一, 回コロイド・界面技術者フォーラムーコロイド領域の洗浄技術;オンライン開催, 界面活性剤の泡沫の安定性と構造の評価, 18 Nov. 2022, 18 Nov. 2022
  • 吉村倫一, 情報機構セミナー(Zoomによるオンラインセミナー), 可溶化・乳化の基礎知識から押さえるエマルション生成・調製・評価方法と安定化技術-コロイド・界面化学の基礎/相図の見方と解釈/マイクロエマルション/さまざまな設計技術-, 10 Jun. 2022, 10 Oct. 2022
  • 吉村倫一, シーエムシー出版セミナー(ライブ配信セミナー), 泡の生成・崩壊メカニズムと安定化技術, 30 Sep. 2022, 30 Sep. 2022
  • 長濱佑美; 羽田容介; 澤木茂豊; 矢田詩歩; 吉村倫一, 第73回コロイドおよび界面化学討論会(広島・広島大学東広島キャンパス(ハイブリッド形式)), 中性子小角散乱を用いたアミノ酸-糖ハイブリッド界面活性剤がつくる泡沫の構造と安定性の評価, 22 Sep. 2022, 20 Sep. 2022, 22 Sep. 2022
  • 守田つかさ; 矢田詩歩; 吉村倫一, 第73回コロイドおよび界面化学討論会(広島・広島大学東広島キャンパス(ハイブリッド形式)), 直鎖状および星状四級アンモニウム塩系トリメリック型界面活性剤の会合挙動に及ぼす分子構造の影響, 22 Sep. 2022, 20 Sep. 2022, 22 Sep. 2022
  • 王珊; 岩瀬裕希; 高田慎一; 河合里紗; 矢田詩歩; 吉村倫一, 第73回コロイドおよび界面化学討論会(広島・広島大学東広島キャンパス(ハイブリッド形式)), アミノ酸を対イオンに有するジェミニ型カチオン両親媒性化合物の会合体特性, 22 Sep. 2022, 20 Sep. 2022, 22 Sep. 2022
  • 河合里紗; 王珊; 矢田詩歩; 吉村倫一, 第73回コロイドおよび界面化学討論会(広島・広島大学東広島キャンパス(ハイブリッド形式)), グリシンを対イオンとする四級アンモニウム塩系ジェミニ型界面活性剤の合成と水溶液物性, 22 Sep. 2022, 20 Sep. 2022, 22 Sep. 2022
  • 渡邊萌; 河合里紗; 矢田詩歩; 吉村倫一, 第73回コロイドおよび界面化学討論会(広島・広島大学東広島キャンパス(ハイブリッド形式)), ベンザルコニウム系新規ジェミニ型界面活性剤の合成と水溶液物性, 22 Sep. 2022, 20 Sep. 2022, 22 Sep. 2022
  • 安部美季; 大畑哲也; 山田武; 矢田詩歩; 吉村倫一, 第73回コロイドおよび界面化学討論会(広島・広島大学東広島キャンパス(ハイブリッド形式)), ドデカン酸カリウムとジグリセリン誘導体混合系の気/液界面における吸着特性, 21 Sep. 2022, 20 Sep. 2022, 22 Sep. 2022
  • 矢田詩歩; 永田夕佳; 吉村倫一, 第73回コロイドおよび界面化学討論会(広島・広島大学東広島キャンパス(ハイブリッド形式)), 中性子小角散乱を用いた単一鎖長ポリオキシエチレンアルキルエーテル硫酸エステルナトリウムによって安定化された泡沫のミクロ構造評価, 21 Sep. 2022, 20 Sep. 2022, 22 Sep. 2022
  • 長濱佑美; 小林礼実; 岩瀬裕希; 羽田容介; 澤木茂豊; 矢田詩歩; 吉村倫一, 第73回コロイドおよび界面化学討論会(広島・広島大学東広島キャンパス(ハイブリッド形式)), X線小角散乱とレオロジーを用いたアミノ酸-糖ハイブリッド界面活性剤会合体の構造解析:糖の構造の影響, 20 Sep. 2022, 20 Sep. 2022, 22 Sep. 2022
  • 吉村倫一, 界面コロイドラーニング-第38回現代コロイド・界面化学基礎講座-(オンライン開催), 基礎からの界面活性剤, 02 Jun. 2022, 02 Jun. 2022
  • 吉村倫一, 技術情報協会セミナー(Zoomを使ったLIVE配信セミナー), 泡の生成・崩壊メカニズムと消泡剤の選び方、使い方, 30 Mar. 2022, 30 Mar. 2022
  • 天野沙耶; 岩瀬裕希; 川上隼人; 矢田詩歩; 吉村倫一, 日本化学会第102春季年会(オンライン開催), リン酸エステル塩型アニオン界面活性剤/四級アンモニウム塩系カチオン界面活性剤混合系のX線小角散乱とレオロジーによる会合挙動, 25 Mar. 2022, 23 Mar. 2022, 26 Mar. 2022
  • 小林礼実; 長濱佑美; 岩瀬裕希; 羽田容介; 澤木茂豊; 矢田詩歩; 吉村倫一, 日本化学会第102春季年会(オンライン開催), バリンを用いたアミノ酸-糖ハイブリッド界面活性剤が形成する会合体のX線小角散乱とレオロジーによる構造解析, 25 Mar. 2022, 23 Mar. 2022, 26 Mar. 2022
  • 中川真緒; 岡田篤; 片岡裕貴; 稲岡享; 矢田詩歩; 吉村倫一, 日本化学会第102春季年会(オンライン開催), ポリオキシエチレン系セカンダリー非イオン界面活性剤の水溶液中における相挙動, 25 Mar. 2022, 23 Mar. 2022, 26 Mar. 2022
  • 長濱佑美; 小林礼実; 羽田容介; 澤木茂豊; 矢田詩歩; 吉村倫一, 日本化学会第102春季年会(オンライン開催), グリシンとマルトースを用いたアミノ酸-糖ハイブリッド界面活性剤の合成と水溶液物性, 25 Mar. 2022, 23 Mar. 2022, 26 Mar. 2022
  • 大門あい; 河合里紗; 矢田詩歩; 吉村倫一, 日本化学会第102春季年会(オンライン開催), アミノ酸を対イオンとする四級アンモニウム塩系ジェミニ型界面活性剤の水溶液物性, 25 Mar. 2022, 23 Mar. 2022, 26 Mar. 2022
  • 河合里紗; 古市彩; 兼松秀行; 守田つかさ; 矢田詩歩; 吉村倫一, 日本化学会第102春季年会(オンライン開催), 四級アンモニウム塩系ジェミニ型およびトリメリック型界面活性剤の表面吸着挙動と抗菌性, 24 Mar. 2022, 23 Mar. 2022, 26 Mar. 2022
  • 天野沙耶; 川上隼人; 矢田詩歩; 吉村 倫一, 日本化学会第102春季年会(オンライン開催), リン酸エステル塩型アニオン界面活性剤の泡沫特性に及ぼすアミド結合の影響, 23 Mar. 2022, 23 Mar. 2022, 26 Mar. 2022
  • 吉村倫一, 技術情報協会セミナー(Zoomを使ったLIVE配信セミナー), アレニウス式、アイリング式の両方が学べる反応速度論 基礎講座, 16 Mar. 2022, 16 Mar. 2022
  • 長濱佑美; 岩瀬裕希; 矢田詩歩; 吉村倫一, 2021年度量子ビームサイエンスフェスタ(オンライン開催), SAXSとレオロジーによるアミノ酸-糖ハイブリッド界面活性剤の会合体特性, 07 Mar. 2022, 07 Mar. 2022, 09 Mar. 2022
  • 小林礼実; 岩瀬裕希; 矢田詩歩; 吉村倫一, 2021年度量子ビームサイエンスフェスタ(オンライン開催), SAXSを用いたアミノ酸-糖ハイブリッド界面活性剤が形成する会合体の構造解析, 07 Mar. 2022, 07 Mar. 2022, 09 Mar. 2022
  • 天野沙耶; 矢田詩歩; 吉村倫一, 2021年度量子ビームサイエンスフェスタ(オンライン開催), SANSによるリン酸エステル塩型アニオン界面活性剤が作る泡沫のミクロ構造解析, 07 Mar. 2022, 07 Mar. 2022, 09 Mar. 2022
  • 天野沙耶; 岩瀬裕希; 矢田詩歩; 吉村倫一, 2021年度量子ビームサイエンスフェスタ(オンライン開催), SAXSを用いたリン酸エステル塩型アニオン界面活性剤/四級アンモニウム塩系カチオン界面活性剤混合系の会合挙動, 07 Mar. 2022, 07 Mar. 2022, 09 Mar. 2022
  • 吉村倫一, R&Dセミナー, 乳化・可溶化の基礎知識と最新のエマルションの設計技術, 21 Jan. 2022, 21 Jan. 2022, 21 Jan. 2022
  • 吉村倫一, 油化学関連シンポジウム in 大阪-油化学の研究のおもしろさを知ろう!-(大阪工業大学梅田キャンパス), 洗浄・化粧品用界面活性剤の開発, 26 Dec. 2022, 2022
  • 吉村倫一, 情報機構セミナー, <基本概念から整理して高品質な調製を目指す>可溶化・乳化の調製・評価の実務, 17 Dec. 2021, 17 Dec. 2021, 17 Dec. 2021
  • 王珊; 矢田詩歩; 吉村倫一, 第72回コロイドおよび界面化学討論会(オンライン開催), 水素添加レシチンと単一鎖長ポリオキシエチレン系非イオン界面活性剤から成るリポソームおよび層構造によるクルクミンの可溶化, 17 Sep. 2021, 17 Sep. 2021, 17 Sep. 2021
  • 矢田詩歩; 際川香菜; 羽田容介; 澤木茂豊; 吉村倫一, 第72回コロイドおよび界面化学討論会(オンライン開催), アミノ酸−糖ハイブリッド界面活性剤の泡沫の安定性評価と中性子小角散乱によるミクロ構造解析, 17 Sep. 2021, 17 Sep. 2021, 17 Sep. 2021
  • 安部美季; 大畑哲也; 山田武; 矢田詩歩; 吉村倫一, 第72回コロイドおよび界面化学討論会(オンライン開催), ドデカン酸カリウムとジグリセリン誘導体混合系の泡沫特性におけるジグリセリン付加物の影響, 15 Sep. 2021, 17 Sep. 2021, 17 Sep. 2021
  • 小林礼実; 際川香菜; 岩瀬裕希; 羽羽田容介; 澤木茂豊; 矢田詩歩; 吉村倫一, 第72回コロイドおよび界面化学討論会(オンライン開催), SANSとSAXSを用いたアミノ酸−糖ハイブリッド界面活性剤ミセルの構造解析, 17 Sep. 2021, 15 Sep. 2021, 17 Sep. 2021
  • 中川真緒; 岡田篤; 片岡裕貴; 稲岡享; 矢田詩歩; 吉村倫一, 第72回コロイドおよび界面化学討論会(オンライン開催), ポリオキシエチレン系セカンダリー非イオン界面活性剤の水溶液物性と相挙動, 15 Sep. 2021, 15 Sep. 2021, 17 Sep. 2021
  • 河合里紗; 矢田詩歩; 吉村倫一, 第72回コロイドおよび界面化学討論会(オンライン開催), 四級アンモニウム塩系両親媒性イオン液体と界面活性剤混合系の気/水界面における吸着および水中での会合挙動, 15 Sep. 2021, 15 Sep. 2021, 17 Sep. 2021
  • 小林礼実; 佐々木勝行; 鯉江信慶; 遠藤亮; 原優介; 関口孝治; 矢田詩歩; 吉村倫一, 日本油化学会第60回年会(Web開催), ホスホリルコリン基を有するジェミニ型界面活性剤の水/油界面吸着と乳化特性, 06 Sep. 2021, 11 Sep. 2021, 11 Sep. 2021
  • 中川真緒; 岡田篤; 片岡裕貴; 稲岡享; 矢田詩歩; 吉村倫一, 日本油化学会第60回年会(Web開催), ポリオキシエチレン系セカンダリー非イオン界面活性剤による固体表面の濡れ性, 06 Sep. 2021, 11 Sep. 2021, 11 Sep. 2021
  • 大原梨乃; 矢田詩歩; 山本一裕; 大野泰弘; 松本武志; 細谷務; 吉村倫一, 日本油化学会第60回年会(Web開催), ポリエチレンイミン系高分子とアニオン界面活性剤LASの混合系の水溶液物性, 06 Sep. 2021, 11 Sep. 2021, 11 Sep. 2021
  • 河合里紗; 仁木舞子; 矢田詩歩; 吉村倫一, 日本油化学会第60回年会(Web開催), 四級アンモニウム塩系ジェミニ型両親媒性イオン液体を媒体としたポリオキシエチレン-ポリオキシプロピレン共重合体ジアルキルエーテルの吸着挙動とバルク特性, 06 Sep. 2021, 11 Sep. 2021, 11 Sep. 2021
  • 永田夕佳; 矢田詩歩; 吉村倫一, 日本油化学会第60回年会(Web開催), 末端基修飾型単一鎖長ポリオキシエチレン系非イオン界面活性剤の泡沫特性, 06 Sep. 2021, 11 Sep. 2021, 11 Sep. 2021
  • 矢田詩歩; 黒田瑞穂; 大野正司; 好田年成; 吉村倫一, 日本油化学会第60回年会(Web開催), 多分岐鎖を有する単一鎖長ポリオキシエチレン系非イオン界面活性剤の泡沫の安定性と中性子小角散乱による構造解析, 06 Sep. 2021, 11 Sep. 2021, 11 Sep. 2021
  • 水口裕惠; 矢田詩歩; 大野正司; 好田年成; 吉村倫一, 日本油化学会第60回年会(Web開催), 多分岐鎖を有するポリオキシエチレン系非イオン界面活性剤の泡沫特性, 06 Sep. 2021, 11 Sep. 2021, 11 Sep. 2021
  • 安部美季; 大畑哲也; 山田武; 矢田詩歩; 吉村倫一, 日本油化学会第60回年会(Web開催), ドデカン酸カリウムとジグリセリン誘導体混合系の界面吸着および会合体特性, 06 Sep. 2021, 06 Sep. 2021, 11 Sep. 2021
  • 天野沙耶; 川上隼人; 矢田詩歩; 吉村倫一, 日本油化学会第60回年会(Web開催), N-アシルアラニンのカルボキシ基にリン酸基を導入したアミノ酸系界面活性剤の吸着および会合体特性, 06 Sep. 2021, 06 Sep. 2021, 11 Sep. 2021
  • 小林礼実; 羽田容介; 澤木茂豊; 矢田詩歩; 吉村倫一, 日本油化学会第60回年会(Web開催), バリンとラクトビオン酸を用いたアミノ酸-糖ハイブリッド界面活性剤の合成と水溶液物性, 06 Sep. 2021, 06 Sep. 2021, 11 Sep. 2021
  • 吉村倫一, 情報機構セミナー, 界面活性剤の基礎と実践-乳化・可溶化・泡の基礎・メカニズムと設計技術、最新の評価・解析方法-, 18 Jun. 2021, 18 Jun. 2021, 18 Jun. 2021
  • 吉村倫一, 界面コロイドラーニング -第37回現代コロイド・界面化学基礎講座-, 基礎からの界面活性剤, 03 Jun. 2021, 03 Jun. 2021, 03 Jun. 2021
  • 中川真緒; 岡田篤; 稲岡享; 矢田詩歩; 吉村倫一, 第70回高分子学会年次大会(オンライオン開催), X 線小角散乱によるポリオキシエチレンセカンダリーアルキルエーテルミセルの構造解析, 27 May 2021, 26 May 2021, 28 May 2021
  • 吉村倫一, 技術情報協会セミナー, 泡の基礎:泡沫の生成・崩壊のメカニズムと構造・評価方法, 13 Apr. 2021, 13 Apr. 2021, 13 Apr. 2021
  • 矢田詩歩; 吉村倫一, ソフト界面科学研究会2020(オンラインZoom開催), 気/液界面における両親媒性物質の吸着挙動, 16 Mar. 2021
  • 中川真緒,岡田篤,稲岡享,矢田詩歩,吉村倫一, 第38回関西界面科学セミナー:若手・学生研究発表・討論会(オンライン開催), ポリオキシエチレンセカンダリーアルキルエーテル界面活性剤の気/液界面における吸着と固体表面の濡れ性, 09 Jan. 2021, 09 Jan. 2021, 09 Jan. 2021
  • 安部美季; 大畑哲也; 山田武; 矢田詩歩; 吉村倫一, 第38回関西界面科学セミナー:若手・学生研究発表・討論会(オンライン開催), ドデカン酸カリウムとジグリセリン誘導体混合系の吸着ダイナミクスと泡沫特性, 09 Jan. 2021, 09 Jan. 2021, 09 Jan. 2021
  • 吉村倫一, 情報機構セミナー(Zoomによるオンラインセミナー), 界面活性剤の基礎と実践-乳化・可溶化・泡の基礎・メカニズムと設計技術、最新の評価・解析方法-, 11 Dec. 2020, 11 Dec. 2020, 11 Dec. 2020
  • 吉村倫一, 日本油化学会第59回年会・界面化学特別講演(インターネットを活用したWeb開催), 高性能・高機能化を目指したアミノ酸-糖ハイブリッド界面活性剤の開発, 02 Nov. 2020, 07 Nov. 2020
  • 吉村倫一, 界面コロイドラーニング -第36回現代コロイド・界面化学基礎講座-(オンライン(ZOOM)開催), 界面活性剤:基礎からの界面活性剤, 29 Oct. 2020, 29 Oct. 2020, 30 Oct. 2020
  • 王珊,橋本悟,鈴木敏幸,矢田詩歩,吉村倫一, 日本油化学会第59回年会(インターネットを活用したWeb開催), 水素添加レシチンを用いたリポソームの特性に及ぼす単一鎖長ポリオキシエチレン系非イオン界面活性剤の影響, 02 Oct. 2020, 07 Oct. 2020
  • 中川真緒,河合里紗,岡田篤,稲岡享,矢田詩歩,吉村倫一, 日本油化学会第59回年会(インターネットを活用したWeb開催), ポリオキシエチレンセカンダリーアルキルエーテル界面活性剤の水溶液物性と相挙動, 02 Oct. 2020, 07 Oct. 2020
  • 河合里紗,仁木舞子,矢田詩歩,吉村倫一, 日本油化学会第59回年会(インターネットを活用したWeb開催), スペーサーに酸素または窒素を含む四級アンモニウム塩系ジェミニ型両親媒性イオン液体の水溶液物性とバルク特性, 02 Oct. 2020, 07 Oct. 2020
  • Shiho Yada; Hiroshi Shimosegawa; Hiroya Fujita; Yukako Matsue; Tomokazu Yoshimura, 日本油化学会第59回年会(インターネットを活用したWeb開催), Microstructural Characterization of Foam Formed by Amino Acid Surfactant with Hydroxy Group Using Small-Angle Neutron Scattering, 02 Oct. 2020, 07 Oct. 2020
  • 矢田詩歩,大原梨乃,河合里紗,大野泰弘,松本武志,細谷務,吉村倫一, 日本油化学会第59回年会(インターネットを活用したWeb開催), アニオン界面活性剤LASと高分子混合系の水溶液物性に及ぼす高分子構造の影響, 02 Oct. 2020, 07 Oct. 2020
  • 守田つかさ; 矢田詩歩; 吉村倫一, 日本油化学会第59回年会(インターネットを活用したWeb開催), 単一鎖長ポリオキシエチレン鎖を有するアルキルエーテル硫酸塩系界面活性剤の界面化学的性質, 02 Oct. 2020, 07 Oct. 2020
  • 吉村倫一,長野真季,矢田詩歩, 第69回高分子討論会(オンライオン開催), X線小角散乱を用いたポリオキシエチレン系非イオン両親媒性オリゴマーミセルの構造解析, 16 Sep. 2020, 14 Sep. 2020, 16 Sep. 2020
  • 王珊,橋本悟; 鈴木敏幸; 矢田詩歩; 吉村倫一, 第71回コロイドおよび界面化学討論会(オンライオン開催), 単一鎖長EO系非イオン界面活性剤と水素添加レシチンによるリポソームの特性, 14 Sep. 2020, 16 Sep. 2020
  • 河合里紗,矢田詩歩,吉村倫一, 第71回コロイドおよび界面化学討論会(オンライオン開催), 異種のアルキル鎖を有する四級アンモニウム塩系ジェミニ型両親媒性イオン液体を媒体とした非イオン界面活性剤のバルク特性, 14 Sep. 2020, 16 Sep. 2020
  • 矢田詩歩; 下瀬川紘; 藤田博也; 松江由香子; 吉村倫一, 第71回コロイドおよび界面化学討論会(オンライオン開催)2020年9月14日(月)~16日(水), 中性子小角散乱を用いたヒドロキシ基含有アミノ酸系界面活性剤によって安定化された泡沫のミクロ構造評価, 14 Sep. 2020, 16 Sep. 2020
  • 矢田詩歩,王珊,橋本悟,鈴木敏幸,吉村倫一, 日本薬剤学会第35年会(熊本・熊本城ホール), 水素添加レシチンと単一鎖長ポリオキシエチレン系非イオン界面活性剤混合系によるリポソームの創製, 14 May 2020, 16 May 2020
  • 吉村倫一, 情報機構セミナー(川崎市産業振興会館 川崎), 界面活性剤の基礎と実践~可溶化・乳化・泡のメカニズムと最新の評価・解析方法~, 20 Feb. 2020, 20 Feb. 2020, 20 Feb. 2020
  • R&Dセミナー, R&Dセミナー(江東区産業会館 東京), 乳化・可溶化の基礎知識と最新のエマルションの設計技術, 29 Jan. 2020, 29 Jan. 2020, 29 Jan. 2020
  • YOSHIMURA Tomokazu, 日本化学会第99春季年会(神戸・甲南大学岡本キャンパス), 種々のスペーサー構造を有するジェミニ型カチオン界面活性剤の気/液界面における吸着ダイナミクス, Mar. 2019, False
  • YOSHIMURA Tomokazu, 日本化学会第99春季年会(神戸・甲南大学岡本キャンパス), 中性子小角散乱によるアミノ酸系界面活性剤の泡沫の構造解析, Mar. 2019, False
  • YOSHIMURA Tomokazu, 日本化学会第99春季年会(神戸・甲南大学岡本キャンパス), アミノ酸-糖ハイブリッド界面活性剤の泡沫安定性, Mar. 2019, False
  • YOSHIMURA Tomokazu, 日本化学会第99春季年会(神戸・甲南大学岡本キャンパス), 多分岐アルキル鎖を有する四級アンモニウム塩系多鎖型界面活性剤の水溶液中における物性, Mar. 2019, False
  • YOSHIMURA Tomokazu, 日本化学会第99春季年会(神戸・甲南大学岡本キャンパス), ポリオキシエチレン系2鎖型非イオン界面活性剤の水溶液物性, Mar. 2019, False
  • YOSHIMURA Tomokazu, 日本化学会第99春季年会(神戸・甲南大学岡本キャンパス), 単一鎖長ポリオキシエチレン系非イオン界面活性剤の水溶液物性, Mar. 2019, False
  • YOSHIMURA Tomokazu, 日本化学会第99春季年会(神戸・甲南大学岡本キャンパス), ヒドロキシ基を有するN-アシルアミノ酸系アニオン界面活性剤と両性界面活性剤の混合水溶液における会合挙動, Mar. 2019, False
  • YOSHIMURA Tomokazu, 情報機構セミナー, <知っているようで知らない界面活性剤の基礎から学ぶ>乳化・可溶化のメカニズムとエマルションの設計技術、泡の基礎と評価方法, Feb. 2019, False
  • YOSHIMURA Tomokazu, R&Dセミナー(東京・商工情報センター), 乳化・可溶化の基礎と最新のエマルションの設計技術, Jan. 2019, False
  • YOSHIMURA Tomokazu, 日本中性子科学会第18回年会(水戸・茨城県立県民文化センター), 中性子小角散乱を用いたアミノ酸系界面活性剤の泡沫の構造解析, Dec. 2018, False
  • YOSHIMURA Tomokazu, 日本中性子科学会第18回年会(水戸・茨城県立県民文化センター), 分子構造に由来するアミノ酸系界面活性剤の泡沫安定性評価, Dec. 2018, False
  • YOSHIMURA Tomokazu, 中性子産業利用推進協議会・茨城県中性子利用研究会(東京・エッサム神田ホール), 界面活性剤が作る泡沫の中性子小角散乱, Dec. 2018, False
  • YOSHIMURA Tomokazu, 平成30年度油化学講演会「産学官-界面化学の三者三様」(四日市・四日市港ポートビル), 単一鎖長ポリオキシエチレン系非イオン界面活性剤の開発:末端基修飾型・多分岐鎖型・オリゴマー型, Nov. 2018, False
  • YOSHIMURA Tomokazu, 第9回イオン液体討論会(米子・米子コンベンションセンターBiG SHiP), 種々の構造の四級アンモニウム塩系新規両親媒性イオン液体の開発, Oct. 2018, False
  • YOSHIMURA Tomokazu, 第9回イオン液体討論会(米子・米子コンベンションセンターBiG SHiP), 四級アンモニウム塩系ジェミニ型イオン液体中におけるポリオキシエチレン-ポリオキシプロピレン共重合体ジアルキルエーテルの界面吸着と層挙動, Oct. 2018, False
  • YOSHIMURA Tomokazu, 日本油化学会第57回年会・主題シンポジウム「産学官シーズとニーズのマッチングシンポジウム」(神戸・神戸学院大学), ヒドロキシ基含有アミノ酸系界面活性剤:希薄および濃厚溶液における界面化学的性質, Sep. 2018, False
  • YOSHIMURA Tomokazu, 日本油化学会第57回年会(神戸・神戸学院大学), 多分岐アルキル鎖を有する四級アンモニウム塩系ジェミニ型界面活性剤の水溶液物性, Sep. 2018, False
  • YOSHIMURA Tomokazu, 日本油化学会第57回年会(神戸・神戸学院大学), トリメリック型カチオン界面活性剤の界面吸着に及ぼす分子構造の影響, Sep. 2018, False
  • YOSHIMURA Tomokazu, 日本油化学会第57回年会(神戸・神戸学院大学), 四級アンモニウム塩系両親媒性イオン液体と界面活性剤の混合水溶液系における表面吸着挙動, Sep. 2018, False
  • YOSHIMURA Tomokazu, 日本油化学会第57回年会(神戸・神戸学院大学), アミノ酸-糖ハイブリッド界面活性剤を用いたエマルションの調製と物性, Sep. 2018, False
  • YOSHIMURA Tomokazu, 日本油化学会第57回年会(神戸・神戸学院大学), ポリオキシエチレン-ポリオキシプロピレン共重合体デシルテトラデシルエーテル系非イオン界面活性剤ミセルの可溶化, Sep. 2018, False
  • YOSHIMURA Tomokazu, 日本油化学会第57回年会(神戸・神戸学院大学), 中性子小角散乱を用いたヒドロキシ基含有アミノ酸系界面活性剤の泡沫の構造解析, Sep. 2018, False
  • YOSHIMURA Tomokazu, 第69回コロイドおよび界面化学討論会(つくば・筑波大学筑波キャンパス), 多分岐鎖を有する単一鎖長ポリオキシエチレン系非イオン界面活性剤が形成する会合体のSAXSとSANSによる構造解析, Sep. 2018, False
  • YOSHIMURA Tomokazu, 第69回コロイドおよび界面化学討論会(つくば・筑波大学筑波キャンパス), 四級アンモニウム塩系両親媒性イオン液体と界面活性剤の2成分系および水を含む3成分系における表面吸着と会合挙動, Sep. 2018, False
  • YOSHIMURA Tomokazu, 第69回コロイドおよび界面化学討論会(つくば・筑波大学筑波キャンパス), 四級アンモニウム塩系ジェミニ型イオン液体と単一鎖長ポリオキシエチレン系非イオン界面活性剤の2成分系における表面吸着および会合挙動, Sep. 2018, False
  • YOSHIMURA Tomokazu, 第69回コロイドおよび界面化学討論会(つくば・筑波大学筑波キャンパス), アミノ酸‐糖ハイブリッド界面活性剤の水溶液中における会合体特性, Sep. 2018, False
  • YOSHIMURA Tomokazu, 第69回コロイドおよび界面化学討論会(つくば・筑波大学筑波キャンパス), アダマンタン構造を有する四級アンモニウム塩系イオン液体の物性とイオン液体を媒体とした非イオン界面活性剤の表面吸着および会合挙動, Sep. 2018, False
  • YOSHIMURA Tomokazu, 第69回コロイドおよび界面化学討論会(つくば・筑波大学筑波キャンパス), ヒドロキシ基含有アミノ酸系界面活性剤が形成する泡沫の中性子小角散乱による構造解析, Sep. 2018, False
  • YOSHIMURA Tomokazu, 第69回コロイドおよび界面化学討論会(つくば・筑波大学筑波キャンパス), 直鎖状および星状四級アンモニウム塩系トリメリック型界面活性剤の界面吸着に及ぼす分子構造の影響, Sep. 2018, False
  • YOSHIMURA Tomokazu, 第69回コロイドおよび界面化学討論会(つくば・筑波大学筑波キャンパス), 多分岐アルキル鎖を有する単一鎖長ポリオキシエチレンアルキルエーテル硫酸塩の合成と水溶液物性, Sep. 2018, False
  • YOSHIMURA Tomokazu, 日本油化学会2018年若手の会サマースクール(伊東・ライオン伊豆高原研修センター), 単一鎖長ポリオキシエチレン系非イオン界面活性剤~水溶液およびイオン液体中での挙動~, Aug. 2018, False
  • YOSHIMURA Tomokazu, SPring-8シンポジウム2018サテライト研究会(姫路・姫路市市民会館), 界面活性剤が形成する会合体のX線小角散乱による評価, Aug. 2018, False
  • YOSHIMURA Tomokazu, 日本油化学会オレオマテリアル部会・第2回オレオマテリアル学術交流会(熱海・伊豆山研修センター), N-アシル-N-(2-ヒドロキシエチル)-β-アラニン塩のアミノ酸系界面活性剤:特異な界面吸着とミセル形成, Aug. 2018, False
  • YOSHIMURA Tomokazu, 日本油化学会オレオマテリアル部会・第2回オレオマテリアル学術交流会(熱海・伊豆山研修センター), 2本の多分岐鎖を有する単一鎖長ポリオキシエチレン系非イオン界面活性剤の開発, Aug. 2018, False
  • YOSHIMURA Tomokazu, 情報機構セミナー(東京・太陽化学(株)東京本社), <知っているようで知らない!界面活性剤の基礎から学ぶ>乳化・可溶化のメカニズムからエマルションの設計技術まで, Aug. 2018, False
  • YOSHIMURA Tomokazu, 第36回関西界面科学セミナー(吹田・関西大学千里山キャンパス), 直鎖状および星状四級アンモニウム塩系トリメリック型界面活性剤の界面吸着と会合体特性, Jul. 2018, False
  • YOSHIMURA Tomokazu; Risa Kawai; Shiho Yada; Tomokazu Yoshimura; Satoru Hashimoto; Toshiyuki Suzuki, 8th International Colloids Conference(Shanghai, China), Properties of quaternary ammonium salt-type gemini ionic liquids and surface adsorption behavior of polyoxyethylene-type nonionic surfactant in ionic liquid, Jun. 2018, True
  • YOSHIMURA Tomokazu; Hiroki Iwase; Ken Morishima; Tomokazu Yoshimura; Shinichi Takata; Mitsuhiro Shibayama, 8th International Colloids Conference(Shanghai, China), Rheo-SANS study for shear-thickening observed in gemini-type cationic surfactant solutions, Jun. 2018, True
  • YOSHIMURA Tomokazu; Shiho Yada; Yuiko Yoshioka; Tomokazu Yoshimura; Toshinari Koda, 8th International Colloids Conference(Shanghai, China), Adsorption and aggregation properties of homogeneous polyoxyethylene type nonionic surfactants with two multi-branched chains, Jun. 2018, True
  • YOSHIMURA Tomokazu; Shiho Yada; Miyako Wakizaka; Tomokazu Yoshimura; Hiroshi Shimosegawa; Hiroya Fujita; Yukako Matsue, 8th International Colloids Conference(Shanghai, China), Unique adsorption behavior at air/water interface of amino acid-type surfactants of N-acyl-N-(2hydroxyethyl)-β-alanine with hydroxy group, Jun. 2018, True
  • YOSHIMURA Tomokazu, 界面コロイドラーニング‐第34回現代コロイド・界面化学基礎講座(大阪会場)(大阪・ドーンセンター), 界面活性剤:基礎からの界面活性剤, Jun. 2018, False
  • YOSHIMURA Tomokazu; Shiho Yada; Tomokazu Yoshimura; Satoru Hashimoto; Toshiyuki Suzuki, 16th Conference of the International Association of Colloid and Interface Scientists (IACIS)(Rotterdam, the Netherlands), Aggregation behavior of homogeneous polyoxyethylene type nonionic surfactants modified with terminal group, May 2018, True
  • YOSHIMURA Tomokazu; Shiho Yada; Yuiko Yoshioka; Tomokazu Yoshimura; Toshinari Koda, 16th Conference of the International Association of Colloid and Interface Scientists (IACIS)(Rotterdam, the Netherlands), Aggregation behavior of homogeneous polyoxyethylene type nonionic surfactants with multi-branched chains, May 2018, True
  • YOSHIMURA Tomokazu; Risa Kawai; Tomokazu Yoshimura, IUPAC Workshop Advances in Analytical Chemistry II(Nara Women's University, Nara, Japan), Properties of Quaternary Ammonium Salt-Type Ionic liquids with Adamantyl Group, Apr. 2018, True
  • YOSHIMURA Tomokazu; Yuri Matsumoto; Tomokazu Yoshimura, IUPAC Workshop Advances in Analytical Chemistry II(Nara Women's University, Nara, Japan), Solution Properties of Quaternary Ammonium Salt-Type Gemini Surfactants with Branched Alkyl Chains, Apr. 2018, True
  • YOSHIMURA Tomokazu, 日本化学会第98春季年会(船橋・日本大学理工学部船橋キャンパス), ヒドロキシ基を有するN-アシル-N-(2-ヒドロキシエチル)-β-アラニン塩アミノ酸系界面活性剤の開発, Mar. 2018, False
  • YOSHIMURA Tomokazu, 日本化学会第98春季年会(船橋・日本大学理工学部船橋キャンパス), 多分岐鎖を有する単一鎖長ポリオキシエチレン系非イオン界面活性剤の開発, Mar. 2018, False
  • YOSHIMURA Tomokazu, 日本化学会第98春季年会(船橋・日本大学理工学部船橋キャンパス), Development of Quaternary Ammonium Salt-Type Novel Ionic Liquids and Properties of Surfactants in Ionic Liquids, Mar. 2018, False
  • YOSHIMURA Tomokazu, 日本化学会第98春季年会(船橋・日本大学理工学部船橋キャンパス), 末端基修飾型ポリオキシエチレン系非イオン界面活性剤を保護剤に用いた金ナノ粒子の構造と触媒活性, Mar. 2018, False
  • YOSHIMURA Tomokazu, 日本化学会第98春季年会(船橋・日本大学理工学部船橋キャンパス), 単一鎖長ポリオキシエチレン系非イオン界面活性剤の四級アンモニウム塩系ジェミニ型イオン液体中における界面化学的性質, Mar. 2018, False
  • YOSHIMURA Tomokazu, 日本化学会第98春季年会(船橋・日本大学理工学部船橋キャンパス), ポリオキシエチレン-ポリオキシプロピレン共重合体デシルテトラデシルエーテル系非イオン界面活性剤の水溶液物性, Mar. 2018, False
  • YOSHIMURA Tomokazu, 日本化学会第98春季年会(船橋・日本大学理工学部船橋キャンパス), 四級アンモニウム塩系イオン液体/界面活性剤/水の3成分系におけるイオン液体と界面活性剤の表面吸着挙動, Mar. 2018, False
  • YOSHIMURA Tomokazu, 日本化学会第98春季年会(船橋・日本大学理工学部船橋キャンパス), ヒドロキシ基を有するN-アシル-N-(2-ヒドロキシエチル)-β-アラニン塩アミノ酸系界面活性剤の界面吸着に及ぼす水素結合の効果, Mar. 2018, False
  • YOSHIMURA Tomokazu, 日本化学会第98春季年会(船橋・日本大学理工学部船橋キャンパス), アミノ酸-糖ハイブリッド界面活性剤の水溶液物性, Mar. 2018, False
  • YOSHIMURA Tomokazu, 石けん洗剤技術交流会(大阪・ホテル大阪ベイタワー), 高性能化を目指した新規界面活性剤の開発 -構造と物性との関係-, Dec. 2017, 石けん洗剤技術交流会, ホテル大阪ベイタワー・22階白雲の間(大阪), False
  • YOSHIMURA Tomokazu, 日本油化学会オレオマテリアル部会・第1回 オレオマテリアル学術交流会(東京・東京理科大学神楽坂キャンパス), 種々の末端基をもつ単一鎖長ポリオキシエチレン系非イオン界面活性剤の水溶液物性, Nov. 2017, 東京・東京理科大学神楽坂キャンパス, False
  • YOSHIMURA Tomokazu, 第8回イオン液体討論会(小金井(東京)・東京農工大学小金井キャンパス), 種々のスペーサー構造を有する四級アンモニウム塩系ジェミニ型イオン液体中における単一鎖長ポリオキシエチレン系非イオン界面活性剤の挙動, Nov. 2017, 小金井(東京)・東京農工大学小金井キャンパス, False
  • YOSHIMURA Tomokazu, 第8回イオン液体討論会(小金井(東京)・東京農工大学小金井キャンパス), 四級アンモニウム塩系イオン液体/界面活性剤/水の3成分系における表面吸着挙動, Nov. 2017, 小金井(東京)・東京農工大学小金井キャンパス, False
  • YOSHIMURA Tomokazu; Shiho Yada; Tomokazu Yoshimura; Satoru Hashimoto; Toshiyuki Suzuki, The 8th International Symposium on Surface Science (ISSS-8)(Tsukuba International Congress Center, Tsukuba, Japan), Static and Dynamic Adsorption at Air-Water Interface for Homogeneous Polyoxypropylene-Polyoxyethylene Type Nonionic Surfactants, Oct. 2017, Tsukuba International Congress Center, Tsukuba, True
  • YOSHIMURA Tomokazu; Risa Kawai; Shiho Yada; Tomokazu Yoshimura; Satoru Hashimoto; Toshiyuki Suzuki, The 8th International Symposium on Surface Science (ISSS-8)(Tsukuba International Congress Center, Tsukuba, Japan), Surface Adsorption Behavior of Nonionic and Ionic Surfactants in Quaternary Ammonium Salt-type Ionic Liquids, Oct. 2017, Tsukuba International Congress Center, Tsukuba, True
  • YOSHIMURA Tomokazu, 第68回コロイドおよび界面化学討論会(神戸・神戸大学鶴甲第1キャンパス), 分岐2鎖型界面活性剤の水溶液物性に及ぼす親水基と疎水鎖の影響, Sep. 2017, 神戸・神戸大学鶴甲第1キャンパス, False
  • YOSHIMURA Tomokazu, 第68回コロイドおよび界面化学討論会(神戸・神戸大学鶴甲第1キャンパス), ヒドロキシ基を有するN‐アシル‐N‐(2‐ヒドロキシエチル)‐β‐アラニン塩のアミノ酸系界面活性剤の界面吸着とミセル特性, Sep. 2017, 神戸・神戸大学鶴甲第1キャンパス, False
  • YOSHIMURA Tomokazu, 第68回コロイドおよび界面化学討論会(神戸・神戸大学鶴甲第1キャンパス), 種々の末端基をもつ単一鎖長ポリオキシエチレン系非イオン界面活性剤が形成する会合体のSAXSとSANSによる構造解析, Sep. 2017, 神戸・神戸大学鶴甲第1キャンパス, False
  • YOSHIMURA Tomokazu, 第68回コロイドおよび界面化学討論会(神戸・神戸大学鶴甲第1キャンパス), Rheo-SANSによるジェミニ型界面活性剤水溶液が示すshear-thickening挙動の解析, Sep. 2017, 神戸・神戸大学鶴甲第1キャンパス, False
  • YOSHIMURA Tomokazu, 第68回コロイドおよび界面化学討論会(神戸・神戸大学鶴甲第1キャンパス), 四級アンモニウム塩系両親媒性イオン液体中における非イオンおよびイオン性界面活性剤の表面吸着挙動, Sep. 2017, 神戸・神戸大学鶴甲第1キャンパス, False
  • YOSHIMURA Tomokazu, 第68回コロイドおよび界面化学討論会(神戸・神戸大学鶴甲第1キャンパス), アミノ酸‐糖ハイブリッド界面活性剤の界眼面吸着と会合体特性, Sep. 2017, 神戸・神戸大学鶴甲第1キャンパス, False
  • YOSHIMURA Tomokazu, 第68回コロイドおよび界面化学討論会(神戸・神戸大学鶴甲第1キャンパス), 種々のスペーサーを有する四級アンモニウム塩系ジェミニ型イオン液体を媒体とした単一鎖長ポリオキシエチレン系非イオン界面活性剤の物性, Sep. 2017, 神戸・神戸大学鶴甲第1キャンパス, False
  • YOSHIMURA Tomokazu, The Asian Conference on Oleo Science (ACOS) 2017 & 第56回日本油化学会年会(東京・東京理科大学神楽坂キャンパス), 四級アンモニウム塩系トリメリック型両親媒性イオン液体の合成・物性と水溶液中での界面化学的性質, Sep. 2017, 東京・東京理科大学神楽坂キャンパス, False
  • YOSHIMURA Tomokazu, The Asian Conference on Oleo Science (ACOS) 2017 & 第56回日本油化学会年会(東京・東京理科大学神楽坂キャンパス), アミノ酸-糖ハイブリッド界面活性剤の合成と界面化学的性質, Sep. 2017, 東京・東京理科大学神楽坂キャンパス, False
  • YOSHIMURA Tomokazu, The Asian Conference on Oleo Science (ACOS) 2017 & 第56回日本油化学会年会(東京・東京理科大学神楽坂キャンパス), N-アシル-N-(2-ヒドロキシエチル)‐β‐アラニン塩のアミノ酸系界面活性剤の気液界面における吸着ダイナミクス, Sep. 2017, 東京・東京理科大学神楽坂キャンパス, False
  • YOSHIMURA Tomokazu, The Asian Conference on Oleo Science (ACOS) 2017 & 第56回日本油化学会年会(東京・東京理科大学神楽坂キャンパス), 多分岐鎖を有する単一鎖長ポリオキシエチレン系非イオン性界面活性剤の界面吸着と会合体特性, Sep. 2017, 東京・東京理科大学神楽坂キャンパス, False
  • YOSHIMURA Tomokazu, The Asian Conference on Oleo Science (ACOS) 2017 & 第56回日本油化学会年会(東京・東京理科大学神楽坂キャンパス), N?アシル?N?(2?ヒドロキシエチル)? β ?アラニン塩のアミノ酸系界面活性剤の気/液および液/液界面における吸着挙動の解明, Sep. 2017, 東京・東京理科大学神楽坂キャンパス, False
  • YOSHIMURA Tomokazu, 奈良女子大学 新技術説明会(東京・JST東京本部別館1Fホール), 各種産業分野への利用を目指した新規界面活性剤の開発, Sep. 2017, 科学技術振興機構・奈良女子大学, JST東京本部別館1Fホール(東京), False
  • YOSHIMURA Tomokazu, The Asian Conference on Oleo Science (ACOS) 2017 & 第56回日本油化学会年会(東京・東京理科大学神楽坂キャンパス), 各種エチレンアミン誘導体をスペーサーに用いた四級アンモニウム塩系ジェミニ型イオン液体の性質と水溶液中での物性, Sep. 2017, 東京・東京理科大学神楽坂キャンパス, False
  • YOSHIMURA Tomokazu; Keisuke Matsuoka; Rinpei Omori; Shiho Yada; Tomokazu Yoshimura, The Asian Conference on Oleo Science (ACOS) 2017 & 第56回日本油化学会年会(東京・東京理科大学神楽坂キャンパス), Micellar Structure and Solubilization Ability of N,N-Dimethyl-N-Alkyladamanthylammonium Bromide, Sep. 2017, 東京・東京理科大学神楽坂キャンパス, False
  • YOSHIMURA Tomokazu, 第2回小角X線散乱による評価技術開発研究会(名古屋・科学技術交流財団 研究交流センター), 小角散乱による界面活性剤集合体の構造解析, Sep. 2017, 公益財団法人科学技術交流財団, 科学技術交流財団 研究交流センター(ウインクあいち15階)(名古屋), False
  • YOSHIMURA Tomokazu, 第66回高分子学会年次大会(千葉・幕張メッセ), フッ化炭素鎖を有するハイブリッドジェミニ型界面活 性剤が形成するミセルの構造とレオロジー, Jun. 2017, False
  • YOSHIMURA Tomokazu; Tomokazu Yoshimura; Maki Nagano; Shiho Yada, 7th International Colloids Conference(Hotel Melia, Sitges (near Barcelona), Spain), Nonionic amphiphilic oligomers with multi-polyoxyethylene side chains and one alkyl chain: Adsorption and aggregation properties, Jun. 2017, False
  • YOSHIMURA Tomokazu; Shiho Yada; Tomokazu Yoshimura, 7th International Colloids Conference(Hotel Melia, Sitges (near Barcelona), Spain), Homogeneous polyoxyethylene type nonionic surfactants with alkoxy or polyoxypropylene terminal group: adsorption and aggregation properties, Jun. 2017, False
  • YOSHIMURA Tomokazu, 第35回関西界面科学セミナー「不思議な界面を創る・調べる・使う-メゾスコピック界面の設計とその挙動-」(神戸・神戸大学瀧川記念学術交流会館), 新規な構造をもつ界面活性剤の界面吸着挙動と分子集合体の構造, Jun. 2017, False
  • YOSHIMURA Tomokazu, 第66回高分子学会年次大会(千葉・幕張メッセ), ヒドロキシ基およびメトキシ基末端のポリオキシエチレン側鎖 を有する両親媒性オリゴマーの分子集合体のナノ構造, May 2017, False
  • YOSHIMURA Tomokazu, 第66回高分子学会年次大会(千葉・幕張メッセ), 末端基修飾型単一鎖長ポリオキシエチレン系非イオン界面 活性剤の分子集合体のナノ構造, May 2017, False
  • YOSHIMURA Tomokazu, 日本顕微鏡学会第73回学術講演会・シンポジウム「最先端計測共用を通じた産業と学問の融合」(札幌・札幌コンベンションセンター), Cryo-TEMによる界面活性剤の分子集合体の構造解析, May 2017, False
  • YOSHIMURA Tomokazu, 日本顕微鏡学会第73回学術講演会(札幌・札幌コンベンションセンター), 種々のポリオキシエチレン系非イオン界面 活性剤が形成する分子集合体のナノ構造, May 2017, False
  • YOSHIMURA Tomokazu, 日本化学会第97春季年会(横浜・慶應義塾大学日吉キャンパス), Development of quaternary ammonium salt-type novel amphiphilic ionic liquid, Mar. 2017
  • YOSHIMURA Tomokazu, 日本化学会第97春季年会(横浜・慶應義塾大学日吉キャンパス), 単一鎖長ポリオキシエチレン系非イオン界面活性剤の溶液内ナノ構造に及ぼす末端基構造の影響, Mar. 2017, False
  • YOSHIMURA Tomokazu, 日本化学会第97春季年会(横浜・慶應義塾大学日吉キャンパス), 四級アンモニウム塩系イオン液体を媒体とした非イオン界面活性剤の特異な表面吸着挙動, Mar. 2017, False
  • YOSHIMURA Tomokazu, 日本化学会第97春季年会(横浜・慶應義塾大学日吉キャンパス), 2本の分岐鎖を有する四級アンモニウム塩系カチオン界面活性剤の合成と水溶液物性, Mar. 2017, False
  • YOSHIMURA Tomokazu, 日本化学会第97春季年会(横浜・慶應義塾大学日吉キャンパス), 種々のスペーサー構造を有する四級アンモニウム塩系ジェミニ型イオン液体の合成と物性, Mar. 2017, False
  • YOSHIMURA Tomokazu, 日本化学会第97春季年会(横浜・慶應義塾大学日吉キャンパス), N-アシル-N-(2-ヒドロキシエチル)-β-アラニン塩アミノ酸系界面活性剤のヒドロキシ基が与える特異な界面吸着挙動, Mar. 2017, False
  • YOSHIMURA Tomokazu; Shiho Yada; Tomokazu Yoshimura, The 11th SPSJ International Polymer Conference (IPC 2016)(Fukuoka International Congress Center, Fukuoka, Japan), Nano-structural analysis of aggregates formed by homogeneous polyoxyethylene type nonionic surfactants with methoxy or ethoxy terminal group, Dec. 2016, True
  • YOSHIMURA Tomokazu; Maki Nagano; Shiho Yada; Tomokazu Yoshimura, The 11th SPSJ International Polymer Conference (IPC 2016)(Fukuoka International Congress Center, Fukuoka, Japan), Nano-structural analysis of aggregates formed by single-alkyl chain containing nonionic amphiphilic oligomers with multi-polyoxyethylene side chains, Dec. 2016, True
  • YOSHIMURA Tomokazu, 2016年度色材研究発表会(大阪・大阪大学豊中キャンパス), アダマンチル基を有する四級アンモニウム塩系イオン液体の性質とイオン液体中における非イオン界面活性剤の物性, Oct. 2016, False
  • YOSHIMURA Tomokazu, 2016年度色材研究発表会(大阪・大阪大学豊中キャンパス), ヒドロキシ基を有するアシルヒドロキシエチル-β-アラニン塩アミノ酸系界面活性剤の水溶液物性, Oct. 2016, False
  • YOSHIMURA Tomokazu, 2016年度色材研究発表会(大阪・大阪大学豊中キャンパス), アルコキシ基修飾ポリオキシエチレン系非イオン界面活性剤が形成する会合体と金ナノ粒子の構造解析, Oct. 2016, False
  • YOSHIMURA Tomokazu, 第7回イオン液体討論会(金沢・金沢市文化ホール), 四級アンモニウム塩系新規イオン液体中における単一鎖長ポリオキシエチレン系非イオン界面活性剤:界面化学的性質, Oct. 2016, False
  • YOSHIMURA Tomokazu, 第7回イオン液体討論会(金沢・金沢市文化ホール), 四級アンモニウム塩系新規イオン液体中における単一鎖長ポリオキシエチレン系非イオン界面活性剤:X線小角散乱によるナノ構造, Oct. 2016, False
  • YOSHIMURA Tomokazu; Seiya Sugawara; Ken Morishima; Tomokazu Yoshimura; Mitsuhiro Shibayama, IRC 2016 Kitakyushu(国際ゴム技術会議 北九州)(北九州,北九州国際会議場), Rheological behavior of aqueous micellar solution of fluorinated gemini surfactant, Oct. 2016, True
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), X線小角散乱を用いた界面活性剤分子集合体のナノ構造(招待講演), Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), アシルヒドロキシエチル-β-アラニン塩アミノ酸系界面活性剤:単独系および混合系の性質(招待講演), Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), 単一鎖長トリ・ヘキサ・ノナオキシエチレン側鎖を有する両親媒性オリゴマーの界面化学的性質, Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), アダマンチル基を有する四級アンモニウム塩系イオン液体の合成と物性, Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), フッ化炭素鎖を含むジェミニ型界面活性剤水溶液が示すレオロジー挙動, Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), 胆汁酸塩を保護剤とした金属ナノ粒子の合成と抗酸化能の評価, Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), トリメリック型カチオン界面活性剤の水中でのミセル構造に及ぼす分子構造の影響, Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), アシルヒドロキシエチル-β-アラニン塩アミノ酸系界面活性剤:合成と水溶液物性, Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), アシルヒドロキシエチル-β-アラニン塩アミノ酸系界面活性剤:界面物性とミセル特性, Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), 単一鎖長ポリオキシエチレン系非イオン界面活性剤の水溶液物性に及ぼす末端基構造の影響, Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), 2本の分岐アルキル鎖を有する単一鎖長ポリオキシエチレン系非イオン界面活性剤の合成と水溶液物性, Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), アミノ酸-糖ハイブリッド界面活性剤の合成と物性, Sep. 2016, False
  • YOSHIMURA Tomokazu, 日本油化学会第55回年会(奈良・奈良女子大学), エチレンアミン誘導体を用いたジェミニ型イオン液体の合成と物性, Sep. 2016, False
  • YOSHIMURA Tomokazu, 第67回コロイドおよび界面化学討論会(旭川・北海道教育大学旭川校), 単一鎖長ポリオキシプロピレン‐ポリオキシエチレン系非イオン性界面活性剤‐特異な物性発現とミセル構造‐(招待講演), Sep. 2016, False
  • YOSHIMURA Tomokazu, 第67回コロイドおよび界面化学討論会(旭川・北海道教育大学旭川校), アシルヒドロキシエチル-β-アラニン塩アミノ酸系界面活性剤:水溶液における会合挙動, Sep. 2016, False
  • YOSHIMURA Tomokazu, 第67回コロイドおよび界面化学討論会(旭川・北海道教育大学旭川校), アシルヒドロキシエチル-β-アラニン塩アミノ酸系界面活性剤:各種アミノ酸系界面活性剤との混合系における物性および会合挙動, Sep. 2016, False
  • YOSHIMURA Tomokazu, 第67回コロイドおよび界面化学討論会(旭川・北海道教育大学旭川校), 四級アンモニウム塩系新規イオン液体中における単一鎖長ポリオキシエチレン系非イオン界面活性剤の表面物性, Sep. 2016, False
  • YOSHIMURA Tomokazu, 第67回コロイドおよび界面化学討論会(旭川・北海道教育大学旭川校), アルコキシ基修飾ポリオキシエチレン系非イオン界面活性剤の分子集合体のナノ構造解析, Sep. 2016, False
  • YOSHIMURA Tomokazu, 第67回コロイドおよび界面化学討論会(旭川・北海道教育大学旭川校), ヒドロキシ基およびメトキシ基末端のポリオキシエチレン側鎖を有する両親媒性オリゴマーが形成する会合体の構造解析, Sep. 2016, False
  • YOSHIMURA Tomokazu, 第67回コロイドおよび界面化学討論会(旭川・北海道教育大学旭川校), 2本の分岐アルキル鎖を有するカルボン酸型アニオン界面活性剤の水溶液物性, Sep. 2016, False
  • YOSHIMURA Tomokazu, 第65回高分子学会年次大会(神戸・神戸国際会議場・展示場), 単一鎖長トリオキシエチレン側鎖を有する低重合度両親媒性オリゴマーが形成する会合体の構造解析, May 2016
  • YOSHIMURA Tomokazu, 第65回高分子学会年次大会(神戸・神戸国際会議場・展示場), 金ナノ粒子の構造と触媒活性に及ぼす保護剤としての非イオン性界面活性剤の影響, May 2016
  • YOSHIMURA Tomokazu, 第65回高分子学会年次大会(神戸・神戸国際会議場・展示場), フッ化炭素鎖を含むジェミニ型界面活性剤の構造とレオロジー挙動, May 2016
  • YOSHIMURA Tomokazu, 2015年度量子ビームサイエンスフェスタ(つくば・つくば国際会議場(エポカルつくば)), SAXSとXAFSによるEO系およびPO-EO系非イオン性界面活性剤保護金ナノ粒子の構造解析, Mar. 2016, False
  • YOSHIMURA Tomokazu, 2015年度量子ビームサイエンスフェスタ(つくば・つくば国際会議場(エポカルつくば)), X線小角散乱によるEO系非イオン性両親媒性オリゴマーが形成するミセルの構造解析, Mar. 2016, False
  • YOSHIMURA Tomokazu, 第27回高分子ゲル研究討論会(東京・東京大学山上会館), 炭化水素鎖およびフッ化炭素鎖をもつジェミニ型界面活性剤が形成するミセルの構造と物性, Jan. 2016, False
  • YOSHIMURA Tomokazu; T.Yoshimura; A.Morishima; A.Okuda, The International Chemical Congress of Pacific Basin Societies (PACIFICHEM 2015)(Honolulu, Hawaii, USA), Adsorption and aggregation properties of hydrocarbon-fluorocarbon hybrid-type gemini surfactants with carboxylates or quaternary ammonium salts, Dec. 2015, False
  • YOSHIMURA Tomokazu; S.Yada; T.Yoshimura, The International Chemical Congress of Pacific Basin Societies (PACIFICHEM 2015)(Honolulu, Hawaii, USA), Adsorption and aggregation properties of homogeneous polyoxypropylene-polyoxyethylene type nonionic surfactants without molecular weight distribution, Dec. 2015, False
  • YOSHIMURA Tomokazu; K.Akutsu; H.Iwase; Y.Nakatani; T.Yoshimura, The International Chemical Congress of Pacific Basin Societies (PACIFICHEM 2015)(Honolulu, Hawaii, USA), Structural study of gold nanoparticles with sugar-type surfactant using SANS, SAXS, and XAFS methods, Dec. 2015, False
  • YOSHIMURA Tomokazu; K.Matsuoka; R.Miyajima; T.Yoshimura, 6th Asian Conference on Colloid and Interface Science (ACCIS 2015)(Arkas Sasebo, Sasebo, Japan), Aggregation formation of glycyrrhizic acids, Nov. 2015, False
  • YOSHIMURA Tomokazu; T.Yoshimura; Y.Nakatani; K.Matsuoka; K.Akutsu; H.Iwase, 6th Asian Conference on Colloid and Interface Science (ACCIS 2015)(Arkas Sasebo, Sasebo, Japan), Surface-active properties of single-alkyl chain and multi-alkyl chains containing amphiphilic oligomers with several sugar side chains, Nov. 2015, False
  • YOSHIMURA Tomokazu; S.Yada; T.Yoshimura, 6th Asian Conference on Colloid and Interface Science (ACCIS 2015)(Arkas Sasebo, Sasebo, Japan), Synthesis and solution properties of homogeneous polyoxypropylene-polyoxyethylene type nonionic surfactants, Nov. 2015, False
  • YOSHIMURA Tomokazu, 第5回CSJ化学フェスタ2015(東京・タワーホール船堀), 単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤の水溶液中における特異な物性発現, Oct. 2015, False
  • YOSHIMURA Tomokazu, 2015年度色材研究発表会(千葉・千葉工業大学), 単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤を保護剤に用いた金ナノ粒子の構造解析と触媒活性, Oct. 2015, False
  • YOSHIMURA Tomokazu, 2015年度色材研究発表会(千葉・千葉工業大学), トリス(アミノアルキル)アミン骨格のスター状トリメリック型界面活性剤が水溶液中で形成する会合体のナノ構造解析, Oct. 2015, False
  • YOSHIMURA Tomokazu, 第6回イオン液体討論会(京都・同志社大学), 四級アンモニウム塩系ジェミニ型イオン液体の合成・物性と水溶液中における界面化学的性質, Oct. 2015, False
  • YOSHIMURA Tomokazu, 日本油化学会第54回年会(愛知・名城大学), 側鎖にポリオキシエチレン鎖を有する単鎖型非イオン性両親媒性オリゴマーの合成と水溶液物性, Sep. 2015, False
  • YOSHIMURA Tomokazu, 日本油化学会第54回年会(愛知・名城大学), トリス(3-アミノプロピル)アミンから誘導したスター状トリメリック型カチオン界面活性剤の水溶液物性と会合挙動, Sep. 2015, False
  • YOSHIMURA Tomokazu, 日本油化学会第54回年会(愛知・名城大学), 短鎖アルキル基を有する四級アンモニウム塩系ジェミニ型イオン液体の合成と物性, Sep. 2015, False
  • YOSHIMURA Tomokazu, 日本油化学会第54回年会(愛知・名城大学), 単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤の水溶液物性に及ぼすオキシプロピレン鎖長と温度の影響, Sep. 2015, False
  • YOSHIMURA Tomokazu, 第66回コロイドおよび界面化学討論会(鹿児島・鹿児島大学郡元キャンパス), SANSとSAXSの連携利用によるジェミニ型両親媒性デンドリマーミセルの構造解析, Sep. 2015, False
  • YOSHIMURA Tomokazu, 第66回コロイドおよび界面化学討論会(鹿児島・鹿児島大学郡元キャンパス), 直鎖状および星状四級アンモニウム塩系トリメリック型界面活性剤の水溶液物性と会合体特性に及ぼす分子構造の影響, Sep. 2015, False
  • YOSHIMURA Tomokazu, 第66回コロイドおよび界面化学討論会(鹿児島・鹿児島大学郡元キャンパス), 単一鎖長ポリオキシエチレン系非イオン性界面活性剤のポリオキシプロピレン鎖導入によるヘキサゴナル液晶の形成制御, Sep. 2015, False
  • YOSHIMURA Tomokazu, 第64回高分子討論会(宮城・東北大学川内キャンパス), 種々のジェミニ型界面活性剤が水溶液中で形成するミセルのレオロジー挙動, Sep. 2015, False
  • YOSHIMURA Tomokazu, 第33回関西界面科学セミナー-界面科学・分散技術の基礎と最先端研究-, 界面・分散を制御する:界面活性剤による界面吸着とミセル形成, Jul. 2015, 日本化学会コロイドおよび界面化学部会関西支部, 大阪・大阪工業大学大阪センター, False
  • YOSHIMURA Tomokazu, 第64回高分子学会年次大会(北海道・札幌コンベンションセンター), X線小角散乱とレオロジー法による単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤会合体の構造解析, May 2015
  • YOSHIMURA Tomokazu, 第3回物構研サイエンスフェスタ(茨城・エポカルつくば), 高世代ジェミニ型両親媒性デンドリマー溶液の構造解析, Mar. 2015, False
  • YOSHIMURA Tomokazu, 第3回物構研サイエンスフェスタ(茨城・エポカルつくば), SAXSおよびXAFSによる新規非イオン性界面活性剤の会合体と金ナノ粒子の構造解析, Mar. 2015, False
  • YOSHIMURA Tomokazu, 日本化学会第95春季年会(千葉・日本大学理工学部船橋キャンパス/薬学部), 四級アンモニウム塩系ジェミニ型イオン液体の合成と物性, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第95春季年会(千葉・日本大学理工学部船橋キャンパス/薬学部), 単一鎖長ポリオキシエチレン系非イオン性界面活性剤に導入したポリオキシプロピレン鎖の会合体形成に及ぼす影響, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第95春季年会(千葉・日本大学理工学部船橋キャンパス/薬学部), 天然乳化剤として乳酸菌発酵米を用いたエマルションの安定性に及ぼす高級アルコールの影響, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第95春季年会(千葉・日本大学理工学部船橋キャンパス/薬学部), ステアリン酸をモデル汚れとした単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤のQCM法による洗浄力評価, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第95春季年会(千葉・日本大学理工学部船橋キャンパス/薬学部), 四級アンモニウム塩系直鎖状トリメリック型界面活性剤の水溶液物性, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第96春季年会(京都(京田辺)・同志社大学京田辺キャンパス), ビスイソシアニドで連結した直鎖状パラジウム八核錯体ポリマーの合成と性質, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第96春季年会(京都(京田辺)・同志社大学京田辺キャンパス), ナノ構造制御を目指した単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤の会合挙動解明, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第96春季年会(京都(京田辺)・同志社大学京田辺キャンパス), 単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤の気/液界面における吸着ダイナミクス, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第96春季年会(京都(京田辺)・同志社大学京田辺キャンパス), 四級アンモニウム塩系ジェミニ型イオン液体の合成・物性とイオン液体中での単一鎖長非イオン性界面活性剤の界面化学的性質, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第96春季年会(京都(京田辺)・同志社大学京田辺キャンパス), 直鎖状および星状四級アンモニウム塩系トリメリック型界面活性剤の水溶液中における会合体特性, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第96春季年会(京都(京田辺)・同志社大学京田辺キャンパス), 分布を有するポリオキシエチレン鎖を側鎖に用いた低重合度の非イオン性両親媒性オリゴマーの界面化学的性質, Mar. 2015
  • YOSHIMURA Tomokazu, 日本化学会第96春季年会(京都(京田辺)・同志社大学京田辺キャンパス), 2本の分岐アルキル鎖を有する単一鎖長ポリオキシエチレン系非イオン性界面活性剤の合成と物性, Mar. 2015
  • YOSHIMURA Tomokazu, 日本中性子科学会第14回年会(JSNS2014)(北海道・北海道立道民活動センター「かでる2・7」), SANS及びSAXS法による多糖型界面活性剤の構造解析, Dec. 2014, False
  • YOSHIMURA Tomokazu, 日本油化学会オレオマテリアル部会・関西地区講演会~精密分子設計から創出される界面活性剤研究の最新動向~, 新規な構造を有する界面活性剤による新奇な物性発現, Dec. 2014, 日本油化学会・オレオマテリアル部会, 大阪・大阪市立工業研究所, False
  • YOSHIMURA Tomokazu, 第4回CSJ化学フェスタ2014(東京・タワーホール船堀), 環境負荷低減を目指した単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤の開発, Oct. 2014, False
  • YOSHIMURA Tomokazu, 第4回CSJ化学フェスタ2014(東京・タワーホール船堀), 高性能化および高機能化を目指したエチレンアミン誘導体ジェミニ型カチオン界面活性剤の開発, Oct. 2014, False
  • YOSHIMURA Tomokazu, 第46回洗浄に関するシンポジウム(タワーホール船堀), 単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤の水溶液中での物性と洗浄力評価, Oct. 2014
  • YOSHIMURA Tomokazu, 2014年度色材研究発表会(愛知・名古屋市工業研究所), 単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤の界面化学的性質と乳化特性, Oct. 2014, False
  • YOSHIMURA Tomokazu, 2014年度色材研究発表会(愛知・名古屋市工業研究所), エチレンアミン誘導体をスペーサーに用いた四級アンモニウム塩ジェミニ型界面活性剤の溶液内ナノ構造と金ナノ粒子の触媒活性, Oct. 2014, False
  • YOSHIMURA Tomokazu, 第65回コロイドおよび界面化学討論会(東京・東京理科大学神楽坂キャンパス), エチレンアミン誘導体を用いたジェミニ型カチオン界面活性剤の会合体形成に及ぼすスペーサー構造の影響, Sep. 2014
  • YOSHIMURA Tomokazu, 第65回コロイドおよび界面化学討論会(東京・東京理科大学神楽坂キャンパス), 単一鎖長ポリオキシプロピレンポリオキシエチレンアルキルエーテル型非イオン性界面活性剤が形成する会合体のナノ構造, Sep. 2014
  • YOSHIMURA Tomokazu, 日本油化学会第53回年会(北海道・ロイトン札幌), 各種エチレンアミンから誘導したジェミニ型カチオン界面活性剤の水溶液物性と会合体特性, Sep. 2014, False
  • YOSHIMURA Tomokazu, 日本油化学会第53回年会(北海道・ロイトン札幌), 重合度分布をもたない単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤の合成と界面吸着およびミセル形成, Sep. 2014, False
  • YOSHIMURA Tomokazu, 日本化学会第94春季年会(名古屋大学東山キャンパス), 単一鎖長ポリオキシプロピレンポリオキシエチレン系非イオン性界面活性剤の水溶液物性, Mar. 2014, 日本化学会, 名古屋大学東山キャンパス, False
  • YOSHIMURA Tomokazu, 日本化学会第94春季年会(名古屋大学東山キャンパス), 各種エチレンアミンを用いた四級アンモニウム塩ジェミニ型界面活性剤の合成と水溶液物性, Mar. 2014, 日本化学会, 名古屋大学東山キャンパス, False
  • YOSHIMURA Tomokazu, 日本化学会第94春季年会(名古屋大学東山キャンパス), SANS及びSAXS法による多糖型界面活性剤の構造解析, Mar. 2014, 日本化学会, 名古屋大学東山キャンパス, False
  • YOSHIMURA Tomokazu, 日本油化学会第52回年会(東北大学川内北キャンパス), アダマンチル基を有する四級アンモニウム塩カチオン界面活性剤の水溶液物性, Sep. 2013, 日本油化学会, 日本油化学会第47回年会(日本大学駿河台キャンパス), False
  • YOSHIMURA Tomokazu, 日本油化学会第52回年会(東北大学川内北キャンパス), 乳酸菌発酵米を用いた新規天然系乳化剤の開発, Sep. 2013, 日本油化学会, 日本油化学会第47回年会(日本大学駿河台キャンパス), False
  • YOSHIMURA Tomokazu, 日本油化学会第52回年会(東北大学川内北キャンパス), ジェミニ型界面活性剤水溶液へのナフタレン及びパーフルオロナフタレンの可溶化, Sep. 2013, 日本油化学会, 日本油化学会第47回年会(日本大学駿河台キャンパス), False
  • YOSHIMURA Tomokazu, 第64回コロイドおよび界面化学討論会(名古屋工業大学), アダマンチル基を有する四級アンモニウム塩界面活性剤のミセル構造解析, Sep. 2013, False
  • YOSHIMURA Tomokazu, 第64回コロイドおよび界面化学討論会(名古屋工業大学), フッ化炭素系ジェミニ型カチオン界面活性剤の多角形ベシクル形成と金ナノ粒子の触媒活性, Sep. 2013, False
  • YOSHIMURA Tomokazu, 第64回コロイドおよび界面化学討論会(名古屋工業大学), SANS/SAXSによるジェミニ型両親媒性デンドリマー水溶液の構造解析, Sep. 2013, False
  • YOSHIMURA Tomokazu, 第64回コロイドおよび界面化学討論会(名古屋工業大学), 新規天然乳化剤として乳酸菌発酵米とレシチンの混合系を用いたエマルションの開発, Sep. 2013, False
  • YOSHIMURA Tomokazu, 日本油化学会第52回年会・受賞講演, 特異な構造を有する新規界面活性剤の合成と物性に関する研究, Sep. 2013, 日本油化学会, 仙台・東北大学川内北キャンパス, False
  • YOSHIMURA Tomokazu, 色材協会関係コロイド化学セミナー -界面活性剤の入門から最前線の研究まで-, アルキル鎖を有する両親媒性デンドリマーの開発, Aug. 2013, 色材協会, 日本大学理工学部駿河台キャンパス, False
  • YOSHIMURA Tomokazu, 日本化学会第93春季年会(立命館大学びわこ・くさつキャンパス), 乳酸菌発酵米を用いたO/W型エマルションの調製と物性, Mar. 2013, 日本化学会, 立命館大学びわこ・くさつキャンパス, False
  • YOSHIMURA Tomokazu, 日本化学会第93春季年会(立命館大学びわこ・くさつキャンパス), アダマンチル基を有するカチオン界面活性剤の合成と物性, Mar. 2013, 日本化学会, 立命館大学びわこ・くさつキャンパス, False
  • YOSHIMURA Tomokazu, 日本油化学会フレッシュマンサミットOSAKA(近畿大学本部キャンパス), フッ化炭素-炭化水素系ハイブリッドジェミニ型アニオン界面活性剤の水溶液中での会合体特性, Nov. 2012
  • YOSHIMURA Tomokazu, 日本油化学会フレッシュマンサミットOSAKA(近畿大学本部キャンパス), フッ化炭素系ジェミニ型カチオン界面活性剤の会合体特性と金ナノ粒子の合成, Nov. 2012
  • YOSHIMURA Tomokazu, 第44回洗浄に関するシンポジウム, 小角散乱を用いた分子集合体のナノ構造解析, Nov. 2012, 日本油化学会, 奈良女子大学(奈良), False
  • YOSHIMURA Tomokazu; H.Iwase; T.Yoshimura; A.Ebihara; M.Shibayama, World Congress on Oleo Science & 29th ISF Congress -JOCS/AOCS/KOCS/ISF Joint Meeting-, Small-Angle Neutron and X-Ray Scattering Study on Aggregation Properties of Amphiphilic Dendrimer solutions, Oct. 2012, 仙台国際センター(宮城県仙台市), True
  • YOSHIMURA Tomokazu; A.Morishima; H.Iwase; T.Ogawa; H.Kurata; T.Yoshimura, World Congress on Oleo Science & 29th ISF Congress -JOCS/AOCS/KOCS/ISF Joint Meeting-, Synthesis and Solution Properties of Fluorocarbon-Hydrocarbon Hybrid Type Anionic Gemini Surfactants, Oct. 2012, 仙台国際センター(宮城県仙台市), True
  • YOSHIMURA Tomokazu; T.Yoshimura; M.Hayami; K.Matsuoka; H.Iwase, World Congress on Oleo Science & 29th ISF Congress -JOCS/AOCS/KOCS/ISF Joint Meeting-, Adsorption and Aggregation Properties of Partially-Fluorinated Gemini Quaternary Ammonium Chloride Surfactants, Oct. 2012, 仙台国際センター(宮城県仙台市), True
  • YOSHIMURA Tomokazu; T.Kusano; H.Iwase; T.Yoshimura; M.Shibayama, World Congress on Oleo Science & 29th ISF Congress -JOCS/AOCS/KOCS/ISF Joint Meeting-, Structural Analysis of Wormlike Micelles Formed by Trimeric Surfactants, Oct. 2012, 仙台国際センター(宮城県仙台市), True
  • YOSHIMURA Tomokazu, 2012年度色材研究発表会(大阪府立大学中百舌鳥キャンパス), 四級アンモニウム塩化物を有するフッ化炭素系ジェミニ型界面活性剤の界面化学的性質, Sep. 2012
  • YOSHIMURA Tomokazu, 2012年度色材研究発表会(大阪府立大学中百舌鳥キャンパス), フッ化炭素-炭化水素系ハイブリッドジェミニ型アニオン界面活性剤の界面化学的性質, Sep. 2012
  • YOSHIMURA Tomokazu, 第42回被服整理学夏季セミナー, 界面活性剤の基礎科学-構造と物性-, Aug. 2012, 日本家政学会被服整理学部会, 奈良・奈良ロイヤルホテル, False
  • YOSHIMURA Tomokazu; A.Morishima; H.Iwase; T.Ogawa; H.Kurata; T.Yoshimura, International Association of Colloid and Interface Sceintists, Conference IACIS 2012, Adsorption and Aggregation Properties of Fluorocarbon-Hydrocarbon Hybrid type Anionic Gemini Surfactants, Jun. 2012, 仙台国際センター(宮城県仙台市), True
  • YOSHIMURA Tomokazu; T.Kusano; H.Iwase; T.Yoshimura; M.Shibayama, International Association of Colloid and Interface Sceintists, Conference IACIS 2012, Mechanism of Wormlike Micelles Formed by Trimeric Surfactants Solutions, Jun. 2012, 仙台国際センター(宮城県仙台市), True
  • YOSHIMURA Tomokazu, 色材協会関係コロイド化学セミナー, 高性能・高機能性を目指した両親媒性デンドリマーの創製, Jun. 2012, 色材協会, 東京塗料会館(東京都渋谷区恵比寿), False
  • YOSHIMURA Tomokazu, 日本油化学会フレッシュマンサミットOSAKA(近畿大学本部キャンパス), 炭化水素鎖長の異なる非対称ジェミニ型カチオン界面活性剤の溶液物性に及ぼす非対称効果, Nov. 2011
  • YOSHIMURA Tomokazu, 日本油化学会フレッシュマンサミットOSAKA(近畿大学本部キャンパス), カルボン酸基を有するフッ化炭素-炭化水素系ハイブリッドジェミニ型界面活性剤の合成と会合体特性, Nov. 2011
  • YOSHIMURA Tomokazu, 日本油化学会フレッシュマンサミットOSAKA(近畿大学本部キャンパス), X線小角散乱によるジェミニ型両親媒性デンドリマーの会合体構造と金ナノ粒子の合成, Nov. 2011
  • YOSHIMURA Tomokazu, 日本油化学会フレッシュマンサミットOSAKA(近畿大学本部キャンパス), 両親媒性多糖オリゴマーからなるミセルと金属ナノ粒子の\nX線小角散乱を用いた構造解析, Nov. 2011
  • YOSHIMURA Tomokazu; T.Kusano; H.Iwase; T.Yoshimura; M.Shibayama, AOCNS (1st Asia Oceania Conference on Neutron Scattering), Structural and rheological studies of aggregation behavior of trimeric surfactants in aqueous solutions, Nov. 2011, つくばエポカル(つくば市), True
  • YOSHIMURA Tomokazu, 第63回コロイドおよび界面化学討論会(京都大学吉田キャンパス), X線小角散乱による両親媒性多糖オリゴマーのミセル構造解析, Sep. 2011
  • YOSHIMURA Tomokazu, 第63回コロイドおよび界面化学討論会(京都大学吉田キャンパス), 異なる炭化水素鎖長をもつ非対称ジェミニ型界面活性剤の界面吸着と会合体形成, Sep. 2011
  • YOSHIMURA Tomokazu, 第63回コロイドおよび界面化学討論会(京都大学吉田キャンパス), ジェミニ型両親媒性デンドリマーの水溶液中での物性と会合体特性, Sep. 2011
  • YOSHIMURA Tomokazu, 第63回コロイドおよび界面化学討論会(京都大学吉田キャンパス), カルボン酸基を有するフッ化炭素-炭化水素系ハイブリッドジェミニ型界面活性剤の水溶液中における会合挙動, Sep. 2011
  • YOSHIMURA Tomokazu, 第63回コロイドおよび界面化学討論会(京都大学吉田キャンパス), 中性子・X線小角散乱法による両親媒性デンドリマー会合体の構造解析, Sep. 2011
  • YOSHIMURA Tomokazu, 第63回コロイドおよび界面化学討論会(京都大学吉田キャンパス), Tadpole型両親媒性デンドリマーで保護した金・白金ナノ粒子の合成と活性酸素消去能, Sep. 2011
  • YOSHIMURA Tomokazu, 第63回コロイドおよび界面化学討論会(京都大学吉田キャンパス), 三鎖型界面活性剤会合体の濃度変化による構造転移, Sep. 2011
  • YOSHIMURA Tomokazu, 日本化学会第91春季年会(神奈川大学横浜キャンパス), 中性子小角散乱によるTadpole型両親媒性デンドリマー会合体のナノ構造解析, Mar. 2011
  • YOSHIMURA Tomokazu, 日本化学会第91春季年会(神奈川大学横浜キャンパス), Tadpole型両親媒性デンドリマー保護金および白金ナノ粒子の調製と触媒活性, Mar. 2011
  • YOSHIMURA Tomokazu, 日本化学会第91春季年会(神奈川大学横浜キャンパス), 両親媒性多糖オリゴマーの界面物性と水溶液中での会合体特性, Mar. 2011
  • YOSHIMURA Tomokazu, 2010年度色材研究発表会(タワーホール船堀), Tadpole型両親媒性デンドリマーの溶液内ナノ構造と金ナノ粒子合成, Nov. 2010
  • YOSHIMURA Tomokazu, 2010年度色材研究発表会(タワーホール船堀), デンドロン骨格を親水部とするジェミニ型両親媒性デン\nドリマーの界面化学的性質, Nov. 2010
  • YOSHIMURA Tomokazu, 2010年度色材研究発表会(タワーホール船堀), 両親媒性多糖オリゴマー保護金属ナノ粒子の調製と触媒活性, Nov. 2010
  • YOSHIMURA Tomokazu, 界面コロイドラーニング(関西) - 第26回現代コロイド・界面化学基礎講座, 基礎からの界面活性剤:構造・物性・機能, Nov. 2010, 日本化学会コロイドおよび界面化学部会, False
  • YOSHIMURA Tomokazu, 日本油化学会第49回年会(北海道大学函館キャンパス), 親水性デンドロンを有するジェミニ型両親媒性デンドリマーの合成と物性, Sep. 2010
  • YOSHIMURA Tomokazu, 日本油化学会第49回年会(北海道大学函館キャンパス), Tadpole型両親媒性デンドリマーが水溶液中で形成する会合体のナノ構造, Sep. 2010
  • YOSHIMURA Tomokazu, 日本油化学会第49回年会(北海道大学函館キャンパス), 末端に長鎖アルキル基を有する両親媒性多糖オリゴマーの界面化学的性質, Sep. 2010
  • YOSHIMURA Tomokazu, 日本油化学会第49回年会(北海道大学函館キャンパス), 部分フッ素化した界面活性剤のミセル形成に及ぼす2つの四級アンモニウム基の効果, Sep. 2010
  • YOSHIMURA Tomokazu; T.Yoshimura; A.Okuda; H.Iwase; Y.Oba; M.Ohnuma; T.Ogawa; S.Isoda, International Conference on Nanoscopic Colloid and Surface Science (NCSS2010), Aggregation Properties of Amphiphilic Dendrimer in Aqueous Solution: A Combined Small-Angle Scattering (SANS and SAXS) Study, Sep. 2010, 幕張メッセ国際会議場
  • YOSHIMURA Tomokazu; H.Iwase; T.Yoshimura; A.Ebihara; Y.Oba; M.Ohnuma; M.Shibayama, International Conference on Nanoscopic Colloid and Surface Science (NCSS2010), Nano-Structure of Aggregates Formed by Hydrocarbon-Fluorocarbon Hybrid type Gemini Surfactants in Aqueous Solution, Sep. 2010, 幕張メッセ国際会議場
  • YOSHIMURA Tomokazu, 第66回SCCJ研究討論会, 環境適合型次世代界面活性剤の開発, Jun. 2010, 日本化粧品技術者会, 大阪国際交流センター(大阪), False
  • YOSHIMURA Tomokazu, 日本化学会第90春季年会(近畿大学本部キャンパス), 長鎖アルキル基を有する両親媒性多糖オリゴマーの合成と物性, Mar. 2010
  • YOSHIMURA Tomokazu, 日本化学会第90春季年会(近畿大学本部キャンパス), フッ化炭素-炭化水素系ハイブリッドジェミニ型界面活性剤の会合体特性, Mar. 2010
  • YOSHIMURA Tomokazu, 日本化学会第90春季年会(近畿大学本部キャンパス), 長鎖アルキル基を有するTadpole型両親媒性デンドリマーの会合挙動, Mar. 2010
  • YOSHIMURA Tomokazu, 日本化学会第90春季年会(近畿大学本部キャンパス), フッ化炭素系ジェミニ型陽イオン界面活性剤の溶液物性に及ぼす対イオンの効果, Mar. 2010
  • YOSHIMURA Tomokazu, 2009年度色材研究発表会(エル・おおさか), 1または2本のフッ化炭素鎖を有するジェミニ型界面活性剤の界面化学的性質, Oct. 2009
  • YOSHIMURA Tomokazu, 日本油化学会第48回年会(名古屋工業大学), カルボン酸基を有する部分的にフッ素化したアニオン性ジェミニ型界面活性剤の界面物性と会合体の形態変化, Sep. 2009
  • YOSHIMURA Tomokazu, 日本油化学会第48回年会(名古屋工業大学), フッ化炭素系ジェミニ型陽イオン界面活性剤の界面化学的性質, Sep. 2009
  • YOSHIMURA Tomokazu, 日本油化学会第48回年会(名古屋工業大学), フッ化炭素-炭化水素系ハイブリッドジェミニ型界面活性剤の界面物性, Sep. 2009
  • YOSHIMURA Tomokazu, 日本油化学会第48回年会(名古屋工業大学), 超長鎖界面活性剤の界面物性と会合挙動に及ぼす親水基構造の影響, Sep. 2009
  • YOSHIMURA Tomokazu, 日本油化学会第48回年会(名古屋工業大学), 長鎖アルキル基を有するTadpole型両親媒性デンドリマーの合成と物性, Sep. 2009
  • YOSHIMURA Tomokazu, 第62回コロイドおよび界面化学討論会(岡山理科大学), カルボン酸リチウム平板結晶表面アルキル鎖の特性, Sep. 2009
  • YOSHIMURA Tomokazu, 第62回コロイドおよび界面化学討論会(岡山理科大学), フッ化炭素系ジェミニ型界面活性剤の溶液物性に及ぼす連結基の影響, Sep. 2009
  • YOSHIMURA Tomokazu, 第62回コロイドおよび界面化学討論会(岡山理科大学), フッ化炭素-炭化水素系ハイブリッドジェミニ型界面活性剤の水溶液物性, Sep. 2009
  • YOSHIMURA Tomokazu, 第62回コロイドおよび界面化学討論会(岡山理科大学), アルキル鎖をコアに導入した両親媒性デンドリマーの水溶液物性, Sep. 2009
  • YOSHIMURA Tomokazu, 日本油化学会第48回年会・オレオマテリアルシンポジウム, 異種の疎水鎖または親水基を有するジェミニ型界面活性剤の合成と物性, Sep. 2009, 日本油化学会オレオマテリアル部会, 名古屋工業大学(名古屋), False
  • YOSHIMURA Tomokazu, 2009年日本油化学会若手の会サマースクール, 多鎖多親水基型の次世代界面活性剤-物性と会合挙動-, Jul. 2009, 日本油化学会若手の会, あいち健康プラザ(愛知県知多郡), False
  • YOSHIMURA Tomokazu, 材料技術研究協会 新技術公開セミナー ―第一線で活躍している若手研究者による界面活性剤―, 特異な構造を有する新規界面活性剤の合成とその溶液物性, Feb. 2009, 材料技術研究協会, 東京都新宿区(東京理科大学森戸記念館), False
  • YOSHIMURA Tomokazu; Keisuke Matsuoka; Tomokazu Yoshimura; Chikako Honda; Kazutoyo Endo, 22nd Conference of the European Colloid and Interface Society(Poland), Nanocage Aggregates composed of Bilayer Sheets, Sep. 2008
  • YOSHIMURA Tomokazu, 第61回コロイドおよび界面化学討論会(九州大学 六本松キャンパス), 二分子膜で構成されたナノケージ会合体, Sep. 2008
  • YOSHIMURA Tomokazu, 第61回コロイドおよび界面化学討論会(九州大学 六本松キャンパス), カルボン酸リチウムの物理化学特性, Sep. 2008
  • YOSHIMURA Tomokazu, 第61回コロイドおよび界面化学討論会(九州大学 六本松キャンパス), フッ化炭素-炭化水素ハイブリッドジェミニ型陽イオン界面活性剤の溶液物性, Sep. 2008
  • YOSHIMURA Tomokazu, 第61回コロイドおよび界面化学討論会(九州大学 六本松キャンパス), 超長鎖炭化水素を有する2または3親水基型陽イオン界面活性剤の会合体特性, Sep. 2008
  • YOSHIMURA Tomokazu, 第8回油脂優秀論文賞受賞講演会[研究助成部門](日本大学駿河台キャンパス), 次世代型界面活性剤の開発とその基礎物性及び自己組織化に関する研究, Sep. 2008
  • YOSHIMURA Tomokazu, 日本油化学会第47回年会(日本大学駿河台キャンパス), 2親水基含有超長鎖界面活性剤のミセル形成に及ぼす疎水鎖と親水基の影響, Sep. 2008
  • YOSHIMURA Tomokazu, 日本油化学会第47回年会(日本大学駿河台キャンパス), 異種の親水基を有する超長鎖界面活性剤の合成と物性, Sep. 2008
  • YOSHIMURA Tomokazu, 日本油化学会第47回年会(日本大学駿河台キャンパス), フッ化炭素-炭化水素ハイブリッドジェミニ型陽イオン界面活性剤の合成と物性, Sep. 2008
  • YOSHIMURA Tomokazu, 日本化学会第88春季年会(立教大学池袋キャンパス), 超長鎖アルキルトリアンモニウム塩型界面活性剤の合成と物性, Mar. 2008
  • YOSHIMURA Tomokazu, 日本化学会第88春季年会(立教大学池袋キャンパス), 部分フッ素化した多鎖多親水基型カチオン界面活性剤の合成と物性, Mar. 2008
  • YOSHIMURA Tomokazu, 日本化学会第88春季年会(立教大学池袋キャンパス), 1または2本の炭化水素鎖をもつ両親媒性デンドリティックポリマーの合成と物性, Mar. 2008
  • YOSHIMURA Tomokazu, 第46回日本油化学会年会(京都工芸繊維大学松ヶ崎キャンパス), 長鎖アルキル基を有する四級アンモニウム塩型界面活性剤の合成と物性, Sep. 2007
  • YOSHIMURA Tomokazu; T.Yoshimura, 80th JSCM Anniversary Conference "New Fields in Colour and Coatings", Adsorption and Micellisation Behaviour of Sugar-Based Gemini Surfactants, Sep. 2007, 東京理科大学九段校舎
  • YOSHIMURA Tomokazu, 第60回コロイドおよび界面化学討論会/第2回日豪シンポジウム(信州大学理学部・松本), 部分フッ素化したカチオン性ジェミニ型界面活性剤の会合体形成, Sep. 2007
  • YOSHIMURA Tomokazu, 第60回コロイドおよび界面化学討論会/第2回日豪シンポジウム(信州大学理学部・松本), 長鎖炭化水素を有する四級アンモニウム塩型界面活性剤の会合挙動, Sep. 2007
  • YOSHIMURA Tomokazu, 日本化学会第87春季年会(関西大学千里山キャンパス), 長鎖多親水基を有する四級アンモニウム塩型界面活性剤の合成と物性, Mar. 2007
  • YOSHIMURA Tomokazu, 第45回日本油化学会年会(東京理科大学野田キャンパス), トリス(2-アミノエチル)アミン骨格の3鎖型アンモニウム塩界面活性剤の合成と物性, Sep. 2006
  • YOSHIMURA Tomokazu, 第59回コロイドおよび界面化学討論会(北海道大学高等教育機能開発総合センター), 特殊な構造を持つオリゴマー型界面活性剤の会合体特性, Sep. 2006
  • YOSHIMURA Tomokazu, 第23回九州コロイドコロキウム, 高性能化を目指したジェミニ型界面活性剤の分子設計-基礎物性と会合体形成-, Aug. 2005, 日本化学会コロイドおよび界面化学部会九州支部, 熊本市(熊本テルサ), False
  • YOSHIMURA Tomokazu, トクヤマデンタル特別講演, ジェミニ型界面活性剤の合成と基礎物性, Jan. 2005, トクヤマデンタルつくば研, つくば市(トクヤマデンタルつくば研), False

Works

  • X線小角散乱を用いた両親媒性化合物が形成する会合体の会合体特性に関する研究(企業), Apr. 2016
  • 界面活性剤の物性に関する研究(企業), Jul. 2015
  • 新規非イオン性界面活性剤の開発(企業), Apr. 2015
  • 新規界面活性剤の開発(企業), Apr. 2015
  • 新規非イオン性界面活性剤の物性に関する研究(企業), Apr. 2015
  • アダマンタンを用いた両親媒性化合物の開発と性能評価(企業), Apr. 2011, Mar. 2015
  • 界面活性剤を用いた新規洗浄液の開発(企業), 2013, 2015
  • 糖含有新規ジェミニ型界面活性剤の開発(企業), Apr. 2014
  • 界面活性剤ミセルの可溶化に関する研究, Apr. 2013
  • 界面活性剤水溶液の物性と会合体形成に関する研究, Sep. 2006, Mar. 2013
  • ジェミニ型陽イオン界面活性剤の開発(企業), 2013
  • 乳酸菌発酵米を用いた乳化のメカニズム(企業), Apr. 2012
  • X線小角散乱SAXSを用いた分子集合体のナノ構造解析, 2010
  • 界面活性剤が形成する会合体の極低温透過型電子顕微鏡によるナノ構造解析, Oct. 2009
  • カルボン酸金属塩の物性および応用に関する研究, 2001, 2008
  • 中性子小角散乱を用いた界面活性剤ミセルの構造解析に関する研究, 2003, 2005
  • 透過型電子顕微鏡を用いた界面活性剤ミセルの構造解析に関する研究, 2004, 2004

Awards

  • 20th J. Oleo Sci. Editor's Award, 公益社団法人日本油化学会, 吉村倫一, May 2017
  • 平成24年度日本油化学会進歩賞, 公益社団法人日本油化学会, 吉村倫一, Apr. 2013
  • 平成18年度色材協会賞(論文賞), 社団法人色材協会, Sep. 2006
  • 平成15年度色材協会賞(論文賞), 社団法人色材協会, 2003

Industrial Property Rights

  • Patent right, アルキル糖ーアミノ酸の結合体, YOSHIMURA Tomokazu, 羽田容介、澤木茂、澤木茂豊、吉村倫一, 特願20180038814, 05 Mar. 2018, 201809, 20 Sep. 2018
  • Patent right, カチオン性ジェミニ型界面活性剤, YOSHIMURA Tomokazu, 瀬底祐介、吉村倫一, 特願20160171703, 02 Sep. 2016, 201803, 08 Mar. 2018
  • Patent right, カチオン性ジェミニ型界面活性剤, YOSHIMURA Tomokazu, 瀬底祐介、吉村倫一, 特願20160171702, 02 Sep. 2016, 201803, 08 Mar. 2018
  • Patent right, ジェミニ型界面活性剤, YOSHIMURA Tomokazu, 徳本勝美、吉村倫一, 特願20160154902, 05 Aug. 2016, 201703, 16 Mar. 2017
  • Patent right, ジェミニ型界面活性剤, YOSHIMURA Tomokazu, 若林保武,吉村倫一, 特願2014-047268, 11 Mar. 2014, 201509, 28 Sep. 2015
  • Patent right, 貴金属コロイド内包ラメラ構造体、その分散液及びこれを含む化粧品並びにその分散液の製造方法, YOSHIMURA Tomokazu, 高橋康之 外6名, 特許出願2006-80734, 23 Mar. 2006, 200710, 04 Oct. 2007
  • Patent right, 低沸点有機化合物の固形化方法,その取り扱い方法及び固形状集合体からの低沸点有機化合物の再生方法, YOSHIMURA Tomokazu, 坂口豁,吉村倫一,他1名, 2001, 2001

Research Projects

  • 01 Apr. 2021, 31 Mar. 2022, Principal investigator
  • 2008, 金属ナノ粒子の調製と物性に関する研究, 0, 0, 0, Competitive research funding
  • 2005, 環境適合型界面活性剤を用いたエマルションの物性に関する研究, 0, 0, 0, Competitive research funding
  • 2005, Study on Liquid/Liquid Interface and Emulsion, 0, 0, 0, Competitive research funding
  • 2003, X線・中性子小角散乱、低温透過型電子顕微鏡を用いた分子集合体のナノ構造解析に関する研究, 0, 0, 0, Competitive research funding, rm:published_papers
  • 2003, Study on Self-Organization of Surfactant with Special Structure, 0, 0, 0, Competitive research funding
  • 2001, 界面活性剤の水溶液物性に関する研究, 0, 0, 0, Competitive research funding
  • 2001, Study on Solution Properties of Surfactant, 0, 0, 0, Competitive research funding
  • 1998, 高性能・高機能化を目指した新規界面活性剤および両親媒性高分子の開発, 0, 0, 0, Competitive research funding
  • 1998, Design and Synthesis of Novel Surfactants and Polymers with High Functions, 0, 0, 0, Competitive research funding
  • 金属ナノ粒子の開発, 0, 0, 0, Competitive research funding
  • エマルションの調製と物性評価, 0, 0, 0, Competitive research funding
  • 小角散乱を用いた分子集合体のナノ構造解析, 0, 0, 0, Competitive research funding
  • 次世代型新規界面活性剤の開発と性能評価(ジェミニ型、オリゴマー型、両親媒性高分子型、糖鎖型、フッ化炭素系など), 0, 0, 0, Competitive research funding
  • 01 Apr. 2021, 31 Mar. 2022, Principal investigator
  • 01 Jun. 2021, 31 May 2022, Principal investigator
  • 01 Nov. 2021, 31 May 2022, Principal investigator
  • 01 Apr. 2021, 31 Mar. 2022, Principal investigator
  • 01 Apr. 2021, 31 Mar. 2022, Principal investigator
  • 01 Apr. 2021, 31 Mar. 2022, Principal investigator
  • 01 Apr. 2021, 31 Mar. 2022, Principal investigator
  • Grant-in-Aid for Scientific Research (C), 01 Apr. 2017, 31 Mar. 2020, 17K05948, Development of environmentally friendly molecular assembly ionic liquids, Yoshimura Tomokazu, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 4940000, 3800000, 1140000, Ionic liquids are composed entirely of cations and anions, and are liquid under ambient conditions. Their physicochemical properties can be readily tuned for specific applications by utilizing different combinations of the anions and cations. In this study, the surface adsorption and bulk properties of homogeneous EO-type nonionic surfactants in ionic liquids were investigated. Further, we observed the effects of alkyl chain length, the number of alkyl chains, the structure of counterions of the ionic liquids, as well as alkyl chain length of the surfactants., kaken
  • Grant-in-Aid for Scientific Research (C), 01 Apr. 2014, 31 Mar. 2017, 26410194, Development of Novel Nonionic Surfactants with Reduction in Environmental Loading Instead of Ethylene Oxide, Yoshimura Tomokazu, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 4290000, 3300000, 990000, Homogeneous polyoxypropylene (PO)-polyoxyethylene (EO) alkyl ether type nonionic surfactants comprising alkyl, EO, and PO chains with identical chain length distributions (CnEOxPOy; alkyl chain length n = 10, 12, 14, or 16; EO chain length x = 4, 6, or 8; and PO chain length y = 1, 2, or 3) were synthesized from homogeneous polyoxyethylene alkyl ether bromide and monosodium polyoxypropylene by Williamson ether synthesis. The adsorption and aggregation properties of these surfactants were characterized (cloud point, surface tension, dynamic light scattering, small-angle X-ray scattering, polarization microscopy, and cryogenic transmission electron microscopy) and compared to those of conventional homogeneous EO alkyl ether type nonionic surfactants (CnEOx)., kaken
  • Grant-in-Aid for Young Scientists (B), 2011, 2012, 23750163, Development of Nano-ColloidProtected by Multi-Chained type Amphiphilic Dendrimers with High Functional and Antioxidant Activity, YOSHIMURA Tomokazu, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 2730000, 2100000, 630000, The purpose of this study is to develop gold or platinum nano-colloid particles with high antioxidant activity and functionality by using monomeric and gemini-type amphiphilic dendrimers with one or two alkyl chains and two dendron skeletons and their sugar-modified amphiphilic dendrimers as protected agent. We investigated their solution properties and aggregation behavior, and discussed catalytic activities for their gold or platinum nanoparticles., kaken
  • Grant-in-Aid for Young Scientists (B), 2008, 2009, 20750109, Development of Biomaterials using Multi-Sugar Modified Dendritic Polymers with Fluorocarbon Chain, YOSHIMURA Tomokazu, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 1430000, 1100000, 330000, The purpose of this study is to develop biomaterials with high performances by using dendritic polymer which is molecular nanoarchitectures of well-defined size and number of terminal groups. We designed and synthesized amphiphilic dendritic polymers with one fluorocarbon or one hydrocarbon chain and their sugar-modified polymers due to be self-assembled in water. It was proved that their physicochemical properties were influenced by the generation number of dendritic polymers and pH in solution., kaken

Ⅲ.社会連携活動実績

1.公的団体の委員等(審議会、国家試験委員、他大学評価委員,科研費審査委員等)

  • Society
  • Society
  • Society
  • Society
  • Society
  • Society
  • Society
  • Society
  • Society
  • Society
  • Apr. 2022, Mar. 2024, Society
  • Apr. 2021, Mar. 2023, Society
  • Apr. 2023, Mar. 2025, Society
  • Apr. 2023, Mar. 2024, Society
  • Apr. 2021, Mar. 2023, Society


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