九州大学 研究者情報
論文一覧
今井 洋輔(いまい ようすけ) データ更新日:2023.10.02

助教 /  基幹教育院 自然科学実験系部門


原著論文
1. Satoshi Matsubara, Teruko Funatsu, Hajime Tanida, Makoto Aratono, Yosuke Imai, Hiroki Matsubara, Effect of Surface Freezing of a Cationic Surfactant and n-Alkane Mixed Adsorbed Film on Counterion Distribution and Surface Dilational Viscoelasticity Studied by Total Reflection XAFS and Surface Quasi-Elastic Light Scattering, Langmuir, https://doi.org/10.1021/acs.langmuir.3c00591, 39, 22, 7759-7765, 2023.05.
2. A. Yamakawa, H. Hayase, S. Hiraki, Y. Imai, T. Ina, K. Nitta, H. Tanida, T. Uruga, T. Takiue, Condensed Film Formation and Molecular Packing in Cationic Surfactant – Cholesterol and Zwitterionic Surfactant – Cholesterol Systems at the Hexane/Water Interface, 10.1021/acs.jpcb.0c07874, 124, 9275-9282, 2020.09.
3. Haruna Hayase, Yosuke Imai, Toshiaki Ina, Kiyofumi Nitta, Hajime Tanida, Tomoya Uruga, Takanori Takiue, Solid Film Formation at the Tetradecane/Aqueous Hexadecyltrimethylammonium Bromide Solution Interface Studied by Interfacial Tensiometry and X-ray Reflectometry, The Journal of Physical Chemistry B , 123, 25, 5377-5383, 2019.06.
4. Y. Imai, Y. Tokiwa, S. Ueno, H. Tanida, I. Watanabe, H. Matsubara, T. Takiue, M. Aratono, Effect of the Headgroup Structure on Counterion Binding in Adsorbed Surfactant Films Investigated by Total Reflection X-ray Absorption Fine Structure Spectroscopy, Bulletin of the Chemical Society of Japan, doi/10.1246/bcsj.20180167, 91, 1487-1494, 2018.07.
5. S. Ueno, Y. Takajo, S. Ikeda, R. Takemoto, Y. Imai, T. Takiue, H. Matsubara, M. Aratono, Surface dilational viscoelasticity of aqueous surfactant solutions by surface quasi-elastic light scattering, Colloid and Polymer Science, https://doi.org/10.1007/s00396-018-4297-8, 296, 781-798, 2018.03.
6. M. Tsuura, A. Shuto, S. Hiraki, Y. Imai, H. Sakamoto, H. Matsubara, M. Aratono, H. Tanida, K. Nitta, Y. Uruga, T. Takiue, Surface freezing and molecular miscibility of binary fluoroalkanol-alkanol liquid mixture, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2018.04.
7. Kenta Mitani, Yosuke Imai, Toshiaki Ina, Kiyofumi Nitta, Hajime Tanida, Tomoya Uruga, Hiroki Matsubara, Makoto Aratono, Takanori Takiue, Effect of Hydrophobic Chain Structure on Phase Transition and Domain Formation of Hybrid Alcohol Films Adsorbed at the Hexane/Water Interface, The Journal of Physical Chemistry B, 119, 12436-12445, 2015.08, The phase transition and domain formation of the adsorbed film of two kinds of hybrid alcohols (CF3(CF2)m‑1(CH2)nOH, FmHnOH), 2-perfluorooctylethanol (F8H2OH) and 2-perfluorohexylhexanol (F6H6OH), as a mixture at the hexane/water interface was investigated by interfacial tensiometry and X-ray reflection. The interfacial tension γ versus total molality m curve of pure F8H2OH has a break point at high concentration, and thus, the mean area per molecule A changes discontinuously at high interfacial pressure π, corresponding to the phase transition between expanded and condensed films. The Fresnel divided reflectivity R/RF versus Qz plots in the expanded state was well-fitted by the domain model for incoherent interference to determine the interfacial coverage, which is the fraction of the interface covered by the condensed phase. This indicates that the expanded film is heterogeneous and consists of a condensed F8H2OH domain, the size of which is larger than the X-ray coherence length (∼5 μm). In the mixed system, the discontinuous change in A at the phase transition point becomes small with increasing the bulk composition of F6H6OH X2 in the mixture, and eventually the A value changes continuously; i.e, the phase transition becomes obscure in X2 ≥ 0.6. This behavior was linked to an increase in interfacial coverage with X2. Furthermore, the R/RF versus Qz plot was fitted by the domain model for coherent interference, suggesting that the size of the domain is smaller than 5 μm. These results are probably due to the reduction of domain line tension by preferential adsorption of F6H6OH at the F8H2OH domain boundary..
8. Ravneet Kaur, Sakshi Gupta, Surinder K. Mehta, Yosuke Imai, Takanori Takiue, Hiroki Matsubara, Makoto Aratono, Probing the self-aggregation behavior and counter ion distribution of a copper surfactant complex, New Journal of Chemistry, 38, 3925-3932, 2014.08.
9. Huihui Li, Yosuke Imai, Takanori Takiue, Hiroki Matsubara, Makoto Aratono, Thermodynamic study on the interaction of imidazolium salts and POE-type nonionic surfactant in the adsorbed film, Colloid and Polymer Science, 292, 1209-1215, 2014.05.
10. Hiroki Takumi, Yosuke Imai, Narumi Toh, Hiroki Matsubara, Takanori Takiue, Makoto Aratono, Miscibility of imidazolium and pyridinium ionic liquids including BF4- at the air/water interface, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 441, 59-65, 2014.01.

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