Effects of Hydrophobic Chain Length on Temperature Dependence of Monolayer Behavior of Ester-type Tartaric Geminis
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概要
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Ester-type tartaric gemini amphiphiles bearing two carboxyl groups and two hydrophobic alkanoyl groups were prepared from L-tartaric acid, and the pressure-area (π-A) isotherms for a series of symmetric tartaric gemini amphiphiles were measured by the conventional film-balance technique. The effects of the length of the hydrophobic alkanoyl chains and of the subphase temperature (Tsub) on the π-A isotherms for these compounds were examined. As the length of the hydrophobic alkyl chain increased, a more tightly packed monolayer was formed at the air-water interface. The melting temperature (Tm) of the monolayer on the water surface was evaluated from the subphase temperature (Tsub) dependence of the monolayer static elasticity εs, based on a π-A isotherm. A clear relationship between Tm and hydrophobic carbon number (n) was observed for 2D monolayers of tartaric geminis on water surfaces, as well as for fatty acids and/or 3D solids.
著者
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SAITO Isao
Department of Orthodontics, School of Dentistry, Niigata University
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Kawase Tokuzo
Department of Chemistry and Materials Technology, Kyoto Institute of Technology
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Oida Tatsuo
Department of Chemistry and Materials Technology, Kyoto Institute of Technology
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Kawase Tokuzo
Department Of Chemistry And Materials Technology Kyoto Institute Of Technology
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Oida Tatsuo
Department Of Chemistry And Materials Technology Kyoto Institute Of Technology
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Saito Isao
Department Of Cardiovascular Disease Research Eisai Tsukuba Research Laboratories
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Saito Isao
Department of Chemistry and Materials Technology, Kyoto Institute of Technology
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