Partial molal volumes of surfactants in methanol-water mixtures.
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概要
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The partial molal volumes of surfactants in the micellar state (\bar<I>V</I><SUB>m</SUB>) and in the singly dispersed state (\bar<I>V</I><SUB>s</SUB>) have been determined at 25 °C in methanol-water mixtures up to the composition of 25 mol% methanol. The \bar<I>V</I><SUB>m</SUB> of sodium dodecyl sulfate (SDS) increases gradually with the addition of methanol across the plateau region (3–15 mol% methanol). On the other hand, the \bar<I>V</I><SUB>s</SUB> values of SDS and its homologous salts containing the alkyl chain of carbon numbers from 6 to 10 decrease initially with the addition of methanol and then increase up to 25 mol% methanol <I>via</I> the minimum at 3 mol% methanol. The value of \bar<I>V</I><SUB>m</SUB>–\bar<I>V</I><SUB>s</SUB> reaches its maximum at 3 mol% methanol and then approaches zero at about 30 mol% methanol. The latter behavior is an indication of the lack of any micelle formation. In order to elucidate the solute-solvent interactions, the split of \bar<I>V</I><SUB>s</SUB> into the contributions of the ionic and the hydrophobic part was attempted. Consequently, the variation in \bar<I>V</I><SUB>s</SUB> with the solvent composition can primarily be attributed to the behavior of the hydrophobic group in solutions. On the basis of these results, the interactions between the hydrophobic part of the solute and the binary solvent were discussed.
- 公益社団法人 日本化学会の論文
著者
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Sugihara Gohsuke
Department of Chemistry, Faculty of Science, Fukuoka University
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Sugihara Gohsuke
Department Of Chem.istry Faculty Of Science Fukuoka University
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Tanaka Mitsuru
Department Of Cardiology Miyazaki Medical Association Hospital
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Manabe Masahiro
Department of Applied Chemistry and Biotechnology, Niihama National College of Technology
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Kaneshina Shoji
College of General Education, Kyushu University-01
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Kaneshina Shoji
College of General Education, Kyushu University
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Tanaka Mitsuru
Department of Applied Chemistry, Faculty of Engineering, Tokushima University
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