Monolayers of alkylammonium alkanesulfonates.
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概要
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The surface pressure-area (π-<I>A</I>) curves for monolayers of cation-anion double long-chain salts, alkylammonium alkanesulfonates, were determined at the air-water interface by the Langmuir method. When the total chain length of cation and anion was constant, the transition pressure from the expanded to the condensed state in the monolayer was lowered as the chain length of cation elongated, and the lowest pressure at the transition point was observed in the case of the equal chain length of cation and anion. The lower the pressure at the transition point, the larger the value of the mean area per molecule at that point. The apparent molar entropy, enthalpy, and energy of transition from the expanded to the condensed phase were calculated from the temperature dependence of the transition pressure on the π-<I>A</I> curve. All the values calculated were negative. The magnitude in the changes of the apparent molar quantities was greatest when both a cationic and an anionic chain had the same length. These results were interpreted in terms of the orientation of double long-chain salt in the condensed state of monolayer. The increase in the chain length of cation and anion tends to increase the values of apparent molar quantity changes. The contributions of long-chain anion and cation to the phase transition of monolayer are not equivalent; the condensing effect of long-chain cation is larger than that of long-chain anion.
- 公益社団法人 日本化学会の論文
著者
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NAKAMURA MAKOTO
College of General Education, Kyushu University
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Matuura Ryohei
Department of Chemistry Faculty of Science Kyushu University
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Kaneshina Shoji
College of General Education, Kyushu University-01
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Shibata Osamu
College of General Education, Kyushu University-01
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