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Adsorption of Dodecylpyridinium Chloride on Aqueous Surfaces of Sodium Chloride Solutions

Fujio, Katsuhiko; Takeuchi, Kumiko; Suzuki, Maki, 2012.03.30. -- (Proceedings of the School of Science of Tokai University. Vol. 47). w. <TC10000004>
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タイトル Adsorption of Dodecylpyridinium Chloride on Aqueous Surfaces of Sodium Chloride Solutions
作成者 Fujio, Katsuhiko
作成者 Takeuchi, Kumiko
作成者 Suzuki, Maki
公開者 Tokai University. School of Science
公開者 東海大学理学部
公開者 東海大学出版会
掲載巻号 Proceedings of the School of Science of Tokai University. Vol. 47 <TB00000006>
ISSN 09195025
雑誌名 Proceedings of the School of Science of Tokai University
巻次等 47
開始終了ページ 35-47
発行日 2012.03.30
内容記述 Surface tension of aqueous NaCl solutions of dodecylpyridinium chloride (DPC) has been measured by the drop weight method at different NaCl concentrations from 0 to 1.000 mol dm-3 at 25℃. Applying the Gibbs adsorption isotherm to the surface tension data at DPC concentrations below the critical micelle concentration (CMC), surface excess densities of dodecylpyridinium ion (DP+), Cl- and Na+ have been obtained as functions of DPC concentration at different NaCl concentrations. Surface excess densities of DP+ and Cl- increase with increasing DPC concentration, and approach the saturated values at the CMC. On the other hand, the surface excess density of Na+ is nearly zero or slightly negative with respect to DPC concentration. Unlike common ionic surfactants, the molecular area of DPC on aqueous surface increases with increasing NaCl concentration up to 0.010 mol dm-3, and then decreases to almost constant value. The Corrin-Harkins plot is linear in NaCl concentration range studied.
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