Biionic potential across liquid membranes with some anionic surfactants.
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概要
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The biionic membrane potential was measured with the system in which a solution of calcium chloride was separated by a liquid membrane from a solution of another metal chloride. Four kinds of liquid membranes were prepared by dissolving calcium hexadecyl sulfate, stearate, cholate or deoxycholate in aqueous 1-octanol. All of the membranes studied were nearly permselective to cation. The membrane potential was analysed according to the Goldman-type equation based on the irreversible thermodynamics. The slope of a linear portion of the biionic potential <I>vs.</I> logarithmic activity curve showed fairly good agreement with the theoretical slope, <I>i.e.</I>, 2.303×2<I>RT</I>⁄(<I>Z</I><SUB>Ca</SUB>+<I>Z</I><SUB>M</SUB>)<I>F</I> per a ten-fold increase in activity, where <I>Z</I><SUB>Ca</SUB> and <I>Z</I><SUB>M</SUB> were the valencies of calcium ion and another metal ion M existing across a membrane, respectively. The selective permeation coefficients of various metal ions were estimated for each membrane. The surprisingly small differences in the selective permeation coefficient between uni- and bi-valent cations were observed for the liquid membranes with calcium stearate, cholate or deoxycholate, while the about ten-fold increase in the coefficient per valency was observed for the liquid membrane with calcium hexadecyl sulfate. These results were discussed according to the theory previously presented.
- 公益社団法人 日本化学会の論文
著者
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Kimizuka Hideo
Department of Chemistry Faculty of Science Kyushu University
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Nomura Kazuo
Laboratory of Chemistry, College of General Education, Kyushu University 01
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Matsubara Akira
Laboratory of Chemistry, College of General Education, Kyushu University 01
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