Physicochemical properties of eicosane-1,20-bis(trimethylammonium) dibromide in aqueous solution.
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概要
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The physicochemical properties of a cationic α,ω-type(bolaform) surfactant, eicosane-1,20-bis(trimethylammonium) dibromide (C<SUB>20</SUB>Me<SUB>6</SUB>), were investigated by means of surface tension, electrical conductivity, density, dye solubilization, fluorescence, and light scattering. The results obtained for C<SUB>20</SUB>Me<SUB>6</SUB> were compared with those for decyltrimethylammonium bromide (C<SUB>10</SUB>Me<SUB>3</SUB>). The surface tension measurement suggests that C<SUB>20</SUB>Me<SUB>6</SUB> has a folded, "wicket-like" conformation at the air–water interface. The cmc of C<SUB>20</SUB>Me<SUB>6</SUB> was smaller than that of C<SUB>10</SUB>Me<SUB>3</SUB>. The apparent ionization degree of C<SUB>20</SUB>Me<SUB>6</SUB> was larger, and the polarity of the micellar Stern layer was higher than that of C<SUB>10</SUB>Me<SUB>3</SUB>. It was found that the C<SUB>20</SUB>Me<SUB>6</SUB> micelle has an aggregation number of about 19, a hydrodynamic radius of 16 Å, and a partial molar volume of 480.49×10<SUP>−3</SUP> dm<SUP>3</SUP> mol<SUP>−1</SUP>, suggesting that the micelle is nearly spherical; thus, the main alkyl chain is almost stretched, and the outermost region of the micelle is loose.
- 公益社団法人 日本化学会の論文
著者
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Esumi Kunio
Department Of Applied Chemistry And Institute Of Colloid And Interface Science Science University Of
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Ikeda Kenji
Department De Genie Chimique Universite Nationale De Yokohama
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Yasuda Masaaki
Department Of Bioscience And Biotechnology Faculty Of Agriculture University Of Ryukyus
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Esumi Kunio
Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo
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Meguro Kenjiro
Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo
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Yasuda Masaaki
Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo
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YASUDA Masaaki
Department of Agricultural Chemistry, University of the Ryukyus
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