The Second CMC of the Aqueous Solution of Sodium Dodecyl Sulfate. II. Viscosity and Density
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概要
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Our viscosity and density studies of an aqueous solution of sodium dodecyl sulfate have revealed that the 2nd critical micelle concentration (CMC) exists in addition to the 1st CMC and that the 2nd CMC is greatly influenced by such additives as sodium chloride, dodecyl alcohol, and benzene; these results are in good agreement with those obtained from the conductivity measurements described in the previous paper. The reduced viscosity of the micelle (η<SUB><I>sp</I>.<I>m</I></SUB>/<I>C<SUB>m</SUB></I>) <I>vs.</I> <I>C<SUB>m</SUB></I> curve showed a knick at the concentration corresponding to the 2nd CMC as obtained by Tyuzyo and his co-workers. The molar volume of the hydrated micelle was calculated by using the equation: η<SUB><I>r</I>.<I>m</I></SUB>=1+2.5φ<I><SUB>m</SUB></I>+14.1φ<I><SUB>m</SUB></I><SUP>2</SUP>; it has been found to decrease at about the 2nd CMC, similarly to the partial specific volume (\bar<I>v</I>) of SDS obtained from the density measurement. This may be attributed to a change in the micelle structure at the 2nd CMC, caused by a variation in the type of aggregation and by a decrease in the counter-ion binding by the micelle.
- 公益社団法人 日本化学会の論文
著者
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KODAMA Michiko
Department of Biochemistry, Okayama University of Science
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Miura Masaji
Department of Chemistry, Faculty of Science, Hiroshima University
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Kodama Michiko
Department of Chemistry, Faculty of Science, Hiroshima University
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