Abstract
A series of solutions of constant composition of the mixed micelles but different in total concentration of surfactants were prepared with the help of the Clint theory for mixed micelles consisting of octanonyl-N-methylglucamide (Mega-8) and nonanoyl-N-methylglucamide (Mega-9), and the partial molar volumes V2 were measured. The result demonstrated that the conventional procedure for investigation of the composition dependence of physical properties like V2 of mixed micelles is acceptable for the systems containing homologous surfactants. Then, the composition dependence of the partial molar volume V2 and the partial molar adiabatic compressibility Ks° were measured for the cationic mixed micelles decyltrimethylammonium bromide (C10TAB) and dodecyltrimethylammonium bromide (C12TAB) at 25 °C. In both mixed micelle systems Ks° of the micelle showed deviation from the linear relation with composition, while V2 varied linearly with the composition of the micelles. The dimension of the mixed micelles of Mega-8 and Mega-9 was also estimated from the diffusion coefficients, which showed much larger values than that of V2.
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