Abstract
Decyltrimethylammonium micelles with 12 univalent inorganic counterions ( X −) have been characterized by light scattering in 0.5000 m solutions of Na X at 25°C, permitting direct comparisons with about 50 organic counterions previously studied under the same conditions. For the inorganic series, CMC values are correlated with the lyotropic numbers of the counterions and with the electrocapillary maxima of mercury in 0.5000 m Na X solutions. Although literature data on anion hydration are, in most cases, uncertain estimates, there is sufficient correlation of CMC with hydration enthalpy and with the change of size of the anion upon hydration to suggest that counterions that are highly effective in promoting micellization are those that interact the least strongly with water. Refractive index data do not sustain the hypothesis that polarizability of the counterion is a significant factor in micelle formation. Thiocyanate ion induces the formation of remarkably large micelles.
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