Partial molal volumes in alkyl sulfate solutions

Abstract

Measurement of the partial molal volumes of n-hexyl and n-octyl alcohol in sodium decyl and dodecyl sulfate solutions shows that for these materials dissolution occurs with almost no change in apparent volume. From the partial molal volumes of sodium decyl and dodecyl sulfate it appears that the “hydrocarbon center” of the micelle is a slightly looser structure than in liquid hydrocarbons. Added salts and higher alcohols have very little effect on the partial molal volumes of these alkyl sulfates.