Abstract
The solubilization of n-hexanol by mixed anionic/nonionic and cationic/nonionic micelles was measured throughout a wide range of hexanol activities. The solubilization equilibrium constant for both kinds of mixed micelles is less than that predicted by assuming that the equilibrium constant varies linearly with nonionic/total surfactant mole ratio in the micelle. This effect is more pronounced for the anionic/nonionic mixture than for the cationic/nonionic mixture. The results are attributed to the decrease in micellar surface charge density upon insertion of nonionic surfactant in the micelle. This results in a decrease in ion-dipole attractive forces between the ionic surfactant hydrophilic group and the alcohol hydroxyl group.
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