ELECTROCHEMICAL STUDY OF THE MICELLIZATION OF HEXADECYLPYRIDINIUM BROMIDE IN BINARY METHANOL-WATER MIXTURES

A membrane electrode selective to hexadecylpyridinum bromide was used to study the micellization of the surfactant in various methanol-water mixtures at 25 degrees C. There is a linear relationship between log cmc and the weight percent of methanol in solvent mixtures. The degree of counter-ion dissociation at different solvent compositions is reported. The degree of methanol attachment was found to be 2.04. The charged phase-separation model was used to express the mechanism of the mixed micelle formation.