THE PARTITIONING OF N-HEXANOL INTO MICELLES OF CETYLTRIMETHYLAMMONIUM BROMIDE IN AQUEOUS-SOLUTION - ULTRASONIC RELAXATION AND HEADSPACE ANALYSIS MEASUREMENTS

The partitioning of n-hexanol between aqueous solution and cetyltrimethylammonium bromide micelles has been studied using head-space analysis involving gas chromatography and ultrasonic relaxation. The study has been carried out over varying concentrations of hexanol up to 0.18 mol dm-3 in both 0.05 and 0.075 mol dm-3 surfactant solutions. Over the concentration range in question the parameters that monitor the equilibrium aspects of the partitioning process can be adequately described on the basis of a simple two-state process involving ''free'' and ''solubilized'' hexanol. On the other hand, the kinetic parameters show marked deviations at the higher hexanol concentrations which are close to the phase boundary.