Micellization of surfactants in acetamide melt

Electrical conductances of solutions of sodium dodecyl sulfate (SDS) and ce tylpyridinium chloride (CPC) in acetamide melt were measured at 89 degrees C as a function of concentration. The dependence of molal conductance of SD S and CPC on concentration has been compared with that of normal electrolyt es in acetamide melt. Both SDS and CPC are found to micellize in acetamide melt. A mixed electrolyte model has been used to compute the micellization parameters, viz., critical micelle concentration, aggregation number, and c ounterion binding constant, from the conductance data. Surface potentials o f the micelles were computed by solving the nonlinearized Poisson-Boltzmann equation. The free energy terms for micellization were also evaluated.