Estimation of micellization parameters of cetylpyridinium chloride in water using the mixed electrolyte model for conductance

The mixed-electrolyte model proposed recently by Shanks and Franses has bee n applied to estimate the critical micelle concentration, aggregation numbe r, and counterion binding constant of cetyl pyridinium chloride from its me asured conductance data in water at 25 degreesC. The surface potential of t his cationic micelle has been computed by solving the non-linearized Poisso n-Boltzmann equation. The electrostatic, hydrophobic, and the overall free energies of the ionic micelle formation have also been calculated. The pres ent study also envisages that ionic micelles do not contribute to the ionic strength of the surfactant solution.