Micellization of cetylpyridinium chloride using conductometric technique

Conductometric technique has been used to investigate the equilibrium prope rties of cetylpyridinium chloride (CPC) in the presence of a series of alip hatic alcohols. The dependence of conductivity of surfactant solution in th e presence of particular amount of alcohol has been studied. According to t he experimental results, ethanol cause to decrease the dielectric constant and conductivity of micellar solution. Alcohols with longer chain may chang e the conductivity of solution depend on concentration of surfactant. At lo w concentration of CPC near critical micelle concentration (cmc) region, th e minimum value of conductivity can be observed. This minimum value can be controlled by decreasing of free monomer concentration and also increasing degree of dissociation of micelle because of penetration of alcohols in mic ellar core. Using Conductometric technique cmc and alpha (degree of dissoci ation of counterion) of CPC were evaluated. The micelle formation of CPC ha s been considered in ethylene glycol (E.G)/ water and glycerol/water mixtur es. It has been shown, the logarithm of cmc is directly depended on the rat io of E.G/water or glycerol/water.