Micellization behavior of [C-16-4-C-16], 2Br(-) gemini surfactant in binary aqueous-solvent mixtures

The micellization behavior of a bis cationic gemini surfactant, C16H33N+(CH3)(2)-(CH2)(4)-N+(CH3)(2)C16H33, 2Br(-) has been studied in binary aqueous mixtures of dimethyl sulfoxide, methanol, 1, 4-dioxane, dimethyl formamide and ethylene glycol by conductivity measurements at 300-320 K. The critical micelle concentration, degree of micellar ionization and thermodynamic parameters, i.e, Gibbs free energy. enthalpy, and entropy of micellization of the gemini surfactant have also been determined. The cmc increases whereas Gibbs free energy decreases with increasing volume percentage of organic solvents in the organic solvent-water binary mixture. The negative value of enthalpy of micellization indicates that the micellization process is exothermic.