Thermodynamics studies of cetyltrimethylammonium bromide (CTAB) in N, N-dimethyl acetamide-water mixtures

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The variations of molar conductivity of Cetyltrimethyl ammonium bromide (CTAB) in mixtures of varying concentrations of N, N-dimethyl acetamide in water at constant temperature of 22 ±0.2 oC were studied. The critical micelle concentration (CMC) for each surfactant is measured. It is found that the CMC values in mixtures of N, N-dimethyl acetamide and water solutions of various surfactants are lower than the CMC values in water, and the driving force for micelle formation correlates with solvophobicity. The surfactant-solvent interactions that drive amphiphilic self-organization in N, Ndimethyl acetamide in water are discussed. Thermodynamic parameters were evaluated for micellar system to explain the results.

N, N-dimethyl acetamide; Conductivity; Critical micelle concentration; hydrophobic interactions; Micelle