Abstract
The effect of the dipolar aprotic solvents, tetrahydrofuran (THF) and acetonitrile, on the micellization of ionic surfactants, cetyltrimethylammonium bromide (CTAB) and sodium lauryl sulphate (NaLS) was studied by (i) a spectral method at 25°C and (ii) a conductance method at different temperatures. It was observed that the critical micellar concentration (c.m.c.) is temperature dependent. The c.m.c. is found to increase with increase in mole fraction of acetonitrile and THF in aqueous solution. The increase in c.m.c. is more marked with CTAB than with NaLS in the same solvent and the c.m.c. change is greater in THF than in acetonitrile. The increase in the c.m.c. is discussed on the basis of water structure and hydrophobic interaction. The thermodynamics of micellization are also discussed.
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