Micelle formation of ionic surfactants in polar nonaqueous solvents

TLDR: In this paper, the micelle formation of two ionic surfactants (viz., sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB)) has been studied in organic solvents of various dielectric constant and intermolecular H-bonding capability (i.e., n-methylacetamide (NMA), formanide (FA), dimethyl sulfoxide (ME/sub 2/SO), and n-n'dimethylformamide (DMF)), at

Abstract: Micelle formation of 2 ionic surfactants (viz., sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB)) has been studied in organic solvents of various dielectric constant and intermolecular H-bonding capability (viz., n-methylacetamide (NMA), formanide (FA), dimethyl sulfoxide (ME/sub 2/SO), and n-n'dimethylformamide (DMF)), at different temperatures by conductance measurements. Delta HMDO and delta SMO, standard enthalpies and entropies of micelle formation, respectively, have been determined by studying the variation of the critical micelle concentration with temperature. Compensation plots have been obtained for both the surfactants in the above solvents. The value of slope of these plots are almost identical with each other and also with that obtained in aqueous medium. Micelle formation in these solvents has been explained on the basis of several factors such as dielectric constant of the medium, its intermolecular H-bonding capability, and also its bulk structuredness. 20 references.