Abstract
The surface properties and mixed micellization behavior of binary combinations of ionic liquid surfactant, namely, 1-tetradecyl-3-methylimidazolium bromide ([C14mim]Br) with common cationic surfactants viz. dodecyltrimethylammonium bromide (DTAB), tetradecyltrimethylammonium bromide (TTAB), cetyltrimethylammonium bromide (CTAB), and cetylpyridinium bromide (CPB) have been investigated by surface tension and conductivity measurements. The composition of mixed micelles and the interaction parameter were evaluated from the critical micelle concentrations of single and mixed systems using Rubingh's theory. Activity coefficients of mixed systems show the extent of ideality of individual surfactant. In all mixed systems examined, deviation from ideal behavior was seen. Γmax, Amin, πCMC, and the standard Gibbs free energies of adsorption , standard Gibbs free energies of micellization have been determined. The and values are negative indicating the spontaneity of micelle formation.
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