Micellization behavior of cetyltrimethylammonium bromide in the absence and presence of sodium polystyrene sulfonate in water and methanol-water mixture: A conductivity approach

Abstract

Different micellization properties of cetyltrimethylammonium bromide (CTAB) in the absence and presence of 0.0001 monomol·L−1 and 0.001 monomol·L−1 of sodium polystyrene sulfonate (NaPSS) in water, 0.1 and 0.2 volume fraction of methanol-water mixture at 298.15 K such as the critical aggregation concentration (cac), critical micellar concentration (cmc) and the apparent critical micellar concentration (cmc*) have been discussed from the conductivity study. The values of standard free energies of micellization (ΔGmo), the standard free energy of surfactant tail transfer (∆Gtranso), influence of NaPSS concentration and CTAB/NaPSS molar ratio, slopes (S1 and S2), correlation of ∆Gmo with relative permittivity (D), Reichardt's parameter (ET (30)), viscosity (ηo), Hildebrand parameter (δ), solvophobic parameter (SP), correlation of degree of association (α) with SP, correlation of ∆Gmo with volume fraction of methanol, gibbs energy difference (ΔGpso), degree of binding (β), free energy of binding (∆Gbo), the standard Gibbs energy (∆Gto), correlation of κoκcmc,cmccac,caccmc∗,ΔGtoΔGmo,ΔGboΔGmo,ΔGpsoΔGmo with volume fraction of methanol, correlation of (cmc/cac) and (cac/cmc*) with volume fraction of methanol and variation of cac with charge density are also included in this study.