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

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 (Delta G(m)(o)), the standard free energy ans' of surfactant tail transfer (Delta G(trans)(o)) influence of NaPSS concentration and CTAB/NaPSS molar ratio, slopes (S-1 and S-2), correlation of with relative permittivity (D), Reichardt's parameter (E-T(30)), viscosity (eta(o)), Hildebrand parameter (delta), solvophobic parameter (S-p), correlation of degree of association (alpha) with S-p, correlation of Delta G(m)(o), with volume fraction of methanol, gibbs energy difference (Delta G(ps)(o)), degree of binding (beta), free energy of binding (Delta G(b)(o)), the standard Gibbs energy (Delta G(t)(o)), correlation of kappa(o)/kappa(cmc), cmc/cac, cac/cmc*, Delta G(t)(o)/Delta G(m)(o), Delta G(b)(o)/Delta G(m)(o), Delta G(ps)(o)/Delta G(m)(o) 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. (C) 2019 Elsevier B.V. All rights reserved.