Interaction of tetradecyltrimethylammonium bromide with sodium dodecyl sulfate in aqueous/urea medium at several temperatures and compositions

The simple and reliable conductivity measurement method has been inaugurated to disclose the mixed micellization behavior of two ionic surfactants (tetradecyltrimethylammonium bromide (TTAB) plus sodium dodecyl sulfate (SDS)) in H2O/NH2-CO-NH2 (urea) medium at several temperatures and compositions. The experimentally evaluated critical micelle concentration (cmc) are different those from their corresponding ideal critical micelle concentration (cmc(id)) which signifies the mutual interaction (attractive/repulsive) amongst the current constituents. The higher cmc values of distinct surfactant and mixed system in occurrence of NH2-CO-NH2 compare to water medium which also further increase through raising the amount of urea. In urea medium, the extent of degree of dissociation (g) is lower at superior composition of TTAB which implying better packing of surfactants aggregates. The magnificence of micellar mole fractions of TTAB depending of various proposed models & their ideal X-1(id) values were executed and the executed outcomes suggesting the strong contributions of TTAB in the SDS-TTAB mixed micellization. Activity coefficients of TTAB & SDS, f(1) & f(2) <1 indicate the attractive interaction amid SDS and TTAB. The negative values of Delta G(m)(0) & Delta H-m(0) suggest the spontaneity of micellization & exothermic micellization process respectively. The executed Delta S-m(0) values were positive in all cases studied herein. (C) 2019 Elsevier B.V. All rights reserved.