Role of surfactant-surfactant interactions in mixed micelle solutions

Abstract

Mixed critical micelle concentration (cmc) data have been determined at 303.15 K and 313.15 K by surface tension method for aqueous solutions of sodium dodecylsulphate (SDS) (A) + Triton X-100 (B), and dodecyltrimethylammoum bromide (DTAB) (A) + Triton X-100 (B).The data have been analysed in terms of Rubingh's approach. The analysis has revealed that surfactant-surfactant interaction energies in .the mixed micelles of SDS (A) + Triton X-100 (B) and DTAB (A) + Triton X-100 (B) depend on the bulk mole fraction (X_A) of A. The interaction energy data have been rationalized in terms of molecular interactions between the surfactants A and B and the same have been further supported by viscosity data of these binary surfactant systems.