Mixed Micellization of Alkylbenzene Sulfonate Gemini Surfactant Ia and Nonionic Surfactant C 10E 6 in Aqueous Solution

Abstract

The interaction between the alkylbenzene sulfonate Gemini surfactant Ia and the conventional nonionic surfactant C 10E 6 was investigated. The critical micelle concentrations of different mixtures were measured by surface tension measurement in aqueous solution at different temperatures. The results suggested that the critical micelle concentration of different mixtures at any mole ratio was lower than that of either pure Ia or C 10E 6 surfactant, indicating synergetic behavior. The cmc values for pure Ia, C 10E 6 surfactant, and their different mixtures at any mole ratio increased with increasing temperature. And the interaction parameter β values for the mixed micelles were negative, showing attractive interaction between these surfactant molecules. The micelle aggregation number ( N) was measured using a steady state fluorescence quenching method. The N values of the mixed surfactant system were larger than those of pure Ia but lower than those of pure C 10E 6 at all mole ratios. The micropolarity of micelles becomes small gradually with the increase of the mole ratio of the Gemini surfactant Ia.