Study on Aggregation Behaviour of Mixture of Alkylbenzene Sulfonate Gemini Surfactant Ib and Nonionic Surfactant Triton X-100

The interaction between the anionic Gemini surfactant Ib and the conventional nonionic surfactant Triton X-100 was investigated. The critical micelle concentrations (cmc) of different mixtures were measured by surface tension measurement at 298 K. The results showed that the cmc of different mixtures at any mole ratio was lower than that of either pure Ib or Triton X-100, indicating synergetic behavior. And the interaction parameter ß values for the mixed micelles were negative, showing attractive interaction between these surfactant molecules. Besides, 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 that of pure Ib but lower than pure Triton X-100 at any ratio.