Abstract
Surface tension and viscosity measurements have been carried out for two surfactant binary mixtures, namely, sodium dodecyl sulphate (SDS) + Triton X-100 and dodecyltrimethylammonium bromide (DTAB) + Triton X-100, each in 1,4-dioxane + H 2O at 303.15 and 313.15 K. From the mixed critical micelle concentration (values obtained from surface tension data), the interaction parameter β has been calculated using the regular solution treatment of Rubingh for mixed surfactant micelles; β values have been rationalized in terms of the intermolecular interactions between unlike surfactant molecules in the mixed solvent. The magnitude of surfactant—surfactant interactions within the mixed micelles in 1,4-dioxane + water is lower than that in pure water. Further, interaction between anionic—non-ionic surfactants was found to be stronger than in cationic—non-ionic surfactant.
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