Abstract
Aggregation and microenvironmental properties of homo-and hetero-micelles of triton X 100 (TX 100) and sodium dodecyl sulphate (SDS) have been studied by monitoring the solubility of indicator dyes in aqueous surfactant solution. A method has been proposed for the determination of critical micelle concentration (cmc) of surfactant, the molar based distribution coefficient ( K) of the solute between the micellar and the aqueous phase and the solubility in the micellar medium ( S m). Hildebrand solubility parameter ( δ H 2) for the micelle-water interfacial region has been estimated from the value of log S m for the homomicelles. Nonlinear variation of log S m and log K with molefraction of a component surfactant of the binary mixture, SDS + TX 100 has been observed indicating nonideal mixing behaviour of the surfactants in the micelles.
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