Abstract
Effects of varying concentrations of 1,2-ethanediol, 1,2-butanediol and 1,2-hexanediol (glycols) on the micellisation and thermodynamic properties of sodium dodecyl sulphate (SDS) were studied at temperature range 288–313 K by conductometry method. Critical micelle concentration (CMC) of SDS increased in 1,2-ethanediol but decreased in the longer carbon chain glycols in the order: 1,2-hexanediol < 1,2-butanediol < pure water < 1,2-ethanediol. As temperature increased, CMC of SDS increased linearly in 1,2-ethanediol. Conversely, minimum CMC values were observed in 1,2-butanediol and 1,2- hexanediol between 293 K and 303 K at the temperature range studied, indicating more ordered water structure is favoured by the longer hydrocarbon chain glycols. values were negative at all temperatures for all glycol concentrations indicating the micellisation process is energetically favourable. Enthalpy–entropy compensation plots gave fairly constant compensation temperature values (≈300 K) for all the systems while compensation enthalpy values were less negative as the glycol concentration increased.
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