Journal
PHYSICS AND CHEMISTRY OF LIQUIDS
Volume 52, Issue 2, Pages 305-319Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00319104.2013.832249
Keywords
sodium lauroylsarcosinate; thermodynamic parameters; enthalpy-entropy compensation; alcohols; micellisation
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Aggregation of sodium lauroylsarcosinate (SLS) in aqueous solutions of methanol, ethanol, propanol and ethylene glycol at 288-313K has been determined from conductivity measurement in the range 0-20% v/v of additives. The precise values of the critical micelle concentration (CMC) and the degree of counter-ion dissociation of micelles were obtained at each temperature by fitting the specific conductivity-surfactant concentration curve to the integrated form of the Boltzmann-sigmoid equation. The CMC was found to increase with increase in additive concentrations in the case of methanol and ethylene glycol, while it decreases with increase in ethanol and propanol concentration. The equilibrium model of micelle formation was applied to obtain the thermodynamic parameters of micellisation. The Gibbs free energies were observed to vary only slightly with temperature and additive concentrations. Enthalpy-entropy compensation was observed for all the systems with a constant compensation temperature of approximate to 300K and negative compensation enthalpy.
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