Abstract
The enthalpy-entropy compensation in ionic surfactant micellization process over a large temperature range is examined. The surfactants SDS and C16TAB are investigated experimentally, and the enthalpy and entropy changes are evaluated based on phase separation or mass action models together with the other three surfactant systems. The relationship between compensation temperature and the reference temperatures is discussed.
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Abbreviations
- ΔC p :
-
heat capacity change, J/mol-K
- CMC:
-
critical micelle concentration,M
- CMC0 :
-
critical micelle concentration atT=T 0,M
- ΔG :
-
Gibbs free energy change, kJ/mol
- ΔH :
-
enthalpy chang, kJ/mol
- Δh c :
-
enthalpy change for transfer of a methylene group to water, kJ/mol
- R :
-
gas constant, 8.314 J/mol-K
- ΔS :
-
entropy change, J/mol-K
- ΔS c :
-
entropy change for transfer of a methylene group to water, J/mol-K
- ΔS * :
-
entropy change atT=T *, J/mol-K
- T :
-
temperature,K
- T c :
-
compensation temperature, K
- T H :
-
temperature at which ΔH=0, K
- T 0 :
-
temperature at the minimum point, K
- T * :
-
112°C
- β:
-
degree of dissociation
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Lee, D.J. Enthalpy-entropy compensation in ionic micelle formation. Colloid Polym Sci 273, 539–543 (1995). https://doi.org/10.1007/BF00658683
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DOI: https://doi.org/10.1007/BF00658683