Colloid and Polymer Science

, Volume 273, Issue 6, pp 539–543 | Cite as

Enthalpy-entropy compensation in ionic micelle formation

  • D. J. Lee
Original Contribution

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.

Key words

Enthalpy-entropy compensation ionic surfactant critical micelle concentration reference temperature temperature effect 

Notations

ΔCp

heat capacity change, J/mol-K

CMC

critical micelle concentration,M

CMC0

critical micelle concentration atT=T0,M

ΔG

Gibbs free energy change, kJ/mol

ΔH

enthalpy chang, kJ/mol

Δhc

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

ΔSc

entropy change for transfer of a methylene group to water, J/mol-K

ΔS*

entropy change atT=T*, J/mol-K

T

temperature,K

Tc

compensation temperature, K

TH

temperature at which ΔH=0, K

T0

temperature at the minimum point, K

T*

112°C

Greek Letters

β

degree of dissociation

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Copyright information

© Steinkopff Verlag 1995

Authors and Affiliations

  • D. J. Lee
    • 1
  1. 1.Department of Chemical EngineeringNational Taiwan UniversityTaipeiTaiwan ROC

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