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A Surface Equation of State for a Partially Soluble Ionized Surfactant

Authors
Journal
Journal of Colloid and Interface Science
0021-9797
Publisher
Elsevier
Publication Date
Volume
195
Issue
1
Identifiers
DOI: 10.1006/jcis.1997.5129
Keywords
  • Interface
  • Thermodynamics
  • Dividing Surface
  • Interfacial Tension

Abstract

Abstract The surface pressure and adsorption isotherm as functions of surfactant and salt concentration are determined for an ionized surfactant. This analysis differs from previous work in that the surfactant, while ionized in the bulk solution, is assumed to be nonionized at the surface. The analysis is applied to several soluble surfactants and provides a reasonable fit to experimental surface pressure data. With this analysis, the surface solution is found to be ideal for a number of surfactants, so one less parameter is required than is used by the regular solution theory model of Lucassen-Reynders (1).

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