Thermodynamic consideration of mixtures of surfactants in adsorbed films and micelles

Makoto Aratono, Masumi Villeneuve, Takanori Takiue, Norihiro Ikeda, Hidemi Iyota

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

The thermodynamic relations describing the equilibrium between the bulk solution and the adsorbed film were derived for two-component surfactant mixtures that do not share common ions. The mean activity coefficients in the adsorbed film, which can be estimated experimentally, were introduced and proven to comprise a factor attributable to the preferential adsorption of ions. The excess Gibbs energy of adsorption was defined by using the mean activity coefficients and the composition of adsorbed film. The equation of ideal mixing of two components in the adsorbed film was also derived. The analogous equations were developed with respect to the equilibrium between the bulk solution and the micelles. The equations derived were shown to be easily converted to those for ionic-ionic surfactant mixtures with common ions, and ionic-nonionic and nonionic-nonionic surfactant mixtures. Furthermore, the equations were utilized for examining the miscibility of surfactants in the decylammonium bromide (DeAB)-dodecylammonium chloride (DAC), decylammonium chloride (DeAC)-DAC, and DeAB-DeAC mixtures.

Original languageEnglish
Pages (from-to)161-171
Number of pages11
JournalJournal of Colloid And Interface Science
Volume200
Issue number1
DOIs
Publication statusPublished - Apr 1 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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