The excess thermodynamic quantities of adsorption of a binary nonionic surfactant mixture

Makoto Aratono, Akio Ohta, Hisanobu Minamizawa, Norihiro Ikeda, Hidemi Iyota, Takanori Takiue

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


The thermodynamic relations were developed for examining the miscibility of surfactants in the adsorbed film from the viewpoints of the thermodynamic quantities of adsorption such as Gibbs free energy, entropy, volume, enthalpy, and energy. The deviation from the additivity relation, the straight line connecting the thermodynamic quantities of the respective pure surfactants as a function of the composition of the adsorbed film, was proved to yield the corresponding excess quantities of adsorption. The criterion of the ideal mixing was offered and summarized with respect to the composition of adsorbed film, the mean area occupied by surfactants, and the thermodynamic quantities of adsorption. The resulting equations were applied to the simple nonionic surfactants mixture of decyl methyl sulfoxide (DeMS) and octyl methyl sulfoxide (OMS). The surface tension of the aqueous solution was measured as a function of not only the total molality and mole fraction of surfactants but also temperature under atmospheric pressure.

Original languageEnglish
Pages (from-to)128-136
Number of pages9
JournalJournal of Colloid And Interface Science
Issue number1
Publication statusPublished - Sept 1 1999

All Science Journal Classification (ASJC) codes

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


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