Counter ion effect on phase behavior in adsorbed film of fluoroalkanol and cationic surfactant mixture

K. Shibata, T. Matsuda, R. Fujimoto, T. Takiue, H. Matsubara, M. Aratono

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The surface tension of the 1H,1H-heptafluoro-1-butanol (FC4OH)-dodecyltrimethylammonium chloride (DTAC) mixed aqueous solution was measured as a function of the total molality of the mixture and the composition of DTAC at 298.15 K under atmospheric pressure. The phase diagram of adsorption (PDA) that gives the composition relation between the aqueous solution and adsorbed film was constructed. It was suggested that the subtle balance between the attractive surfactant cation-OH dipole interaction and the weak dispersion interaction between C-H and C-F chains is crucial for the phase behavior. The phase diagram of adsorbed film (PDAF) showing the composition relation between the different state of adsorbed films demonstrated the phase behavior is significantly dependent on the degree of counter ion binding. Moreover, the possible surface structures at the azeotropes are suggested.

Original languageEnglish
Pages (from-to)36-41
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume292
Issue number1
DOIs
Publication statusPublished - Jan 5 2007

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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