Study on the miscibility of lithium dodecyl sulfate and lithium perfluorooctane sulfonate in the adsorbed film and micelle

Hitoshi Matsuki, Norihiro Ikeda, Makoto Aratono, Shoji Kaneshina, Kinsi Motomura

研究成果: Contribution to journalArticle査読

24 被引用数 (Scopus)

抄録

The surface tension of the aqueous solution of lithium dodecyl sulfate (LiDS) and lithium perfluorooctane sulfonate (LiFOS) mixture was measured as a function of the total molality and composition of surfactants at 298.15 K under atmospheric pressure. The compositions in the adsorbed film and micelle were evaluated by applying the thermodynamic equations to the experimental results. It was found that the LiDS and LiFOS molecules mix homogeneously with each other in the adsorbed film and the mole fraction of LiFOS in the total surfactant in the adsorbed film is larger than that in the solution. However, the molecules turned out to be partially immiscible in the micellar state and to form the two kinds of micelles which coexist in equilibrium only at the composition of the maximum of critical micelle concentration vs composition curve. This behavior was attributed to the repulsive interaction between the hydrocarbon and fluorocarbon chains of the surfactants. Further, it was suggested that the interaction between LiDS and LiFOS molecules in the micelle is weaker than that in the adsorbed film.

本文言語英語
ページ(範囲)331-337
ページ数7
ジャーナルJournal of Colloid And Interface Science
150
2
DOI
出版ステータス出版済み - 5 1992

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 生体材料
  • 表面、皮膜および薄膜
  • コロイド化学および表面化学

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