Wetting and freezing of hexadecane on an aqueous surfactant solution: Triple point in a 2-D film

Hiroki Matsubara, E. Ohtomi, Makoto Aratono, Colin D. Bain

研究成果: Contribution to journalArticle査読

16 被引用数 (Scopus)

抄録

Wetting of water by hexadecane has been investigated by ellipsometry as a function of the concentration of the cationic surfactant dodecyltrimethylammonium bromide (DTAB) in the aqueous phase and temperature. Three phases are identified: a 2-D gas of hexadecane molecules and DTAB molecules, a 2-D liquid comprising a mixed monolayer of hexadecane and DTAB, and a 2-D 'solid' phase. Evidence is presented to support the hypothesis that the liquid-solid phase transition is actually a wetting transition in which a surface-frozen layer of pure hexadecane wets the liquid-like mixed monolayer of hexadecane and DTAB. The triple point, at which the three phases coexist, is located at a temperature of 17.3°C and DTAB concentration of 0.75 mmol kg-1. The slopes of the three phase boundaries are analyzed thermodynamically.

本文言語英語
ページ(範囲)11664-11668
ページ数5
ジャーナルJournal of Physical Chemistry B
112
37
DOI
出版ステータス出版済み - 9 18 2008

All Science Journal Classification (ASJC) codes

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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