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

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)11664-11668
Number of pages5
JournalJournal of Physical Chemistry B
Volume112
Issue number37
DOIs
Publication statusPublished - Sep 18 2008

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Surface-Active Agents
Freezing
freezing
wetting
Wetting
bromides
Surface active agents
surfactants
Monolayers
Liquids
Molecules
Cationic surfactants
Ellipsometry
Phase boundaries
solid phases
liquids
Phase transitions
Temperature
Phase Transition
ellipsometry

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Wetting and freezing of hexadecane on an aqueous surfactant solution : Triple point in a 2-D film. / Matsubara, Hiroki; Ohtomi, E.; Aratono, Makoto; Bain, Colin D.

In: Journal of Physical Chemistry B, Vol. 112, No. 37, 18.09.2008, p. 11664-11668.

Research output: Contribution to journalArticle

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