Wetting of surfactant solutions by alkanes

Katherine M. Wilkinson, Colin D. Bain, Hiroki Matsubara, Makoto Aratono

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Ellipsometry, surface tensiometry, and contact-angle measurement have been used to study the transition between partial wetting and pseudo-partial wetting of surfactant solutions by alkanes. In the partial wetting regime, the air-water surface tension is the same with and without alkane. In the pseudo-partial wetting regime, the air-water surface tension is lowered by the presence of alkane, showing that oil is solubilised into the surfactant monolayer. A discontinuous change in the coefficient of ellipticity with increasing surfactant concentration provides unequivocal evidence for the first-order nature of the wetting transitions. Ellipsometry has been used to explore the generality of wetting transitions of alkanes (dodecane, hexadecane, and squalane) on surfactant solutions [dodecyltrimethylammonium bromide, tetredecyltrimethylammonium bromide, dibucaine hydrochloride, and Aerosol OT (AOT)]. Of the systems studied, only hexadecane on AOT solutions did not show a wetting transition. Excess alkane remains as a lens on the surface of the surfactant solutions at all concentrations, but the contact angle is a minimum at the wetting transition. A semiquantitative model for the variation of the contact angle with surfactant concentration is provided.

Original languageEnglish
Pages (from-to)547-555
Number of pages9
JournalChemPhysChem
Volume6
Issue number3
DOIs
Publication statusPublished - Mar 1 2005

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Alkanes
Surface-Active Agents
alkanes
wetting
Wetting
surfactants
Dioctyl Sulfosuccinic Acid
Contact angle
Ellipsometry
ellipsometry
Surface tension
bromides
aerosols
interfacial tension
Dibucaine
Water
air
hydrochlorides
ellipticity
Angle measurement

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

Wetting of surfactant solutions by alkanes. / Wilkinson, Katherine M.; Bain, Colin D.; Matsubara, Hiroki; Aratono, Makoto.

In: ChemPhysChem, Vol. 6, No. 3, 01.03.2005, p. 547-555.

Research output: Contribution to journalArticle

Wilkinson, Katherine M. ; Bain, Colin D. ; Matsubara, Hiroki ; Aratono, Makoto. / Wetting of surfactant solutions by alkanes. In: ChemPhysChem. 2005 ; Vol. 6, No. 3. pp. 547-555.
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