Wetting transition at the liquid-air interface of methanol-alkane mixtures

Ernesto Carrillo, Vicente A Talanquer, Miguel Costas

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Wetting transition (Tw) and consolute (CT) temperatures close to the upper critical solution temperature (UCST) have been determined for methanol + n-alkane mixtures where n = 6-12. Tw and the CT were also measured for noninteger n values, i.e., for mixtures of methanol + a binary mixture of two normal alkanes. The liquid-vapor surface tension (σLV) and the liquid-liquid interfacial tension (σLL) were measured at 25°C. For all mixtures studied the methanol rich-phase is denser than the alkane rich-phase. It is found that while the CT increases continuously, the Tw first increases and then decreases as a function of n. This is the first time that, for a homologous series of mixtures, this behavior has been found. For 6 ≤ n ≤ 8.25 the observed wetting transition was from partial wetting to nonwetting (the alkane rich-phase intrudes between the methanol rich-phase and the vapor) while for 8.5 ≤ n ≤ 12 the transition was from partial to total wetting (the methanol-rich phase intrudes between the alkane rich-phase and the vapor). Both the change of Tw and the inversion in the nature of the wetting phase with n are in qualitative agreement with the predictions of a recently developed mean-field model where a normalized parameter b, whose calculation involves σLV and σLL, plays the role of n in the experiments.

Original languageEnglish (US)
Pages (from-to)5888-5891
Number of pages4
JournalJournal of Physical Chemistry
Volume100
Issue number14
StatePublished - Apr 4 1996
Externally publishedYes

Fingerprint

liquid air
Alkanes
Paraffins
alkanes
wetting
Methanol
Wetting
methyl alcohol
Liquids
Air
Vapors
vapors
Surface tension
interfacial tension
liquids
Binary mixtures
binary mixtures
inversions
Temperature
temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Engineering(all)

Cite this

Wetting transition at the liquid-air interface of methanol-alkane mixtures. / Carrillo, Ernesto; Talanquer, Vicente A; Costas, Miguel.

In: Journal of Physical Chemistry, Vol. 100, No. 14, 04.04.1996, p. 5888-5891.

Research output: Contribution to journalArticle

Carrillo, Ernesto ; Talanquer, Vicente A ; Costas, Miguel. / Wetting transition at the liquid-air interface of methanol-alkane mixtures. In: Journal of Physical Chemistry. 1996 ; Vol. 100, No. 14. pp. 5888-5891.
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