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Alkane/Alcohol mixed monolayers at the solid/liquid interface.

Loic Messe1, Ana Perdigon, Stuart M Clarke

  • 1BP Institute and Department of Chemistry, University of Cambridge, Madingley Rise, Madingley Road, Cambridge CB3 0HE, U.K.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 18, 2005
PubMed
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Solid monolayers of alcohol/alkane mixtures form on graphite. Alcohols preferentially adsorb over alkanes, leading to significant phase separation, unlike alkane/alkane or alcohol/alcohol mixtures.

Area of Science:

  • Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Understanding the behavior of adsorbed molecular mixtures is crucial for surface science and materials applications.
  • Binary mixtures of alkanes and alcohols form solid monolayers on graphite surfaces from liquid mixtures.

Purpose of the Study:

  • To investigate the surface phase behavior and mixing properties of solid monolayers formed from binary mixtures of alkanes and alcohols adsorbed on graphite.
  • To compare the mixing behavior of alcohol/alkane mixtures with alkane/alkane and alcohol/alcohol mixtures.

Main Methods:

  • Differential scanning calorimetry (DSC) to identify surface phase behavior.
  • Elastic neutron incoherent scattering to determine monolayer composition.
  • Regular solution approach to model mixing behavior and preferential adsorption.

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Main Results:

  • Solid monolayers form for all investigated alcohol/alkane combinations.
  • Alcohols exhibit preferential adsorption over alkanes, even shorter alcohols over longer alkanes.
  • Significant phase separation occurs in alcohol/alkane monolayers, contrasting with alkane/alkane and alcohol/alcohol mixtures where similar-sized molecules mix well.

Conclusions:

  • Alcohol/alkane mixtures show distinct mixing behavior compared to homologous mixtures.
  • Preferential adsorption and phase separation are key characteristics of alcohol/alkane monolayers on graphite.
  • The findings provide insights into molecular interactions at surfaces.