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Surface and capillary transitions in an associating binary mixture model.

J M Romero-Enrique1, L F Rull, U Marini Bettolo Marconi

  • 1Department of Mathematics, Imperial College of Science, Technology and Medicine, 180 Queen's Gate, London SW7 2BZ, United Kingdom. jose.enrique@imperial.ac.uk

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 6, 2003
PubMed
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The phase diagram of associating fluid mixtures near selectively adsorbing substrates shows an increased tendency for phase separation. Surface and capillary transitions are stabilized in the one-phase region, impacting fluid behavior in porous systems.

Area of Science:

  • Physical Chemistry
  • Thermodynamics
  • Materials Science

Background:

  • Two-component associating fluid mixtures exhibit complex bulk phase diagrams with features like closed immiscibility loops.
  • Selectively adsorbing substrates can influence fluid phase behavior through surface interactions.

Purpose of the Study:

  • To investigate the effect of selectively adsorbing substrates on the phase diagram of a two-component associating fluid mixture.
  • To understand how surface and porous environments alter fluid phase separation phenomena.

Main Methods:

  • Theoretical investigation of a two-component associating fluid mixture in contact with different substrates.
  • Modeling of a planar surface, a slit pore, and an array of parallel cylinders.

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Main Results:

  • The presence of substrates enhances the tendency for phase separation below the lower critical solution point.
  • Surface and capillary transitions are stabilized within the one-phase region.
  • The geometry of the porous system influences the observed phase behavior.

Conclusions:

  • Substrate interactions significantly modify the phase diagram of associating fluid mixtures.
  • The findings provide insights into fluid behavior in confined and heterogeneous environments.
  • Results are relevant for understanding experimental observations in related systems.