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Wetting of a selective solid surface by an asymmetric binary mixture.

Jörg R Silbermann1, Dirk Woywod, Martin Schoen

  • 1Stranski-Laboratorium für Physikalische und Theoretische Chemie, Sekr. TC 7, Fakultät für Mathematik und Naturwissenschaften, Technische Universität Berlin, Strasse des 17. Juni 124, D-10623 Berlin, Germany. joerg.silbermann@fluids.tu-berlin.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 20, 2004
PubMed
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This study models an asymmetric binary mixture near a selective wall, revealing B-rich films forming due to competing interactions. These films exhibit a unique temperature-dependent concentration, with an inversion point observed.

Area of Science:

  • Statistical mechanics
  • Physical chemistry
  • Materials science

Background:

  • Investigates asymmetric binary mixtures in lattice-gas models.
  • Focuses on molecular interactions and phase behavior.
  • Considers selective solid-fluid interactions.

Purpose of the Study:

  • To model and understand the phase behavior of asymmetric binary mixtures near a selective solid surface.
  • To analyze the formation and properties of wetting films.
  • To explore the temperature dependence of component concentration in these films.

Main Methods:

  • Utilized a lattice-gas model with nearest-neighbor attractions.
  • Employed a mean-field approximation for the Hamiltonian.
  • Numerically minimized the grand-potential functional to obtain phase diagrams.

Related Experiment Videos

  • Studied films wetting a solid substrate.

    • Main Results:

    • Observed the formation of B-rich mixed or demixed films near the surface, coexisting with A-rich bulk films.
    • Attributed B-rich film formation to the interplay between mixture asymmetry and surface selectivity.
    • Identified a peculiar temperature dependence of B concentration in B-rich films, including an inversion temperature T(inv).

    Conclusions:

    • The selective solid surface can induce the formation of distinct B-rich films.
    • The observed concentration behavior is a direct consequence of competing bulk and surface interactions.
    • The study provides insights into the complex phase behavior of confined mixtures.