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Complete prewetting.

P Yatsyshin1, A O Parry, S Kalliadasis

  • 1Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 24, 2016
PubMed
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We investigated interfacial transitions in confined systems, revealing complex phase diagrams influenced by intermolecular forces and fluctuations. These findings are crucial for understanding fluid behavior in various geometries.

Area of Science:

  • Physical Chemistry
  • Surface Science
  • Thermodynamics

Background:

  • Continuous interfacial transitions, analogous to 2D complete wetting, are observed.
  • These transitions are linked to first-order prewetting lines.
  • Such phenomena occur in various confining geometries like steps, patterned walls, grooves, and wedges.

Purpose of the Study:

  • To study continuous interfacial transitions in confined systems.
  • To investigate the influence of intermolecular force range and interfacial fluctuations.
  • To explore the competition between wetting, filling, and condensation phenomena.

Main Methods:

  • Utilizing microscopic classical density functional theory (DFT).
  • Modeling systems with realistic Lennard-Jones fluid-fluid and fluid-substrate potentials.

Related Experiment Videos

  • Computing mean-field fluid density profiles, adsorption isotherms, and phase diagrams.

    • Main Results:

    • Identified rich phase diagrams even for simple geometries.
    • Demonstrated sensitivity of transitions to force range and fluctuations.
    • Computed detailed fluid behavior including density profiles and isotherms.

    Conclusions:

    • Continuous interfacial transitions and prewetting lines create complex phase behavior in confined systems.
    • Interfacial fluctuations and intermolecular forces significantly impact these transitions.
    • DFT provides a robust framework for predicting fluid behavior in diverse geometries.