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Three-gradient regular solution model for simple liquids wetting complex surface topologies.

Sabine Akerboom1, Marleen Kamperman1, Frans A M Leermakers1

  • 1Physical Chemistry and Soft Matter, Wageningen University, Stippeneng 4, 6708 WE Wageningen, Netherlands.

Beilstein Journal of Nanotechnology
|November 10, 2016
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Summary
This summary is machine-generated.

Liquid drop behavior on complex surfaces is modeled. Surface structure, not just wetting state, dictates contact angle changes, revealing pinning and depinning transitions are key to understanding wetting phenomena.

Keywords:
inverse opalregular solution modelself-consistent field theorysurface topologywetting

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Area of Science:

  • Surface science
  • Fluid dynamics
  • Materials science

Background:

  • Understanding liquid droplet behavior on complex surfaces is crucial for various applications.
  • Wetting phenomena, including advancing and receding contact angles, are influenced by surface topography.
  • Existing models often simplify surface complexity, limiting predictive power.

Purpose of the Study:

  • To investigate liquid droplet shape and wetting behavior on complex surface topologies.
  • To model droplets on inverse opal structures, specifically spherical cavities in a hexagonal pattern.
  • To determine the primary factors governing contact angle variations in advancing and receding wetting scenarios.

Main Methods:

  • Implementation of a three-gradient model based on regular solution theory.
  • Simulation of liquid/vapor systems in contact with intricate surface structures.
  • Analysis of both Wenzel and Cassie-Baxter wetting states without discontinuity in water front shape.

Main Results:

  • The model reproduces experimental observations of surfaces switching from hydrophilic to hydrophobic.
  • Both Wenzel (filled cavities) and Cassie-Baxter (air entrapment) wetting states were observed.
  • Contact angle variation is attributed to contact line pinning and curvature induced by surface structures, not solely air entrapment.

Conclusions:

  • Air entrapment is not the primary driver for advancing contact angle variations.
  • Surface-induced contact line pinning and depinning transitions govern wetting behavior.
  • The overall 3D surface structure, rather than simplified parameters like wetting state or kink angles, dictates the final observed contact angle.