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Equilibrium droplet shapes on chemically patterned surfaces: theoretical calculation, phase-field simulation, and

Yanchen Wu1, Mariia Kuzina2, Fei Wang1

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Keywords:
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Area of Science:

  • Surface Science
  • Fluid Dynamics
  • Materials Science

Background:

  • Surface heterogeneity significantly influences droplet wetting.
  • Patterned wettability can induce anisotropic wetting behaviors.
  • Droplet size relative to heterogeneity challenges traditional wetting theories.

Purpose of the Study:

  • Investigate equilibrium droplet shapes on chemically patterned substrates.
  • Develop predictive models for anisotropic wetting morphologies.
  • Explore droplet wetting beyond conventional theories.

Main Methods:

  • Analytical modeling with sharp interface treatment.
  • Phase-field simulations with diffuse interface treatment.
  • Experimental validation using chemically patterned glass substrates.

Main Results:

  • Observed various anisotropic wetting shapes across all methods.
  • Demonstrated excellent agreement between analytical, simulation, and experimental results.
  • Reported novel non-rotationally symmetric droplet shapes and anisotropic wetting during evaporation.

Conclusions:

  • Thermodynamic surface energy minimization accurately predicts wetting morphologies.
  • Established quantitative methods for anisotropic wetting on patterned substrates.
  • Advanced understanding of droplet behavior on heterogeneous surfaces.