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Liquid-vapor transition on patterned solid surfaces in a shear flow.

Wenqi Yao1, Weiqing Ren1

  • 1Department of Mathematics, National University of Singapore, Singapore 119076.

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Summary
This summary is machine-generated.

Shear flow aids liquid transitions from the Wenzel to Cassie state on microstructured surfaces. However, it hinders the reverse transition, with the Wenzel state becoming unstable above a critical shear rate.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials science

Background:

  • Liquids on microstructured surfaces can exist in Cassie-Baxter or Wenzel states.
  • Previous studies focused on energy landscapes and barriers for state transitions.
  • The influence of external factors like shear flow on these transitions remains less explored.

Purpose of the Study:

  • To investigate the effect of shear flow on the transitions between Wenzel and Cassie states.
  • To compute the minimum action path for Wenzel-Cassie state transitions under shear flow.
  • To analyze the mechanisms and conditions governing these transitions.

Main Methods:

  • Utilized the minimum action method to compute minimum action paths.
  • Simulated transitions on surfaces patterned with straight pillars.
  • Analyzed the system's behavior under varying shear rates.

Main Results:

  • Shear flow facilitates Wenzel to Cassie state transitions while inhibiting the reverse.
  • The Wenzel state becomes unstable at a critical shear rate.
  • Two distinct transition scenarios were observed based on shear rate: groove nucleation at low rates and pillar corner nucleation at high rates.

Conclusions:

  • Shear flow significantly alters the dynamics of liquid state transitions on microstructured surfaces.
  • The direction and mechanism of Wenzel-Cassie transitions are critically dependent on shear flow conditions.
  • Understanding these flow-induced transitions is crucial for designing advanced surface functionalities.