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Slippery Wenzel State.

Xianming Dai1, Birgitt Boschitsch Stogin1, Shikuan Yang1

  • 1Department of Mechanical and Nuclear Engineering and Materials Research Institute, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.

ACS Nano
|August 25, 2015
PubMed
Summary
This summary is machine-generated.

Highly mobile liquid droplets are achievable on both Cassie and Wenzel state surfaces. This study introduces slippery rough surfaces that maintain droplet mobility even after transitioning between states, challenging conventional understanding.

Keywords:
Cassie stateWenzel statedroplet mobilityslippery rough surfacewetting

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Area of Science:

  • Surface science
  • Fluid dynamics
  • Materials science

Background:

  • Droplet mobility on rough surfaces is crucial for industrial applications like heat transfer and water harvesting.
  • Traditionally, the Cassie state is linked to high mobility, while the Wenzel state is associated with droplet pinning.
  • Existing models often fail to predict droplet behavior on complex textured surfaces.

Purpose of the Study:

  • To challenge the conventional association of droplet mobility with specific wetting states (Cassie vs. Wenzel).
  • To investigate droplet mobility on novel slippery rough surfaces engineered with hierarchical nano- and microscale textures.
  • To evaluate the predictive capabilities of classical and recent Wenzel models under precise experimental conditions.

Main Methods:

  • Fabrication of hierarchical nano- and microscale textured surfaces.
  • Infusion of liquid lubricant into nanotextures to create slippery rough surfaces.
  • Experimental assessment of droplet mobility across Cassie-to-Wenzel state transitions.

Main Results:

  • Demonstrated high droplet mobility for both Cassie and Wenzel states on engineered slippery rough surfaces.
  • Showcased sustained droplet mobility even after the transition from Cassie to Wenzel state.
  • Identified limitations of the classical Wenzel equation in predicting wetting behavior for highly wetting liquids in the Wenzel state.

Conclusions:

  • The conventional understanding of droplet pinning in the Wenzel state is challenged by the discovery of the slippery Wenzel state.
  • Engineered slippery rough surfaces offer enhanced droplet mobility, irrespective of the wetting state.
  • Precise experimental data from these surfaces provide new benchmarks for validating and refining wetting models.