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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
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Objective quantification of surface roughness parameters affecting superhydrophobicity.

Yoonkyung Cho1, Chung Hee Park1

  • 1Department of Textiles, Merchandising and Fashion Design, Seoul National University Seoul 08826 Republic of Korea junghee@snu.ac.kr.

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|May 6, 2022
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Summary
This summary is machine-generated.

New optical roughness parameters quantify superhydrophobicity. Adjusting pillar spacing is key for stable Cassie-Baxter states, while reducing solid area fraction is crucial for metastable states.

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Area of Science:

  • Materials Science
  • Surface Science
  • Physics

Background:

  • Superhydrophobic surfaces exhibit unique water-repellent properties crucial for various applications.
  • Understanding the relationship between surface roughness and wettability is essential for designing effective superhydrophobic materials.
  • Existing methods for characterizing roughness may not fully capture the complex topography influencing superhydrophobicity.

Purpose of the Study:

  • To introduce novel optical roughness parameters for objective quantification of surface topography.
  • To investigate the correlation between these optical parameters and the degree of superhydrophobicity.
  • To analyze how different geometric parameters influence wetting states on superhydrophobic surfaces.

Main Methods:

  • Fabrication of silicon wafer surfaces with regular square pillars using photolithography and dry etching.
  • Quantification of optical roughness parameters via image processing techniques.
  • Characterization of surface wettability using static contact angle and sliding angle measurements with varying water droplet volumes.

Main Results:

  • Seven distinct optical roughness parameters were derived to comprehensively describe surface topography.
  • Two intermediate wetting states (intermediate state I and II) were observed between the Cassie-Baxter and Wenzel states.
  • Pillar spacing significantly impacts contact angle and sliding angle in the stable Cassie-Baxter state, more so than solid area fraction.
  • Reducing solid area fraction is critical for maintaining a stable Cassie-Baxter state in metastable conditions.

Conclusions:

  • The proposed optical roughness parameters offer a quantitative approach to analyze surface topography.
  • These parameters provide valuable insights into the complex interplay between roughness and superhydrophobicity.
  • Findings guide the design of superhydrophobic surfaces by optimizing geometric features for desired wetting behaviors.