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Dynamic Repellency of Water-Proof Surfaces.

Zidong Zhan1,2, Cunlong Yu1,3, Zhuoxing Liu1,2

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Summary
This summary is machine-generated.

A new normal force-based method accurately quantifies dynamic wettability, overcoming limitations of optical techniques. This approach, using a characteristic parameter K, is vital for advancing liquid-repellent surfaces in technology and biology.

Keywords:
contact anglemicro/nanostructurerepellencysuperhydrophobicwettability

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Area of Science:

  • Surface Science
  • Materials Science
  • Physics

Background:

  • Dynamic wettability is crucial for biological and technological applications.
  • Conventional optical methods (e.g., goniometry) struggle with baseline determination, surface topography, and micro/nanostructures, limiting liquid-repellent surface development.
  • Existing techniques often fail to accurately capture the complex interactions at the liquid-solid interface.

Purpose of the Study:

  • To introduce a novel normal force-based method for precise dynamic wettability quantification.
  • To develop a characteristic parameter, K, derived from force curves during dynamic receding states.
  • To overcome the limitations of optical methods in assessing liquid-repellent surfaces.

Main Methods:

  • Utilizing a normal force-based technique to measure dynamic wettability.
  • Deriving a characteristic parameter, K, from force curves during the dynamic receding state of the contact line.
  • Validating the method across diverse artificial and natural substrates.

Main Results:

  • The normal force-based method accurately quantifies dynamic wettability, avoiding optical distortions and accounting for droplet compression.
  • The characteristic parameter K successfully classifies surfaces into Wenzel, Cassie, and combined states.
  • K is shown to depend exclusively on the liquid-solid interface, arising from normal force, surface energy, and adhesion work.

Conclusions:

  • The developed force-derivation method offers a robust and accurate approach to quantifying dynamic wettability.
  • The characteristic parameter K is a significant advancement for understanding and designing liquid-repellent surfaces.
  • This method has broad applicability in areas such as self-cleaning technologies, agricultural sprays, and impact dynamics, enabling precise prediction of surface behavior.