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Bi-Gaussian Stratified Wetting Model on Rough Surfaces.

Songtao Hu1, Tom Reddyhoff2, Debashis Puhan2

  • 1State Key Laboratory of Mechanical System and Vibration , Shanghai Jiao Tong University , Shanghai 200240 , China.

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This study introduces a new model for droplet wetting on complex bi-Gaussian stratified surfaces, improving predictions for lubrication and sealing applications by accounting for surface topography.

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Area of Science:

  • Surface Science
  • Tribology
  • Materials Science

Background:

  • Traditional wetting models often simplify surface roughness.
  • Real surfaces exhibit complex, bi-Gaussian stratified topographies impacting various surface phenomena.
  • Understanding wetting on such surfaces is crucial for applications like lubrication and sealing.

Purpose of the Study:

  • To develop and validate a model predicting static contact angles on bi-Gaussian stratified surfaces.
  • To integrate Wenzel and Cassie theories for enhanced wetting predictions.
  • To analyze wetting states and transitions on complex surfaces.

Main Methods:

  • A novel model combining Wenzel and Cassie theories was developed.
  • The model was tested on numerically simulated surfaces.
  • Experimental validation was performed on hydrophilic steel and hydrophobic self-assembled monolayer specimens with controlled topographies.

Main Results:

  • The model successfully predicted static contact angles on bi-Gaussian stratified surfaces.
  • Distinct Wenzel (fully wetted) and Cassie (gas trapping) states were identified and analyzed.
  • Wetting evolution and potential state transitions were assessed.

Conclusions:

  • The proposed model accurately describes wetting phenomena on bi-Gaussian stratified surfaces.
  • Accounting for bi-Gaussian stratification is essential for precise modeling of surface interactions.
  • The findings advance the understanding of wetting mechanisms in tribology and materials science.