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Alexandr Malijevský1

  • 1Department of Physical Chemistry, Institute of Chemical Technology, Prague, 166 28 Praha 6, Czech Republic and Institute of Chemical Process Fundamentals, Academy of Sciences, 16502 Prague 6, Czech Republic.

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|November 17, 2014
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Summary
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Surface roughness surprisingly hinders wetting on microscopic scales, contrary to macroscopic predictions. This study reveals a critical length-scale crossover affecting surface wettability and thermodynamic laws.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Thermodynamics

Background:

  • Solid surfaces exhibit microscopic roughness.
  • Macroscopic theories like Wenzel's law predict roughness amplifies wetting.
  • The effect of microscopic roughness on wetting is not fully understood.

Purpose of the Study:

  • Investigate the impact of microscopic surface roughness on hydrophilic substrate wetting.
  • Determine if roughness amplifies or hinders wetting at the microscopic level.
  • Identify the crossover scale governing the transition in roughness effects.

Main Methods:

  • Utilized fundamental measure density functional theory.
  • Performed three independent analyses to validate findings.
  • Examined wetting properties of microscopically corrugated surfaces.

Main Results:

  • Microscopic surface corrugation was found to hinder wetting.
  • Increased wetting temperature or hydrophobicity was observed due to microscopic roughness.
  • A crossover in length scales dictates opposite responses to surface roughening.

Conclusions:

  • Microscopic roughness can decrease, not amplify, wetting.
  • Wenzel's law may not apply universally across length scales.
  • Thermodynamic predictions for surface properties require careful consideration of scale.