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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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How droplets pin on solid surfaces.

Jinming Zhang1, Wei Ding1, Uwe Hampel2

  • 1Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Fluid Dynamics, Dresden 01328, Germany.

Journal of Colloid and Interface Science
|March 12, 2023
PubMed
Summary
This summary is machine-generated.

Droplet friction on surfaces has static and kinetic regimes. This study reveals static friction depends on surface defects, with chemical heterogeneity linked to contact line length and atomic/topographical defects to contact area.

Keywords:
Contact line pinningDroplet-solid frictionEnergy dissipationStatic friction forceSurface defectsWetting dynamics

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Area of Science:

  • Surface science
  • Tribology
  • Computational physics

Background:

  • Droplet-solid friction exhibits static and kinetic regimes, analogous to solid-solid friction.
  • The mechanisms governing static friction in droplet-solid interactions remain less understood.
  • Existing research well-characterizes kinetic friction but lacks detail on static friction origins.

Purpose of the Study:

  • To investigate the mechanisms of droplet-solid static friction.
  • To test the hypothesis that static friction is contact area dependent, drawing parallels with solid-solid friction.
  • To elucidate the role of surface defects in droplet static friction.

Main Methods:

  • Deconstruction of complex surface defects into atomic structure, topographical, and chemical heterogeneity.
  • Application of large-scale Molecular Dynamics simulations.
  • Analysis of droplet-solid static friction forces induced by primary surface defects.

Main Results:

  • Identification of three element-wise static friction forces linked to primary surface defects.
  • Demonstration that static friction from chemical heterogeneity depends on contact line length.
  • Finding that static friction from atomic structure and topographical defects is contact area dependent.
  • Observation of energy dissipation and droplet wiggle during static-kinetic transition due to atomic/topographical defects.

Conclusions:

  • Surface defects significantly influence droplet-solid static friction.
  • Static friction mechanisms differ based on the type of surface defect.
  • Contact area and contact line length are critical parameters in droplet static friction.