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Updated: Jul 31, 2025

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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Wettability gradient-driven droplets with an applied external force.

Leon Topp1, Lena Haddick1, Dominik Mählmann1

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The Journal of Chemical Physics
|May 1, 2023
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Summary
This summary is machine-generated.

Droplet sliding velocity under combined forces is nearly constant, primarily influenced by the initial substrate

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Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Droplet sliding on homogeneous substrates is driven by external forces like gravity.
  • Wettability gradients induce internal driving forces, enabling sliding without external input.

Purpose of the Study:

  • Investigate droplet sliding dynamics under combined external and internal driving forces.
  • Analyze limiting cases with single driving forces for comparison.

Main Methods:

  • Molecular dynamics simulations were employed to model droplet behavior.
  • Simulations examined droplet motion over substrates with varying wettability.

Main Results:

  • Droplet velocity remained nearly constant during much of the sliding process over the wettability borderline.
  • Effective mobility was mainly determined by the initial substrate's mobility at the receding contact line.
  • Effective force comprised the external force plus a renormalized internal force, indicating enhanced dissipation with wettability gradients.

Conclusions:

  • Receding contact line desorption is the rate-limiting step in droplet sliding.
  • Wettability gradients introduce significant dissipation effects on droplet motion.