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Droplet Mobility Manipulation on Porous Media Using Backpressure.

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Summary

Applying backpressure to sessile droplets on hydrophobic surfaces controls their mobility. Increased backpressure reversibly transitions droplets from sticky to slippery states, enabling controlled movement via contact line depinning and wave propagation.

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Wetting phenomena on hydrophobic surfaces are influenced by gas pockets at the solid-liquid interface.
  • Controlling droplet behavior is crucial for microfluidics and surface engineering.

Purpose of the Study:

  • To investigate droplet actuation and mobility control on hydrophobic surfaces using backpressure.
  • To understand the transition from sticky to slippery states by modulating backpressure.

Main Methods:

  • Experimental measurement of sliding angles for deionized (DI) water and ethanol droplets under varying backpressure.
  • 2D computational simulations using momentum conservation, continuity, and Cahn-Hilliard phase-field equations.
  • Analytical calculations of contact line depinning based on force balance.

Main Results:

  • Backpressure reversibly controls droplet mobility, transitioning them from sticky to slippery states.
  • A 50 μL water droplet's sliding angle reduces from 45° to 0° at ~0.60 bar backpressure.
  • Lower backpressure is needed for liquids with lower surface energy.

Conclusions:

  • Droplet actuation is achieved by depinning the receding contact line and forward wave propagation.
  • Backpressure is an effective mechanism for manipulating sessile droplet mobility on hydrophobic surfaces.
  • Simulations and analytical models corroborate the experimental findings on contact line depinning.