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Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
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Efficient modelling of droplet dynamics on complex surfaces.

George Karapetsas1, Nikolaos T Chamakos, Athanasios G Papathanasiou

  • 1School of Chemical Engineering, National Technical University of Athens, Zografou Campus 15780, Greece.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 2, 2016
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Summary

This study models droplet interactions with surfaces using a new sharp-interface method. It accurately predicts droplet behavior on various surfaces, including wetting, bouncing, and sliding, especially on hydrophobic structures.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Computational physics

Background:

  • Understanding droplet dynamics on solid surfaces is crucial for various applications.
  • Existing models often require predefined contact line conditions, limiting their applicability.
  • Modeling complex interfacial phenomena, like topological changes, remains a challenge.

Purpose of the Study:

  • To develop and validate a novel sharp-interface scheme for simulating droplet-surface interactions.
  • To investigate droplet behavior on smooth and structured surfaces, including wetting and impregnation.
  • To analyze contact angle hysteresis and droplet mobility on hydrophobic surfaces.

Main Methods:

  • A novel sharp-interface numerical scheme was employed.
  • The model unifies liquid-gas and liquid-solid interfaces without explicit contact line conditions.
  • Simulations were performed for impinging and sliding droplets on various surface topographies.

Main Results:

  • The model successfully handles topological changes in interfacial flows.
  • Predictions were made for droplet impregnation, suspension ('fakir' state), and sliding behavior.
  • Contact angle hysteresis and droplet migration velocity were quantified on hydrophobic surfaces, showing reduced hysteresis with trapped air (Cassie-Baxter state).

Conclusions:

  • The sharp-interface scheme provides an efficient and versatile tool for droplet-surface dynamics.
  • The model accurately predicts droplet behavior on structured hydrophobic surfaces, consistent with experimental observations.
  • Surface topography and air inclusions significantly influence droplet mobility and contact angle hysteresis.