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Wetting morphologies and their transitions in grooved substrates.

Ralf Seemann1, Martin Brinkmann, Stephan Herminghaus

  • 1Experimental Physics, Saarland University, D-66123 Saarbrücken, Germany. r.seemann@physik.uni-saarland.de

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Surface topography complexity dictates liquid wetting patterns. Elastic substrates and electrowetting offer control over liquid morphology and transport, with reduced imbibition in deformable grooves.

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Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Complex surface topographies on natural and artificial materials exhibit diverse liquid interfacial morphologies when exposed to partially wetting liquids.
  • Understanding these wetting behaviors is crucial for applications in microfluidics, coatings, and biomaterials.

Purpose of the Study:

  • To investigate the statics and dynamics of liquid wetting morphologies on paradigmatic surface topographies.
  • To explore the influence of surface complexity, elastic deformability, and electrowetting on liquid behavior.

Main Methods:

  • Analysis of liquid interfacial morphologies on various groove structures.
  • Investigation of wetting phenomena on elastically deformable substrates.
  • Application of electrowetting techniques on conductive substrates.

Main Results:

  • Wetting morphology spectrum increases with groove structure complexity.
  • Deformable substrates exhibit additional structures due to capillary-induced geometry changes.
  • Liquid transport can be controlled via wettability and geometry changes, including reversible/irreversible transport using electrowetting.
  • Imbibition velocity is reduced in deformable grooves due to microscopic material deformation.

Conclusions:

  • Surface topography and material properties significantly influence liquid wetting and transport.
  • Elasticity and electrowetting provide tunable control over liquid morphologies and movement.
  • Deformable surfaces present unique wetting dynamics with reduced imbibition rates.