Cassie-Baxter to Wenzel state wetting transition: Scaling of the front velocity

A.M. Peters, C. Pirat, M. Sbragaglia, B.M. Borkent, Matthias Wessling, Detlef Lohse, Rob G.H. Lammertink

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Abstract

We experimentally study the dynamics of water in the Cassie-Baxter state to Wenzel state transition on surfaces decorated with assemblies of micrometer-size square pillars arranged on a square lattice. The transition on the micro-patterned superhydrophobic polymer surfaces is followed with a high-speed camera. Detailed analysis of the movement of the liquid during this transition reveals the wetting front velocity dependence on the geometry and material properties. We show that a decrease in gap size as well as an increase in pillar height and intrinsic material hydrophobicity result in a lower front velocity. Scaling arguments based on balancing surface forces and viscous dissipation allow us to derive a relation with which we can rescale all experimentally measured front velocities, obtained for various pattern geometries and materials, on one single curve.
Original languageUndefined
Pages (from-to)391-397
JournalEuropean physical journal. E
Volume29
Issue number4
DOIs
Publication statusPublished - 2009

Keywords

  • IR-68545
  • METIS-258350

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