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


Peters, A.M. and Pirat, C. and Sbragaglia, M. and Borkent, B.M. and Wessling, M. and Lohse, D. and Lammertink, R.G.H. (2009) Cassie-Baxter to Wenzel state wetting transition: Scaling of the front velocity. European Physical Journal E: Soft Matter and Biological Physics, 29 (4). pp. 391-397. ISSN 1292-8941

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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.
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Copyright:© 2009 Springer
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