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.
Item Type:	Article
Copyright:	© 2009 Springer
Faculty:	Science and Technology (TNW)
Research Group:	Membrane Science and Technology (MST) Physics of Fluids (POF)
Link to this item:	http://purl.utwente.nl/publications/68545
Official URL:	http://dx.doi.org/10.1140/epje/i2009-10489-3
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