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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Peters, A.M., Pirat, C., Sbragaglia, M. et al. Cassie-Baxter to Wenzel state wetting transition: Scaling of the front velocity. Eur. Phys. J. E 29, 391–397 (2009). https://doi.org/10.1140/epje/i2009-10489-3
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DOI: https://doi.org/10.1140/epje/i2009-10489-3