Cassie-Baxter to Wenzel state wetting transition: scaling of the front velocity.
Eur Phys J E Soft Matter
; 29(4): 391-7, 2009 Aug.
Article
em En
| MEDLINE
| ID: mdl-19669178
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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MEDLINE
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En
Ano de publicação:
2009
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Article