Details

Autor(en) / Beteiligte

• Peters, A. M.
• Pirat, C.
• Sbragaglia, M.
• Borkent, B. M.
• Wessling, M.
• Lohse, D.
• Lammertink, R. G. H.

Titel

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

Ist Teil von

• The European physical journal. E, Soft matter and biological physics, 2009-08, Vol.29 (4), p.391-397

Ort / Verlag

Berlin/Heidelberg: Springer-Verlag

Erscheinungsjahr

2009

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.