Water condensation on ultrahydrophobic flexible micro pillar surface
Ecole Supérieure de Physique et Chimie Industrielle, Laboratoire de Physique et Mécanique des Milieux Hétérogènes - 10, rue Vauquelin, 75231 Paris Cedex 05, France
Received: 26 January 2016
Accepted: 10 May 2016
We investigated the growth dynamics of water drops in controlled condensation on ultrahydrophobic geometrically patterned polydimethylsiloxane (PDMS) cylindrical micro pillars. At the beginning, the condensed drops size is comparable to the pattern dimensions. The interesting phenomenon we observe is that, as the condensation progresses, water drops between the pillars become unstable and enforced to grow in the upward direction along the pillars surface. The capillary force of these drops is of the order of and acts on neighboring pillars. That results into bending of the pillars. Pillars bending enhances the condensation and favors the most energetically stable Wenzel state.
PACS: 68.03.Cd – Surface tension and related phenomena / 68.08.Bc – Wetting / 64.60.Q- – Nucleation
© EPLA, 2016