Volume 88, Number 2, October 2009
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||04 November 2009|
Fall and rise of small droplets on rough hydrophobic substrates
Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universität Bochum Stiepeler Strasse 129, 44801 Bochum, Germany, EU
2 Max-Planck Institut für Eisenforschung - Max-Planck Str. 1, 40237 Düsseldorf, Germany, EU
Accepted: 1 October 2009
Liquid droplets on patterned hydrophobic substrates are typically observed either in the Wenzel or the Cassie state. Here we show that for droplets of comparable size to the roughness scale an additional local equilibrium state exists, where the droplet is immersed in the texture, but not yet contacts the bottom grooves. Upon evaporation, a droplet in this state enters the Cassie state, opening the possibility of a qualitatively new self-cleaning mechanism. The effect is of generic character and is expected to occur in any hydrophobic capillary wetting situation where a spherical liquid reservoir is involved.
PACS: 68.08.Bc – Wetting / 68.35.Ct – Interface structure and roughness / 47.55.D- – Droplets and bubbles
© EPLA, 2009
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