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Phys Rev Lett. 2009 Oct 23;103(17):174502. Epub 2009 Oct 21.

Restoring superhydrophobicity of lotus leaves with vibration-induced dewetting.

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1
Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, USA.

Abstract

A lotus leaf retains water repellency after repeated condensation in nature but becomes sticky to water drops after condensation on a fixed cold plate. Our experiments show that mechanical vibration can be used to overcome the energy barrier for transition from the sticky Wenzel state to the nonsticking Cassie state, and the threshold for the dewetting transition follows a scaling law comparing the kinetic energy imparted to the drop with the work of adhesion. The vibration-induced Wenzel to Cassie transition can be used to achieve antidew superhydrophobicity.

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