Electrowetting-Induced Dewetting Transitions on Superhydrophobic Surfaces

Niru Kumari, Birck Nanotechnology Center, Purdue University
Suresh V. Garimella, Birck Nanotechnology Center, Purdue University

Abstract

We develop and demonstrate the use of electrowetting to achieve the dewetting (Wenzel-to-Cassie transition) of superhydrophobic surfaces. We effect this transition by means of an opposing flat plate and a three-electrode system; the liquid droplet is completely pulled out of its wetted Wenzel state upon the application of a suitable voltage. We also experimentally quantify the dissipative forces preventing the dewetting transition. The energy associated with these nonconservative forces is comparable to the interfacial energies.

Discipline(s)

Nanoscience and Nanotechnology