Electrowetting control of Cassie-to-Wenzel Transitions in superhydrophobic carbon nanotube-based nanocomposites

Han, Zhao Jun, Tay, Bengkang, Tan, Cherming, Shakerzadeh, Mazier, & Ostrikov, Kostya (2009) Electrowetting control of Cassie-to-Wenzel Transitions in superhydrophobic carbon nanotube-based nanocomposites. ACS Nano, 3(10), pp. 3031-3036.

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Abstract

The possibility of effective control of the wetting properties of a nanostructured surface consisting of arrays of amorphous carbon nanoparticles capped on carbon nanotubes using the electrowetting technique is demonstrated. By analyzing the electrowetting curves with an equivalent circuit model of the solid/liquid interface, the long-standing problem of control and monitoring of the transition between the "slippy" Cassie state and the "sticky" Wenzel states is resolved. The unique structural properties of the custom-designed nanocomposites with precisely tailored surface energy without using any commonly utilized low-surface-energy (e.g., polymer) conformal coatings enable easy identification of the occurrence of such transition from the optical contrast on the nanostructured surfaces. This approach to precise control of the wetting mode transitions is generic and has an outstanding potential to enable the stable superhydrophobic capability of nanostructured surfaces for numerous applications, such as low-friction microfluidics and self-cleaning.

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76 citations in Web of Science®

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ID Code: 73897
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Carbon nanotube, Cassie-to-Wenzel transition, Electrowetting, Nanocomposites, Superhydrophobic
DOI: 10.1021/nn900846p
ISSN: 1936-0851
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 14 Jul 2014 23:54
Last Modified: 16 Jul 2014 01:51

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