1. Tunability of the Adhesion of Water Drops on a Superhydrophobic Paper Surface via Selective Plasma Etching.
- Author
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Balu, Balamurali, Jong Suk Kim, Breedveld, Victor, and Hess, Dennis W.
- Subjects
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PLASMA etching , *HYSTERESIS , *SURFACE chemistry , *CELLULOSE , *ADHESION , *ETCHING , *ELASTICITY - Abstract
We report the fabrication of a sticky superhydrophobic paper surface with extremely high contact angle hysteresis: advancing contact angle ∼150° (superhydrophobic) and receding contact angle ∼10° (superhydrophilic). In addition, we report the controlled tunability of the contact angle hysteresis from 149.8 ± 5.8° to 3.5 ± 1.1°, while maintaining superhydrophobicity, as defined through an advancing contact angle above 150°. The hysteresis was tuned through the controlled fabrication of nano-scale features on the paper fibers via selective plasma etching. The variations in contact angle hysteresis are attributed to a transition of the liquid–surface interaction from a Wenzel state to a Cassie state on the nano-scale, while maintaining a Cassie state on the micro-scale. Superhydrophobic cellulosic surfaces with tunable stickiness or adhesion have potential applications in the control of aqueous drop mobility and the transfer of drops on inexpensive, renewable substrates. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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