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19 Mar 2012

Volume 100, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 100, 121101 (2012); http://dx.doi.org/10.1063/1.3693413 (4 pages)

Jolly Xavier, Raktim Dasgupta, Sunita Ahlawat, Joby Joseph, and Pradeep Kumar Gupta
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Anomalous wetting on a superhydrophobic graphite surface

Siang-Jie Hong, Yueh-Feng Li, Mu-Jou Hsiao, Yu-Jane Sheng, and Heng-Kwong Tsao

Appl. Phys. Lett. 100, 121601 (2012); http://dx.doi.org/10.1063/1.3697831 (4 pages)

Online Publication Date: 22 March 2012

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A superhydrophobic graphite surface has been fabricated through two facile physical steps, peeling and ultrasonicating. Peeling yields micron-scale roughening, and thus a highly hydrophobic surface is obtained. Further ultrasonicating results in a superhydrophobic surface with nanostructure embedded in microstructure. The nanostructure leads to networklike pores on the superhydrophobic film and convective Ostwald ripening is observed. Owing to their distinct resistance to liquid imbibition, contact angle hysteresis on hydrophobic and superhydrophobic surfaces is fundamentally different. Moreover, the adhesive force on a superhydrophobic surface grows with the contact time, and such aging effect is absent on hydrophobic graphite surface.
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81.05.uf Graphite
68.03.Cd Surface tension and related phenomena
68.08.Bc Wetting
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