Anomalous wetting on a superhydrophobic graphite surface

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

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Abstract

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.

Original languageEnglish
Article number121601
JournalApplied Physics Letters
Volume100
Issue number12
DOIs
StatePublished - 19 Mar 2012

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