Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3697831
Keywords
adhesion; contact angle; graphite; hydrophobicity; ultrasonic applications; wetting
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Funding
- National Science Council of Taiwan
- Industrial Technology Research Institute of Taiwan
- Direct For Mathematical & Physical Scien
- Division Of Physics [1314463, GRANTS:13773411] Funding Source: National Science Foundation
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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. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3697831]
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