Journal
APPLIED SURFACE SCIENCE
Volume 257, Issue 24, Pages 10910-10916Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2011.07.140
Keywords
Superhydrophobic surface; Rapid; Electrochemical; Copper
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Funding
- National Science Foundation of China [90923022]
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Hierarchical micrometer-nanometer-scale binary rough structures were fabricated on copper substrates by electrochemical machining in a neutral NaCl electrolyte. The rough structures are composed of the micrometer scale potato-like structures and the nanometer scale cube-like structures. After modified by the fluoroalkylsilane, the copper surfaces reached superhydrophobicity with a water contact angle of 164.3 degrees and a water tilting angle less than 9 degrees. This method has a high processing efficiency which can take just 3 s to fabricate the roughness required by the superhydrophobic surface. The effect of the processing time on wettability of the copper surfaces was investigated in this paper. The possible mechanism of the formation of the hierarchical roughness was also proposed, and the wettability of the copper surfaces was discussed on the basis of the Cassie-Baxter theory. (C) 2011 Elsevier B.V. All rights reserved.
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