Journal
APPLIED SURFACE SCIENCE
Volume 436, Issue -, Pages 950-956Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.12.112
Keywords
Cu micro-cone array; Chemical grafting; Hierarchical structure; Intergranular corrosion; Superhydrophobicity
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Funding
- National Basic Research Program of China [973 Program] [2015CB057200]
- National Center for Advanced Packing Co., Ltd.
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In this paper, a superhydrophobic surface with hierarchical structure was fabricated by chemical deposition of Cu micro-cones array, followed by chemical grafting of poly(methyl methacrylate) (PMMA). Water contact measurements give contact angle of 131.0. on these surfaces after PMMA grafting of 2 min and 165.2. after 6 min. The superhydrophobicity results from two factors: (1) the hierarchical structure due to Cu micro-cones array and the second level structure caused by intergranular corrosion during grafting of PMMA (confirmed by the scanning electron microscopy) and (2) the chemical modification of a low surface energy PMMA layer (confirmed by Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy). In the chemical grafting process, the spontaneous reduction of nitrobenzene diazonium (NBD) tetrafluoroborate not only causes the corrosion of the Cu surface that leads to a hierarchical structure, but also initiates the polymerization of methyl methacrylate (MMA) monomers and thus the low free energy surface. Such a robust approach to fabricate the hierarchical structured surface with superhydrophobicity is expected to have practical application in anti-corrosion industry. (C) 2017 Elsevier B.V. All rights reserved.
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