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Bioinspired hierarchical copper oxide surfaces for rapid dropwise condensation

Abstract

Patterned copper oxide (CuO) microprotrusions have been developed by combining facile wet-chemical oxidization, photolithography technique and e-beam evaporation processes. The CuO microprotrusion was constructed by aligned CuO nanowhiskers, forming specific hierarchical structures. By adjusting the microfeatures of photoresist and oxidization parameters, the geometry of the CuO microprotrusion can be finely tuned ranging from 15 to 25 μm, quite similar to that of natural lotus leaf. The investigation on the surface wettability indicated that after fluorosilane treatment, the patterned surface presents remarkable superhydrophobic performance with contact angles over 160º. The in-situ water condensation performance was tested and found highly dependent on the surface feature. The spontaneous removal of condensate droplets without the apparance of flooding can be realized when the microprotrusion has a diameter of ~15 µm and endowed cavity of ~1.5 µm. Surface mapping could further verify the correlation of surface features with the nucleation, growth and departure of condensate water droplet. This bio-inspired condensate surface can find many potential applications in self-cleaning, anti-fogging, water harvesting and heat transfer-related fields.

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Publication details

The article was received on 11 Jun 2017, accepted on 08 Sep 2017 and first published on 08 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA05087A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Bioinspired hierarchical copper oxide surfaces for rapid dropwise condensation

    S. Wang, M. Liu, Y. Feng, Y. Bu, S. H. Huynh, T. W. Ng, F. Gu, A. Yu and X. Jiang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA05087A

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