Hybrid Hydrophilic–Hydrophobic [email protected]2-Coated Copper Mesh for Efficient Water Harvesting

  • Xuelian Gou
    Xuelian Gou
    Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, 368 Friendship Avenue, Wuhan 430000, People’s Republic of China
    State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 18 Tianshui Middle Road, Lanzhou 730000, People’s Republic of China
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  •  and 
  • Zhiguang Guo*
    Zhiguang Guo
    Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, 368 Friendship Avenue, Wuhan 430000, People’s Republic of China
    State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 18 Tianshui Middle Road, Lanzhou 730000, People’s Republic of China
    *E-mail: [email protected], Tel: 0086-931-4968105, Fax: 0086-931-8277088.
    More by Zhiguang Guo
Cite this: Langmuir 2020, 36, 1, 64–73
Publication Date (Web):December 11, 2019
https://doi.org/10.1021/acs.langmuir.9b03224
Copyright © 2019 American Chemical Society
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Abstract

Fresh water scarcity has been a worldwide problem to be solved urgently. Inspired by the outstanding hydrophobic–hydrophilic patterns on the back of Namib desert beetles, hierarchical [email protected]2-coated surface with alternating hydrophilic–hydrophobic chemistry patterns were fabricated utilizing the photocatalysis of titanium dioxide through ultraviolet irradiation. The results indicated that the as-prepared hybrid dual-coated copper mesh enhanced the fog-collection efficiency compared with the uniformly superhydrophobic or superhydrophilic surface. This enhancement can be regulated by controlling the deposition cycle times of TiO2 multilayers on CuO and UV irradiation time. The best water harvesting behavior was determined at the deposition cycle times of 10 times and UV irradiation time of 4 h. This work findings offer new insights into the fabrication of hybrid hydrophilic–hydrophobic surfaces for highly efficient water harvesting.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.langmuir.9b03224.

  • Water and oil contact angles and SEM images on Cu(OH)2 surface, reaction mechanism of deposition process; SEM images of sample-2 before and after calcination; XPS spectra of CuO-coated surface; XPS spectra of sample-3; time-resolved snapshots of water droplet on sample-3; SEM images and water contact angle and rolling angles and EDS spectrum on HB sample-3; EDS spectra of CuO-coated surface before and after UV irradiation for 12 h (PDF)

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