Superhydrophobic Surfaces: Nanograssed Micropyramidal Architectures for Continuous Dropwise Condensation (Adv. Funct. Mater. 24/2011)

Authors

  • Xuemei Chen,

    1. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China
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  • Jun Wu,

    1. Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China
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  • Ruiyuan Ma,

    1. Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China
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  • Meng Hua,

    1. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China
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  • Nikhil Koratkar,

    Corresponding author
    1. Department of Mechanical Engineering and Department of Materials, Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
    • Department of Mechanical Engineering and Department of Materials, Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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  • Shuhuai Yao,

    Corresponding author
    1. Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China
    • Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China
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  • Zuankai Wang

    Corresponding author
    1. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China
    • Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China.
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Abstract

original image

A surface with nanograssed micropyramidal arrays that allows for enhanced drop nucleation and departure simultaneously is successfully developed by harnessing the hierarchical roughness and heterogeneous wetting. On page 4617, Nikhil Koratkar, Shuhuai Yao, Zuankai Wang, and co-workers show that the surface yields a global superhydrophobity as well as local wettable patches (smooth structure). Synergistic co-operation between the hierarchical structure contributes directly to a continuous process of nucleation, coalescence, departure, and re-nucleation, enabling sustained drop-wise condensation over prolonged periods.

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