Research Article

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2021, 14(5): 1429–1434

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https://doi.org/10.1007/s12274-020-3196-8

Anti-vapor-penetration and condensate microdrop self-transport of superhydrophobic oblique nanowire surface under high subcooling

Rui Wang1,§, Feifei Wu1,§, Fanfei Yu1,§, Jie Zhu1, Xuefeng Gao1,2 (✉), and Lei Jiang3

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1 Functional Materials and Interfaces Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
2 School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China
3 Key Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
§ Rui Wang, Feifei Wu, and Fanfei Yu contributed equally to this work.

Keywords: superhydrophobic, oblique nanowires, anti-vapor-penetration, microdrop self-transport
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It is well-known that microscale gaps or defects are ubiquitous and can be penetrated by vapor, resulting in the failure of superhydrophobic effect and undesired condensate flooding under high subcooling. Here, we propose and demonstrate that such problem can be solved by the oblique arrangement of nanowires. Such a structure has been demonstrated to own anti-vaporpenetration and microdrop self-transport functions under high subcooling, unaffected by the microscale gaps. This is because vapor molecules can be intercepted by oblique nanowires and preferentially nucleate at near-surface locations, avoiding the penetration of vapor into the microscale gaps. As-formed microdrops can suspend upon the nanowires and have low solid-liquid adhesion. Besides, oblique nanowires can generate asymmetric surface tension and microdrop coalescence can release driving energy, both of which facilitate the microdrop self-removal via sweeping and jumping ways. This new design idea helps develop more advanced condensation mass and heat transfer interfaces.
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Anti-vapor-penetration and condensate microdrop self-transport of superhydrophobic oblique nanowire surface under high subcooling. Nano Res. 2021, 14(5): 1429–1434 https://doi.org/10.1007/s12274-020-3196-8

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