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Nano Research 2021, 14(5): 1429-1434 https://doi.org/10.1007/s12274-020-3196-8
Research Article | Issue | Published: 19 November 2020

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

Show Author's Information Rui Wang1,§,  Feifei Wu1,§,  Fanfei Yu1,§,  Jie Zhu1,  Xuefeng Gao1,2( ),  Lei Jiang3
Functional Materials and Interfaces Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China
Key Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Keywords:
superhydrophobic, oblique nanowires, anti-vapor-penetration, microdrop self-transport
Topics:
NanostructuresSuperhydrophobicity
Cite this article:
Wang R, Wu F, Yu F, et al. Anti-vapor-penetration and condensate microdrop self-transport of superhydrophobic oblique nanowire surface under high subcooling. Nano Research, 2021, 14(5): 1429-1434. https://doi.org/10.1007/s12274-020-3196-8
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Abstract Full text Electronic supplementary material About this article

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-vapor-penetration 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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Electronic supplementary material
About this article

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

Show Author's information Rui Wang1,§, Feifei Wu1,§, Fanfei Yu1,§, Jie Zhu1, Xuefeng Gao1,2( ), Lei Jiang3
Functional Materials and Interfaces Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China
Key Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Abstract

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-vapor-penetration 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.

Keywords: superhydrophobic, oblique nanowires, anti-vapor-penetration, microdrop self-transport

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Publication history
Copyright
Acknowledgements

Publication history

Received: 10 September 2020
Revised: 12 October 2020
Accepted: 15 October 2020
Published: 19 November 2020
Issue date: May 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

Acknowledgements

This work was supported by the National Key R&D Program of China (No. 2017YFB0406100), the National Natural Science Foundation of China (No. 21573276), and Natural Science Foundation of Jiangsu Province (Nos. BK20170007 and BK20170425).

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