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When superhydrophobic coatings are icephobic: Role of surface topology

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journal contribution
posted on 11.12.2018, 16:27 authored by Xinghua Wu, Vadim SilberschmidtVadim Silberschmidt, Zhong-Ting Hu, Zhong Chen
Among different types of anti-icing coatings, superhydrophobic coatings have attracted considerable attention due to their water repellency and low heat-transfer rate. However, condensation on superhydrophobic surfaces at low temperatures usually causes an increase in ice adhesion because of the induced wetting of micro- and nanostructures. By tuning the weight ratio of surface-modified nanoparticles to unmodified ones, five superhydrophobic coatings with different structural features at the microscale were developed. Ice-adhesion strength and ice-nucleation temperature were studied, together with the effect of moisture condensation on ice adhesion. It was found that the ice-adhesion strength and icing temperature of these coatings do not necessarily follow the same order among these surfaces because of different mechanisms involved. Surface roughness is inadequate to describe the necessary surface features that critically affect the anti-icing behavior of the coatings. Detailed topology/geometry has to be considered when designing icephobic coatings. Superhydrophobic coatings can be adopted for icephobic applications once the surface topology is carefully designed.

Funding

Financial support from A*STAR Science and Engineering Research Council (Grant 1528000048) of the Singapore Government is gratefully acknowledged.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Surface and Coatings Technology

Volume

358

Pages

207 - 214

Citation

WU, X. ... et al, 2018. When superhydrophobic coatings are icephobic: Role of surface topology. Surface and Coatings Technology, 358, pp.207-214.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Surface and Coatings Technology and the definitive published version is available at https://doi.org/10.1016/j.surfcoat.2018.11.039.

Acceptance date

13/11/2018

Publication date

2018-11-14

ISSN

0257-8972

Language

en