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Extreme resistance of superhydrophobic surfaces to impalement: reversible electrowetting related to the impacting/bouncing drop test

journal contribution
posted on 2023-05-18, 09:23 authored by Brunet, P, Lapierre, F, Thomy, V, Coffinier, Y, Boukherroub, R
The paper reports on the comparison of the wetting properties of superhydrophobic silicon nanowires (NWs), using drop impact impalement and electrowetting (EW) experiments. A correlation between the resistance to impalement on both EW and drop impact is shown. From the results, it is evident that when increasing the length and density of NWs (i) the thresholds for drop impact and EW irreversibility increase and (ii) the contact-angle hysteresis after impalement decreases. This suggests that the structure of the NW network could allow for partial impalement, hence preserving the reversibility, and that EW acts the same way as an external pressure. The most robust of our surfaces shows a threshold to impalement higher than 35 kPa, while most of the superhydrophobic surfaces tested so far have impalement thresholds smaller than 10 kPa.

History

Publication title

Langmuir

Volume

24

Issue

19

Pagination

11203-11208

ISSN

0743-7463

Department/School

School of Natural Sciences

Publisher

American Chemical Society

Place of publication

1155 16Th St, Nw, Washington, USA, Dc, 20036

Rights statement

Copyright 2008 American Chemical Society

Repository Status

  • Restricted

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