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Issue 7, 2016
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Texture and wettability of metallic lotus leaves

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Abstract

Superhydrophobic surfaces with the self-cleaning behavior of lotus leaves are sought for drag reduction and phase change heat transfer applications. These superrepellent surfaces have traditionally been fabricated by random or deterministic texturing of a hydrophobic material. Recently, superrepellent surfaces have also been made from hydrophilic materials, by deterministic texturing using photolithography, without low-surface energy coating. Here, we show that hydrophilic materials can also be made superrepellent to water by chemical texturing, a stochastic rather than deterministic process. These metallic surfaces are the first analog of lotus leaves, in terms of wettability, texture and repellency. A mechanistic model is also proposed to describe the influence of multiple tiers of roughness on wettability and repellency. This demonstrated ability to make hydrophilic materials superrepellent without deterministic structuring or additional coatings opens the way to large scale and robust manufacturing of superrepellent surfaces.

Graphical abstract: Texture and wettability of metallic lotus leaves

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Supplementary files

Article information


Submitted
20 Jun 2015
Accepted
19 Oct 2015
First published
28 Oct 2015

Nanoscale, 2016,8, 3982-3990
Article type
Paper
Author version available

Texture and wettability of metallic lotus leaves

C. Frankiewicz and D. Attinger, Nanoscale, 2016, 8, 3982
DOI: 10.1039/C5NR04098A

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