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Robust superhydrophobic wood obtained by spraying silicone nanoparticles


Chu, Zonglin; Seeger, Stefan (2015). Robust superhydrophobic wood obtained by spraying silicone nanoparticles. RSC Advances, 5(28):21999-22004.

Abstract

Silica nanoparticles, usually synthesized via St¨ober reactions in the presence of a suitable amount of an ammonia catalyst, are frequently used in the fabrication of self-cleaning surfaces. However, to achieve superhydrophobicity, the nanosilica-modified surfaces need to be further functionalized with lowsurface-energy materials. Here, we report the preparation of polymethylsiloxane nanoparticles in a facile way, i.e., the hydrolysis of trichloromethylsilane in toluene under ambient conditions in the absence of a catalyst. The resulting gel-like solution can be applied to substrate surfaces by the convenient method of spraying. Wood slides were used as substrates, and the spray-coated wood without any further surface elaboration became extremely superhydrophobic. Notably, it was observed that the superhydrophobicity of the coated wood is mechanically stable against repeated finger rubbing because of the macroscale and microscale roughness of the wood surfaces that serve as a barrier against mechanical damage.

Abstract

Silica nanoparticles, usually synthesized via St¨ober reactions in the presence of a suitable amount of an ammonia catalyst, are frequently used in the fabrication of self-cleaning surfaces. However, to achieve superhydrophobicity, the nanosilica-modified surfaces need to be further functionalized with lowsurface-energy materials. Here, we report the preparation of polymethylsiloxane nanoparticles in a facile way, i.e., the hydrolysis of trichloromethylsilane in toluene under ambient conditions in the absence of a catalyst. The resulting gel-like solution can be applied to substrate surfaces by the convenient method of spraying. Wood slides were used as substrates, and the spray-coated wood without any further surface elaboration became extremely superhydrophobic. Notably, it was observed that the superhydrophobicity of the coated wood is mechanically stable against repeated finger rubbing because of the macroscale and microscale roughness of the wood surfaces that serve as a barrier against mechanical damage.

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18 citations in Web of Science®
18 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:English
Date:2015
Deposited On:18 Dec 2015 15:29
Last Modified:08 Dec 2017 15:53
Publisher:Royal Society of Chemistry
ISSN:2046-2069
Funders:University of Zurich, Swiss National Science Foundation (SNSF)
Publisher DOI:https://doi.org/10.1039/c4ra13794a

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