Journal
SURFACE & COATINGS TECHNOLOGY
Volume 374, Issue -, Pages 557-568Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2019.05.073
Keywords
Silicone rubber; Wenzel and Cassie-Baxter regimes; Ultra-water-repellent surface; Self-cleaning; Suspended contamination; Outdoor condition
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- K-Line Insulators Limited, Toronto, Canada
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Ultra-water-repellent silicone-based surfaces were produced to study their self-cleaning properties. First, we investigated the consistency of the micro-nano air pockets that are present between the surface asperities responsible for the formation of the Cassie-Baxter regime. We then performed a comprehensive series of self-cleaning experiments involving both suspended and non-suspended contaminants using various materials (e.g., kaolin, carbon black, silica, etc.) and contaminant-applying methods (e.g., dropwise, spraying, wet or dry contaminants). In this paper, the self-cleaning tests were arranged from the less severe, i.e., non-suspended contamination tests, to more severe, i.e., wet suspended contamination test, and ending with the most severe, i.e., dry suspended contamination test. Due to the ultra-low contact angle hysteresis, the produced surfaces showed favorable self-cleaning properties against the various types of contaminants and the different means of contaminant application. The produced surfaces retained their water repellency properties following application of the contaminants and after the cleaning of the surfaces, thus verifying the self-cleaning performance and resistance of the fabricated superhydrophobic silicone surfaces.
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