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Download fileLarge-Scale Spraying Fabrication of Robust Fluorine-Free Superhydrophobic Coatings Based on Dual-Sized Silica Particles for Effective Antipollution and Strong Buoyancy
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posted on 2021-05-03, 17:39 authored by Jixi Zhang, Ligui Zhang, Xiao GongWith the rapid development of bionic
science and manufacturing
technology, superhydrophobic surfaces have received extensive attention
and research. However, the cumbersome steps, high cost, fluorine pollution,
and poor durability greatly restrict its commercial promotion and
application. Here, a simple spraying method is used to construct wear-resistant
superhydrophobic coatings on various substrates such as glass, filter
paper, copper sheets, and polyethylene terephthalate films, using
an integrated fluorine-free suspension consisting of silica micropowder,
nanofumed silica, epoxy resin, and polydimethylsiloxane. The prepared
superhydrophobic coating can withstand 75 sandpaper abrasion cycles
and can still maintain good superhydrophobic performance after other
physical tests (e.g., hand kneading and tape peeling after knife scraping).
In addition, the coating is extremely water-repellent under harsh
conditions such as strong UV irradiation and extreme chemical corrosive
media. In the buoyancy test, the coated filter paper can bear 39 times
its own gravity. This water-repellent interface also has the ability
to self-clean in air and oil environments due to its ultralow adhesion
to water droplets. Thanks to its simplicity, cheapness, and environmental
friendliness, this superhydrophobic coating has promising applications
in the fields of construction, chemicals, transportation, and electronics.