Abstract
Superhydrophobic surfaces possess low mechanical strength, and can be easily contaminated by fluids with low surface tension, such as oil; this hinders their practical applications. In this study, fluorinated epoxy was prepared through the thiol-ene click reaction at first. The superhydrophobic surface with high oil-repellency was prepared by the addition of unmodified nano-SiO2 and micron-SiO2 to the fluorinated epoxy. The effect of the ratio of micro- and nano-silica particles on the morphology and wettability of the coating was investigated. It was shown that a re-entrant structure appears and FEP-S coating has good liquid repellency when the amounts of nano-SiO2 and micro-SiO2 are equal. The contact angles of the FEP-S coating (coating with the best liquid repellent performance) for water, glycerol, ethylene glycol, and diiodomethane were 158.6° ± 1.1°, 152.4° ± 0.9°, 153.4° ± 1.3°, and 140.7° ± 0.9°, respectively. In addition, the superhydrophobic coatings possess excellent mechanical and chemical durability, excellent performance in self-cleaning, corrosion resistance, and anti-icing properties. The preparation method of superhydrophobic coating is relatively simple; therefore, it has a wide range of applications and can also be applied to various substrates.
Highlights
The superhydrophobic surface is a surface where the water contact angle is greater than 150◦ and the contact angle hysteresis is lower than 10◦
Extensive literature is available related to the preparation of superhydrophobic surfaces
Small flakes of the coating are detached at intersections, and less than 5% of the area is affected
Summary
The superhydrophobic surface is a surface where the water contact angle is greater than 150◦ and the contact angle hysteresis is lower than 10◦. Superhydrophobic surfaces have wide applications in self-cleaning [1], antifouling [2], anti-icing [3,4], anti-corrosion [5,6], oil transfer, and oil-water separation [7,8]. Extensive literature is available related to the preparation of superhydrophobic surfaces. In practical applications, the superhydrophobic surfaces inevitably encounter some problems. After contact with organic liquids with low surface tension, and even fingerprints, the surface will lose their superhydrophobicity. Superhydrophobic surfaces which can repel both water and oil have more practical applications as compared with ordinary superhydrophobic surfaces
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