Facile fabrication of durable superhydrophobic SiO 2 /polyacrylate composite coatings with low nanoparticle filling
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Facile fabrication of durable superhydrophobic SiO2/polyacrylate composite coatings with low nanoparticle filling Yanfen Huang , Bin Chen, Zaosheng Lv, Fen Guo
Ó American Coatings Association 2020 Abstract This study aimed to prepare superhydrophobic coatings that could be used for practical applications. Nanocomposites of polyacrylate containing silica nanoparticles were prepared by dispersing silica sol in a polyacrylate solution. Superhydrophobicity was attainable for nanocomposite coatings with a filler percentage of only 15 wt%. Reducing the loading of silica nanoparticles not only minimized the costs but also simplified the preparation. The superhydrophobic coatings with water contact angle as high as 155.4° and contact angle hysteresis of 5.6° exhibited good selfcleaning property. The superhydrophobic nanocomposite coatings also displayed good mechanical properties and excellent thermal stabilities that favor indoor and outdoor applications. The superhydrophobic nanocomposite coatings can be used on various substrate surfaces, including glass plates, polymethyl methacrylate plates, polycarbonate plates, and aluminum sheets. Given their large-scale and low-cost fabrication, superhydrophobic coatings show great promise in practical applications in a broad range of fields. Keywords Superhydrophobic, Silica sol, Nanocomposites, Adhesion strength, Thermal stability
Introduction Superhydrophobicity, an important property for solid surfaces, has attracted considerable attention in recent years due to its substantial application prospects. The Y. Huang (&), B. Chen, Z. Lv, F. Guo Hubei Key Laboratory of Coal Conversion and New Carbon Material, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China e-mail: [email protected]
applications of superhydrophobic surfaces now expand to many fields, such as building materials,1,2 electronic devices,3,4 microfluidic devices,5,6 biomaterials,7,8 and oil/water separation.9–13 Superhydrophobicity is defined as possessing a water contact angle (WCA) above 150° and a sliding angle below 10°.14–19 Since Barthlott and Neinhuis found that the self-cleaning effect of the lotus leaf is related to its low surface energy and hierarchical structure,20,21 two approaches have been employed to fabricate superhydrophobic surfaces: One is to create a rough surface on a hydrophobic material, and the other is to modify a rough surface using materials with a low surface free energy.22,23 Diverse methods and superhydrophobic materials have been reported, but ensuring that the preparation method is inexpensive, fast, simple, feasible, and not restricted to special substrates remains challenging in practice. Poor mechanical properties are common and serious problems in superhydrophobic coatings that limit the practical applications of these materials. The organic–inorganic hybrid method is one of the most promising methods for fabricating superhydrophobic surfaces because of its low demand for equipment, simple operation, low cost, larg
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