Abstract
Water repellent SiO2 particulate coatings were prepared by a one-step introduction of vinyl groups on the coating surface. Rough surface structure and low surface energy could be directly obtained. Vinyl functionalized SiO2 (vinyl-SiO2) spheres with average diameter of 500 nm were first synthesized by a sol–gel method in aqueous solution using vinyltriethoxysilane as the precursor. The multilayer SiO2 coating fabricated by dip-coating method was highly hydrophobic with a water contact angle of 145.7° ± 2.3°. The superhydrophobic SiO2 coating with a water contact angle up to 158° ± 1.7° was prepared by spraying an alcohol mixture suspension of the vinyl-SiO2 spheres on the glass substrate. In addition, the superhydrophobic SiO2 coating demonstrated good stability under the acidic condition. However, it lost its hydrophobicity above 200°C because of the oxidation and degradation of vinyl groups.
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Acknowledgments
The authors are grateful for the financial supports by the Natural Science Foundation of China (Grant 21076044), the National Basic Research Program of China (973 Program) (Grant 2012CB215306), and the Scientific Research Foundation of Graduate School of Southeast University (Grant YBJJ1223).
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Shang, Q., Wang, M., Liu, H. et al. Facile fabrication of water repellent coatings from vinyl functionalized SiO2 spheres. J Coat Technol Res 10, 465–473 (2013). https://doi.org/10.1007/s11998-012-9465-z
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DOI: https://doi.org/10.1007/s11998-012-9465-z