Hydrophobic coatings are widely used in many areas from home to industry. However, the hydrophobicity can be easily degraded by adsorption of the atmospheric contaminations. In this study, a novel CeO₂/black TiO₂ hydrophobic coating with self-recovery capability is prepared using air plasma spraying without any chemical modification. The water contact angles (WCAs) of the coatings decreased after oleic acid contamination. Because of the presence of black TiO₂, the composite coating has the photodegradation property under irradiation of visible light, and the part of the black TiO₂ transforms to be superhydrophilic after irradiation for the generation of the surface oxygen vacancies. The oleic acid was decomposed and the WCAs changed depending on the volume percentage of the CeO₂. The coating exhibits hydrophilicity when the volume percentage of the CeO₂ is less than 60%, and hydrophobic when higher. After storage in a dark and clean environment, all the coatings can recover their hydrophobicity for the black TiO₂ that returned back to its origin state. It is believed that this hydrophobic self-cleaning ceramic coating should have potential in engineering applications.

中文翻译：

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空气等离子体喷涂制备的可见光活化自恢复疏水CeO ₂ /黑色TiO ₂涂层

从家庭到工业，疏水性涂料广泛用于许多领域。但是，疏水性很容易通过吸附大气污染物而降低。在这项研究中，使用没有任何化学修饰的空气等离子喷涂制备了具有自恢复能力的新型CeO ₂ /黑色TiO ₂疏水涂层。油酸污染后，涂料的水接触角（WCAs）降低。由于存在黑色TiO ₂，该复合涂层在可见光的照射下具有光降解性能，并且黑色TiO ₂的一部分具有光降解性能。辐射后转变为超亲水性，以产生表面氧空位。油酸分解，WCA随CeO ₂的体积百分比而变化。当CeO ₂的体积百分比小于60％时，涂层表现出亲水性，而当CeO ₂的体积百分比更高时，则表现出疏水性。在黑暗和清洁的环境中储存后，所有涂层都可以恢复黑色TiO ₂的疏水性，而黑色TiO ₂返回其原始状态。据信这种疏水性自清洁陶瓷涂层应在工程应用中具有潜力。