In this paper, SiO₂-TiO₂ composite particles were prepared by loading nano-TiO₂ onto the surfaces of amorphous SiO₂ microspheres, which were then modified with PDMS to obtain a SiO₂-TiO₂@PDMS ternary compound. The photocatalytic performance of SiO₂-TiO₂@PDMS and the wettability of the coated surface were tested and characterized. Moreover, the effect of microstructure and composition of SiO₂-TiO₂@PDMS on its properties was studied. The results showed that SiO₂-TiO₂@PDMS possessed a certain degree of photocatalytic activity and the coating was almost superhydrophobic. Furthermore, the wettability and adhesion to water droplets of the SiO₂-TiO₂@PDMS coating were affected by the heat-treatment temperature; the mechanism of the above phenomena was also analysed. Moreover, the as-prepared coating exhibited excellent repellent effects towards acid (pH = 2), alkaline (pH = 11), and organic dye droplets. A mechanically damaged coating maintained its liquid repellence, indicating that the good mechanical stability of the coating. The superhydrophobicity of the as-prepared coating did not decrease after UV irradiation for 8 h, illustrating that the as-prepared coating had a great UV irradiation resistance. In addition, the as-prepared coating was environmentally friendly and free of fluorides and is therefore suitable for practical applications.

本文通过将纳米TiO ₂负载在无定形SiO ₂微球表面上制备SiO ₂ -TiO ₂复合颗粒，然后将其用PDMS改性以获得SiO ₂ -TiO ₂ @PDMS三元化合物。测试并表征了SiO ₂ -TiO ₂ @PDMS的光催化性能和涂层表面的润湿性。此外，研究了SiO ₂ -TiO ₂ @PDMS的微观结构和组成对其性能的影响。结果表明，SiO ₂ -TiO ₂@PDMS具有一定程度的光催化活性，涂层几乎是超疏水的。此外，SiO ₂ -TiO ₂的润湿性和对水滴的粘附性@PDMS涂层受热处理温度的影响；还分析了上述现象的机理。此外，所制备的涂层对酸（pH = 2），碱（pH = 11）和有机染料滴具有优异的驱避作用。机械损坏的涂层保持其拒液性，表明涂层的良好机械稳定性。紫外线照射8小时后，制备的涂层的超疏水性没有降低，这表明制备的涂层具有很大的抗紫外线辐射性。另外，所制备的涂层是环境友好的并且不含氟化物，因此适用于实际应用。