Investigation of the effects of surface water film and hierarchical solid texture on the hydrophilicity of ceramics surface

利用不同的二氧化钛样品和探针显微镜研究了表面水膜和层状固体织构对高亲水性表面的影响。当紫外光照射到多晶金红石陶瓷表面时，摩擦力呈现先增大后减小的趋势。当金红石表面的水接触角达到下限时，摩擦力逐渐增大。摩擦力的增加归因于表面有机污染物的分解，随后摩擦力的减小和逐渐增加归因于水的吸附。由测力曲线推算出水层厚度为2.3 nm。此外，板蓝石-杂多酸杂化薄膜具有良好的光诱导亲水速率和亲水性的可持续性。从固体表面亲水点的角度讨论了这些性质的机理。

Effects of surface water film and hierarchical solid texture on the highly hydrophilic surface was investigated using various TiO2 samples and probe microscopy. When UV was irradiated onto the surface of polycrystalline rutile ceramics, the friction force first increased and then decreased. Once the water contact angle of the rutile surface reached the lower limit, the friction force increased gradually. Increased friction force was attributable to decomposition of the surface organic contaminant and subsequent friction force decrease and gradual increase are attributed to water adsorption. From the force curve measurement, the thickness of water layer was estimated as 2. 3 nm separation. Moreover, an excellent photoinduced hydrophilicizing rate and the sustainability of hydrophilicity were obtained from the brookite-heteropolyacid hybrid films. The mechanism of these properties was discussed from the viewpoint of hydrophilic points in the solid surface.