将二氧化硅溶胶与自制的二氧化钛溶胶按照一定的质量比混合,搅拌均匀后喷涂到洁净的玻璃表面上,在500℃下热处理30 min得到了透明二氧化钛涂层.采用XRD和AFM分析了二氧化钛涂层的晶相结构和表面形貌,将涂层暴露在太阳光或者紫外灯下研究它们的光催化与亲水性关系.研究结果表明:添加质量分数为20%～30%的SiO2到TiO2溶胶中制备的二氧化钛涂层能有效地降低玻璃表面水滴的接触角,同时,SiO2添加质量分数为20%～30%时显示优良的光催化性能.由分析结果可知,二氧化钛涂层的光催化性能与亲水性呈现相关性,它们共同作用产生自清洁效果.
Titania (TiO2)sol was prepared using TiOSO4.Silica sol was added to TiO2 sol with a certain ratio.TiO2 transparent coatings on glass were obtained by spray-coating technique and heat-treated at 500℃for 30 min.The crystal structure and surface morphology of the coating were investigated by XRD and AFM.Their hydrophilic and photo-catalytic behavior ender exposure to sunlight or ultraviolet illumination were then studied.It is found that the addition of 20～30 wt% SiO2 to TiO2 is effective for reducing the contact angle of water.The optimum photo-catalytic character can be acquired by adding 10～30 wt%SiO2 to the TiO2 coating.According to the results,photo-catalytic activity is closely related to hydrophilicity,the two factors act together and thus increase the self-cleaning effect.
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