Abstract: TiO2/SiO2 composite film with self-cleaning property has been prepared using nanosize TiO2 particles produced by hydrothermal method and SiO2 polymeric particles by dip-coating technique. Effect of the volume fraction of SiO2 has been investigated on the surface morphology，visible light transmittance，photo-induced hydrophilicity and self-cleaning property of the composite film. As the volume fraction of SiO2 is increased，surface roughness，visible light transmittance，photo-induced hydrophilicity and self-cleaning property of the film show a similarity law over the SiO2 fraction，namely，when the volume fraction of SiO2 is about 25%，the above properties of the film reach a maximum or a minimum. With SiO2 volume fraction of 25%，the film can still show superhydrophilicity after having been kept outdoors for 28 days.

Key words: TiO2/SiO2 composite film, self-cleaning, roughness, light transmittance

摘要： 利用热陈化法得到的纳米TiO2粒子及SiO2聚合物胶粒通过浸渍-提拉技术制备了具有自清洁功能的TiO2/SiO2复合薄膜。考察了SiO2的复合比例对薄膜的表面形貌、透光率、光致亲水及自清洁性能的影响。随着SiO2复合体积分数的增大，薄膜的表面粗糙度、可见光透过率、光致亲水及自清洁性能显示了相似的变化规律。即在V（SiO2）= 25%左右时，薄膜的各项特性或性能达到最大值或最小值。该薄膜在室外放置28天后，仍能显示超亲水性能。

关键词: TiO2/SiO2复合薄膜, 自清洁, 粗糙度, 透光率