Of Sio <sub> 2 </ Sub>-of Tio <sub> 2 </ Sub> Hydrophilic Films And Hydrophilic Properties Of Study

TiO2 film has excellent photocatalytic and photoinduction superdrophilic characteristics and solves the problem of TiO2 power's recycling for further utilization. It has broad application prospects in fields of catalytic degradation of organic matter in the light, desensitized solar cells, antifogging and self-cleaning. While only UV-light can induce TiO2 film's photocatalytic and superdrophilic characteristics, so it is quite important to raise the utilization rate of visible light and to maintain hydrophilic stability of TiO2 film.SiO2 is a type of stable water-impounding material, because SiO2 surface can absorbe much more water and form symmetric hydroxyl groups with Si atoms. Considering SiO2's water-impounding property, we chose it to dope with TiO2 film, our study include three parts:First, we prepared SiO2TiO2 mixed gel using butyl titanate and tetraethy orthosilicate as premedicants, and then prepared SiO2-TiO2 film by gel-sol methed. Second, we compared the hydrophility of SiO2-TiO2 films prepared by muffle furnace with those prepared by microware oven. Finally, we studied the stability SiO2-TiO2 mixed gel, for research of gelatinization is the basis to prepare TiO2 film by gel-sol method. Through our study, experiment results show that:(1)When the rate of VTEOS:VTBOT is 0.75, SiO2-TiO2 film has excellent hydrophility in visible light. UV-visible specturm shows that compare with TiO2 film, SiO2-TiO2 film has more absorbance intensity.(2)The hydrophility of SiO2-TiO2 films prepared by muffle furnace is better than those prepared by microwave oven, SiO2-TiO2 films prepared by microwave heating come off easy and hydrophilic group of SiO2-TiO2 films prepared by microwave heating is destroyed during heating.(3)The best pH value of SiO2-TiO2 stable mixed gel is 3.5 and keeping temperature is 10℃. Under that parameter, the time of SiO2-TiO2 mixed gelatinization is 7 days.