Mechanism Investigation of Influence of HPC on the Microstructure ofTiO_2 Films

Sol-gel-derived TiO2 colloid films were prepared with various amount of hydroxypropy-lcellulose (HPC) as additive. The function mechanism of HPC on the microstructure of titania films was studied. FRIR analysis shows that HPC anchors on the surface of titania colloid. The action between the polymers decides the distribution of titania colloid in the solution. Scanning electrical microscope (SEM) and transmitting electrical microscope (TEM) analysies show that when the concentration of HPC is 4.5×10-3g/g, the adsorption of HPC on titania colloid reaches its fitting amount, the titania colloid disperses well in the solution and the particle size of titania is smallest.