Abstract
Translucent and polycrystalline TiO2 monolith was prepared by heating a gel at 500°C. Clear TiO2 gel as a precursor was formed through the controlled hydrolysis of a Ti-n-butoxide/cyclohexane solution in a vessel covered with a plastic film having pin-holes. Upon heating, the amorphous gel crystallized to anatase at 200°C and converted into rutile at 600°C. In the temperature range from room temperature to 600°C, a large volume change which may cause a crack in the gel occurred with decomposition of residual organic materials. Transparency of the gel was retained up to 550°C except in the decomposition temperature range of organic materials (160-330°C). The TiO2 monolith obtained from a crak-free gel after heating to 500°C at a rate of 20°C/h was a translucent porous material (apparent porosity: 42% and pore diameter: 7-30nm) and consisted of fine anatase grains.
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