TiO2-SiO2 monolithic glass formation from sol-gel
TiO2-SiO2 monolithic glass formation from sol-gel
复制标题
溶胶-凝胶法制备 TiO2-SiO2 单片玻璃
DOI：
10.1016/0022-3093(88)90038-5
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Yao Guoxing
中科院分区：
文献类型：
--
作者：
Yu Lirong;Yao Guoxing
This study demonstrates that hydrolysis should be carried out in a step manner in gel synthesis. The key to the increase in the amount of water added is the control of the hydrolysis rate of Ti(OC4H9)4. The hydrolysis of Si(OC2H5)4can be carried out at about 75°C. The amount of added water (γWI), which varied with TiO2content (in mol%), was about 64–88% of the total amount of added water. The hydrolysis reaction should be performed at room temperature while Ti(OC4H9)4is added. The total amount of added water (γW) is related to the amount of solvent (R). For example, if TiO2is 40mol%, γWwill vary from 3.2 to 8.0 whenRvaries from 0.8 to 2.0. The amount of added water was affected by the distribution of solvent in the metal alkoxides. The amount of added water can be increased whenRSi(OC2H5)4= 1,RTi(OC4H9)4> 1. The rate of rise in temperature of the thermolysis of the dried gel should be less than 10°C per hour, and the heat treatment temperatyre is related to the TiO2content (in mol%). Gel glasses without devitrification can only be obtained by thermolysis at 600°C from the gel with no less than 20 mol% TiO2.
