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woai001銅蟲 (小有名氣)
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[求助]
在線急等用溶膠凝膠法合成二氧化鈦二氧化硅復(fù)合材料
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親們,本人剛接觸用溶膠凝膠法合成復(fù)合材料,調(diào)研了這篇文獻(xiàn),Preparation of the TiO2/SiO2 Composite Oxide. The nanometer particles of TiO2/SiO2 composite oxides were prepared by the sol-gel method according to the literature.17-20 Tetrabutyltitanium and tetraethoxysilane were selected as the source of Ti and Si, respectively. Tetraethoxysilane was dissolved in isopropyl alcohol, and then the solution was stirred continuously for 20 min. Tetrabutyltitanium was dripped into the solution. Distilled water was injected drop by drop until a transparent sol formed and gelled at room temperature. The molar ratio of Si and Ti was 1:4.6. Finally, calcinations were performed at 550 °C for 1 h, and nanometer-sized TiO2/SiO2 particles were obtained. 但是在加上的過程中出現(xiàn)乳白色沉淀,而不是像文獻(xiàn)中報(bào)道的形成無色透明的溶膠。請教各位,我該怎么做呢,最主要 的是他們的配比是什么的,具體的操作過程是怎樣的呢 |
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