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woai001

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[求助] 在线急等用溶胶凝胶法合成二氧化钛二氧化硅复合材料

亲们,本人刚接触用溶胶凝胶法合成复合材料,调研了这篇文献,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.
但是在加上的过程中出现乳白色沉淀,而不是像文献中报道的形成无色透明的溶胶。请教各位,我该怎么做呢,最主要 的是他们的配比是什么的,具体的操作过程是怎样的呢
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