N,N-二甲基甲酰胺存在下块状TiO_2凝胶的制备

Preparation of monolithic TiO_2 gel in the presence of N, N-dimethylformamide

在 Ｎ，Ｎ－二甲基甲酰胺（ＤＭＦ）存在下，研究了钛酸丁酯的水解缩聚过程，考察了酸及 ＤＭＦ用量对水解速率的影响。结果表明，随酸和 ＤＭＦ用量的增加，胶凝时间变长。通过 ＴＧ－ＤＴＡ的测定和Ｘ射线衍射分析，表明ＴｉＯ２胶粉末在５００℃时已转变成锐钛矿结构，６００℃时锐钛矿与金红石结构两相并存，到８００℃时全部转化为金红石结构。

The hydrolysis and polyconsendation of tetra-n-butyl titanate in the presence of N, N-dimethylformamide (DMF) has been studied. The effects of acid and DMF on the reaction rate were investigated. The measurements of TG-DTA and X-ray diffraction showed that the TiO2 gel powder transformed to anatase at 500℃ and transformed totally to rutile via anatase at 800 °C.