不同制备方法对TiO_2-SiO_2复合气凝胶结构的影响  

The effection of different method on the characterize of SiO_2-TiO_2 composite aerogels

作　　者：冷映丽[1] 沈晓冬[1] 崔升[1] 滕凯明[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《化工新型材料》2008年第8期56-57,69,共3页New Chemical Materials

基　　金：江苏省自然科学基金项目(BK2007586);江苏省博士后科研资助计划项目(0701012B)

摘　　要：分别以物理法和化学法制备TiO2-SiO2复合气凝胶。采用XRD、SEM、TEM等对两种方法制得的气凝胶进行结构分析,并结合DSC-TG对样品进行热稳定性分析。结果表明:虽然两种方法制备的气凝胶微观上都是以TiO2晶体分散在SiO2网络结构中,但化学法制得的样品晶体结构单一,而物理法制得的样品以锐钛矿和金红石两种结构存在。化学法制备的TiO2颗粒小且分散更均匀,化学法获得的气凝胶高温热稳定性也更好。SiO2-TiO2 compound aerogels was prepared through physical and chemical process, respectively. The structure of the obtained aerogel was characterized by XRD, SEM and TEM, and the therrnostability of which was analysed with DSC-TG. The results indicated that, the microstructure of both kinds of compound aerogel turned to be TiO2 crystal dispersed in the network of SiO2 aerogel. But the one got by chemical method adopted the sole anatase TiO2 crystal structure, and the other got by physical method adopted anatase and rutile TiO2 crystal structure. The dimensions of chemical prepared TiO2 particles were smaller and more homodispersed than physical prepared, and the HT-thermostability of chemical prepared aerogel was better.

关 键 词：TiO2-SiO2复合气凝胶 结构 热稳定性 

分 类 号：O611.3[理学—无机化学]