热处理对纳米TiO_2/SiO_2复合粒子微结构的影响  

Influence of Heat Treatment on Microstructure of TiO_2/SiO_2 Nanocomposite

作　　者：杨毅[1] 王起伟[1] 王连军[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210094

出　　处：《南京理工大学学报》2009年第1期142-146,共5页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(50876046;50306008);江苏省博士后基金(0601044B)

摘　　要：为了掌握热处理对纳米复合材料微结构的影响情况,采用溶胶-凝胶法制备了高比表面积及大孔容的纳米TiO2/SiO2复合粒子。利用热分析、XRD、FTIR和比表面积测试仪等仪器对不同热处理条件的纳米复合粒子进行了表征。结果发现,纳米复合粒子中TiO2的锐钛矿型和金红石型晶型转变温度分别由一般的350℃和600℃升高到660℃和770℃,晶粒度随热处理温度的升高和时间的延长而增大;同时,随着热处理温度的升高,复合粒子的比表面积逐渐减小,且微孔减少比例由小孔径微孔占多数逐渐转变为较大孔径微孔占多数。To study the effect of heat treatment on the microstructure of nanometer composites, the nanometer TiO2/SiO2 composites with high special surface area and high pore volume are prepared by sol-gel method with ethyl orthosilicate and tetrabutyl titanate. DSC, TGA, XRD, FTIR and special surface area （BET） tester are employed to analyse the microstructure of the nanocomposite treated by different temperature. The result indicates that the crystal transformation temperature of ana- tase and rutile of nanometer TiO2 in the TiO2/SiO2 composite increases from 350℃ and 600℃ up to 660℃ and 770℃, respectively. It is obviously higher than its general crystal transformation temper- ature. Its crystal diameter increases with the increase of heat treatment temperature and treatment time. With the increase of heat treatment temperature, the special surface area of nanometer Ti02/ SiO2 composite decreases visibly. The reduction proportion of the little micropore in the nanocomposite decreases too, while that of the bigger micropore is increased.

关 键 词：热处理 纳米复合材料 溶胶-凝胶法 微结构 

分 类 号：TG15[金属学及工艺—热处理] TF123.7[金属学及工艺—金属学]