TiO_2水助晶的热分析(英文)  

Thermal Analysis for Water-Assisted Crystallization of TiO_2 Particles

作　　者：范文健[1] 顾敏芬[1,2] 马青玉[1] 王昉[2] 

机构地区：[1]江苏省光电重点实验室,南京师范大学物理科学与技术学院,江苏南京210023 [2]南京师范大学分析测试中心,江苏南京210023

出　　处：《南京师大学报（自然科学版）》2016年第1期62-66,共5页Journal of Nanjing Normal University(Natural Science Edition)

基　　金：Supported by the National Science Foundation of China(11274176,11474166);the Nanjing Laboratory Platform Foundation(1640703064);the Natural Science College Foundation of Jiangsu Province(15KJB150018)

摘　　要：本文提出了一种硅油密封检测水助二氧化钛(TiO_2)结晶的热分析方法.采用溶胶-凝胶法制备了非晶态的TiO_2,经TEM检测其平均粒径约为200 nm,X射线衍射分析表明TiO_2由非晶态向锐钛矿型的转变.热重(TG)和差热(DSC)分析表明,TiO_2有明显的热行为,其能够在低温水浸润环境下实现非晶态向锐钛矿型的转变.同时,硅油作为覆盖层减少了水分的挥发,提高了TiO_2在结晶过程中DSC的测量精度.较高的浸润温度和较长的浸润时间能够降低TiO_2的结晶温度,该研究提供了一种优化低温水浸润环境下合成锐钛矿型TiO_2的方法.An improved thermal treatment with dimethylsilicone fluid sealing was proposed for water-assisted crystallization of TiO2 particles. With the amorphous titanium dioxide（TiO2）particles fabricated using sol-gel method,an average diameter of about 200 nm was first measured by transmission electron microscopy,and then the phase transition of TiO2 from amorphous to anatase was also identified by X-ray diffraction before and after the crystallization process. Obvious thermal behaviors obtained by thermogravimetric（TG）and differential scanning calorimeter（DSC）analysis demonstrated that the conversion from amorphous to anatase phase of TiO2 could be realized at low temperature in water. Meanwhile,with dimethylsilicone fluid sealing,water loss was reduced to enhance the accuracy of DSC during the crystallization of TiO2 particles. Anatase TiO2 can be produced with reduced temperature for higher soaking temperature and longer soaking time. This study provides an environmental method for low-temperature synthesis of anatase TiO2 with the assistance of water.

关 键 词：TIO2 相转变 水助 热分析 硅油密封 

分 类 号：O657[理学—分析化学]