摘要
含NH3·H2O和TiCl4的微乳液经混合、反应，得到TiO2超细粒子前驱体──水合TiO2，用紫外－可见光对不同反应时间t和ω（ω＝［水］／［表面活性剂］）时合产物混合液作跟踪测定，结果表明吸收峰位置随反应进行或ω增大发生红移；水合TiO2经不同温度缓烧所得粒子用XRD、IR、TEM、BET、EDS等手段进行表征，结果表明经650℃煅烧后粒子为锐钛型TiO2，平均晶粒尺寸24．6nm，比表面积53．8m2／g；经100℃煅烧后粒子为金红石型TiO2，平均晶粒尺寸53．5nm，比表面积20．3m2／g。
The precursor of TiO2 ultrafine particles, titanium hydroxides, were synthesized in nonionic water in oiI (W/O) microemulsions.The red - shifted peak appeared in the UV - VIS spectrum when the vatue of co (ω= [H2O]/ [surfactant] ) or reaction time increased.The hydroxide particles were calcined at 650℃ and 1000℃ to form TiO2 ultrafine particles. The measurement of IR, XRD, TEM, EDS, BET surface area were used to characterized the particles. The results showed that the samples calcined at 650℃ were anatase Phase, and the average grain size and BET specific surface area were 24. 6nm and 53. 8m2/g respectively, and the samples calcined at 1000℃ were rutile phase, the average grain size and BET specific surface area were 53. 5nm and 20. 3m2/g respectively.
出处
《功能材料》
EI
CAS
CSCD
北大核心
1999年第5期495-497,共3页
Journal of Functional Materials
