摘要
采用乙腈与乙醇混合溶剂体系制备出了单分散的亚微米级TiO2球形胶体颗粒,并对乙腈相对含量以及实验温度等参数的影响进行了研究.结果表明5℃下乙腈相对含量为70%时可制得高质量的单分散胶体颗粒.通过TEM、SEM、粒度分析等表征手段,表明所得胶体颗粒平均直径约为540nm,标准偏差在5%以内,颗粒的多分布系数为0.013,TG-DSC分析表明胶体颗粒为含水量很少的水合TiO2;XRD分析表明单分散TiO2胶体颗粒在600℃高温烧结由无定型转变为锐钛矿型,在900℃高温烧结则开始出现金红石型.
The monodisperse spherical particles of TiO2 were prepared by sol-gel process in mixed solvents at low temperature, The TEM, SEM, and size distribution analysis showed that the size variation of as-synthesized spherical TiO2 colloidal particles is within 5% and the polyindex is 0.013. The thermal analysis clearly demonstrated that assynthesized particles were hydrous amorphous TiO2. The structure of the TiO2 colloids after annealed at different temperatures were determined by XRD. The results showed that the phase transition from amorphous to anatase occurred at a temperature around 600℃ and both t-utile and anatase appeared at 900℃.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2006年第3期365-368,共4页
Acta Physico-Chimica Sinica
基金
国家高科技研究发展863纳米专项基金(2002AA302108
2004AA302012
2002AA305301)
国家自然科学基金(20301015)资助项目.
关键词
二氧化钛
单分散
混合溶剂
低温
TiO2, Monodisperse, Mixed solvents, Low temperature
