胶溶法合成 TiO_2超微粒子

THE PREPARATION OF TiO_2 UFP BY USING COLLID CHEMICAL METHOD

用胶溶法合成了 TiO_2超微粒子。研究了反应物浓度、胶溶剂用量、胶溶温度对胶溶过程的影响,以及表面活性剂 DBS 的量与 Ti 萃取率的关系。探讨了合成超微粒子 TiO_2的最佳条件,分析了产品的特性。200℃热处理得到的产品为非晶型圆球状,粒度均匀,平均6.0nm,在许多有机溶剂中具有良好的分散性和透明性。550℃得到晶态锐钛矿型超微粒子 TiO_2,粒度为8.5nm。700℃热处理得到金红石型TiO_2,粒度为33.2nm。

TiO_2 ultrafine particles were prepared from Ti(SO_4)_2 by using collidal chemicalmethod.The most favorable experiment conditions for the preparation of TiO_2 UFP have beenresearched.The spherical amorphous ultrafine TiO_2 product has average diametcrs of 6.0nm,with good dispersity and transparency in many organic solvents.When the product is heated at550℃ for 2h,a-Anatase crystal TiO_2 UFP can be obtained,the average grain size is 8.5nm.Rutile crystal TiO_2 UFP can be obtained when the product is heated at700℃ for 2h,the aver-age grain size is 33.2nm.