单分散SiO_2/TiO_2/SiO_2多层复合微球的制备  

Preparation of Monodisperse SiO_2/TiO_2/SiO_2 Multiply Coated Submicrospheres

作　　者：李群艳[1] 董鹏[1] 刘忍肖[1] 白元强[2] 

机构地区：[1]石油大学重质油加工国家重点实验室,北京102200 [2]北京科技大学材料学院,北京102200

出　　处：《无机材料学报》2001年第5期896-902,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(19774073);重质油加工国家重点实验室基金

摘　　要：采用一种以醇盐水解法为基础的生长硅溶胶的方法，制备了粒径为２００ｎｍ的单分散二氧化硅球形颗粒，并将其作为核心，利用常温连续进料的钛酸丁酯水解的多步法，在二氧化硅核心外经多次包覆形成厚层二氧化钛；在正硅酸乙酯的水解和陈化环境下，将上述ＴｉＯ２／ＳｉＯ２复合颗粒外再包覆一薄层二氧化硅，形成一种高折射率，可用于组装光子晶体的ＳｉＯ２／ＴｉＯ２／ＳｉＯ２多层复合微球．对该复合微球用重力沉降法、透射电镜法（ＴＥＭ）、Ｘ射线能谱分析法（ＥＤＳ）进行了表征．其中，重力沉降法是一种将Ｓｔｏｋｅｓ公式为基础推导的复合颗粒的粒径与沉降速度关系式所得的一系列数据进行拟合外延，来测定复合颗粒的粒径及包覆厚度的方法．The monodisperse SiO2/TiO2/SiO2 multiply coated submicrospheres with uniform size, high refractive index and easily assembling property for constructing photonic crystals were prepared. The multilayer complex submicrosphere consisted of a colloidal silica sphere as core, a thick titania coating, and a outermost, thin coating of silica. Monodisperse colloidal silica spheres with 200nm in diameter were synthesized through the hydrolysis of tetraethyl orthosilicate(TEOS) in aqueous ethanol solutions with ammonia as catalyst. The titania coating about 40nm thick on silica cores was formed by the hydrolysis of titanium n-butoxide(TBOT). The hydrolysis of tetraethyl orthosilicate (TEOS) was still used to get the outermost silica coating about 10nm thick on titania. coated silica submicrospheres. The Sio(2), TiO2/SiO2 and SiO2/TiO2/SiO2 submicrospheres were characterized with transmission electron microscopy(TEM), energy dispersive X-ray fluorescence spectroscopy (EDS), and the method of gravity sedimentation separately.

关 键 词：钛酸丁酯 复合颗粒 透射电镜 重力沉降 多层复合微球 光子晶体 二氧化硅 二氧化钛 制备 

分 类 号：TB332[一般工业技术—材料科学与工程]