均一粒径二氧化钛微球的合成及性能

Synthesis and Characteristics of Homogeneous Titania Microspheres

摘要:

本文以TiCl4为原料，采用沉淀法合成出均一粒径的TiO2微球。利用XRD、SEM、TG，反射光谱仪对TiO2微球进行了结构表征与性能测试。考察了尿素用量、溶剂种类和用量、钛离子浓度、羟丙基纤维素（HPC）质量浓度和合成时间对制备TiO2微球的影响。TiO2微球的最佳合成条件为：c(TiCl4)=0.2 mol/L，V(水):V(正丙醇)=1:3，n(尿素):n(TiCl4)=6:1，HPC的质量浓度为0.85 g/L，90℃下反应80 min，焙烧温度为500℃。在此条件下，合成产率高达87.7%。经XRD、SEM表征，合成产物为TiO2，其粒径可达2~3 μm。以该TiO2微球制备干化学体外诊断试剂的反射、扩散双功能层，结果表明：在400~780 nm可见光范围内，双功能层的光反射率达90.7%以上。血清经双功能层扩散至试剂层，反应后形成的斑点颜色均一，此双功能层扩散均匀且重复性好。

Abstract:

In this paper, the homogeneous diameter TiO2 microspheres were prepared by precipitation method. The structures and characterization of TiO2 microspheres were characterized by XRD, SEM, TG and reflectance spectroscopy. The factors of urea dosage, solvent types and dosage, titanium ion concentration, hydroxypropyl cellulose(HPC) concentration and synthesis time were investigated. The prepared conditions were: c(TiCl4)=0.2 mol/L，V(water):V(n-propanol)=1:3，c(TiCl4)=0.2 mol/L，n(Urea):n(TiCl4)=6:1，HPC concentration was 0.85 g/L, incubated 80 minutes at 90°C and calcinated at 500°C. The yield of TiO2 microspheres was 87.7%.The monodisperse particles were TiO2 and the diameter could reach 2~3 μm with a excellent uniformity which were characterized by XRD and SEM. Furthermore, the reflecting/spreading bifunctional layers prepared with the TiO2 microspheres were studied. The results showed that the reflectance of the bifunctional layer was greater than 90.7% in the range of 400~780 nm. It formed a uniform colour spot after serum spread through bifunctional layer and reacted in reagent layer, which indicated a homodisperse of serum and an excellent reproducibility of this bifunctional layer.