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本实验首先采用stober法制备出SiO2颗粒,实验过程中硅酸乙酯和氨水的量影响SiO2颗粒的大小。然后通过相吸附法将TiO2包覆到SiO2颗粒表面,通过SEM和XRD对所得到的样品进行表征,实验结果表明,在光滑的SiO2微球表面包覆上一层粗糙的TiO2壳层,壳层厚度和样品分散性通过控制实验过程中钛酸丁酯的加入量可以控制,实验中可以得到分散性良好且层厚在20nm左右的样品。通过XRD我们发现,包覆在SiO2表面的TiO2具有较高的结晶温度和晶型转变温度。
In this experiment, stober method was used to prepare SiO2 particles. The amount of ethyl silicate and ammonia affected the size of SiO2 particles during the experiment. Then TiO2 was coated on the surface of SiO2 particles by phase adsorption method. The obtained samples were characterized by SEM and XRD. The experimental results show that the surface of smooth SiO2 microspheres coated with a layer of rough TiO2 shell, shell The thickness and sample dispersibility can be controlled by controlling the amount of butyl titanate during the experiment. In the experiment, samples with good dispersibility and thickness of about 20 nm can be obtained. Through XRD, we found that TiO2 coated on the surface of SiO2 has higher crystallization temperature and crystal transition temperature.