摘要
采用超声Stber法制备了单分散性的纳米载体SiO2,再采用Pechini溶胶-凝胶制备法制备出SiO2/TiO2复合微球。通过X射线衍射仪、场发射扫描电子显微镜(FESEM)对粉体的晶型和显微形貌进行测试分析。结果表明:纳米载体SiO2球形颗粒为无定形态,TiO2粉体为形貌多样的块状颗粒,大颗粒粒径大于10μm;Ti/Si(摩尔比)的变化明显影响合成复合粉体的形貌和粒径,当Ti/Si=1:3时可获得球形复合微球,且不存在块状颗粒。
Monodisperse SiOz particles were synthesized by Sttiber method using ultrasound field. The SiO2/TiO2 core - shell particles were prepared by Pechini sol - gel method. The crystal phases and mi- cromorphology were characterized by X - ray diffraction （XRD） and Scanning electron microscope （SEM）. The results show that the SiO2 particles are monodisperse non -crystalline solid particles about 300nm. The SEM images of TiO2 powders show wide distribution of TiO2 particles having varied shape. And the large TiO2 particles are larger than 10μm. The micromorphology of SiO2/TiO2 particles changes significantly with the increment of Ti/Si （mol/mol）. SiO2/TiO2 core -shell particles could be obtained when Ti/Si = 1：3.
出处
《功能材料与器件学报》
CAS
CSCD
北大核心
2012年第4期318-321,共4页
Journal of Functional Materials and Devices
基金
陕西省自然科学基金(No.2010JQ6006
No.2009JM6008)
