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利用三聚氰胺和甲醛在水溶液中缩聚交联生成的单分散三聚氰胺-甲醛(MF)微球为模板,尿素为沉淀剂,通过均相沉淀法制备出核壳结构前驱体,煅烧除去模板,得到氧化钇(Y_2O_3)空心球。通过傅立叶红外光谱(FT-IR)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)、X射线衍射分析(XRD)、X射线能谱仪(XPS)、热重分析(TG)和差示扫描量热分析(DSC)对Y_2O_3空心球的形貌与结构组成进行表征。结果表明,经煅烧后,MF模板可被有效去除,无定形的前驱体转变成结晶的Y_2O_3,生成粒径约1.7μm、壳层厚度为100 nm的Y_2O_3空心球。
The monodispersed melamine-formaldehyde (MF) microspheres produced by condensation polymerization of melamine and formaldehyde in aqueous solution were used as templates and urea was used as precipitating agent. The precursors of core-shell structure were prepared by homogeneous precipitation method, and the template was calcined to obtain yttrium oxide (Y_2O_3) hollow sphere. The structures of the composites were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray energy dispersive spectroscopy (XPS) Scanning calorimetry (DSC) was used to characterize the morphology and structure of Y 2 O 3 hollow spheres. The results show that the MF template can be effectively removed after calcination, and the amorphous precursor is transformed into crystalline Y_2O_3 to form Y_2O_3 hollow spheres with particle size of about 1.7μm and shell thickness of 100 nm.