以三聚氰胺-甲醛微球为模板制备均一氧化钆空心球  

Preparation of Uniform Hollow Spheres of Gd_2O_3 by Using Melamine-Formaldehyde Microspheres as Templates

作　　者：张弛[1] 孙刚[1] 欧阳文宜 覃卉婷 李栋辉[1] 姚楚[1] 江学良[1] 

机构地区：[1]武汉工程大学材料科学与工程学院,武汉430074

出　　处：《材料研究学报》2017年第4期285-290,共6页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51273154);武汉工程大学大学生校长基金(CX2015085);武汉工程大学研究生教育创新基金(CX2016003)~~

摘　　要：以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,以尿素为沉淀剂,用均相沉淀法制备出核壳结构前驱体MF/Gd(OH)CO_3复合微球,煅烧除去模板后得到单分散氧化钆(Gd_2O_3)空心球。使用傅立叶红外光谱(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)等手段表征了Gd_2O_3空心球的形貌和结构组成。结果表明,将前驱体煅烧去除了MF模板,非晶态的Gd(OH)CO_3发生热分解反应生成了纯立方晶相的Gd_2O_3空心球,其粒径约为2.4μm,壳层的厚度为120 nm。Monodispersed microspheres of melamine-formaldehyde （MF） was fabricated by polycondensation crosslinking process with aqueous solution of melamine and formaldehyde as raw material. Then the core-shell structure precursor of composite microspheres MF/Gd（OH）CO3 was prepared by a urea-based homogeneous precipitation technique with MF microspheres as templates. Finally hollow microspheres of Gd2O3 were obtained by calcination of the MF/Gd（OH）CO3 to remove tempaltes. The morphology and structure of the hollow microspheres Gd2O3 were characterized by Fourier transform infrared spectroscopy （FT-IR）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X- ray diffractomater （XRD）, X-ray energy dispersive spectroscopy （XPS）, thermal gravimetric analysis （TG） and differential scanning calorimetry （DSC）. The results show that the MF templates can be effectively removed and the amorphous precursor of composite microspheres MF/Gd（OH）CO3 has converted to crystalline Gd2O3 during the annealing progress. The generated hollow spheres of Gd2O3 possess particle size of about 2.4 prn and shell thickness of 120 nm.

关 键 词：无机非金属材料 三聚氰胺-甲醛微球 模板 空心球 GD2O3 

分 类 号：TB383[一般工业技术—材料科学与工程]