摘要
以金属盐、柠檬酸和玻璃微珠等为原料,采用非均相沉淀-热还原法制备了纳米金属铁包覆空心玻璃微珠壳-核复合材料。采用SEM/EDS、XRD对包覆前后的复合微球进行了表征,分析了表面活性剂和加料速度对壳-核微球的形成、形貌和物相的影响。结果表明,在优化的工艺条件下,可以制备出晶粒尺寸约为50.2nm的纯铁均匀包覆的壳-核结构复合材料,包覆层显示出均匀、光滑和紧密的特点,包覆层Fe原子为体心立方结构。表面活性剂的加入提高了颗粒分散均匀性,促进了包覆层的形成。随着碳酸氢铵滴加速度的增大,引起均相沉淀的发生,在颗粒表面形成凸起。
The nano-Fe/cenospheres were fabricated by the aqueous heterogeneous precipitation-thermal reduction method using ferrous（II） sulfate,ammonium bicarbonate,ammonium aluminum sulfate and cenospheres as main raw materials.The cenosphere particles were characterized by SEM/EDS,XRD during and after the coating process.The effect of surfactant and the rate of material inputting on forming process,morphology and phase structure was discussed.The results show that the nano-Fe/cenospheres shell-core structure composites were successfully fabricated under optimized conditions,the Fe layer is relatively uniform,smooth and compact and the Fe atoms is body-centered cubic structure with grain size of 50.2nm.Addation of surfactant improve the uniformity of powder,accelerate the formxing of coatings.With the increasing of dripping speed of NH4HCO3,the homogeneous precipitation is arosed and heaves were formed on the surface of powder.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第6期957-960,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(S0674048)
江苏省无机及其复合新材料重点实验室开放基金资助项目(wjjqfuxcl200602)
中国博士后科学基金资助项目(20080431069)
关键词
非均相沉淀-热还原法
纳米FE
玻璃微珠
壳核结构
heterogeneos precipitation-thermal reduction method
nano-Fe
cenosphere
shell-core structure
