磁性SiO_2/Fe_3O_4复合粒子的制备研究  

Preparation of SiO_2/Fe_3O_4 magnetic composites

作　　者：柯磊[1] 姜继森[2] 马学鸣[3] 

机构地区：[1]上海电机学院数理研究所,上海201306 [2]华东师范大学物理系,上海200241 [3]华东师范大学波谱学与光谱学国家重点实验室,上海200062

出　　处：《化工新型材料》2014年第3期33-35,共3页New Chemical Materials

基　　金：国家自然科学基金资助项目(10804071);上海高校青年教师培养资助计划项目(12AZ16);上海市教委科研创新项目(12YZ185);上海电机学院科研启动基金项目(11C409)

摘　　要：采用共沉淀法在硅酸钠溶液中将磁性Fe3O4纳米粒子进行包裹处理，得到表面包覆SiO2薄层的复合粒子，并通过XRD、TEM、穆斯堡尔谱、磁性能测试等手段对包裹样品进行了表征。实验结果表明，共沉淀法制备的复合粒子由磁性Fe3O4粒子核和外部的SiO2包裹层组成，复合粒子的粒径分布为介于20-30nm，包裹后的样品具有典型的铁磁性特征，比饱和磁化强度Ms为23．250emu／g。与单一的Fe3O4纳米颗粒相比，磁性Si02／Fe3O4复合粒子除了具有良好的磁学性能、较小的矫顽力、较小的剩余磁化强度外，有着非常好的耐酸性和抗氧化性。TheFe3O4magnetic nanoparticles coated with silica were synthesized by chemic deposition. The effect of silica coatings on phase composition, microstructure and magnetic properties of the composites were investigated. Experi- mental results showed that the composites exhibited fine magnetic properties. The value of average particle size and specific saturation magnetization were 20 - 30nm and 23. 250 emu/g, respectively. The amorphous SiO2 coatings prevented the Fe3 O4 nanoparticles being oxidated, which caused the good magnetism behavior of the composites with little coercivity and remanence, also was the origin for the increase of acid resistance.

关 键 词：FE3O4 SIO2 包裹 磁性 复合粒子 

分 类 号：TB332[一般工业技术—材料科学与工程]