不同酸对γ-Fe_2O_3/SiO_2纳米复合粉体特性的影响  

Influence of Acids on the Properties of γ-Fe_2O_3/SiO_2 Nanocomposites

作　　者：付红平[1] 洪若瑜[1,2] 李洪钟[2] 尉东光[3] 

机构地区：[1]苏州大学材料与化学化工学部,有机合成江苏省重点实验室,江苏苏州215123 [2]中国科学院过程工程研究所,北京100080 [3]哈佛大学工程与应用科学学院,美国马萨诸塞州02139

出　　处：《材料科学与工程学报》2009年第2期229-232,254,共5页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(20876100;20736004);973资助项目(2009CB219904);中科院过程所多相反应与复杂系统国家重点实验室资助项目(2006-5);江苏省博士后科研资助项目

摘　　要：以正硅酸乙酯及铁盐为原料,通过溶胶-凝胶法制备γ-Fe2O3/SiO2纳米复合粉体。采用红外吸收光谱、X射线衍射仪、透射电镜及振动样品磁强计等对复合粉体进行表征。结果表明:以不同铁盐为前驱体得到不同晶型的Fe2O3;不同酸对磁性复合粉体的性能有重要影响:加硝酸时,γ-Fe2O3大小为15nm,其饱和磁化强度大;加入醋酸时得到的γ-Fe2O3颗粒为5nm,且粒度分布变窄,但其饱和磁化强度明显下降;并对γ-Fe2O3在SiO2中的合成机理进行了探讨。γ-Fe2O3/SiO2 nanocomposites were prepared via sol-gel processing using tetraethylorthosilicate and ferric salt as starting materials. The particle size and properties of γ-Fe2O3/SiO2 nanocomposites were studied by transmission electron microscopy, X-ray diffraction, Fourier Transform Infrared Spectroscopy and vibrating sample magnetometer. The influence of different precursors on the iron oxide was studied. Different acids added during the preparation＇play an important role on the properties of γ-Fe2O3/SiO2 nanocomposites. That is, the size of the obtained γ-Fe2O3 nanoparticles is enlarged and the saturation magnetization is increased as nitric acid added. When the acetic acid is used, the size of the obtained γ-Fe2O3 nanoparticles is reduced, the particle size distribution is narrowed and the saturation magnetization is lowered. The reaction mechanism of the γ-Fe2O3 embedded in SiO2 was investigated.

关 键 词：γ-Fe2O3/SiO2 溶胶-凝胶法 纳米复合粉体 磁性能 

分 类 号：TQ174[化学工程—陶瓷工业]