纳米磁性Fe_3O_4-SiO_2复合材料的制备和表征  

Preparation and Characterization of Nano-magnetic Fe_3O_4-SiO_2 Composite

作　　者：刘海弟[1] 赵璇[1] 陈运法[2] 

机构地区：[1]清华大学核能与新能源研究院601室,北京100084 [2]中国科学院过程工程研究所多相反应重点实验室,北京100080

出　　处：《化学研究》2007年第2期21-23,31,共4页Chemical Research

基　　金：中国博士后基金资助项目(20060400437)

摘　　要：向硅酸四乙酯凝胶体系中加入纳米磁性Fe3O4,得到了Fe3O4-SiO2复合材料,利用BET方法测定了其比表面积和孔分布,用TEM分析观察了其粒子形貌,并测定了复合材料的饱和磁强度曲线,研究表明:这种材料的饱和磁强度较纳米Fe3O4有所下降,而比表面积和孔容明显增大.Fe3O4 -SiO2 composite was prepared by dispersing nano-magnetic Fe3 O4 particles into the TEOS gelation system. BET nitrogen adsorption analysis was conducted to investigate the surface area and pore-size distribution of the as-made samples. The particle morphology was observed with transmission electron microscope （TEM） and the magnetization curve of the samples was also obtained. Results indicated that the as-synthesized composite showed lower magnetic saturation but larger BET surface area and bigger pore volume.

关 键 词：超顺磁性 纳米FE3O4 二氧化硅 高比表面 

分 类 号：TQ050.4[化学工程]