节点文献
纳米磁性Fe3O4-SiO2复合材料的制备和表征
Preparation and Characterization of Nano-magnetic Fe3O4-SiO2 Composite
【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.
【Abstract】 Fe3O4-SiO2 composite was prepared by dispersing nano-magnetic Fe3O4 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;
【Key words】 superparamagnetism; nano-Fe3O4; silica; high surface area;
【Key words】 superparamagnetism; nano-Fe3O4; silica; high surface area;
【基金】 中国博士后基金资助项目(20060400437)
- 【文献出处】 化学研究 ,Chemical Research , 编辑部邮箱 ,2007年02期
- 【分类号】O614.811
- 【被引频次】51
- 【下载频次】1403