Fe_3O_4/SiO_2介孔组装纤维的制备及磁性能

Preparation and magnetic property of Fe_3O_4/SiO_2 mesoporous assembly fiber

以硝酸铁和正硅酸乙酯为原料,采用溶胶-凝胶法制备了Fe3O4/SiO2介孔组装纤维。当n(Fe)/n(Si)=0.13～0.23,n(H2O)/n(Si)=1.2～2.1时,溶胶体系的成纤性良好。利用TGA-DTA、IR光谱、XRD、SEM对介孔组装纤维进行了表征,结果表明介孔组装纤维表面光滑、致密,直径约为50μm,磁性颗粒约为50nm,镶嵌在无序凝胶网络的介孔中;SiO2主要以无定形态存在,铁以Fe3O4结构存在。利用VSM考察了纤维的磁性能,结果表明Fe3O4/SiO2介孔组装纤维比饱和磁化强度(σs)达11A.m2/kg,呈现良好的软磁特性。

Using nitric iron and teos as raws,Fe3O4/SiO2 mesoporous assembly fiber was synthesized through sol-gel route.When the Fe/Si was equal to 0.13-0.23 and H2O/Si was 1.2-2.1,the stringiness of the sol system was good.The mesoporous assembly fiber was characterized by TGA,IR spectrum,DTA,XRD,SEM.The result showed that the mesoporous assembly fiber had smooth and compact surface with the diameter about 50μm.The magnetic particles are inlaided in the disordered mesoporous gel network and its size is about 50nm.The SiO2 phase of the fiber mainly was existed as armphous and the magnetic particles was Fe3O4.The magnetic property of the fiber was examined by VSM.The result showed that the saturation magnetization（σs） of the fibre is about 11A·m2/kg and has good soft magnetic characteristics.