Synthesis and magnetic properties of magnetic-improved SBA 15 mesoporous composites by nanoparticles
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摘要: 利用浸渍法合成了Co3O4/SBA-15和CoFe2O4/SBA-15介孔纳米磁性材料, 并利用X射线粉末衍射(XRD)、 透射电子显微镜(TEM)、 场发射扫描电子显微镜(FESEM)及振动样品磁强计(VSM)对样品的微观结构和磁性能进行了分析。结果显示, Co3O4及CoFe2O4纳米颗粒分布在SBA-15介孔材料的孔道中, 可有效提高SBA-15介孔材料的磁性能。研究发现, SBA-15介孔纳米磁性材料的磁特性由掺杂的纳米磁性颗粒的性质决定, 其磁性能随Co3O4及CoFe2O4含量的增加而升高, 矫顽力可达400Oe, 饱和磁化强度达9emu/g。Abstract: The nano-Co3O4 and nano-CoFe2O4 modified SBA-15 magnetic mesoporous, Co3O4 /SBA-15 and CoFe2O4/SBA-15 composites were prepared by immersion method. The microstructure and magnetic properties of the composites were analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM). All results indicate that Co3O4 and CoFe2O4 nanoparticles exist in the mesopores of SBA-15, which can improve the magnetic properties of the SBA-15 nanocomposites. The study reveals that the magnetic properties of SBA-15 nanocomposites are attributed to the doped magnetic nanoparticles. And the magnetic properties are improved with the content of Co3O4 and CoFe2O4 nanoparticles, in which the coercivity reaches the maximum of 400 Oe and the saturation magnetization is 9emu/g.
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Key words:
- SBA-15 /
- nanoparticles /
- composites /
- mesoporous materials /
- microstructure /
- magnetic properties
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