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以SBA-15介孔分子筛为载体,利用溶胶凝胶-浸渍法合成一种新型纳米结构的磁性材料,同时利用XRD及VSM分析了合成介孔材料的微观结构以及磁性能。结果发现,合成材料的Fe2O3纳米颗粒存在于SBA-15的骨架中,而CoFe2O4纳米颗粒存在于介孔孔道中。介孔纳米磁性材料的磁性能可以通过掺杂CoFe2O4及Fe2O3的含量进行控制。掺杂CoFe2O4样品的饱和磁化强度可达未掺杂样品的12倍。此外,利用Kelly-Hankel(δM)曲线研究了合成介孔纳米磁性材料中CoFe2O4与Fe2O3纳米磁性材料间的交换耦合作用,这可以明显提升合成介孔材料的磁性能。
A novel nanostructured magnetic material was synthesized by sol-gel-impregnation method using SBA-15 mesoporous molecular sieve as support. The microstructure and magnetic properties of the synthesized mesoporous material were also analyzed by XRD and VSM. As a result, it was found that the Fe2O3 nanoparticles of the synthetic material were present in the framework of SBA-15 while the CoFe2O4 nanoparticles were present in the mesopore channels. The magnetic properties of mesoporous nano-magnetic materials can be controlled by the content of doped CoFe2O4 and Fe2O3. The saturation magnetization of doped CoFe2O4 samples can reach 12 times that of undoped samples. In addition, Kelly-Hankel (δM) curves were used to study the exchange coupling between CoFe2O4 and Fe2O3 nanomaterials in the synthesized mesoporous nanomaterials, which can obviously improve the magnetic properties of the synthesized mesoporous materials.