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以超顺磁Fe_3O_4纳米团簇为磁核,在传统Stber法的基础上引入超声辅助制备具有核-壳结构的单分散SiO_2/Fe_3O_4复合磁性微球,并使用XRD、TEM、VSM等测试方法,着重研究了超声功率对SiO_2/Fe_3O_4复合磁性微球分散性、形貌、结构、磁性能的影响。研究结果表明:引入超声可极大改善磁性微球的分散性,随着超声功率的增加,复合微球团聚逐渐变少、SiO_2包覆层变薄、空白球减少,但功率过大时,无核-壳结构的SiO_2/Fe_3O_4微球出现;当超声功率为20%P时,SiO_2/Fe_3O_4复合磁性微球各项性能(分散性、磁性能)最优。
The superparamagnetic Fe_3O_4 nanoclusters were used as magnetic cores. Ultrasonic-assisted preparation of monodisperse SiO_2 / Fe_3O_4 composite magnetic microspheres with core-shell structure was carried out on the basis of the traditional Stber method. XRD, TEM, VSM and other tests Method, focusing on the ultrasonic power on the dispersion of SiO 2 / Fe 3 O 4 magnetic microspheres, morphology, structure, magnetic properties. The results show that the introduction of ultrasound can greatly improve the dispersion of magnetic microspheres. With the increase of ultrasonic power, the agglomeration of composite microspheres gradually decreases, the thickness of SiO 2 coating decreases and the number of blank spheres decreases. However, when the power is too high, The SiO_2 / Fe_3O_4 microspheres with core-shell structure appeared. When the ultrasonic power was 20% P, the properties (dispersion and magnetic properties) of SiO_2 / Fe_3O_4 composite magnetic microspheres were the best.