超声辅助Stber法制备单分散SiO_2/Fe_3O_4复合磁性微球  

Preparation of Magnetic Composite Microsphere of Monodisperse SiO_2/Fe_3O_4 by the Method of Ultrasonic-assisted Stber

作　　者：左显维[1] 王运福[1] 韩根亮[1] 冯治棋[1] 

机构地区：[1]甘肃省科学院传感技术研究所,甘肃兰州730000

出　　处：《甘肃科学学报》2016年第2期24-27,共4页Journal of Gansu Sciences

基　　金：甘肃省科学院青年基金计划项目(2012QN-04,2013QN-03,2014QN-15)

摘　　要：以超顺磁Fe_3O_4纳米团簇为磁核,在传统Stber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。A research on the influence of ultrasonic power on the dispersity,morphology,structure and magnetic performance upon magnetic composite microsphere of SiO2/Fe3O4 is emphatically conducted by superpara magnetism Fe3O4 nanocluster acting as magnetic nucleus,introducing ultrasonic assistance on the basis of the traditional method of Stober to prepare magnetic composite microsphere of monodisperse SiO2/Fe3O4 which has core-shell structure,and taking advantage of the test methods like XRD,TEM and VSM.The research results indicate that the dispersity of magnetic microsphere can be greatly improved by introducing ultrasound.The aggregate of composite microsphere gets lesser,the coating layer of SiO2 getting thinner and blank microsphere getting lesser with the rise of ultrasonic power.But,SiO2/Fe3O4 microsphere without core-shell structure will emerge when the power overloads.The various property（dispersity and magnetic property）of SiO2/Fe3O4 magnetic composite microsphere is optimal when the ultrasonic power is 20%P.

关 键 词：超声辅助 包覆 FE3O4 超顺磁纳米颗粒 

分 类 号：TB383[一般工业技术—材料科学与工程]