用水解沉淀法在碳纳米管(CNTs)外包覆Fe3O4,制备了CNTs/Fe3O4纳米复合磁性微粒,借助透射电镜、振动探针式磁强计和外加磁场黏度计对其微观形貌、静态磁性能、沉降稳定性和磁流变性能进行了研究.结果表明:Fe3O4在碳纳米管(直径约20 nm)表面形成了紧密的包覆层,微粒呈一维纳米管状结构,平均管径约60 nm,平均表观密度为1.8 g/cm3,为传统磁流变液中所用铁粉等软磁性颗粒密度的四分之一.复合微粒的磁滞回线与Fe3O4纳米颗粒较为相似,具有较好的软磁性,其饱和磁感应强度(Bs)为0.21 T,矫顽力(Hc)为7.67 kA/m,用该软磁性复合微粒配制的磁流变液具有良好的沉降稳定性和磁流变特性.
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