Fe_3O_4包覆碳纳米管软磁性纳米复合微粒的制备及性能  

Preparation and properties of soft magnetic composites based on Fe_3O_4 coated carbon nanotubes

作　　者：蒋峰景[1] 浦鸿汀[1] 杨正龙[1] 殷俊林[2] 

机构地区：[1]同济大学材料学院功能高分子所,上海200092 [2]上海市金属功能材料重点实验室,上海200092

出　　处：《新型炭材料》2007年第4期371-374,共4页New Carbon Materials

基　　金：上海市金属功能材料重点实验室开放基金资助~~

摘　　要：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20nm)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60nm,平均表观密度为1.8g/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0.21T,矫顽力(Hc)为7.67kA/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。Carbon nanotube （CNT）/Fe3O4 composites were prepared by depositing Fe3O4 onto CNTs. The morphologies, magnetic properties, sedimentation stability and magnetorheological properties of the composite particles were investigated by transmission electron microscopy, vibrating sample magnetometer, and a viscosimeter with magnetic equipment. The diameter of CNT/Fe3O4 nano-particles is about 60 nm, while that of CNTs is about 20 nm. The average density of the CNT/Fe3O4 nano-particles is about 1.8 g/cm^3, which is only one-fourth of the normal soft magnetic particles based on Fe3 O4 or Fe powder. The CNT/Fe3 O4 composites have a similar magnetic hysteresis loops to that of Fe3 O4, indicating the good soft magnetic properties of the composite particles. The saturation induction density （BS ） of the composite particles is 0.21 T, and the coercive force （Hc ） is 7.67 kA/m. Magnetorheological fluids based on such CNT/Fe3O4 composites show high sedimentation stability and good magnetorheological properties.

关 键 词：软磁性微粒 碳纳米管 FE3O4 沉降稳定性 磁流变 

分 类 号：TB383.1[一般工业技术—材料科学与工程]