Towards high sedimentation stability:: magnetorheological fluids based on CNT/Fe3O4 nanocomposites
Towards high sedimentation stability:: magnetorheological fluids based on CNT/Fe3O4 nanocomposites
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DOI：
10.1088/0957-4484/16/9/012
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发表时间：
2005-09-01
期刊：
影响因子：
3.5
通讯作者：
Jiang, FJ
中科院分区：
文献类型：
--
作者：
Pu, HT;Jiang, FJ
制备了碳纳米管/Fe3O4纳米复合材料。通过透射电镜（TEM）测量，制备的CNT/Fe3O4复合材料的直径约为60 nm，而CNTs的直径约为20 nm。平均表观密度。碳纳米管/Fe3O4纳米颗粒的直径约为1.8克厘米（-3），仅为通常用于磁性颗粒的四分之一。研究了CNT/Fe3O4纳米复合材料磁流变液的沉降和磁流变性能。基于碳纳米管/Fe3O4纳米复合材料的磁流变流体具有高沉降稳定性和明显的磁流变行为，如表观粘度取决于施加的磁场。这些优异的性能主要是由于覆盖在空心碳纳米管外部的软磁层的特殊结构和纳米复合材料的大长径比。
CNT (carbon nanotube)/Fe3O4 nanocomposites were prepared. The diameter of the CNT/Fe3O4 composites prepared was about 60 nm, while the diameter of the CNTs was about 20 nm according to the results of transmission electron microscopy (TEM) measurements. The average apparent density. of the CNT/Fe3O4 nanoparticles was about 1.8 g cm(-3), which is only a quarter of that normally used for magnetic particles. The sedimentation and magnetorheological properties of magnetorheological (MR) fluids based on CNT/Fe3O4 nanocomposites were studied. The MR fluids based on CNT/Fe3O4 nanocomposites exhibit high sedimentation stability and obvious magnetorheological behaviours such as an apparent viscosity depending on the applied field. These predominant properties are mainly due to the special structure of the soft magnetic layer covering the outside of the hollow CNTs and the large length-diameter ratio of the nanocomposites.