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选用无规则、正八面体和六方片状形貌的纳米Fe3O4磁性颗粒作为磁流体固相材料,通过设计组装基于L–C振荡电路的磁流体稳定性测试仪,确定制备稳定磁流体的较佳表面改性活性剂和辅助表面活性剂用量。同时,对含有不同形貌磁性颗粒的磁流体在水平方向磁场以及竖直方向磁场中的磁流变学性能进行了研究。结果表明:在外加水平方向180、350、500Gs磁感应强度,磁流体的黏度、剪切应力基本不变,磁流体表现出Newtonian流体的流变学特性;在外加竖直方向360、740、1130Gs磁感应强度,磁流体表现出Bingham流体的流变学特性;对于含有正八面体形貌纳米Fe3O4颗粒的磁流体,其黏度和剪切应力随外加磁场的变化较大。
Nano-Fe3O4 magnetic particles with irregular, regular octahedron and hexagonal flake morphology were selected as the magnetic fluid solid phase material. The magnetic fluid stability tester based on L-C oscillation circuit was designed and assembled to determine the preferred surface for preparing stable magnetic fluid Modified actives and cosurfactants. At the same time, the magnetorheological properties of magnetic fluids containing different morphologies of magnetic particles in the horizontal magnetic field and the vertical magnetic field were studied. The results show that the magnetic flux density of 180,350,500 Gs, the viscosity of magnetic fluid and the shear stress are basically unchanged in the horizontal direction. The magnetic fluid shows the rheological characteristics of Newtonian fluid. In addition, the magnetic induction of 360,740 and 1130 Gs The strength and magnetic fluid show the rheological properties of Bingham fluid. The viscosity and shear stress of magnetic fluid with the regular octahedral morphology of Fe3O4 particles change greatly with the applied magnetic field.