Magnetic effect in viscosity of magnetorheological fluids

3rd International Meeting for Researchers in Materials and Plasma Technology; 1st Symposium on Nanoscience and Nanotechnology

物理学;材料科学

Fonseca, H.A.^1 ; Gonzalez, E.^1 ; Restrepo, J.^2 ; Parra, C.A.^1 ; Ortiz, C.^1

Universidad Pedagógicay Tecnológica de Colombia, Boyacá, Tunja, Colombia^1

Universidad de Antioquia, Medellín, Antioquia, Colombia^2

关键词: Applied magnetic fields;    External fields;    External magnetic field;    Flow resistance;    Hydrodynamic volumes;    Magnetic effects;    Rotational symmetries;    Vibrating sample magnetometer;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/687/1/012102/pdf
DOI  :  10.1088/1742-6596/687/1/012102

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this work the study of viscosity is presented for a magnetorheological fluid made from iron oxides micrometre, under an external magnetic field. The material was characterized by magnetic loops in a vibrating sample magnetometer and its crystal structure by X-ray diffraction. The results show that saturation magnetization and coercive field have dependence with the powder size. The material has different crystal structure which lattice parameters were determined by Rietveld refinement. The viscosity of the magnetorheological fluid was measured by a viscometer with rotational symmetry with and without external field. This result evidence a dependency on the size, percentage iron oxide and the applied magnetic field, it is due to the hydrodynamic volume of iron oxide interacts with the external magnetic field, increasing the flow resistance.