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Date of Publication:2022-10-10

Journal:功能材料

Issue:18

Page Number:2641-2644

ISSN No.:1001-9731

Abstract:Cobalt particles were prepared by hydrothermal method.Their composition,morphology,and mag-netic property were analyzed by X-ray diffractometer,scanning electron microscope and vibrating sample mag-netometer,respectively.The results indicated the composition of the particles was pure cobalt with close-packed hexagonal structure.The particles presented hollow structure with particle size distributed in the range of 3 to 5 micrometers.The saturation magnetization of the particles was 161A·m2/kg,which was close to that of carbonyl iron particle (CIP).Magnetorheological (MR)fluids were prepared with the hollow cobalt particle (HCP),the volume fraction of which was 12%,and silicone oil.Their properties were tested,the results of which indicated that the MR fluids presented a field-induced yield stress of 3 7 kPa.Their shear stress stability with time at constant shear rate,and sedimentation stability during long time standing was better than that of the MR fluids based on carbonyl iron particles with the same volume fraction.

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