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论文类型：期刊论文

发表时间：2019-12-01

发表刊物：JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

收录刊物：EI、SCIE

卷号：491

ISSN号：0304-8853

关键字：Iron nanoparticles; DC arc discharge; Magnetorheological fluids; Sedimentation stability; MR effect

摘要：It is a great challenge to make a balance between magnetorheological (MR) effect and sedimentation stability for magnetorheological (MR) fluids. Iron nanoparticle would be a good candidate to achieve this balance, but it lacks efficient preparation method. In this study, a DC arc discharge method was used to prepare iron nanoparticles. Their morphology, magnetic properties, crystal structures and surfaces chemical composition were examined, which confirmed their nano size (similar to 40 nm), high saturation magnetization (similar to 146 emu/g), and high purity. The iron nanoparticles and commercial carbonyl iron micro-sized particles were used as the dispersing phase to prepare MR fluids, respectively. Their magnetorheological effect and sedimentation stability were measured for comparison. The results indicate that the iron nanoparticles-based MR fluids present a slight lower MR effect, but much better sedimentation stability with respect to the MR fluids with carbonyl iron micro-sized particles.