Properties of Fe-Co nanoparticles based magnetorheological fluids
ID:51 Submission ID:23 View Protection:ATTENDEE Updated Time:2023-03-14 09:33:31 Hits:493 Oral Presentation

Start Time:2023-06-09 14:15 (Asia/Shanghai)

Duration:15min

Session:[S1] Concurrent Session 1 » [S1-2] Concurrent Session 1-2 & 1-3

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Abstract
        Improving the shear yield strength and sedimentation stability of magnetorheological fluids (MR fluids) is always the focus of research. In previous research, introducing nanoparticles into the micron-particle system is a good strategy to improve both properties. However, the introduction of nanoparticles will lead to an increase in the zero-field viscosity, resulting in a reduced adjustable range and redispersibility of the MR fluids. A more reasonable solution strategy is to reduce the added amounts of nanoparticles by improving their magnetic properties. In this study, we prepared high properties Fe-Co nanoparticles, and studied the rheological properties and sedimentation stability of pure Fe-Co nanoparticles-based MR fluids, for the purpose of analyzing the feasibility as nanoparticles additives. Firstly, the Fe-Co nanoparticles were prepared by DC arc plasma method, and disposed by the low temperature annealing method to further reduce the coercivity. The prepared Fe-Co nanoparticles have 200-400 nm independent spherical structure and 400-800 nm chain structure composed of 30-80 nm spherical particles, high saturation magnetization (208 emu/g), low coercivity (58 Oe) and remanent magnetization (5.8 emu/g). And then, the MR fluids with a mass fraction of 20% were prepared using Fe-Co nanoparticles and silicone oil as dispersed phase and carrier liquid, respectively. The test results of the MCR 301 rotary rheometer show that the prepared MR fluids have a 4.61 kPa shear yield strength under a magnetic field of 436 kA/m, excellent time responsiveness and reversibility. The magnetorheological properties of MR fluids were fitted well by Bingham and power law model, and described by Seo-Seo and Casson fluid model. Meanwhile, the sedimentation ratio of the prepared MR fluids was still 87.3% after 72 h natural sedimentation, indicating an excellent sedimentation stability. In conclusion, this study provided a nanoparticle with excellent properties for introducing the micron-scale MR fluids systems.
Keywords
Fe-Co nanoparticles,DC arc discharge,low temperature annealing,magnetorheological fluids,sedimentation stability
Speaker
Tianxiang Du
Dalian University of Technology

Submission Author
Tianxiang Du Dalian University of Technology
Zian Huang Dalian Jiaotong University
Yitong Liu Dalian University of Technology
Xufeng Dong Dalian University of Technology
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