Preparation and characterization of carbonyl iron/strontium hexaferrite magnetorheological fluids |
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| Affiliation: | 1. College of Chemistry, Chemical Engineering and Materials Science & Jiangsu Provincial Key Laboratory of Organic Synthesis, Soochow University, Suzhou 215123, China;2. School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China;3. Jiangsu Provincial Key Laboratory of Environmental Materials and Engineering, Yangzhou University, Yangzhou 225002, China;4. Suzhou Nanocomp Inc., Suzhou New District, Suzhou 215011, China;1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;2. Department of Polymer Science and Engineering, Inha University, Incheon 402-751, South Korea;1. Research Center for Engineering of Systems with Complex Fluids, Politehnica University of Timisoara, Bd. M. Viteazu No. 1, 300222 Timisoara, Romania;2. Faculty of Physics, West University of Timisoara, Bd. V. Parvan No. 4, 300222 Timisoara, Romania;3. Center for Fundamental and Advanced Technical Research, Romanian Academy – Timisoara Branch, Bd. M. Viteazu No. 24, 300223 Timisoara, Romania;1. School of Materials Science and Engineering, Hebei University of Engineering, Handan, 056038, China;2. School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China;1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China;2. School of Engineering, Zhejiang Normal University, Zhejiang, 321004, China;3. School of Mechanical Engineering, Jiaxing University, Zhejiang, 314001, China;1. Department of Mechanical Engineering, Gharda Institute of Technology, Mumbai University, MS 415 708, India;2. Department of Mechanical Engineering, Rajarambapu Institute of Technology, Shivaji University, Kolhapur, MS 415 004, India |
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| Abstract: | The heat transfer oil-based magnetorheological fluid (MRF) was prepared using oleic acid-modified micron carbonyl iron powder as a magnetic dispersed phase and strontium hexaferrite (SrFe12O19) nanoparticles as an additive. The sedimentation stability of MRFs was studied. The results indicated that the stability of MRFs was improved remarkably by adding SrFe12O19 nanoparticles and the sedimentation ratio was only 0.88 in 20 days when the content of nanoparticles reached 10 wt%. The rheological properties were characterized by a HAAKE rheometer without a magnetic field and a capillary rheometer with and without a magnetic field. The effects of SrFe12O19 nanoparticles, the temperature, and magnetic field strength were investigated. In addition, the rheological properties could be predicted well using the improved Herschel–Bulkley model, even under a magnetic field. A theoretical model was also proposed to predict the yield stress based on the microstructure of the MRF under an applied magnetic field. |
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| Keywords: | Strontium hexaferrite Magnetorheological fluid Stability Rheological property |
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