Magnetorheological behavior of polyethyene glycol-coated Fe304 ferrofluids

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  • Qiao Xiuying
    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University
  • Bai Mingwen
    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University
  • Tao Ke
    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University
  • Gong Xinglong
    CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China
  • Gu Rui
    CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China
  • Watanabe Hiroshi
    Institute of Chemical Research, Kyoto University
  • Sun Kang
    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University
  • Wu Jingyuan
    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University
  • Kang Xiaoyu
    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University

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  • Magnetorheological Behavior of Polyethyene Glycol-Coated Fe3O4 Ferrofluids

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Polyethyene glycol (PEG)-coated Fe3O4 ferrofluids were prepared by suspending the PEG-coated Fe3O4 nanoparticles in an oligomeric PEG-400 carrier liquid, and their magnetorheological steady flow behavior was investigated. The PEG modification did not change the crystalline structure of Fe3O4, and the PEG-coated Fe3O4 nanoparticles were of nearly spherical shape and had a narrow size distribution (4±1 nm in diameter). These nanoparticles exhibited no significant aggregation in the absence of the magnetic field. Under the magnetic field, the nanoparticles aggregated into string-like clusters oriented in the direction of the field. Correspondingly, the ferrofluids behaved essentially as the Newtonian fluids in the absence of the magnetic field but exhibited, under the magnetic field, a magnetorheological effect, i.e., the increase of the shear stress/viscosity associated with a pseudo-plastic and thinning character with no real yield stress. This lack of the real yield stress, possibly reflecting the absence of huge clusters connecting the measuring parts (plates) in the rheometer, suggested that the magnetorheological effect of the ferrofluids were related to deformation/disruption of the magnetically formed clusters of finite sizes under the shear. Interestingly, this effect was most significant for the Fe3O4 nanoparticles having an intermediate amount of PEG coating. This result suggested a possibility that the relaxation of PEG chains in the coating layers of nanoparticles in the clusters contributed to the magnetorheological effect.

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