Magnetorheological Behavior of Polyethyene Glycol-Coated Fe_3O_4 Ferrofluids

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Author(s)

    • 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
    • SUN Kang
    • Stata Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University
    • WU Jingyuan
    • Stata Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University
    • KANG Xiaoyu
    • Stata Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University

Abstract

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.

Journal

  • Nihon Reoroji Gakkaishi

    Nihon Reoroji Gakkaishi 38(1), 23-30, 2010-02-15

    The Society of Rheology, Japan

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Codes

  • NII Article ID (NAID)
    10029818629
  • NII NACSIS-CAT ID (NCID)
    AN00198812
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    03871533
  • NDL Article ID
    10590837
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z14-725
  • Data Source
    CJP  NDL  J-STAGE 
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