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Soft magnetic carbonyl iron microsphere dispersed in grease and its rheological characteristics under magnetic field

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Abstract

Magnetorheological (MR) grease, comprised of a suspension of soft magnetic carbonyl iron (CI) microspherical particles dispersed in a grease medium, was fabricated by a mechanical stirring method. As potential medium oil for MR system, shear viscosity of the pure grease was measured as a function of temperature. Its MR characteristics were investigated using a rotational rheometer under an external magnetic field. Flow curve responses (shear stress and shear viscosity), yield stress, and elasticity were investigated using various magnetic field strengths ranging from 0 to 342 kA/m. It was confirmed that MR grease has a yield stress under no external magnetic field due to the inherent property of grease. In addition, CI based MR grease exhibited a characteristic of a Bingham fluid.

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, Inha University, Incheon, 402-751, Republic of Korea

    Byung O. Park, Bong Jun Park & Hyoung Jin Choi

  2. DST/CSIR Nanotechnology Innovation Centre, National Centre for Nano-Structured Materials, Council for Scientific and Industrial Research, P.O. Box395, Pretoria, 0001, Republic of South Africa

    Mpitloane Joseph Hato

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  1. Byung O. Park
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  2. Bong Jun Park
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  3. Mpitloane Joseph Hato
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  4. Hyoung Jin Choi
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Correspondence to Hyoung Jin Choi.

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Park, B.O., Park, B.J., Hato, M.J. et al. Soft magnetic carbonyl iron microsphere dispersed in grease and its rheological characteristics under magnetic field. Colloid Polym Sci 289, 381–386 (2011). https://doi.org/10.1007/s00396-010-2363-y

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  • DOI: https://doi.org/10.1007/s00396-010-2363-y

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