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Colloid and Polymer Science

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01-02-2011 | Original Contribution

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

Authors: Byung O. Park, Bong Jun Park, Mpitloane Joseph Hato, Hyoung Jin Choi

Published in: Colloid and Polymer Science | Issue 4/2011

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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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Title: Soft magnetic carbonyl iron microsphere dispersed in grease and its rheological characteristics under magnetic field
Authors: Byung O. Park
Bong Jun Park
Mpitloane Joseph Hato
Hyoung Jin Choi
Publication date: 01-02-2011
Publisher: Springer-Verlag
Published in: Colloid and Polymer Science / Issue 4/2011
Print ISSN: 0303-402X
Electronic ISSN: 1435-1536
DOI: https://doi.org/10.1007/s00396-010-2363-y

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