Enhanced magnetorheology of soft magnetic carbonyl iron suspension with hard magnetic γ-Fe2O3 nanoparticle additive

Rod-like hard-magnetic nanoparticles of γ-Fe 2 O 3 were used as an additive to a soft magnetic carbonyl iron (CI) microsphere-based magnetorheological (MR) suspension to improve the dispersion stability of the MR fluid and enhance its MR performance. The morphology of the pure CI microspheres and CI...

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Bibliographic Details
Published in:Colloid and polymer science 2015-02, Vol.293 (2), p.641-647
Main Authors: Jang, Dae Sung, Liu, Ying Dan, Kim, Jung Hyun, Choi, Hyoung Jin
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Food Science
Nanotechnology and Microengineering
Physical Chemistry
Polymer Sciences
Short Communication
Soft and Granular Matter
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Summary:Rod-like hard-magnetic nanoparticles of γ-Fe 2 O 3 were used as an additive to a soft magnetic carbonyl iron (CI) microsphere-based magnetorheological (MR) suspension to improve the dispersion stability of the MR fluid and enhance its MR performance. The morphology of the pure CI microspheres and CI/γ-Fe 2 O 3 mixture particles were examined by scanning electron microscopy. The MR properties of pure CI and CI/γ-Fe 2 O 3 mixtures were measured from steady and oscillatory tests under different magnetic field strengths. The results showed that the CI/γ-Fe 2 O 3 MR fluid exhibited higher yield behaviors with an enhanced MR effect than that of the pure CI MR fluid due to the increased magnetic properties. Physically attached γ-Fe 2 O 3 nanoparticles onto the surface of micron-sized CI particles improved not only MR performance but also dispersion stability of the MR particles.
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-014-3475-6