Abstract
We present the first experimental results on the magnetorheology of suspensions of non-Brownian magnetic ellipsoidal particles. These particles are made of spherical iron particles linked by polymers and are called polymerized chains. Steady shear, oscillatory shear, and oscillatory squeeze rheological tests have been performed. The rheological properties of the suspension of polymerized chains have been compared with those of the suspension of spherical iron particles. In shear flow, both suspensions develop nearly the same yield stress, while in squeeze flow, the yield stress is several times higher for the suspension of polymerized chains. We show that the squeezing force of a suspension of spherical particles is an increasing function of the magnetic field intensity at low magnetic fields but decreases dramatically at higher fields. Surprisingly, this phenomenon, attributed to cavitation or air entrainment, does not occur in the suspension of polymerized chains.
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Abbreviations
- MR:
-
magnetorheological
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Acknowledgments
Eureka E! 3733 Hydrosmart project and “Conseil Régional PACA” (Biomag project) are acknowledged for the financial support. One of the authors (M.T. López-López) also acknowledges financial support by Secretaria de Estado de Universidades e Investigatigacion (MEC, Spain) through its Postdoctoral Fellowship Program.
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Kuzhir, P., López-López, M.T., Vertelov, G. et al. Shear and squeeze rheometry of suspensions of magnetic polymerized chains. Rheol Acta 47, 179–187 (2008). https://doi.org/10.1007/s00397-007-0230-7
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DOI: https://doi.org/10.1007/s00397-007-0230-7