Shear and squeeze rheometry of suspensions of magnetic polymerized chains |
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Authors: | Pavel Kuzhir Modesto T López-López Grigory Vertelov Christophe Pradille Georges Bossis |
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Institution: | (1) Laboratoire de Physique de la Matière Condensée, UMR 6622, University of Nice, Parc Valrose, 06108 Nice Cedex 2, France;(2) Laboratory of Organic Catalysis, Moscow State University, Vorob’yovy Gory, 119899 Moscow, Russia |
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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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Keywords: | Magnetorheological fluid Fiber suspension Shear flow Squeezing |
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