Preparation of well-dispersed magnetorheological fluids and effect of dispersion on their magnetorheological properties |
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Authors: | Modesto T López-López Pavel Kuzhir Georges Bossis Pavel Mingalyov |
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Institution: | (1) Laboratoire de Physique de la Matière Condensée, CNRS UMR 6622, Université de 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: | In this work, we describe methods for the preparation of suspensions of micron-sized iron particles grafted with different
surfactants. The aim is to obtain well-dispersed magnetorheological (MR) fluids. The effectiveness of the surfactants as dispersants
was analyzed quantitatively by means of rheological measurements. With this objective, the viscosity of the suspensions was
measured, and the results were compared with the prediction of the Batchelor’s formula (Batchelor, J Fluid Mech 83:97–117, 1977). The effect of dispersion on the MR properties of the suspensions was also studied. It was found that the
quality of the dispersion of a suspension does not have an important effect on the magnitude of the field-induced yield stress
but does on the change of viscosity induced by the field. It was also found that the transition from the solid-like state
to the liquid-like one happens very smoothly for well-dispersed suspensions, contrarily to the abrupt transition for poorly
dispersed suspensions. |
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Keywords: | Magnetorheological fluids Dispersion Surfactant Yield stress Plastic viscosity |
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