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Magnetorheological fluids containing rod-shaped lithium-zinc ferrite particles: steady-state shear response

Abstract

We report the magnetic field and particle-concentration dependent steady-state shear-responses of rod shaped Li-Zn ferrite particles based magnetorheological fluids (MRFs). The rod-shaped soft ferrimagnetic Li-Zn ferrite (Li0.4Zn0.2Fe2.4O4) particles were synthesized by combustion synthesis method. MRFs of three different particle-concentrations (Φ = 0.1, 0.2 and 0.4, in weight fraction) were prepared using silicone oil and their yield strength and dynamic viscosity were studied at different applied magnetic fields (B). With increase in B and Φ, the yield strength (τY) of the MRFs increases. This behaviour is assigned to the formation of stronger columnar structures of the magnetically interacting particles which resist the flow (shear) of the MRF. For Φ = 0.4 and B = 1.2 T, we observed a maximum τY value of ~ 1.25 kPa. Furthermore, we observed that, based on the on-state to off-state viscosity ratio (ηonoff) at a particular operating B value, the optimum particle concentration required for energy- and cost-efficient operation of the MRFs can be chosen. The absence of stabilizing-agent or de-agglomerating-coating, the low density, the excellent oxidation- and corrosion-resistance of the soft ferrimagnetic rod-shaped Li-Zn ferrite particles makes this MRF-system highly versatile and economical for many magneto-mechanical applications.

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Publication details

The article was received on 19 Apr 2018, accepted on 13 Jun 2018 and first published on 14 Jun 2018


Article type: Paper
DOI: 10.1039/C8SM00807H
Citation: Soft Matter, 2018, Accepted Manuscript
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    Magnetorheological fluids containing rod-shaped lithium-zinc ferrite particles: steady-state shear response

    A. V. Anupama, V. Kumaran and B. Sahoo, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM00807H

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