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• W2906757946 startingPage "125" @default.
• W2906757946 abstract "This work is focused on the characterization and magnetorheological (MR) study of MR fluids composed of iron particles and sepiolite fibers, used as a thickening agent. The work is aimed at (a) understanding the effect of the sepiolite addition on the MR response and (b) finding an appropriate formulation allowing a good sedimentation stability keeping a relatively low off-state viscosity and providing an enhanced MR effect. In the presence of an applied magnetic field, the composite MR fluid exhibits a yielding behavior with a progressive enhancement of the field-induced static yield stress with increasing volume fractions of both iron and sepiolite. Such an effect is attributed to a friction between gap-spanning aggregates composed of iron particles and sepiolite–oil viscoplastic matrix. The field-induced dynamic yield stress shows an initial increase with the sepiolite concentration (explained by a partial expulsion of the sepiolite fibers from the aggregates) followed by a decrease. The proposed mechanisms are supported by developed qualitative theoretical models, one of which is based on the homogenization approach of Château et al. [J. Rheol. 52, 489–506 (2008)]. From the practical point of view, the formulation containing 10 vol. % of iron and 4 vol. % of sepiolite seems to combine a perfect sedimentation stability with moderate values of the plastic viscosity and of the off-state static yield stress (only ∼5 Pa) and with a relatively important static and dynamic yield stress enhancement (30% and 60%, respectively)." @default.
• W2906757946 created "2019-01-11" @default.
• W2906757946 creator A5014640383 @default.
• W2906757946 creator A5072655832 @default.
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• W2906757946 date "2018-12-31" @default.
• W2906757946 modified "2023-10-18" @default.
• W2906757946 title "Iron–sepiolite magnetorheological fluids with improved performances" @default.
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• W2906757946 doi "https://doi.org/10.1122/1.5048051" @default.
• W2906757946 hasPublicationYear "2018" @default.
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