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Title: | Iron-sepiolite magnetorheological fluids with improved performances | ||||||||||
Author: | Marins, Jéssica Alves; Plachý, Tomáš; Kuzhir, Pavel | ||||||||||
Document type: | Peer-reviewed article (English) | ||||||||||
Source document: | Journal of Rheology. 2019, vol. 63, issue 1, p. 125-139 | ||||||||||
ISSN: | 0148-6055 (Sherpa/RoMEO, JCR) | ||||||||||
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DOI: | https://doi.org/10.1122/1.5048051 | ||||||||||
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). © 2018 The Society of Rheology. | ||||||||||
Full text: | https://sor.scitation.org/doi/10.1122/1.5048051 | ||||||||||
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