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Iron-sepiolite magnetorheological fluids with improved performances

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dc.title Iron-sepiolite magnetorheological fluids with improved performances en
dc.contributor.author Marins, Jéssica Alves
dc.contributor.author Plachý, Tomáš
dc.contributor.author Kuzhir, Pavel
dc.relation.ispartof Journal of Rheology
dc.identifier.issn 0148-6055 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2019
utb.relation.volume 63
utb.relation.issue 1
dc.citation.spage 125
dc.citation.epage 139
dc.type article
dc.language.iso en
dc.publisher Society of Rheology
dc.identifier.doi 10.1122/1.5048051
dc.relation.uri https://sor.scitation.org/doi/10.1122/1.5048051
dc.description.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. en
utb.faculty University Institute
dc.identifier.uri http://hdl.handle.net/10563/1008461
utb.identifier.obdid 43880400
utb.identifier.scopus 2-s2.0-85059505881
utb.identifier.wok 000455087200012
utb.identifier.coden JORHD
utb.source j-scopus
dc.date.accessioned 2019-07-08T11:59:48Z
dc.date.available 2019-07-08T11:59:48Z
dc.description.sponsorship French Government [ANR-15-IDEX-01]; Brazilian CNPq [203100/2014]; Czech Ministry of Education, Youth and Sports of the Czech Republic-Program NPU I [LO1504]
utb.ou Centre of Polymer Systems
utb.contributor.internalauthor Plachý, Tomáš
utb.wos.affiliation [Marins, Jessica A.; Plachy, Tomas; Kuzhir, Pavel] Univ Cote Azur, Inst Phys Nice, CNRS UMR 7010, Parc Valrose, F-06108 Nice, France; [Plachy, Tomas] Tomas Bata Univ Zlin, Ctr Polymer Syst, Trida Tomase Bati 5678, Zlin 76001, Czech Republic
utb.scopus.affiliation CNRS UMR 7010, Institute of Physics of Nice, University Côte d'Azur, Parc Valrose, Nice, 06108, France; Centre of Polymer Systems, Tomas Bata University in Zlin, trida Tomase Bati 5678, Zlin, 760 01, Czech Republic
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