Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102435
Title: Inverse magnetorheological fluids
Authors: Rodríguez-Arco, L.
López-López, M. T.
Zubarev, A. Y.
Gdula, K.
Durán, J. D. G.
Issue Date: 2014
Publisher: Royal Society of Chemistry
Citation: Inverse magnetorheological fluids / L. Rodríguez-Arco, M. T. López-López, A. Y. Zubarev, et al. — DOI 10.1039/c4sm01103a // Soft Matter. — 2014. — Vol. 10. — Iss. 33. — P. 6256-6265.
Abstract: We report a new kind of field-responsive fluid consisting of suspensions of diamagnetic (DM) and ferromagnetic (FM) microparticles in ferrofluids. We designate them as inverse magnetorheological (IMR) fluids for analogy with inverse ferrofluids (IFFs). Observations on the particle self-assembly in IMR fluids upon magnetic field application showed that DM and FM microparticles were assembled into alternating chains oriented along the field direction. We explain such assembly on the basis of the dipolar interaction energy between particles. We also present results on the rheological properties of IMR fluids and, for comparison, those of IFFs and bidispersed magnetorheological (MR) fluids. Interestingly, we found that upon magnetic field application, the rheological properties of IMR fluids were enhanced with respect to bidispersed MR fluids with the same FM particle concentration, by an amount greater than the sum of the isolated contribution of DM particles. Furthermore, the field-induced yield stress was moderately increased when up to 30% of the total FM particle content was replaced with DM particles. Beyond this point, the dependence of the yield stress on the DM content was non-monotonic, as expected for FM concentrations decreasing to zero. We explain these synergistic results by two separate phenomena: the formation of exclusion areas for FM particles due to the perturbation of the magnetic field by DM particles and the dipole-dipole interaction between DM and FM particles, which enhances the field-induced structures. Based on the second phenomenon, we present a theoretical model for the yield stress that semi-quantitatively predicts the experimental results. This journal is © the Partner Organisations 2014.
Keywords: MAGNETIC FIELDS
MAGNETORHEOLOGICAL FLUIDS
RHEOLOGY
ALTERNATING CHAINS
DIPOLAR INTERACTION ENERGY
DIPOLE DIPOLE INTERACTIONS
FIELD APPLICATION
MAGNETO-RHEOLOGICAL
PARTICLE CONCENTRATIONS
RHEOLOGICAL PROPERTY
THEORETICAL MODELING
YIELD STRESS
URI: http://hdl.handle.net/10995/102435
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84905493016
PURE ID: 421165
afe6325f-e526-4fda-a8ac-2e66d22bd313
ISSN: 1744683X
DOI: 10.1039/c4sm01103a
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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