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Preparation of stable magnetorheological fluids based on extremely bimodal iron–magnetite suspensions

Published online by Cambridge University Press:  01 April 2005

M.T. López-López ,
J. de Vicente ,
G. Bossis ,
F. González-Caballero  and
J.D.G. Durán
M.T. López-López
Affiliation:
Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
J. de Vicente
Affiliation:
Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
G. Bossis
Affiliation:
Laboratoire de Physique de la Matière Condensée, Université de Nice-Sophia Antipolis, 06108 Nice Cedex 2, France
F. González-Caballero
Affiliation:
Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
J.D.G. Durán*
Affiliation:
Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
*
a)Address all correspondence to this author.e-mail: jdgarcia@ugr.es
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Abstract

The high magneto-viscous response of magnetorheological fluids (MRFs) comes from the large size (≈1 μm) of the magnetic particles dispersed in the carrier liquid. Unfortunately, in the absence of a magnetic field, this large size constitutes the origin of some problems facing the technological applications of MRFs. These problems are (i) the instability of the suspensions caused by the fast settling of the high density magnetic particles used, and (ii) the poor redispersibility due to an irreversible aggregation. In this work, we used an electromagnetic induction method to study the stability of MRFs containing micron-sized iron particles dispersed in ferrofluids composed by oleate-covered magnetite nanoparticles dispersed in kerosene. Interestingly, we demonstrated that the sedimentation rate in iron/ferrofluid suspensions can be significantly lower than in iron/kerosene MRFs.

Keywords

ColloidalMagneticNanoparticle
Type
Research Article
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 874 - 881
Copyright
Copyright © Materials Research Society 2005

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