Magnetophoresis of colloidal particles in a dispersion of superparamagnetic nanoparticles: Theory and experiments

M. Benelmekki; Ll M. Martinez; J. S. Andreu; J. Camacho; J. Faraudo

doi:https://doi.org/10.1039/c2sm25243k

Magnetophoresis of colloidal particles in a dispersion of superparamagnetic nanoparticles: Theory and experiments

M. Benelmekki, Ll M. Martinez, J. S. Andreu, J. Camacho, J. Faraudo

Research output: Contribution to journal › Article › Research › peer-review

19 Citations (Scopus)

Abstract

Recent works have demonstrated the exciting possibility of inducing a tunable magnetic behavior in non-magnetic colloids by immersing them in a dispersion of superparamagnetic nanoparticles (NPs). Here we show experimentally that non-magnetic latex particles in a dispersion of superparamagnetic NPs experience a nontrivial, two-step "go and come-back" motion when brought under a uniform magnetic gradient. Our theoretical analysis indicates that the observed motion is due to the combined effect of the behavior of latex particles as magnetic holes and the adsorption of NPs at the latex surface. In agreement with theory, the NPs adsorption has been confirmed in our experiments by three independent experimental techniques (EDS, SEM and electrophoresis). © 2012 The Royal Society of Chemistry.

Original language	English
Pages (from-to)	6039-6047
Journal	Soft Matter
Volume	8
DOIs	https://doi.org/10.1039/c2sm25243k
Publication status	Published - 14 Jun 2012

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title = "Magnetophoresis of colloidal particles in a dispersion of superparamagnetic nanoparticles: Theory and experiments",

abstract = "Recent works have demonstrated the exciting possibility of inducing a tunable magnetic behavior in non-magnetic colloids by immersing them in a dispersion of superparamagnetic nanoparticles (NPs). Here we show experimentally that non-magnetic latex particles in a dispersion of superparamagnetic NPs experience a nontrivial, two-step {"}go and come-back{"} motion when brought under a uniform magnetic gradient. Our theoretical analysis indicates that the observed motion is due to the combined effect of the behavior of latex particles as magnetic holes and the adsorption of NPs at the latex surface. In agreement with theory, the NPs adsorption has been confirmed in our experiments by three independent experimental techniques (EDS, SEM and electrophoresis). {\textcopyright} 2012 The Royal Society of Chemistry.",

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AU - Benelmekki, M.

AU - Martinez, Ll M.

AU - Andreu, J. S.

AU - Camacho, J.

AU - Faraudo, J.

PY - 2012/6/14

Y1 - 2012/6/14

N2 - Recent works have demonstrated the exciting possibility of inducing a tunable magnetic behavior in non-magnetic colloids by immersing them in a dispersion of superparamagnetic nanoparticles (NPs). Here we show experimentally that non-magnetic latex particles in a dispersion of superparamagnetic NPs experience a nontrivial, two-step "go and come-back" motion when brought under a uniform magnetic gradient. Our theoretical analysis indicates that the observed motion is due to the combined effect of the behavior of latex particles as magnetic holes and the adsorption of NPs at the latex surface. In agreement with theory, the NPs adsorption has been confirmed in our experiments by three independent experimental techniques (EDS, SEM and electrophoresis). © 2012 The Royal Society of Chemistry.

AB - Recent works have demonstrated the exciting possibility of inducing a tunable magnetic behavior in non-magnetic colloids by immersing them in a dispersion of superparamagnetic nanoparticles (NPs). Here we show experimentally that non-magnetic latex particles in a dispersion of superparamagnetic NPs experience a nontrivial, two-step "go and come-back" motion when brought under a uniform magnetic gradient. Our theoretical analysis indicates that the observed motion is due to the combined effect of the behavior of latex particles as magnetic holes and the adsorption of NPs at the latex surface. In agreement with theory, the NPs adsorption has been confirmed in our experiments by three independent experimental techniques (EDS, SEM and electrophoresis). © 2012 The Royal Society of Chemistry.

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DO - https://doi.org/10.1039/c2sm25243k

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JO - Soft Matter

JF - Soft Matter

SN - 1744-683X

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