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Volume 181, 2015
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Concentrated assemblies of magnetic nanoparticles in ionic liquids

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Abstract

Maghemite (γ-Fe2O3) nanoparticles (NPs) can be successfully dispersed in a protic ionic liquid, ethylammonium nitrate (EAN), by transfer from aqueous dispersions into EAN. As the aqueous systems are well controlled, several parameters can be tuned. Their crucial role towards the interparticle potential and the structure of the dispersions is evidenced: (i) the size of the NPs tunes the interparticle attraction monitoring dispersions to be either monophasic or gas–liquid-like phase separated; (ii) the nature of the initial counterion in water (here sodium, lithium or ethylammonium) and the amount of added water (<20 vol%) modulate the interparticle repulsion. Very concentrated dispersions with a volume fraction of around 25% are obtained thanks to the gas–liquid-like phase separations. Such conclusions are derived from a fine structural and dynamical study of the dispersions on a large range of spatial scales by coupling several techniques: chemical analyses, optical microscopy, dynamic light scattering, magneto-optic birefringence and small angle scattering.

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Submitted
09 Feb 2015
Accepted
16 Feb 2015
First published
17 Feb 2015

Faraday Discuss., 2015,181, 193-209
Article type
Paper
Author version available

Concentrated assemblies of magnetic nanoparticles in ionic liquids

M. Mamusa, J. Sirieix-Plénet, R. Perzynski, F. Cousin, E. Dubois and V. Peyre, Faraday Discuss., 2015, 181, 193
DOI: 10.1039/C5FD00019J

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