Abstract
Using a novel protocol for mixing oppositely charged colloids and macromolecules, magnetic clusters and rods are fabricated using 10 nm-iron oxide nanoparticles and polymers. Here, we show that as the dispersions undergo the so-called desalting transition, spherical clusters in the range 100 nm – 1 μm form spontaneously upon dialysis or dilution. With a magnetic field applied during the dialysis, a one-dimensional growth of the aggregates is initiated, resulting in the formation of 1 – 100 μm rods of average diameter 200 nm. In this paper, we demonstrate that the nanostructured rods have inherited the properties of the iron oxide particles, namely to be superparamagnetic. We also discuss the dependence of the magnetic properties as a function of the nanoparticle diameter.
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Acknowledgement
We thank Jérôme Fresnais, Olivier Sandre and Régine Perzynski for fruitful discussions. The Laboratoire Physico-chimie des Electrolytes, Colloïdes et Sciences Analytiques (PECSA, Université Pierre et Marie Curie, Paris, France) is acknowledged for providing us with the nanoparticles and for the access to the TEM facilities. This research was supported by the Agence Nationale de la Recherche under the contract BLAN07-3_206866, by the European Community through the project : “NANO3T—Biofunctionalized Metal and Magnetic Nanoparticles for Targeted Tumor Therapy”, project number 214137 (FP7-NMP-2007-SMALL-1) and by the Région Ile-de-France (DIM project on Health, Environnement and Toxicology).
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Yan, M., Chevry, L., Berret, JF. (2010). Fabrication of Magnetic Clusters and Rods using Electrostatic Co-assembly. In: Trends in Colloid and Interface Science XXIII. Progress in Colloid and Polymer Science, vol 137. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-13461-6_8
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DOI: https://doi.org/10.1007/978-3-642-13461-6_8
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