Uniform growth of clusters of magnetic nanoparticles in a rotating magnetic field
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11051_2012_Article_1061.pdf
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Author(s)
Regtmeier, Anna
Wittbracht, Frank
Rempel, Thomas
Mill, Nadine
Peter, Michael
Weddemann, Alexander
Mattay, Jochen
Hütten, Andreas
Date Issued
July 2012
Journal
Journal of Nanoparticle Research
Publisher
Springer Netherlands
Citation
Regtmeier, Anna et al. “Uniform Growth of Clusters of Magnetic Nanoparticles in a Rotating Magnetic Field.” Journal of Nanoparticle Research 14.8 (2012): n. pag.
Version
Author's final manuscript
Abstract
It was recently shown that the exposure of magnetic microbeads to a homogeneous magnetic field, which rotates around the axis perpendicular to the field direction, generates highly ordered two-dimensional particle arrays. In this work, the impact of downscaling such systems is analyzed. Dilutions of cobalt nanoparticles with an average diameter of 6 nm were brought into a rotating homogeneous magnetic field. A strong localization of the number of particles within a certain cluster size can be observed if the rotation frequency is adjusted to a specific particle concentration. In particular, we obtain an increase of 85 % of the maximum of the cluster size distribution, when changing the rotation frequency of the magnetic field from 300 to 750 rpm for a cobalt concentration of 35.95 mmol/l. We propose a heuristic model to explain the observed frequency dependence.
MIT Department
Massachusetts Institute of Technology. Laboratory for Electromagnetic and Electronic Systems
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1007/s11051-012-1061-8
