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Uniform growth of clusters of magnetic nanoparticles in a rotating magnetic field

Journal of Nanoparticle Research volume 14, Article number: 1061 (2012) Cite this article

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.

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Acknowledgments

The authors would like to thank the SFB 613 and the FOR 945 for financial support in the framework of the project K3 and project 3, respectively. Alexander Weddemann gratefully acknowledges financial funding from the Alexander von Humboldt foundation.

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Affiliations

  1. Thin Films and Physics of Nanostructures, Department of Physics, Bielefeld University, PB 100131, 33501, Bielefeld, Germany

    Anna Regtmeier, Frank Wittbracht, Thomas Rempel, Nadine Mill & Andreas Hütten

  2. Laboratory for Electromagnetic and Electronic Systems, Massachusetts Institute of Technology, 77 Mass Avenue, Cambridge, MA, 02139, USA

    Alexander Weddemann

  3. Organic Chemistry I, Department of Chemistry, Bielefeld University, PB 100131, 33501, Bielefeld, Germany

    Michael Peter & Jochen Mattay

Authors
  1. Anna Regtmeier
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  2. Frank Wittbracht
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  3. Thomas Rempel
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  4. Nadine Mill
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  5. Michael Peter
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  6. Alexander Weddemann
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  7. Jochen Mattay
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  8. Andreas Hütten
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Correspondence to Frank Wittbracht.

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Regtmeier, A., Wittbracht, F., Rempel, T. et al. Uniform growth of clusters of magnetic nanoparticles in a rotating magnetic field. J Nanopart Res 14, 1061 (2012). https://doi.org/10.1007/s11051-012-1061-8

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  • DOI: https://doi.org/10.1007/s11051-012-1061-8

Keywords

  • Magnetism
  • Nanoparticles
  • Assembly
  • Growth mechanism
  • Agglomerates