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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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