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

Regtmeier A-K, Wittbracht F, Rempel T, Mill N, Peter M, Weddemann A, Mattay J, Hütten A (2012)
Journal of Nanoparticle Research 14(8).

Journal Article | Published | English

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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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Regtmeier A-K, Wittbracht F, Rempel T, et al. Uniform growth of clusters of magnetic nanoparticles in a rotating magnetic field. Journal of Nanoparticle Research. 2012;14(8).
Regtmeier, A. - K., Wittbracht, F., Rempel, T., Mill, N., Peter, M., Weddemann, A., Mattay, J., et al. (2012). Uniform growth of clusters of magnetic nanoparticles in a rotating magnetic field. Journal of Nanoparticle Research, 14(8).
Regtmeier, A. - K., Wittbracht, F., Rempel, T., Mill, N., Peter, M., Weddemann, A., Mattay, J., and Hütten, A. (2012). Uniform growth of clusters of magnetic nanoparticles in a rotating magnetic field. Journal of Nanoparticle Research 14.
Regtmeier, A.-K., et al., 2012. Uniform growth of clusters of magnetic nanoparticles in a rotating magnetic field. Journal of Nanoparticle Research, 14(8).
A.-K. Regtmeier, et al., “Uniform growth of clusters of magnetic nanoparticles in a rotating magnetic field”, Journal of Nanoparticle Research, vol. 14, 2012.
Regtmeier, A.-K., Wittbracht, F., Rempel, T., Mill, N., Peter, M., Weddemann, A., Mattay, J., Hütten, A.: Uniform growth of clusters of magnetic nanoparticles in a rotating magnetic field. Journal of Nanoparticle Research. 14, (2012).
Regtmeier, Anna-Kristina, Wittbracht, Frank, Rempel, Thomas, Mill, Nadine, Peter, Michael, Weddemann, Alexander, Mattay, Jochen, and Hütten, Andreas. “Uniform growth of clusters of magnetic nanoparticles in a rotating magnetic field”. Journal of Nanoparticle Research 14.8 (2012).
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