Glass transition in a two-dimensional system of magnetic colloids

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2004
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AIP Conference Proceedings. AIP, 2004, pp. 40-45. eISSN 0094-243X. Available under: doi: 10.1063/1.1764057
Zusammenfassung

We describe experiments on binary mixtures of superparamagnetic colloidal particles confined by gravity to a flat horizontal water-air interface. The colloids repel each other because of their magnetic dipole moments induced by a vertical external magnetic field B. By tuning B, the effective temperature of the system can be adjusted over several orders of magnitude. Particle coordinates are monitored by video-microscopy over more than five decades in time. Measured radial pair-distribution functions g(r) and mean-square displacements illustrate that this system is an ideal model of a two-dimensional (2D) glass former. We find that the effects of small amounts of aggregated particles only weakly affect the averaged structure and dynamics. Locally, a small number of elementary structural elements are observed each characterized by a special triangular shape. These triangles arrange in dense mostly space-filling arrays and account for the essential features of g(r). The long-time α-relaxation is related to drifts of arrays as well as erosion due to single particle and collective hopping events.

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Fachgebiet (DDC)
530 Physik
Schlagwörter
Colloids, Glass transitions, Solids, composites, glasses, semicrystalline polymers
Konferenz
SLOW DYNAMICS IN COMPLEX SYSTEMS: 3rd International Symposium on Slow Dynamics in Complex Systems, Sendai (Japan)
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Zitieren
ISO 690KÖNIG, Hans, Klaus ZAHN, Georg MARET, 2004. Glass transition in a two-dimensional system of magnetic colloids. SLOW DYNAMICS IN COMPLEX SYSTEMS: 3rd International Symposium on Slow Dynamics in Complex Systems. Sendai (Japan). In: AIP Conference Proceedings. AIP, 2004, pp. 40-45. eISSN 0094-243X. Available under: doi: 10.1063/1.1764057
BibTex
@inproceedings{Konig2004Glass-17296,
  year={2004},
  doi={10.1063/1.1764057},
  title={Glass transition in a two-dimensional system of magnetic colloids},
  publisher={AIP},
  booktitle={AIP Conference Proceedings},
  pages={40--45},
  author={König, Hans and Zahn, Klaus and Maret, Georg}
}
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