Publikation:

Glass transition in a two-dimensional system of magnetic colloids

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2004

Autor:innen

Zahn, Klaus

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http://nbn-resolving.de/urn:nbn:de:bsz:352-172964
DOI (zitierfähiger Link)
https://doi.org/10.1063/1.1764057
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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.

Zusammenfassung in einer weiteren Sprache

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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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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