Berlin 2015 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 67: Networks: From Topology to Dynamics (joint session DY/ BP/SOE)
DY 67.8: Vortrag
Freitag, 20. März 2015, 11:30–11:45, BH-N 128
Coarsening dynamics of transient networks in an experiment with dipolar hard spheres — •Armin Koegel and Reinhard Richter — Experimentalphysik 5, Universität Bayreuth, D-95440 Bayreuth, Germany
Permanent magnetic dipoles may self-assemble to linear chains and rings, even without an externally applied magnetic field. This has been investigated for nano-sized particles in ferrofluids; see e.g. [1,2] However, in this system the emerging structures and their dynamics are difficult to observe. Similar aggregates have also been observed in a mixture of glass beads and magnetized steel spheres, which are shaken in a vessel [3]. In the present contribution we focus on the formation of transient networks in this system, when quenching the amplitude of the vibrations [4]. We analyze the evolving networks by the number of spheres in a network cluster, its gyration radius, and its average shortest path length.
- P.G. De Gennes and A. Pincus, Phys. Kondens. Mater. 1, 189 (1970).
- T. A. Prokopieva, V. A. Danilov, S. S. Kantorovich, Ch. Holm, Phys. Rev. E 80, 031404 (2009).
- D. L. Blair, A. Kudrolli, Phys. Rev. E 67, 021302 (2003).
- http://www.ep5.uni-bayreuth.de/de/research/Magnetic-Soft-Matter/video/ferronetwork.html