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DY: Fachverband Dynamik und Statistische Physik
DY 56: Poster: Glasses; Granular Matter; Brownian Motion and Anomalous Diffusion
DY 56.7: Poster
Donnerstag, 19. März 2020, 15:00–18:00, P1A
Unknotting of quasi-two-dimensional ferrogranular networks by in-plane homogeneous magnetic fields — Pedro A. Sanchez1,2, Justus Miller3, Sofia S. Kantorovich4, and •Reinhard Richter3 — 1Ural Federal Univ., 51 Lenin av., Ekaterinburg, 620000, Russian Federation — 2Inst. of Ion Beam Physics and Materials Research, H-Z Dresden-Rossendorf e.V., 01314 Dresden, Germany — 3Experimentalphysik 5, Univ. of Bayreuth, 95440 Bayreuth, Germany — 4Computational Physics, Univ. of Vienna, 1090 Vienna, Austria
We are exploring in experiments and computer simulations, the aggregation process in a shaken granular mixture of glass and magnetized steel beads, occuring after the shaking amplitude is suddenly decreased. Then the magnetized beads form a transient network that coarsens in time into compact clusters, following a viscoelastic phase separation [1]. Here we focus on the quasi-two-dimensional case, analyzing in computer simulation the effects of a magnetic field parallel to the system plane [2]. Our results evidence that the field drastically changes the structure of the forming network: chains and elongated clusters parallel to the field are favored whereas perpendicular connecting structures tend to be supressed, leading to the unknotting of the networks familiar from zero fields. By means of a field dependent orientation parameter we compare numerical and experimental results.
[1] A. Kögel, et al. Soft Matter, 14 (2018) 1001.
[2] P. A. Sánchez, J. Miller, S. S. Kantorovich, R. Richter, J. Magn. Magn. Mater, accepted (2019).