Unknotting of quasi-two-dimensional ferrogranular networks by in-plane homogeneous magnetic fields
| Autor: | Reinhard Richter, Justus Miller, Sofia S. Kantorovich, Pedro A. Sánchez |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
DIPOLAR HARD SPHERES
Field (physics) Susceptible dipolar hard spheres IRON ALLOYS Magnetic separation FOS: Physical sciences Field induced network unknotting 02 engineering and technology Condensed Matter - Soft Condensed Matter 01 natural sciences Viscoelasticity Ferrogranulate mixture LANGEVIN DYNAMICS Transient network PHASE SEPARATION 0103 physical sciences Perpendicular FIELD INDUCED 010302 applied physics Quenching Physics LANGEVIN DYNAMICS SIMULATION Condensed matter physics Plane (geometry) VISCOELASTICITY MIXTURES MAGNETIC SEPARATION 021001 nanoscience & nanotechnology Condensed Matter Physics Nonlinear Sciences - Adaptation and Self-Organizing Systems Electronic Optical and Magnetic Materials Magnetic field Amplitude Langevin dynamics simulations Viscoelastic phase separation Soft Condensed Matter (cond-mat.soft) MOLECULAR DYNAMICS 0210 nano-technology Adaptation and Self-Organizing Systems (nlin.AO) |
| Zdroj: | arXiv:1910.00317 [cond-mat.soft]: https://arxiv.org/abs/1910.00317 Journal of Magnetism and Magnetic Materials 499(2020), 166182 J Magn Magn Mater Journal of Magnetism and Magnetic Materials |
| Popis: | Our ongoing research addresses, by means of experiments and computer simulations, the aggregation process that takes place in a shaken granular mixture of glass and magnetized ferrous alloy beads when the shaking amplitude is suddenly decreased. After this quenching, the magnetized beads form a transient network that coarsens in time into compact clusters, following a viscoelastic phase separation. Here we focus on the quasi-two-dimensional case, analyzing in computer simulations the effects of a magnetic field parallel to the system plane. 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 suppressed, leading to the unknotting of the networks which are observed at zero field. Importantly, we found that moderate field strengths lead to the formation of larger clusters at intermediate time intervals than in the case of weak and strong fields. Moreover, the latter tend to limit the overall growth of the clusters at longer time scales. These results may be relevant in different systems governed by similar magnetically driven aggregation processes as, for example, in the formation of iron-rich planetesimals in protoplanetary discs or for magnetic separation systems. © 2019 Elsevier B.V. Research supported by the Russian Science Foundation Grant No. 19-12-00209 . Simulations were performed at the Vienna Scientific Cluster (VSC3). R.R. gratefully acknowledges I. Rehberg for supporting his attendance to ICMF19. |
| Databáze: | OpenAIRE |
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