SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 7: Granular Matter and Contact Dynamics
DY 7.5: Vortrag
Montag, 27. März 2023, 11:00–11:15, ZEU 148
Phase space characterization of three-dimensional nucleation of glass spheres — •Frank Rietz1,2 and Matthias Schröter2 — 1University of Magdeburg, Department of Nonlinear Phenomena — 2Max Planck Institute for Dynamics and Self-Organization (MPIDS), Göttingen
Packings of macroscopic spheres serve as a model system for studying atomic states. In many compactification protocols, the spheres do not form nuclei and remain in the state of random close packing. By cyclically shearing a packing of 50000 spheres, we can cross this boundary and observe a transition from a disordered to a crystallized state [1]. The three-dimensional temporal positions of the spheres are tracked by refractive index-matched scanning [2]. The description of disordered states and the nature of random close packing are open scientific problems. In our case, we describe the nucleation process by partitioning the packing into local groups of four touching spheres. These groups of spheres are tracked during the crystallization process and their contacts and relative orientation are recorded in a phase space diagram. By comparing the states before and after crystallization with the states that avoid crystallization, we show whether there are conditions under which the spheres statistically tend to crystallize.
[1] F. Rietz, C. Radin, H. L. Swinney, M. Schröter: Nucleation in sheared granular matter, Phys. Rev. Lett. 120, 055701 (2018)
[2] J. A. Dijksman, F. Rietz, K. A. Lőrincz, M. van Hecke, W. Losert: Refractive index matched scanning of dense granular materials, Rev. Sci. Instrum. 83, 011301 (2012)