Dresden 2020 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 33: Granular Matter and Granular Dynamics I

DY 33.5: Talk

Wednesday, March 18, 2020, 10:45–11:00, ZEU 118

Pauling Structures in Tribocharged Granular Media — •Philip Born, Jan Haeberle, and Matthias Sperl — Institut für Materialphysik im Weltraum, DLR e.V., Linder Höhe, 51147 Köln

Ordered, non-densest packings of granular particles are rarely observed. The hard core and the frictional contacts of the particles impose disordered packings, or, under suitable conditions like mobilization and small size dispersity of the particles, ordered densest packings with hexagonal symmetry. However, we could show that binary packings of granular particles with strong tribocharging take BCC-like packing structures under suitable conditions [1]. The observed packing behavior is to large extent in agreement with the prediction of Pauling's rules for ionic crystals, i.e., equilibrium structures of thermal ions. Here we want to discuss the observation that the Pauling structure is only observed in an incommensurate container, which may give a hint on the rules how granular media take equilibrium structures with suitable mobilization.

[1] J. Haeberle, J. Harju, M. Sperl and P. Born, "Granular ionic crystals in a small nutshell", Soft Matter 15, 7179-7186 (2019).