Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 39: Particulate Matter II: From microscopic interactions to collective motion (Focus session)
DY 39.3: Vortrag
Mittwoch, 22. März 2017, 15:45–16:00, ZEU 118
Triboelectric charging of surface treated granular media — •Jan Haeberle1, André Schella2, Matthias Schröter3, Matthias Sperl1, and Philip Born1 — 1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft-und Raumfahrt, 51170 Köln, Germany — 2MPI Dynamics and Self-Organization, Am Fassberg 17, 37077 Göttingen, Germany — 3Institute for Multiscale Simulation, Nägelsbachstrasse 49b, 91052 Erlangen, Germany
Triboelectric charging of granular media has important consequences for the bulk behaviour. Effects such as powder flowability or cluster formation due to charging are everyday experiences [1]. Recently, triboelectric charging has also been linked to segregation [2] and suggested as a tool for structure formation in granular media [2,3]. In order to change charging behaviour and contact angle, we applied surface treatments to glass beads (d=0.5mm). We study the effect of these treatments in a custom-made Faraday cup setup, that allows the automated measurement of hundreds of individual particles over time periods of hours. In addition, we can control the humidity in a climate chamber to study the effect of water layers on the charging behaviour. We show that we can indeed measure the charge distribution, which can be tuned by surface treatment.
[1] Duran, J., Sands, Powders, and Grains, Springer, New York (2000)
[2] Schella, A. et al., arXiv:1609.04639 (2016)
[3] Cademartiri, R. et al., Soft Matter 8, 9771 (2012)