Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Particulate Matter: From microscopic interactions to collective motion (joint session DY/CPP)
DY 29.4: Vortrag
Dienstag, 13. März 2018, 14:45–15:00, EB 107
Stochastic Nature of Granular Tribocharging — •Jan Haeberle1, André Schella2, Matthias Schröter2, Matthias Sperl1, and Philip Born1 — 1Deutsches Zentrum für Luft-und Raumfahrt, Köln, Deutschland — 2MPI Dynamics and Self-Organization, Göttingen, 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]. Triboelectric charging has also been linked to segregation [2] and suggested as a tool for structure formation in granular media [2,3]. Recently, the stochastic nature of the triboelectric charging process has become apparent [4]. To further investigate the stochastics of tribocharging, we have studied the distribution resulting after a tribocharging event in a custom-made Faraday cup setup. We measure non-Gaussian asymmetric charge distributions. We find, that we can describe the measured distributions by a model combining a distinct stochastic charging and stochastic discharging process.
[1] Duran, J., Sands, Powders, and Grains, Springer, New York (2000) [2] Schella, A., Herminghaus, S. & Schröter, M., Soft Matter 13, 394-401 (2017). [3] Cademartiri, R. et al., Soft Matter 8, 9771 (2012). [4] Apodaca, M. M., Wesson, P. J., Bishop, K. J. M., Ratner, M. A. & Grzybowski, B. A., Angewandte Chemie 122, 958-961 (2010).