Berlin 2015 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 62: Poster - Dynamics

DY 62.9: Poster

Donnerstag, 19. März 2015, 16:00–18:00, Poster A

Controlling electrical charges in granular matter — •André Schella, Matthias Schröter, and Stephan Herminghaus — Max-Planck Institut für Dynamik und Selbstorganisation (MPIDS), Am Faßberg 17, 37077 Göttingen

It is known since ancient times that two bodies rubbed together acquire electrostatic charges. Even though such charges can have a tremendous impact on e. g. industrial powder manufacturing and dust storms, the physical basis behind this process called contact electrification is still on open debate [1], [2]. Recently, Liao et al. [3] examined the influence of the shaking conditions on the electrostatic charge of identical beads in a container. There, it was argued that contact electrification is mainly due to a contact potential difference between the beads and the container walls, whereas other authors found electrification even in same materials [4]. In this contribution, we present charge measurements of identical beads that were vertically shaken in a container. We will work out if material properties of the beads resp. the container, the shaking conditions and the environmental conditions affect the charge gained via contact electrification. [1] L. McCarty and G. Whitesides; Angew. Chem. Int. Ed. 47 (2008) 2188 [2] D. Lacks and R. Sankaran; J. Phys. D: Appl. Phys. 44 (2011) 453001 [3] Liao et al.; Powder Technology 208 (2011) 1-6 [4] S. Waitukaitis et al.; Phys. Rev. Letters 112 (2014) 218001