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Issue 24, 2018
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Double origin of stochastic granular tribocharging

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Abstract

The mechanisms underlying triboelectric charging have a stochastic nature. We investigate how this randomness affects the distributions of charges generated on granular particles during either a single or many collisions. The charge distributions we find in our experiments are more heavy-tailed than normal distributions with an exponential decay of the probability, they are asymmetric, and exhibit charges of both signs. Moreover, we find a linear correlation between the width and mean of these distributions. We rationalize these findings with a model for triboelectric charging which combines stochastic charge separation during contact and stochastic charge recombination after separation of the surfaces. Our results further imply that subsequent charging events are not statistically independent.

Graphical abstract: Double origin of stochastic granular tribocharging

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Article information


Submitted
22 Mar 2018
Accepted
03 May 2018
First published
01 Jun 2018

This article is Open Access

Soft Matter, 2018,14, 4987-4995
Article type
Paper

Double origin of stochastic granular tribocharging

J. Haeberle, A. Schella, M. Sperl, M. Schröter and P. Born, Soft Matter, 2018, 14, 4987
DOI: 10.1039/C8SM00603B

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