Journal
JOURNAL OF ELECTROSTATICS
Volume 65, Issue 2, Pages 107-112Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.elstat.2006.07.010
Keywords
triboelectric; insulators; granular
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Triboelectric charging occurs in granular insulating systems even when all particles are composed of identical material. A simple model is used here to address triboelectric charging in such systems. The basis of the model is the existence of electrons trapped in high-energy states, which can be released during collisions with another particle and transferred to the other particle. This model shows that triboelectric charging in insulator systems composed of particles of identical material can be attributed to a distribution of particle sizes, such that smaller particles tend to charge negatively and larger particles tend to charge positively. This polarity of charging has been observed in field studies of sand storms, dust devils and volcanic plumes, and most laboratory experiments on triboelectric charging in granular systems. (c) 2006 Elsevier B.V. All rights reserved.
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