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We study the effect of humidity on the charge accumulation of polymergranulates shaken vertically in a stainless steel container. The setup allowsto control the humidity level from 5 % to 100 %RH while performing automatedcharge measurements in a Faraday cup directly connected to the shakingcontainer. We find that samples of approximately 2000 polymer spheres becomehighly charged at low humidity levels (<30 %RH), but acquire almost no chargefor humidity levels above 80 %RH. The transition between these two regimes doesdepend on the material, as does the sign of the charge. For the latter we finda correlation with the contact angle of the polymer with only very hydrophilicparticles attaining positive charges. We show that this humidity dependence oftribo-charging can be used to control segregation in shaken binary mixtures.

Influence of humidity on the tribo-electric charging and segregation in shaken granular media