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Issue 2, 2017
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Influence of humidity on tribo-electric charging and segregation in shaken granular media

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Abstract

We study the effect of humidity on the charge accumulation of polymer granulates shaken vertically in a stainless steel container. This setup allows us to control the humidity level from 5% to 100%RH while performing automated charge measurements in a Faraday cup directly connected to the shaking container. We find that samples of approximately 2000 polymer spheres become highly charged at low humidity levels (<30%RH), but acquire almost no charge for humidity levels above 80%RH. The transition between these two regimes does depend on the material, as does the sign of the charge. For the latter we find a correlation with the contact angle of the polymer with only very hydrophilic particles attaining positive charges. We show that this humidity dependence of tribo-charging can be used to control segregation in shaken binary mixtures.

Graphical abstract: Influence of humidity on tribo-electric charging and segregation in shaken granular media

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Publication details

The article was received on 06 Sep 2016, accepted on 04 Dec 2016 and first published on 05 Dec 2016


Article type: Paper
DOI: 10.1039/C6SM02041K
Citation: Soft Matter, 2017,13, 394-401
  • Open access: Creative Commons BY license
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    Influence of humidity on tribo-electric charging and segregation in shaken granular media

    A. Schella, S. Herminghaus and M. Schröter, Soft Matter, 2017, 13, 394
    DOI: 10.1039/C6SM02041K

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