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

Schella, A., Herminghaus, S., & Schröter, M. (2017). Influence of humidity on tribo-electric charging and segregation in shaken granular media. Soft Matter, 13(2), 394-401. doi:10.1039/C6SM02041K.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-25D9-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-1CB3-6
Genre: Journal Article

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 Creators:
Schella, André1, Author              
Herminghaus, Stephan2, Author              
Schröter, Matthias3, Author              
Affiliations:
1Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063299              
2Group Granular matter and irreversibility, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063306              
3Group Statistical mechanics of granular media, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063310              

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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.

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Language(s): eng - English
 Dates: 2016-12-052017-01-14
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1039/C6SM02041K
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Title: Soft Matter
Source Genre: Journal
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Pages: - Volume / Issue: 13 (2) Sequence Number: - Start / End Page: 394 - 401 Identifier: ISSN: 1744-683X