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

dc.contributor.author

Schella, André

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Herminghaus, Stephan

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Schröter, Matthias

dc.date.accessioned

2020-02-18T21:52:17Z

dc.date.available

2020-02-18T21:52:17Z

dc.date.issued

2017-01

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2020-02-18T21:52:16Z

dc.description.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.

dc.identifier.issn

1744-683X

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1744-6848

dc.identifier.uri

https://hdl.handle.net/10161/20170

dc.language

eng

dc.publisher

Royal Society of Chemistry (RSC)

dc.relation.ispartof

Soft matter

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10.1039/c6sm02041k

dc.subject

Science & Technology

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Physical Sciences

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Technology

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Chemistry, Physical

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Materials Science, Multidisciplinary

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Physics, Multidisciplinary

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Polymer Science

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Chemistry

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Materials Science

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Physics

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CONTACT ELECTRIFICATION

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TRIBOELECTRIC SERIES

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ELECTROSTATIC DISCHARGE

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SURFACE MODIFICATION

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FORCE MICROSCOPY

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SOLID-SURFACES

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WATER

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POLYMERS

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SEPARATION

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INTERFACES

dc.title

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

dc.type

Journal article

duke.contributor.orcid

Schroter, Matthias|0000-0002-8332-5585

pubs.begin-page

394

pubs.end-page

401

pubs.issue

2

pubs.organisational-group

Trinity College of Arts & Sciences

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Duke

pubs.publication-status

Published

pubs.volume

13

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