Electrostatic Charging Due to Separation of Ions at Interfaces: Contact Electrification of Ionic Electrets

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Original entry: Tamas Szalay (APPHY225 2012)

"Electrostatic Charging Due to Separation of Ions at Interfaces: Contact Electrification of Ionic Electrets"

Logan S. McCarty and George M. Whitesides

Angew. Chem. Int. Ed. 2008, 47, 2188 – 2207


Summary

An electret is the electrostatic cousin of a permanent magnet: a material with a permanent charge at the surface, either due to a static charge or a dipole moment. An ionic electret is defined to be an electret where the net charge is due to a difference in anionic and cationic concentrations at the surface; when two are brought in contact, ionic exchange can occur, and this can produce a net transfer of charge. This article examines the theoretical and experimental evidence for the mechanism by which these charge transfers occur, and uses this to propose a model for the ubiquitous static electricity behavior of organic polymers.


Soft matter keywords

Charge seperation, dispersion force, static electricity, electret

Physics of Writing

Experimental Results