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DTSTAMP:20260404T053036Z
UID:5d81f7bd5c8f8091332173@ist.ac.at
DTSTART:20190920T153000
DTEND:20190920T170000
DESCRIPTION:Speaker: Adam Collins\nhosted by Scott Waitukaitis\nAbstract: S
 ince the ancient Greeks rubbed fur on amber to attract objects ~2\,500 yea
 rs ago\, many prominent scientists have studied triboelectrification: the 
 observed exchange of charge when materials are brought into contact. With 
 such a long history of study\, one might assume triboelectrification is a 
 solved problem of science. However\, itstill remains as little more than a
 n observed effect\, with no fundamental theory of how much charge\, or eve
 n what charge species\, will be exchanged between 2 materials in contact. 
 When scotch tape is peeled in a vacuum\, 40 keV X-rays are readily generat
 ed from sub-mm regions in < ns bursts from the resultant static charge. Ho
 w can diffuse\, macroscopic mechanical action concentrate to highly energe
 tic photons emitted from microscopic regions? What theory allows for the t
 ransfer of > 10^12 unit charges per cm^2 through mechanical action alone? 
 More simply\, what causes charge to move between insulating materials at a
 ll?Triboelectric X-rays (TEX-rays) are more than a party trick: they provi
 de us with a diagnostic tool that shows the true scale of triboelectrifica
 tion\, opening up measurements at previously unreachable scales. We presen
 t experimental data on triboelectrification of single crystal materials\, 
 and propose theory that incorporates modern understanding of surface- and 
 interface-physics into the few understood aspects of triboelectrification:
  specifically\, that the latent polarization of a reconstructed surface pr
 ovides the electrical instability required to begin the triboelectric char
 ging process\, with charge mobility provided via the diffuse double-layer 
 of an adsorbed liquid.
LOCATION:Heinzel Seminar Room / Office Bldg West (I21.EG.101)\, ISTA
ORGANIZER:boosthui@ist.ac.at
SUMMARY:Adam Collins: Scratching the Surface of Triboelectrification with T
 riboluminescence
URL:https://talks-calendar.ista.ac.at/events/2167
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