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DTSTART:20180325T030000
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DTSTART:20171029T020000
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DTSTAMP:20260424T102258Z
UID:5a4ccecfededa014901791@ist.ac.at
DTSTART:20180227T090000
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DESCRIPTION:Speaker: Scott Waitukaitis\nhosted by Björn Hof\nAbstract: If 
 you shuffle your feet across a carpet and touch a doorknob\, you might get
  shocked.  This is tribocharging--the transfer of electrical charge betwee
 n different materials.  Although it was observed to occur even in ancient 
 Greece\, we know surprisingly little about it.  One of the most perplexing
  observations is that objects of the same material\, when rubbed together\
 , still exchange charge in a systematic way.  This is especially prevalent
  in granular systems\, where grains are in constant frictional contact.  I
 nspired by Millikan's oil drop experiment\, I will describe experiments th
 at aim to understand where this charging comes from.  Using a free-fall se
 tup\, we work in a zero gravity environment and precisely measure grain ch
 arges\, which allows us to test the prevailing theory for how charge trans
 fer occurs.  We also witness a zoology of dynamic behaviors arising from c
 harged interactions\, including attractive orbits and repulsive slingshot 
 events\, cluster growth via capture\, and cluster annihilation via impact.
  These results have important implications in for both the origin of same-
 material tribocharging and the resulting consequences in a wide variety of
  natural systems.
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:pdelreal@ist.ac.at
SUMMARY:Scott Waitukaitis: Rabbits\, planets\, volcanoes\, dust devils: the
  surprising physics of granular tribocharging
URL:https://talks-calendar.ista.ac.at/events/1088
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