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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1823
DTSTART:20110408T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T142835Z
LAST-MODIFIED:20110404T144709Z
LOCATION:2241 Chamberlin Hall (coffee at 3:30 pm)
SUMMARY:Beauty in Complexity: Low Friction and Adsorption Properties o
 f Quasicrystal Surfaces\, Physics Department Colloquium\, Pat Thiel\, 
 Iowa State University
DESCRIPTION:Quasicrystals are metallic alloys or intermetallics which 
 have an unconventional atomic structure. They are well-ordered on an a
 tomic scale\, but not periodic\, and they often exhibit so-called forb
 idden rotational symmetries. This atomic structure engenders unusual s
 urface properties and surface phenomena. Examples come from the morpho
 logy of films grown on quasicrystals. The unusual features include nuc
 leation at trap sites that are intrinsic to the surface structure\, an
 d a quantum size effect that drives the formation of mesa-like structu
 res. Another example is low friction\, which arises (at least in part)
  from the quasiperiodic atomic structure. Yet another example is the d
 evelopment of defect sites\, which can form at the surface and propaga
 te a defective stacking sequence in toward the bulk These unusual feat
 ures all are consequences of the beautiful - and sometimes maddeningly
  complex - atomic structure of these metallic alloys. 
URL:https://www.physics.wisc.edu/events/?id=1823
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