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VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Tribology from the point of view of individual atoms
DTSTART:20111021T110000
DTSTAMP:20260916T235628Z
UID:969edd9e410670dc297fcece40e848e1505a0c20d6d66836e7f65b26
CATEGORIES:Conferences - Seminars
DESCRIPTION:Bernd Gotsmann\nEndurance requirements in emerging probe techn
 ologies  such as probe-based data storage and lithography  are extremely d
 emanding. Tip lifetime has been viewed as an unsolved critical issue in th
 is context. \n\nWe show  that on the nanoscale the complexity of wear can 
 be simplified to a thermally activated bond breaking process in which the 
 energy barrier is reduced by the frictional shear stress. The resulting at
 om-by-atom wear deviates strongly from macroscopic wear behavior. Model pr
 edictions agree well with wear data obtained using sharp tips sliding in c
 ontact with various surfaces at sliding distances up to hundreds of meters
 . Wear data obtained using different tip materials is compared. Specifical
 ly  we used tips made from silicon  diamond-like carbon  and silicon carbi
 de.\n\nTo obtain a deeper understanding of the atomistic arrangement in a 
 nanoscale contact we use heat transfer between a tip and a surface to test
  atomistic models of true contact areas between contacting surfaces with a
 tomic scale roughness. Our data is consistent with a ballistic thermal tra
 nsport across individual atom-atom contacts distributed at the interface.
LOCATION:GC D0 386
STATUS:CONFIRMED
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