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BEGIN:VEVENT
DTSTAMP:20260428T062904Z
DTSTART;VALUE=DATE-TIME:20180219T130000
DTEND;VALUE=DATE-TIME:20180219T140000
SUMMARY:Gianpietro Moras (Fraunhofer IWM)
TZID:Europe/London
UID:20180219-8a17841a6012ba7a01606a7299256136@warwick.ac.uk
CREATED:20171218T162623Z
DESCRIPTION:Tribology of diamond and silicon: atomic-scale insights from 
 computers simulations Tribological processes involving diamond and silic
 on are very common in technology. Chemical-mechanical polishing of diamo
 nd films and their ultralow friction in presence of water\, wear of diam
 ond-coated cutting tools\, multi-wire sawing of silicon for photovoltaic
  applications\, wear of MEMS and atomic force microscopy tips are just a
  few examples. In all these processes\, friction and wear are strongly i
 nfluenced by material transformations that are not fully understood as t
 hey occur at buried interfaces and are hardly accessible by in situ expe
 riments. In this seminar I will present the results of atomic-scale comp
 uter simulations that contribute to shed light on the tribological evolu
 tion of these two crystals. Interestingly\, in spite of their common cry
 stal structure and brittle behaviour\, diamond and silicon can respond i
 n completely different ways to tribological loads. First\, I will show h
 ow both diamond and silicon can undergo shear-induced amorphization. The
  pressure-dependence of the amorphization rates is however opposite in t
 he two materials. This is due to the opposite volume change upon shear-i
 nduced amorphization: carbon expands while silicon becomes denser. This 
 can be related to the opposite slopes of the melting curves of diamond a
 nd diamond cubic silicon in their pressure-temperature phase diagram. Fi
 nally\, I will present atomic-scale mechanisms for ultralow friction in 
 water-lubricated diamond. It is known that water dissociative chemisorpt
 ion can lead to surface passivation and low friction in both diamond and
  silicon. Our simulations show that water can also induce aromatic surfa
 ce reconstructions that are responsible for ultralow friction in diamond
  and diamond-like carbon.
LOCATION:Physical Sciences (PS0.17)
CATEGORIES:
LAST-MODIFIED:20171218T162846Z
ORGANIZER;CN=Peter Brommer:
END:VEVENT
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