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SUMMARY:Novel in situ analysis using synchrotron and ab-initio simulations
  for nano-tribology 
DTSTART:20160310T141500
DTEND:20160310T160000
DTSTAMP:20260510T235154Z
UID:c511ab8a240769014dd17e2718f219b64c597927bf60e6b36b6e839e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Seiji Kajita\, Toyota Central R&D Labs.\, Inc.\nInstitute 
 of Nanoscience of CNR and Department of Physics Informatics and Mathematic
 s\, University of Modena and Reggio Emilia\, Italy\nBio : Seiji Kajita is 
 a researcher at Toyota Central R&D Labs.\, Inc. and a visiting researcher 
 at the Institute of Nanoscience of CNR\, Modena Italy\, dedicated to nano-
 tribology by using experiments and simulations collaborating with Dr. M. C
 . Righi. He completed his doctor degree in Physics at the Chiba University
  in 2007. His expertise is based on theoretical and computational condense
 d matter physics and surface science.\nControl of the tribological phenome
 na\, which involves friction and wear\, is still unattained because the ph
 ysical/chemical principles have not been fully elucidated due to the extre
 me difficulty to observe the sliding interface. Typically\, indirect analy
 sis has been carried out on samples after friction tests\, but this “ex-
 situ” approach merely derives indirect information from the sliding inte
 rface. To reveal the hidden interface\, we developed “in-situ” approac
 hes to clarify atomistic mechanisms of wear and tribochemical reaction. I 
 will present a new experiment that is able to record friction forces\, opt
 ical images of the sliding surface and X-ray diffraction spectra simultane
 ously by exploiting a synchrotron light source. The second part of this ta
 lk is dedicated to ab-initio calculations that elucidate fundamental aspec
 ts in the tribochemistry of diamond like carbon interacting with water. Mo
 reover\, I will introduce a developing methodology to couple the reactive 
 surface layer simulated by the ab-initio calculations with classical atoms
  described by semi-infinite dynamic lattice Green’s function (SI-DLGF). 
 The SI-DLGF atoms that represents an infinitely-large solid bulk reproduce
  phonon-energy dissipation properly\, which allows us to explore these non
 -equilibrium interfacial phenomena accurately.
LOCATION:ME D0 1418 http://plan.epfl.ch/?room=MED01418
STATUS:CONFIRMED
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