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SUMMARY:IMX Talks - Seeing the Hidden Interface: Revealing Nanoscale Mecha
 nisms of Contact\, Adhesion\, and Wear by in situ Experiments
DTSTART:20250605T093000
DTEND:20250605T103000
DTSTAMP:20260921T204406Z
UID:8f9b85894a75ffd236cbefc1fcf04e09853cf0a8bfa7302093bb1171
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Robert Carpick\, University of Pennsylvania\, USA\nAs te
 chnology scales shrink\, tribology plays an increasingly dominant role. Th
 is can be problematic (e.g.\, high friction and wear in micro/nano devices
 )\, or advantageous (e.g.\, using adhesion to drive nanostructure formatio
 n). The biggest challenge in exploring and exploiting these issues is that
  the interface between two materials is hidden from view. Recent advances 
 in in situ methods have enabled tribological mechanisms at previously inac
 cessible interfaces to be studied with unprecedented resolution. I will di
 scuss new science revealed by in situ experimental methods to develop phys
 ically-based insights into tribological processes.\n\nFirst\, I will discu
 ss the use of crystalline metal oxide nanoparticles to prevent damage in h
 arsh environment mechanical applications. Metal oxides powders typically r
 equire temperatures >1000° C to coalesce into dense solids. Remarkably\, 
 metal oxide nanocrystals\, including ZrO2 and TiO2\, dispersed in lubrican
 ts can sinter at room temperature due to tribological stresses (compressio
 n and frictional shear) in a process known as tribosintering. In this proc
 ess\, the nanoparticles forming solid\, surface-bound films that we call t
 ribocoatings. We show for the first time that such tribocoatings prevent w
 ear and other common tribological failure mechanisms under a wide range of
  harsh conditions.\n\nSecond\, new insights into nanoscale adhesion and we
 ar are achieved using in situ transmission electron microscopy (TEM) wear 
 tests. A strong\, reversible\, sliding-history dependence of adhesion betw
 een silicon nanoasperities occurs\, attributed to shear-induced removal of
  adsorbates. I will also preview new results applying the technique to stu
 dy contact between two-dimensional materials including MoS2.\n\nBio: Rober
 t Carpick is the John Henry Towne Professor of Mechanical Engineering and 
 Applied Mechanics at the University of Pennsylvania. He studies nanotribol
 ogy\, nanomechanics\, scanning probes\, and mechanochemistry. He is a reci
 pient of the AVS Nanotechnology Recognition Award\, the American Society o
 f Mechanical Engineers (ASME) Newkirk Award\, a R&D 100 award\, and a NSF 
 CAREER Award. He is a Fellow of the ASME\, the American Physical Society\,
  the Materials Research Society\, the AVS\, and the Society of Tribologist
 s and Lubrication Engineers. He holds 10 patents and has authored over 200
  peer-reviewed publications. Before joining UPenn in 2007\, he was a facul
 ty member at the University of Wisconsin-Madison. He received his B.Sc. (U
 . Toronto\, 1991) and his Ph.D. (U. California at Berkeley\, 1997) in Phys
 ics\, and was a postdoctoral researcher at Sandia National Laboratory. He 
 served as Department Chair from 2011-2019\, and since 2020 serves as the D
 irector of Diversity\, Equity\, and Inclusion and now Director of Broader 
 Impact for his Department.\n\n\n\n 
LOCATION:CM 1 4 https://plan.epfl.ch/?room==CM%201%204 https://epfl.zoom.u
 s/j/67296154951
STATUS:CONFIRMED
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