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SUMMARY:Efficient mass transport under continuous and discontinuous graphi
 tic confinement
DTSTART:20160915T160000
DTEND:20160915T170000
DTSTAMP:20260412T091834Z
UID:1cd2456b9a28ae64569551131e10b6dc242af215d52837720cbbf078
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Hyung Gyu Park\nDepartment of Mechanical and Process Eng
 ineering\, ETH Zurich\nEfficient mass transport inside and across nanoscal
 e graphitic surfaces such as carbon nanotubes and graphene\, respectively\
 , forms the basis of aqueous "carbon nanofluidic" phenomena for which ther
 e are numerous applications in energy and clean technologies. These unique
  phenomena of nanoscale mass transport has been actively pioneered\, and s
 till many questions remain unanswered such as "how fast is fast ?" In this
  talk\, we will first review briefly the nanofluidics of fast water transp
 ort in carbon nanotubes and across graphene. Following\, we will present o
 ur story of water transport measured under these graphitic nanoconfinement
 s. A new scaling for comparing flow enhancement factors in carbon nanotube
 s will be proposed and discussed. This scaling can reconcile the apparent 
 disagreement between simulations and experiments about how fast water can 
 flow in carbon nanotubes.\nNearly frictionless flows established in carbon
  nanotubes lead to a question of ultimate permeation speed if one recogniz
 es that having a friction-minimized pore could be equivalent to having no 
 pore wall but only openings. To address this question\, graphene serves as
  a material of choice for its great mechanical strength. We designed and m
 anufactured a porous graphene membrane by direct physical perforation (foc
 used ion beam milling) of freestanding double-layer graphene. When driven 
 by pressure\, the values of water permeance across this 2D membrane exceed
  that of any membrane material of the similar pore sizes and approach Samp
 son's formula - a theorectical prediction of the ultimate rate of a pressu
 rized flow across a 2D disk
LOCATION:Zeuzier https://www.google.com/maps/place/EPFL+Valais+Wallis/?ref
 =zeuzier
STATUS:CONFIRMED
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