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SUMMARY:The flow and rheology of graphene nanoparticles  - Catherine Kamal
 \, Univ. Cambridge
DTSTART:20211012T120000Z
DTEND:20211012T130000Z
UID:TALK162562@talks.cam.ac.uk
CONTACT:Camille Scalliet
DESCRIPTION:Liquid-based production and processing techniques of graphene 
 require graphene nanoparticles to be suspended in flowing liquids. Made fr
 om just a few atomic layers\, the instantaneous dynamics of these plate-li
 ke particles in flowing liquids is\, experimentally\, practically inaccess
 ible. We study theoretically and computationally the micro-hydrodynamics a
 nd rheology of dilute suspensions of graphene in a simple shear flow field
 . In the infinite Péclet number limit\, a rigid platelet with the interfa
 cial surface slip properties of graphene does not follow the periodic rota
 tions predicted for classical colloidal particles but aligns itself at a s
 mall inclination angle with respect to the flow. This unexpected result is
  due to the surface slip reducing the tangential stress at the graphene-so
 lvent surface. By analysing the Fokker-Plank equation for the orientationa
 l distribution function at all Péclet numbers\, we explore how surface sl
 ip affects the flow and rheology of graphene suspensions. We find that sur
 face slip can dramatically change the macroscopic behaviour of the suspens
 ion. For example\, the average orientation of a dilute suspension of plate
 lets is expected to increase for typical slip length values of graphene\, 
 and the effective viscosity of the suspension is predicted to drop signifi
 cantly. 
LOCATION:Center for Mathematical Sciences\, Lecture room MR11\, or https:/
 /maths-cam-ac-uk.zoom.us/j/98016675669
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