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Author Kamal, C.; Gravelle, S.; Botto, L. doi  openurl
  Title Hydrodynamic slip can align thin nanoplatelets in shear flow Type Journal Article
  Year 2020 Publication (up) Nature Communications Abbreviated Journal Nat. Commun.  
  Volume 11 Issue 1 Pages 10 pp  
  Keywords  
  Abstract The large-scale processing of nanomaterials such as graphene and MoS2 relies on understanding the flow behaviour of nanometrically-thin platelets suspended in liquids. Here we show, by combining non-equilibrium molecular dynamics and continuum simulations, that rigid nanoplatelets can attain a stable orientation for sufficiently strong flows. Such a stable orientation is in contradiction with the rotational motion predicted by classical colloidal hydrodynamics. This surprising effect is due to hydrodynamic slip at the liquid-solid interface and occurs when the slip length is larger than the platelet thickness; a slip length of a few nanometers may be sufficient to observe alignment. The predictions we developed by examining pure and surface-modified graphene is applicable to different solvent/2D material combinations. The emergence of a fixed orientation in a direction nearly parallel to the flow implies a slip-dependent change in several macroscopic transport properties, with potential impact on applications ranging from functional inks to nanocomposites. Current theories predict that a plate-like particle rotates continuously in a shear flow. Kamal et al. instead show that even nanometric hydrodynamic slip may induce a thin plate-like particle to adopt a stable orientation, and discuss implications of this effect for flow processing of 2D nanomaterials.  
  Address [Kamal, Catherine; Gravelle, Simon; Botto, Lorenzo] Queen Mary Univ London, Sch Engn & Mat Sci, London, England, Email: l.botto@tudelft.nl  
  Corporate Author Thesis  
  Publisher Nature Publishing Group Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2041-1723 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000536569900023 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1195  
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