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SUMMARY:Contr. Talk 10 - Orientation distribution of cellulose nanofibrils
  and nanocrystals in channel flow
DTSTART;VALUE=DATE-TIME:20181211T143000Z
DTEND;VALUE=DATE-TIME:20181211T145000Z
DTSTAMP;VALUE=DATE-TIME:20260523T113233Z
UID:indico-contribution-494@lindico453.srv.lu.se
DESCRIPTION:Speakers: Tomas Rosen (Stony Brook University)\nNature has a r
 emarkable way of creating complex hierarchical nanostructures of cellulose
  nanofibrils (CNF) into various forms of trees and plants. Depending on lo
 cal environment\, evolution has tailored these structures over millions of
  years to enhance the particular species’ chances of survival. Learning 
 from nature\, we explore the possibility to tailor the properties of cellu
 lose materials materials to suit our needs by hydrodynamically aligning th
 e CNF and assembling them through controlled gelation and subsequent dryin
 g. The orientation distribution of CNF will depend on various parameters i
 ncluding flow properties such as deformation state (e.g. shear and extensi
 on) and flow rates as well as CNF properties such as fibril length distrib
 ution and concentration. In this work\, we study the orientation of CNF an
 d cellulose nanocrystals (CNC) in the shear layers of a channel flow using
  small angle X-ray scattering. The results are compared with simulations o
 f dilute anisotropic Brownian particles. Furthermore\, we demonstrate how 
 polarized microscopy can be used to estimate the orientation distribution 
 of these birefringent dispersions in the channel as well as determine thei
 r rotary diffusion rates. The results greatly enhance our understanding of
  CNF dynamics in flows\, which in turn can lead to new strategies in contr
 olling the structure of nanofibrous materials.\n\nhttps://lindico453.srv.l
 u.se/event/67/contributions/494/
LOCATION:Elite Hotel Ideon Tera
URL:https://lindico453.srv.lu.se/event/67/contributions/494/
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