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SUMMARY:Strength development during consolidation in drying films - Alexan
 der F. Routh  CEB and BP Institute
DTSTART:20171115T140000Z
DTEND:20171115T150000Z
UID:TALK84721@talks.cam.ac.uk
CONTACT:Ian Wilson
DESCRIPTION:When a colloidal dispersion of rigid particles is spread as a 
 film and dried\, a number of transitions occur: The particles consolidate 
 at an edge and a solidification front is seen to traverse laterally across
  the film. This is closely followed by an array of cracks\, with well-defi
 ned crack spacing.\n\nThis talk will concentrate on why the cracks develop
  and how they propagate. The driving force for cracking is the capillary p
 ressure\, generated during the drying process. The resistance to cracking 
 is the material fracture toughness\, which transitions from a low value in
  the fluid to a final value in the fully developed solid. We show a method
  of measuring the film fracture toughness using confocal microscopy. It is
  found to scale with the particle size to the power of minus 0.8. In addit
 ion films created with low evaporation rates display higher fracture tough
 ness.\n\nFinally some recent work on the drying of polymeric colloids into
  gloves will be discussed and a process model to minimise energy usage wil
 l be introduced.\n
LOCATION:Department of Chemical Engineering and Biotechnology\, West Cambr
 idge Site\, LT1
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