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CATEGORIES:Chemical Engineering and Biotechnology Departmenta
 l Seminars
SUMMARY:Strength development during consolidation in dryin
 g films - Alexander F. Routh  CEB and BP Institute
DTSTART;TZID=Europe/London:20171115T140000
DTEND;TZID=Europe/London:20171115T150000
UID:TALK84721AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/84721
DESCRIPTION:When a colloidal dispersion of rigid particles is 
 spread as a film and dried\, a number of transitio
 ns occur: The particles consolidate at an edge and
  a solidification front is seen to traverse latera
 lly across the film. This is closely followed by a
 n array of cracks\, with well-defined crack spacin
 g.\n\nThis talk will concentrate on why the cracks
  develop and how they propagate. The driving force
  for cracking is the capillary pressure\, generate
 d during the drying process. The resistance to cra
 cking is the material fracture toughness\, which t
 ransitions from a low value in the fluid to a fina
 l value in the fully developed solid. We show a me
 thod of measuring the film fracture toughness usin
 g confocal microscopy. It is found to scale with t
 he particle size to the power of minus 0.8. In add
 ition films created with low evaporation rates dis
 play higher fracture toughness.\n\nFinally some re
 cent work on the drying of polymeric colloids into
  gloves will be discussed and a process model to m
 inimise energy usage will be introduced.\n
LOCATION:Department of Chemical Engineering and Biotechnolo
 gy\, West Cambridge Site\, LT1
CONTACT:Ian Wilson
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