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SUMMARY:Powder impregnation and wetting of soluble coatings: two model pro
 blems to understand better powder dissolution
DTSTART:20121129T111500
DTEND:20121129T121500
DTSTAMP:20260428T175026Z
UID:da77945fc8e1514f54dc954b9ab80def2ef17399ae094136d1949c3f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Marco Ramaioli\, Nestlé Research Center\, Lausanne\nWhen 
 a powder is poured onto the surface of a solvent\, a complex interplay of 
 several phenomena conditions its dissolution. The reconstitution of a beve
 rage by pouring a soluble powder onto water represents a typical example.\
 nWe study this complex problem by simplifying it into several model proble
 ms.\nWe present first the study of the impregnation of non-soluble powder 
 layers at the surface of a liquid [1]\, showing the existence of a critica
 l contact angle below which spontaneous impregnation occurs. The effect of
  grain size distribution and forcing pressure is also discussed.\nWe then 
 introduce a second study\, characterizing the dynamic wetting of soluble c
 oatings of maltodextrin [2]. The effect of contact line velocity\, water c
 ontent and coating thickness is discussed.\nBy combining the results of th
 ese two studies\, we can derive an upper bound for the capillary impregnat
 ion rate in soluble powders\, a phenomenon which conditions strongly their
  dissolution performance
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STATUS:CONFIRMED
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