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SUMMARY:Watching paint dry: Evaporation mediated self-assembly of nanopart
 icles - Alex Routh (BP Institute/Chemical Engineering &amp\; Biotechnology
 )
DTSTART:20101126T160000Z
DTEND:20101126T170000Z
UID:TALK27108@talks.cam.ac.uk
CONTACT:Dr C. P.  Caulfield
DESCRIPTION:When a stable colloidal dispersion dries a number of remarkabl
 e transformations occur. The first observation is that drying is non-unifo
 rm with fronts of close packed particles passing laterally across films. T
 his lateral drying results in fluid flow through consolidated particles an
 d a non-uniform capillary pressure across the film. Cracks can form becaus
 e of this capillary pressure and these follow the drying fronts with a cha
 racteristic staircase like progression. In certain circumstances the crack
 s are seen to oscillate. In addition any surfactant non-uniformities resul
 t in Marangoni instabilities and a characteristic set of islands in the fi
 lm topography.  This talk will describe the drying process and show where 
 we are in understanding the many stages that can occur.\n
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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