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SUMMARY:Drying droplets: coffee stains and Mexican hats - David Fairhurst\
 , Nottingham Trent University
DTSTART:20141113T113000Z
DTEND:20141113T123000Z
UID:TALK54620@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:As suspension droplets lose their solvent through evaporation\
 , the particles left behind are deposited into distinctive "dry out" patte
 rns on the surface. Although uncontrolled experiments are simple to perfor
 m\, there are many parameters to consider making a priori predictions diff
 icult. To illustrate this I will present experimental results from two sys
 tems of drying droplets: (1) particle suspensions and (2) polymer solution
 s. Dilute particle suspensions typically form ring-stains\, the dimensions
  of which are found to be robustly predicted by established scaling laws o
 ver a wide range of experimental parameters: particle size\, concentration
 \, orientation and drying rate. By contrast\, the dry out patterns from po
 lymer solutions are seen to be sensitively dependent on the underlying pha
 se behaviour of the polymer\, with significant differences observed betwee
 n semi-crystalline and glass-forming polymers. The polymer results have le
 d us to identify alternative evaporation behaviours for droplets on surfac
 es\, which seem to be supported by literature.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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