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SUMMARY:Buckling of a fast drying drop of particle suspension - Mahesh Tir
 umkudulu\, IIT Bombay
DTSTART:20230601T103000Z
DTEND:20230601T113000Z
UID:TALK201913@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Fast evaporation of particle-suspension drops results in compl
 ex morphologies of the final dried granules. Understanding the morphologic
 al transformations is important to industrial processes such as spray dryi
 ng where droplets of particulate suspensions are dried at a fast rate to p
 roduce granules of thermally sensitive materials. The transformation of an
  initial spherical shell to complex morphologies of the final dried granul
 e has been attributed to the buckling of particle-packed shells. Here\, we
  demonstrate a universal scaling law for buckling that depends on the part
 icle size\, hardness\, particle packing and size of drying drop. The criti
 cal transition for buckling is set by a dimensionless number that measures
  the competition between the compressive stress generated by capillary for
 ces and the elastic strength of the packing. The same dimensionless number
  is also responsible for cracking of drying colloidal films\, suggesting a
  universality in the mechanical behaviour of particle packings saturated w
 ith a solvent. These results should enable design of hierarchically struct
 ured\, buckle-free granules with varying porosity\, surface composition an
 d internal structure.
LOCATION:Open Plan Area\, Institute for Energy and Environmental Flows\, M
 adingley Rise CB3 0EZ
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