View source for Buckling of drying droplets of colloidal suspensions

[[Onset of Buckling in Drying Droplets of Colloidal Suspension]] 

Authors: N. Tsapis, E. R. Dufresne, S. S. Sinha, C. S. Riera, J.W. Hutchinson, L. Mahadevan, and D. A. Weitz

Physical Review Letters 94, 018302 (2005)

====Soft matter keywords====
buckling, elastic shell, drying, sol-gel, Leidenfrost effect


By Tom Kodger
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===Abstract from the original paper===
Minute concentrations of suspended particles can dramatically alter the behavior of a drying droplet.
After a period of isotropic shrinkage, similar to droplets of a pure liquid, these droplets suddenly buckle
like an elastic shell. While linear elasticity is able to describe the morphology of the buckled droplets, it
fails to predict the onset of buckling. Instead, we find that buckling is coincident with a stress-induced
fluid to solid transition in a shell of particles at a droplet’s surface, occurring when attractive capillary
forces overcome stabilizing electrostatic forces between particles.

===Practical Application of Research===