Buckling of drying droplets of colloidal suspensions

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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

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.

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