Onset of Buckling in Drying Droplets of Colloidal Suspensions

N. Tsapis, E. R. Dufresne, S. S. Sinha, C. S. Riera, J. W. Hutchinson, L. Mahadevan, and D. A. Weitz
Phys. Rev. Lett. 94, 018302 – Published 3 January 2005

Abstract

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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  • Received 2 August 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.018302

©2005 American Physical Society

Authors & Affiliations

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

  • DEAS and Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA

  • *Present address: UMR CNRS 8612, Centre d'Etudes Pharmaceutiques, Châtenay-Malabry, France.
  • Corresponding author. Present address: Dept. of Mechanical Engineering, Yale University, New Haven, CT. Electronic address: eric.dufresne@yale.edu

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Vol. 94, Iss. 1 — 14 January 2005

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