Pattern formation in drying drops

Robert D. Deegan
Phys. Rev. E 61, 475 – Published 1 January 2000
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Abstract

Ring formation in an evaporating sessile drop is a hydrodynamic process in which solids dispersed in the drop are advected to the contact line. After all the liquid evaporates, a ring-shaped deposit is left on the substrate that contains almost all the solute. Here I show that the drop itself can generate one of the essential conditions for ring formation to occur: contact line pinning. Furthermore, I show that when self-induced pinning is the only source of pinning an array of patterns—that include cellular and lamellar structures, sawtooth patterns, and Sierpinski gaskets—arises from the competition between dewetting and contact line pinning.

  • Received 24 November 1998

DOI:https://doi.org/10.1103/PhysRevE.61.475

©2000 American Physical Society

Authors & Affiliations

Robert D. Deegan*

  • James Franck Institute, 5640 South Ellis Avenue, Chicago, Illinois 60637

  • *Electronic address: rddeegan@chaos.ph.utexas.edu

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Vol. 61, Iss. 1 — January 2000

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