1. James Franck Institute, 5640 South Ellis Avenue, Chicago, Illinois 60637, USA
2. Department of Computer Science, University of Chicago, 1100 East 58th Street, Chicago, Illinois 60637, USA

Correspondence to: Robert D. Deegan¹ Correspondence should be addressed to R.D.D. (e-mail: Email: ddeegan@cotnrol.uchicago.edu). Further information on rings tains may be found at http://MRSEC.uchicago.edu/MRSEC.

Abstract

When a spilled drop of coffee dries on a solid surface, it leaves a dense, ring-like deposit along the perimeter (Fig. 1a). The coffee—initially dispersed over the entire drop—becomes concentrated into a tiny fraction of it. Such ring deposits are common wherever drops containing dispersed solids evaporate on a surface, and they influence processes such as printing, washing and coating^{1, 2, 3, 4, 5}. Ring deposits also provide a potential means to write or deposit a fine pattern onto a surface. Here we ascribe the characteristic pattern of the deposition to a form of capillary flow in which pinning of the contact line of the drying drop ensures that liquid evaporating from the edge is replenished by liquid from the interior. The resulting outward flow can carry virtually all the dispersed material to the edge. This mechanism predicts a distinctive power-law growth of the ring mass with time—a law independent of the particular substrate, carrier fluid or deposited solids. We have verified this law by microscopic observations of colloidal fluids.

Figure 1: A ring stain and a demonstration of the physical processes involved in production of such a stain.

a, A 2-cm-diameter drop of coffee containing 1 wt% solids has dried to form a perimeter ring, accentuated in regions of high curvature. b, Spheres in water during evaporation, as described in the text. Multiple exposures are superimposed to indicate the motion of the microspheres.

High resolution image and legend (230K)