Capillary flow as the cause of ring stains from dried liquid drops View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1997-10

AUTHORS

Robert D. Deegan, Olgica Bakajin, Todd F. Dupont, Greb Huber, Sidney R. Nagel, Thomas A. Witten

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 coating1,2,3,4,5. 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. More... »

PAGES

827

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/39827

DOI

http://dx.doi.org/10.1038/39827

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037847007


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