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Thin films and coatings

Thin films and coatings

A salty solution for the coffee-ring effect

22 Feb 2020 Isabelle Dumé
coffee ring effect
Photographs of patterns on a PET film after evaporation of drops of mixtures of acid red 1 (upper) and acid blue 25 (lower) solutions with 0 mM (left) and 16.0 mM (right) NaCl, respectively. Courtesy: Chinese Physics Letters
Trace amounts of salt can help control the “coffee-ring effect” that occurs when a solvent evapo

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Isabelle Dumé is a contributing editor to Physics World
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