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Liquid-liquid coffee-ring effect

Abstract : The so-called coffee-ring effect (CRE) is extraordinarily common, problematic in industry and attractively puzzling for researchers, with the accepted rule that it requires two key-ingredients: solvent evaporation and contact line pinning. Here, we demonstrate that the CRE also occurs when the solvent of a pinned sessile drop transfers into another liquid, without involving any evaporation. We show that it shares all characteristic features of the evaporative CRE: solvent transfer-driven transport of solutes to the contact line, ring-shaped deposit, closely-packed particle organization at the contact line, and sizedependent particle sorting. We thus suggest expanding the definition of the coffee-ring effect to any pinned drop having its solvent transferring to an outer medium where the drop compounds cannot be dissolved.
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https://hal.archives-ouvertes.fr/hal-03020973
Contributor : Sergii Rudiuk <>
Submitted on : Tuesday, November 24, 2020 - 11:04:58 AM
Last modification on : Tuesday, December 8, 2020 - 3:35:06 AM

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Vincent Poulichet, Mathieu Morel, Sergii Rudiuk, Damien Baigl. Liquid-liquid coffee-ring effect. Journal of Colloid and Interface Science, Elsevier, 2020, 573, pp.370-375. ⟨10.1016/j.jcis.2020.03.094⟩. ⟨hal-03020973⟩

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