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Suppression of the coffee-ring effect by shape-dependent capillary interactions

Author

Listed:
  • Peter J. Yunker

    (University of Pennsylvania)

  • Tim Still

    (University of Pennsylvania
    Complex Assemblies of Soft Matter, CNRS-Rhodia-University of Pennsylvania UMI 3254)

  • Matthew A. Lohr

    (University of Pennsylvania)

  • A. G. Yodh

    (University of Pennsylvania)

Abstract

Coffee rings have hidden depths When a drop of coffee dries, a halo of particles accumulates at the drop's edge. This 'coffee-ring effect', first described formally in a Nature paper in 1997, is a common occurrence when a solution of suspended colloidal particles evaporates. Far from being just a household curiosity, it has turned out to have relevance for many applications in which a uniform particle deposition is required, such as inkjet printing, assembly of photonics components and manufacture of DNA chips. In this issue, Peter Yunker and colleagues show that ellipsoidal particles suppress the coffee-ring effect. Attractive interparticle interactions between ellipsoids are sufficiently strong to counteract the forces that drive spherical particles towards the drop's edge as the drop evaporates. The coffee-ring effect can be restored for ellipsoids in solution containing surfactant, and 'designed' mixtures of spheres and ellipsoids can lead to uniform deposition.

Suggested Citation

  • Peter J. Yunker & Tim Still & Matthew A. Lohr & A. G. Yodh, 2011. "Suppression of the coffee-ring effect by shape-dependent capillary interactions," Nature, Nature, vol. 476(7360), pages 308-311, August.
    • Handle: RePEc:nat:nature:v:476:y:2011:i:7360:d:10.1038_nature10344
    DOI: 10.1038/nature10344
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    Cited by:

    1. Anik Karan & Margarita Darder & Urna Kansakar & Zach Norcross & Mark A. DeCoster, 2018. "Integration of a Copper-Containing Biohybrid (CuHARS) with Cellulose for Subsequent Degradation and Biomedical Control," IJERPH, MDPI, vol. 15(5), pages 1-12, April.
    2. Marcel Rey & Johannes Walter & Johannes Harrer & Carmen Morcillo Perez & Salvatore Chiera & Sharanya Nair & Maret Ickler & Alesa Fuchs & Mark Michaud & Maximilian J. Uttinger & Andrew B. Schofield & J, 2022. "Versatile strategy for homogeneous drying patterns of dispersed particles," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    3. Xiaodong Zhang & Yugang Zhao & Dongmin Wang, 2023. "Characterization of the Temperature Profile near Contact Lines of an Evaporating Sessile Drop," Energies, MDPI, vol. 16(6), pages 1-12, March.
    4. Jiayue Tang & Yuanyuan Zhao & Mi Wang & Dianyu Wang & Xuan Yang & Ruiran Hao & Mingzhan Wang & Yanlei Wang & Hongyan He & John H. Xin & Shuang Zheng, 2022. "Circadian humidity fluctuation induced capillary flow for sustainable mobile energy," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    5. Hossein Zargartalebi & S. Hossein Hejazi & Amir Sanati-Nezhad, 2022. "Self-assembly of highly ordered micro- and nanoparticle deposits," Nature Communications, Nature, vol. 13(1), pages 1-11, December.

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