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      Gravitational Effect in Evaporating Binary Microdroplets

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

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            PIVlab – Towards User-friendly, Affordable and Accurate Digital Particle Image Velocimetry in MATLAB

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              Marangoni effect reverses coffee-ring depositions.

              We show here both experimentally and theoretically that the formation of "coffee-ring" deposits observed at the edge of drying water droplets requires not only a pinned contact line but also suppression of Marangoni flow. For simple organic fluids, deposition actually occurs preferentially at the center of the droplet, due to a recirculatory flow driven by surface-tension gradients produced by the latent heat of evaporation. The manipulation of this Marangoni flow in a drying droplet should allow one in principle to control and redirect evaporation-driven deposition and assembly of colloids and other materials.
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                Author and article information

                Journal
                PRLTAO
                Physical Review Letters
                Phys. Rev. Lett.
                American Physical Society (APS)
                0031-9007
                1079-7114
                March 2019
                March 18 2019
                : 122
                : 11
                Article
                10.1103/PhysRevLett.122.114501
                © 2019

                https://link.aps.org/licenses/aps-default-license

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