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      Evaporation of Sessile Droplets

      Author(s): 1 , 1
      Publication date Created:
      Publication date (Print):
      Journal: Annual Review of Fluid Mechanics
      Publisher: Annual Reviews

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          Abstract

          The evaporation of a sessile droplet of liquid is a complex and multifaceted fundamental topic of enduring scientific interest that is key to numerous physical and biological processes. As a result, in recent decades a considerable multidisciplinary research effort has been directed toward many different aspects of the problem. This review focuses on some of the insights that can be obtained from relatively simple mathematical models and discusses some of the directions in which the field may move in the future.

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

          Robert Deegan, Olgica Bakajin, Todd F. Dupont … (1997)
          Article 0 comments Cited 555 times – based on 0 reviews     Review now
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            Contact line deposits in an evaporating drop

            Robert Deegan, Olgica Bakajin, Todd F. Dupont … (2000)
            Article 0 comments Cited 319 times – based on 0 reviews     Review now
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              Suppression of the coffee-ring effect by shape-dependent capillary interactions.

              Peter J Yunker, Tim Still, Matthew A Lohr … (2011)
              When a drop of liquid dries on a solid surface, its suspended particulate matter is deposited in ring-like fashion. This phenomenon, known as the coffee-ring effect, is familiar to anyone who has observed a drop of coffee dry. During the drying process, drop edges become pinned to the substrate, and capillary flow outward from the centre of the drop brings suspended particles to the edge as evaporation proceeds. After evaporation, suspended particles are left highly concentrated along the original drop edge. The coffee-ring effect is manifested in systems with diverse constituents, ranging from large colloids to nanoparticles and individual molecules. In fact--despite the many practical applications for uniform coatings in printing, biology and complex assembly-the ubiquitous nature of the effect has made it difficult to avoid. Here we show experimentally that the shape of the suspended particles is important and can be used to eliminate the coffee-ring effect: ellipsoidal particles are deposited uniformly during evaporation. The anisotropic shape of the particles significantly deforms interfaces, producing strong interparticle capillary interactions. Thus, after the ellipsoids are carried to the air-water interface by the same outward flow that causes the coffee-ring effect for spheres, strong long-ranged interparticle attractions between ellipsoids lead to the formation of loosely packed or arrested structures on the air-water interface. These structures prevent the suspended particles from reaching the drop edge and ensure uniform deposition. Interestingly, under appropriate conditions, suspensions of spheres mixed with a small number of ellipsoids also produce uniform deposition. Thus, particle shape provides a convenient parameter to control the deposition of particles, without modification of particle or solvent chemistry.
              Article 0 comments Cited 297 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Title: Annual Review of Fluid Mechanics
                Abbreviated Title: Annu. Rev. Fluid Mech.
                Publisher: Annual Reviews
                ISSN (Print): 0066-4189
                ISSN (Electronic): 1545-4479
                Publication date Created: January 19 2023
                Publication date (Print): January 19 2023
                Volume: 55
                Issue: 1
                Pages: 481-509
                Affiliations
                [1 ]Department of Mathematics and Statistics, University of Strathclyde, Glasgow, United Kingdom;
                Article
                DOI: 10.1146/annurev-fluid-031822-013213
                SO-VID: 3114b2b6-3228-48ca-8a4b-8cf8fc50033e
                Copyright © © 2023
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                http://creativecommons.org/licenses/by/4.0/

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