Evaporation of a Sessile Colloidal Water-Glycerol Droplet: Marangoni Ring Formation.

ABSTRACT: The transport and aggregation of particles in suspensions is an important process in many physicochemical and industrial processes. In this work, we study the transport of particles in an evaporating binary droplet. Surprisingly, the accumulation of particles occurs not only at the contact line (due to the coffee-stain effect) or at the solid substrate (due to sedimentation) but also at a particular radial position near the liquid-air interface, forming a "ring", which we term as the Marangoni ring. The formation of this ring is primarily attributed to the solutal Marangoni flow triggered by the evaporation dynamics of the water-glycerol droplet. Experiments and simulations show fair agreement in the volume evolution and the general structure of the solutal Marangoni flow, that is,

SUBMITTER: Thayyil Raju L 

PROVIDER: S-EPMC9536018 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature