Evaporation of a Sessile Colloidal Water–Glycerol Droplet: Marangoni Ring Formation
Lijun Thayyil Raju, Christian Diddens, Yaxing Li, Alvaro Marin, Marjolein N. van der Linden, Xuehua Zhang, Detlef Lohse
Abstract
. Experiments show that the location of the Marangoni ring is strongly correlated with the Marangoni vortex. However, finite element numerical simulations fail to describe the particle distribution seen in the experiments. Interestingly, the particles not only accumulate to form the Marangoni ring but also assemble as colloidal crystals close to the liquid-air interface, yielding iridescence. The formation of the colloidal crystals in the experiments is strong evidence that non-hydrodynamic interactions, which are not represented in the simulations, also play a significant role in our system.
Topics & Concepts
Marangoni effectChemical physicsEvaporationCoffee ring effectParticle (ecology)Materials scienceSurface tensionChemistryMechanicsThermodynamicsNanotechnologyPhysicsOceanographyGeologyNanomaterials and Printing TechnologiesFluid Dynamics and Thin FilmsInnovative Microfluidic and Catalytic Techniques Innovation