Patterns in Drying Drops Dictated by Curvature-Driven Particle Transport

Langmuir : the ACS Journal of Surfaces and Colloids
Ranajit MondalMadivala G Basavaraj

Abstract

Patterns generated by controlled evaporation of droplets containing colloids are dictated by internally generated flows. This advective particle transport is crucial to the efficacy of printing and coating processes and is also an elegant route to the self-assembly of particles. We propose a novel particle transport route, which involves adsorption of particles to the interface and subsequent curvature-driven migration of the particles along the interface. This interface-mediated transport can be exploited to control the distribution of particles in the dried patterns, which we experimentally elucidate by achieving gravity-induced drop shape changes. Our experiments demonstrate that the interplay between the bulk and the interfacial transport leads to strikingly different patterns: while dried aqueous sessile drops of colloidal dispersions produce well known "coffee-rings", dried pendant drops lead to "coffee-eyes". We support our experimental findings using scaling arguments. In previous studies, the effect of gravity-induced change in drop shape on the patterns formed in drying drops has been neglected. However, we show that the structure of the patterns formed by the colloidal particles after solvent evaporation is markedly ...Continue Reading

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Citations

Apr 3, 2020·Soft Matter·Ranajit Mondal, Madivala G Basavaraj
Sep 4, 2019·Physical Chemistry Chemical Physics : PCCP·Ranajit Mondal, Madivala G Basavaraj
Apr 3, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Dinesh ParthasarathyMadivala G Basavaraj
Jul 29, 2021·Soft Matter·P Logesh KumarMadivala G Basavaraj
Jul 11, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·P Logesh KumarMadivala G Basavaraj
Jul 20, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Chris S Hodges, S Mick Tangparitkul
Apr 8, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Hisay LamaMadivala G Basavaraj
Jun 2, 2020·ACS Omega·Sumesh P Thampi, Madivala G Basavaraj

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