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Active matter alters the growth dynamics of coffee rings

Journal article
Authors T. Andac
P. Weigmann
S. K. P. Velu
E. Pince
G. Volpe
Giovanni Volpe
A. Callegari
Published in Soft Matter
Volume 15
Issue 7
Pages 1488-1496
ISSN 1744-683X
Publication year 2019
Published at Department of Physics (GU)
Pages 1488-1496
Language en
Links dx.doi.org/10.1039/c8sm01350k
Keywords pattern-formation, escherichia-coli, droplets, evaporation, surfactant, stains, flow, deposition, motility, Chemistry, Materials Science, Physics, Polymer Science
Subject categories Physical Chemistry

Abstract

How particles are deposited at the edge of evaporating droplets, i.e. the coffee ring effect, plays a crucial role in phenomena as diverse as thin-film deposition, self-assembly, and biofilm formation. Recently, microorganisms have been shown to passively exploit and alter these deposition dynamics to increase their survival chances under harshening conditions. Here, we show that, as the droplet evaporation rate slows down, bacterial mobility starts playing a major role in determining the growth dynamics of the edge of drying droplets. Such motility-induced dynamics can influence several biophysical phenomena, from the formation of biofilms to the spreading of pathogens in humid environments and on surfaces subject to periodic drying. Analogous dynamics in other active matter systems can be exploited for technological applications in printing, coating, and self-assembly, where the standard coffee-ring effect is often a nuisance.

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