Dynamics of bacterial deposition in evaporating drops

Evaporation of drops almost always deposits their suspended particles at the drop edge. The dynamics of this process and the resulting patterns depend upon various parameters related to the liquid, substrate, and particles. An interesting scenario is interactions among the particles leading to inhom...

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Bibliographic Details
Published in:Physics of fluids (1994) 2020-09, Vol.32 (9)
Main Authors: Agrawal, Akanksha, Sinha, Shubham, Mukherjee, Raju, Mampallil, Dileep
Format: Article
Language:English
Subjects:
Bacteria
Complex systems
Dynamics
Evaporation
Fluid dynamics
Physics
Substrates
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Summary:Evaporation of drops almost always deposits their suspended particles at the drop edge. The dynamics of this process and the resulting patterns depend upon various parameters related to the liquid, substrate, and particles. An interesting scenario is interactions among the particles leading to inhomogeneous depositions characterized by distinct edge-growth dynamics. Here, we study a more complex system with bacteria inside the evaporating drop. Bacteria interact like sticky particles forming inhomogeneous clusters, however, with edge-growth dynamics as that of non-interacting particles. We hypothesis that this contradicting behavior is due to the increased randomness introduced by bacteria–substrate interactions. Our findings have importance in understanding the patterns and their formation in growth systems of soft matter.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0024078