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Issue 5, 2016
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Surfactant-driven flow transitions in evaporating droplets

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Abstract

An evaporating droplet is a dynamic system in which flow is spontaneously generated to minimize the surface energy, dragging particles to the borders and ultimately resulting in the so-called “coffee-stain effect”. The situation becomes more complex at the droplet's surface, where surface tension gradients of different natures can compete with each other yielding different scenarios. With careful experiments and with the aid of 3D particle tracking techniques, we are able to show that different types of surfactants turn the droplet's surface either rigid or elastic, which alters the evaporating fluid flow, either enhancing the classical coffee-stain effect or leading to a total flow inversion. Our measurements lead to unprecedented and detailed measurements of the surface tension difference along the evaporating droplet's surface with good temporal and spatial resolution.

Graphical abstract: Surfactant-driven flow transitions in evaporating droplets

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Article information


Submitted
18 Sep 2015
Accepted
22 Nov 2015
First published
23 Nov 2015

Soft Matter, 2016,12, 1593-1600
Article type
Paper
Author version available

Surfactant-driven flow transitions in evaporating droplets

A. Marin, R. Liepelt, M. Rossi and C. J. Kähler, Soft Matter, 2016, 12, 1593
DOI: 10.1039/C5SM02354H

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