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Journal Article

Marangoni spreading and contracting three-component droplets on completely wetting surfaces

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Karpitschka,  Stefan
Group Fluidics in heterogeneous environments, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Baumgartner, D. A., Shiri, S., Sinha, S., Karpitschka, S., & Cira, N. J. (2022). Marangoni spreading and contracting three-component droplets on completely wetting surfaces. Proceedings of the National Academy of Sciences, 119: e2120432119. doi:10.1073/pnas.2120432119.


Cite as: https://hdl.handle.net/21.11116/0000-000A-F00F-7
Abstract
When a droplet comes in contact with a completely wetting surface, the liquid typically spreads until it covers the entire substrate. However, nonuniform evaporation of a multi-component droplet can generate surface tension gradients that alter this behavior. Here, we explore the rich dynamics of fully miscible, three-component droplets composed of water, ethanol, and propylene glycol on completely wetting glass substrates. These droplets initially spread rapidly but then stop and contract. We experimentally and the-oretically investigate this behavior throughout the ternary parameter space at different relative humidities. Evaporation changes the composition of the droplet over space and time, resulting in a reversal of Marangoni flows that ultimately determines the dynamic droplet shape. We illustrate the utility of such dynamics by collecting, aggregating, and removing contaminants from a 4-cm(2) area using a single mu L-scale droplet.