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  Solutal Marangoni flow as the cause of ring stains from drying salty colloidal drops

Marin, A., Karpitschka, S., Noguera-Marin, D., Cabrerizo-Vilchez, M. A., Rossi, M., Kahler, C. J., et al. (2019). Solutal Marangoni flow as the cause of ring stains from drying salty colloidal drops. Physical Review Fluids, 4(4): 041601. doi:10.1103/PhysRevFluids.4.041601.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-9975-D Version Permalink: http://hdl.handle.net/21.11116/0000-0003-E83B-6
Genre: Journal Article

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Marin, A., Author
Karpitschka, Stefan1, Author              
Noguera-Marin, D., Author
Cabrerizo-Vilchez, M. A., Author
Rossi, M., Author
Kahler, C. J., Author
Valverde, M. A. R., Author
Affiliations:
1Group Fluidics in heterogeneous environments, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2466703              

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 Abstract: Evaporating salty droplets are ubiquitous in nature, in our home and in the laboratory. Interestingly, the transport processes in such apparently simple systems differ strongly from evaporating "freshwater" droplets since convection is partly inverted due to Marangoni stresses. Such an effect has crucial consequences to the salt crystallization process and to the deposits left behind. In this work we show unprecedented measurements that, not only confirm clearly the flow inversion, but also elucidate their impact on the distribution of nonvolatile solutes. Contrary to what has been often reported in the literature, such a flow reversal does not prevent the formation of ring-shaped stains: particles accumulate at the contact line driven solely by the interfacial flow. We can therefore conclude that the classical "coffee-stain effect" is not the only mechanism that can generate ring-shaped stains in evaporating droplets.

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Language(s): eng - English
 Dates: 2019-04-292019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevFluids.4.041601
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Title: Physical Review Fluids
Source Genre: Journal
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Pages: 7 Volume / Issue: 4 (4) Sequence Number: 041601 Start / End Page: - Identifier: -