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  Delayed coalescence of surfactant containing sessile droplets

Bruning, M. A., Costalonga, M., Karpitschka, S., & Snoeijer, J. H. (2018). Delayed coalescence of surfactant containing sessile droplets. Physical Review Fluids, 3(7): 073605. doi:10.1103/PhysRevFluids.3.073605.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-EA28-B Version Permalink: http://hdl.handle.net/21.11116/0000-0001-EA29-A
Genre: Journal Article

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Bruning, M. A., Author
Costalonga, M., Author
Karpitschka, Stefan1, Author              
Snoeijer, J. H., 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: When two sessile drops of the same liquid touch, they merge into one drop, driven by capillarity. However, the coalescence can be delayed, or even completely stalled for a substantial period of time, when the two drops have different surface tensions, despite being perfectly miscible. A temporary state of noncoalescence arises, during which the drops move on their substrate, only connected by a thin neck between them. Existing literature covers pure liquids and mixtures with low surface activities. In this paper, we focus on the case of large surface activities, using aqueous surfactant solutions with varying concentrations. It is shown that the coalescence behavior can be classified into three regimes that occur for different surface tensions and contact angles of the droplets at initial contact. However, not all phenomenology can be predicted from surface tension contrast or contact angles alone, but strongly depends on the surfactant concentrations as well. This reveals that the merging process is not solely governed by hydrodynamics and geometry, but also depends on the molecular physics of surface adsorption.

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Language(s): eng - English
 Dates: 2018-07-302018-07
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevFluids.3.073605
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Title: Physical Review Fluids
Source Genre: Journal
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Pages: 12 Volume / Issue: 3 (7) Sequence Number: 073605 Start / End Page: - Identifier: -