Surfactant adsorption kinetics in microfluidics

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dc.contributor.author Akoury, Elias
dc.contributor.author Semin, Benoit
dc.contributor.author Maes, Florine
dc.contributor.author Riechers, Birte
dc.contributor.author Gruner, Philipp
dc.contributor.author Baret, Jean-Christophe
dc.date.accessioned 2019-03-22T08:58:42Z
dc.date.available 2019-03-22T08:58:42Z
dc.date.copyright 2016 en_US
dc.date.issued 2019-03-22
dc.identifier.issn 1091-6490 en_US
dc.identifier.uri http://hdl.handle.net/10725/10253
dc.description.abstract Emulsions are metastable dispersions. Their lifetimes are directly related to the dynamics of surfactants. We design a microfluidic method to measure the kinetics of adsorption of surfactants to the droplet interface, a key process involved in foaming, emulsification, and droplet coarsening. The method is based on the pH decay in the droplet as a direct measurement of the adsorption of a carboxylic acid surfactant to the interface. From the kinetic measurement of the bulk equilibration of the pH, we fully determine the adsorption process of the surfactant. The small droplet size and the convection during the droplet flow ensure that the transport of surfactant through the bulk is not limiting the kinetics of adsorption. To validate our measurements, we show that the adsorption process determines the timescale required to stabilize droplets against coalescence, and we show that the interface should be covered at more than 90% to prevent coalescence. We therefore quantitatively link the process of adsorption/desorption, the stabilization of emulsions, and the kinetics of solute partitioning—here through ion exchange—unraveling the timescales governing these processes. Our method can be further generalized to other surfactants, including nonionic surfactants, by making use of fluorophore–surfactant interactions. en_US
dc.language.iso en en_US
dc.title Surfactant adsorption kinetics in microfluidics en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SAS en_US
dc.author.idnumber 201900590 en_US
dc.author.department Natural Sciences en_US
dc.description.embargo N/A en_US
dc.relation.journal Proceedings of the National Academy of Sciences of the United States of America en_US
dc.journal.volume 113 en_US
dc.journal.issue 41 en_US
dc.article.pages 11465-11470 en_US
dc.keywords Droplet en_US
dc.keywords Interfaces en_US
dc.keywords Surfactant en_US
dc.keywords Emulsion en_US
dc.keywords Microfluidics en_US
dc.identifier.doi https://doi.org/10.1073/pnas.1604307113 en_US
dc.identifier.ctation Riechers, B., Maes, F., Akoury, E., Semin, B., Gruner, P., & Baret, J. C. (2016). Surfactant adsorption kinetics in microfluidics. Proceedings of the National Academy of Sciences, 113(41), 11465-11470. en_US
dc.author.email elias.akoury@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url https://www.pnas.org/content/113/41/11465.short en_US
dc.orcid.id https://orcid.org/0000-0001-5202-8935 en_US
dc.author.affiliation Lebanese American University en_US

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