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Asphaltene-induced spontaneous emulsification: Effects of interfacial co-adsorption and viscoelasticity

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dc.contributor.authorAnand, Satyam
dc.contributor.authorYao, Zhen
dc.contributor.authorKannan, Aadithya
dc.contributor.authorFuller, Gerald G.
dc.contributor.authorRodríguez Hakim, Mariana
dc.contributor.authorTajuelo Rodríguez, Javier
dc.date.accessioned2024-05-20T11:27:59Z
dc.date.available2024-05-20T11:27:59Z
dc.date.issued2020-07-01
dc.description.abstractAsphaltenes are a class of high molecular weight aromatic compounds found in crude oil. They adsorb onto toluene-water interfaces and induce a spontaneous emulsification phenomenon, whereby stable water-in-oil emulsions form without the need of an external energy input. This work aims to control and understand the factors affecting spontaneous droplet formation in the presence of asphaltene adsorption. This is particularly useful for crude oil refining, where the presence of a stable emulsion hampers the efficiency of downstream processing operations. We explore the effect of the addition of copolymers designed as crude oil flow improvers as a means to control the extent of emulsion formation. We find that the polymers competitively adsorb onto the toluene-water interface and diminish spontaneous emulsification. We also conduct fluorescence microscopy experiments and measurements of the interfacial energy to determine the mechanism of spontaneous emulsification in asphaltene systems. We conclude that an emulsion forms via the diffusion of molecular water into the oil phase and subsequent binding with asphaltene aggregates, leading to the nucleation of micrometer-sized water droplets. We find that the polymer forms complexes with the dissolved asphaltenes, possibly hampering the ability of diffused water to bind to the asphaltenes and reducing the extent of spontaneous emulsification. Finally, we investigate the role of interfacial shear and dilatational viscoelasticity to better understand which fundamental interfacial properties are important in the emulsification of asphaltene-laden systems. We find that the rate of formation of an interfacial microstructural network is inversely correlated with the extent and rate of spontaneous emulsification.en
dc.description.versionversión publicada
dc.identifier.doihttps://doi.org/10.1122/1.5145307
dc.identifier.issn0148-6055; eISSN: 1520-8516
dc.identifier.urihttps://hdl.handle.net/20.500.14468/12047
dc.journal.issue4
dc.journal.volume64
dc.language.isoen
dc.publisherAmerican Institute of Physics
dc.relation.centerFacultad de Ciencias
dc.relation.departmentFísica Fundamental
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.titleAsphaltene-induced spontaneous emulsification: Effects of interfacial co-adsorption and viscoelasticityes
dc.typejournal articleen
dc.typeartículoes
dspace.entity.typePublication
relation.isAuthorOfPublication0d3ca748-728d-48f4-b71c-55f101dfb9d8
relation.isAuthorOfPublicationf6b576e9-92f7-414e-bc62-6ef2e5eddedd
relation.isAuthorOfPublication.latestForDiscovery0d3ca748-728d-48f4-b71c-55f101dfb9d8
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