Combined interfacial shear rheology and microstructure visualization of asphaltenes at air-water and oil-water interfaces

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dc.citation.issueNumber1en_US
dc.citation.journalTitleJournal of Rheologyen_US
dc.citation.volumeNumber62en_US
dc.contributor.authorLin, Yu-Jiunen_US
dc.contributor.authorBarman, Souraven_US
dc.contributor.authorHe, Pengen_US
dc.contributor.authorZhang, Zhuqingen_US
dc.contributor.authorChristopher, Gordon F.en_US
dc.contributor.authorBiswal, Sibani Lisaen_US
dc.date.accessioned2018-06-29T16:54:54Zen_US
dc.date.available2018-06-29T16:54:54Zen_US
dc.date.issued2018en_US
dc.description.abstractAsphaltenes are surface-active polyaromatic molecules in crude oil that are known to deposit in pipelines or stabilize water droplets by flocculating at interfaces resulting highly viscous emulsions, leading to significant flow assurance problems. Commercial dispersants have been developed to disturb asphaltene aggregation to mitigate deposition, but their role on the interfacial properties of asphaltene films is unclear. In this study, we elucidate asphaltene interfacial rheology at air-water and oil-water interfaces at high and low asphaltene surface coverage and in the presence of dispersants. A modified Langmuir trough with double-wall ring rheometer is used to simultaneously visualize the microstructure of asphaltene interface and measure the rheological responses. Two surface coverages, 0.5 and 4 μg cm−2, show widely different rheological responses at air-water interfaces. Strong yielding behavior was observed for higher coverage while a less yielding behavior and wider linear viscoelastic regime were observed for the lower coverage. Additionally, asphaltenes at decane-water interfaces were less shear-thinning than at air-water interfaces. Surface pressure-area compression-expansion curves show that the interface is more compressible in the presence of commercial chemical dispersants. This combined imaging and interfacial rheology platform provide an effective method to correlate asphaltene microstructure to interfacial rheological properties.en_US
dc.identifier.citationLin, Yu-Jiun, Barman, Sourav, He, Peng, et al.. "Combined interfacial shear rheology and microstructure visualization of asphaltenes at air-water and oil-water interfaces." <i>Journal of Rheology,</i> 62, no. 1 (2018) The Society of Rheology: https://doi.org/10.1122/1.5009188.en_US
dc.identifier.doihttps://doi.org/10.1122/1.5009188en_US
dc.identifier.urihttps://hdl.handle.net/1911/102320en_US
dc.language.isoengen_US
dc.publisherThe Society of Rheologyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleCombined interfacial shear rheology and microstructure visualization of asphaltenes at air-water and oil-water interfacesen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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