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dc.contributor.author
Alicke, Alexandra
dc.contributor.author
Simon, Sébastien
dc.contributor.author
Sjöblom, Johan
dc.contributor.author
Vermant, Jan
dc.date.accessioned
2021-01-08T10:26:03Z
dc.date.available
2021-01-07T20:04:18Z
dc.date.available
2021-01-08T10:26:03Z
dc.date.issued
2020-12-15
dc.identifier.issn
0743-7463
dc.identifier.issn
1520-5827
dc.identifier.other
10.1021/acs.langmuir.0c02234
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/460364
dc.description.abstract
Asphaltenes have been suggested to play an important role in the remarkable stability of some water-in-crude oil emulsions, although the precise mechanisms by which they act are not yet fully understood. Being one of the more polar fractions in crude oils, asphaltenes are surface active and strongly adsorb at the oil/water interface, and as the interface becomes densely packed, solid-like mechanical properties emerge, which influence many typical interfacial experiments. The present work focuses on purposefully measuring the rheology in the limit of an insoluble, spread Langmuir monolayer in the absence of adsorption/desorption phenomena. Moreover, the changes in surface tension are deconvoluted from the purely mechanical contribution to the surface stress by experiments with precise interfacial kinematics. Compression "isotherms" are combined with the measurement of both shear and dilatational rheological properties to evaluate the relative contributions of mechanical versus thermodynamic aspects, i.e., to evaluate the "interfacial theological" versus the standard interfacial activity. The experimental results suggest that asphaltene nanoaggregates are not very efficient in lowering interfacial tension but rather impart significant mechanical stresses. Interestingly, physical aging effects are not observed in the spread layers, contrary to results for adsorbed layers. By further studying asphaltene fractions of different polarity, we investigate whether mere packing effects or strong interactions determine the mechanical response of the dense asphaltene systems as either soft glassy or gel-like responses have been reported. The compressional and rheological data reflect the dense packing, and the behavior is captured well by the soft glassy rheology model, but a more complicated multilayer structure may develop as coverage is increased. Potential implications of the experimental observations on these model and insoluble interfaces for water-in-crude oil emulsion stability are briefly discussed.
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society
en_US
dc.title
Assessing the Interfacial Activity of Insoluble Asphaltene Layers: Interfacial Rheology versus Interfacial Tension
en_US
dc.type
Journal Article
dc.date.published
2020-12-02
ethz.journal.title
Langmuir
ethz.journal.volume
36
en_US
ethz.journal.issue
49
en_US
ethz.journal.abbreviated
Langmuir
ethz.pages.start
14942
en_US
ethz.pages.end
14959
en_US
ethz.size
18 p.
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02160 - Dep. Materialwissenschaft / Dep. of Materials::02646 - Institut für Polymere / Institute of Polymers::09482 - Vermant, Jan / Vermant, Jan
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02160 - Dep. Materialwissenschaft / Dep. of Materials::02646 - Institut für Polymere / Institute of Polymers::09482 - Vermant, Jan / Vermant, Jan
ethz.date.deposited
2021-01-07T20:04:21Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-01-08T10:26:12Z
ethz.rosetta.lastUpdated
2021-02-15T23:00:33Z
ethz.rosetta.versionExported
true
ethz.COinS
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