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dc.contributor.authorPradilla Ragua, Diego Camilo
dc.contributor.authorSimon, Sebastien Charles
dc.contributor.authorSjøblom, Johan
dc.contributor.authorSamaniuk, Joseph
dc.contributor.authorSkrzypiec, Marta
dc.contributor.authorVermant, Jan
dc.date.accessioned2018-01-23T10:11:17Z
dc.date.available2018-01-23T10:11:17Z
dc.date.created2016-12-14T09:31:56Z
dc.date.issued2016
dc.identifier.citationLangmuir. 2016, 32 (12), 2900-2911.nb_NO
dc.identifier.issn0743-7463
dc.identifier.urihttp://hdl.handle.net/11250/2478974
dc.description.abstractThe sorption and rheological properties of an acidic polyaromatic compound (C5PeC11), which can be used to further our understanding of the behavior of asphaltenes, are determined experimentally. The results show that C5PeC11 exhibits the type of pH-dependent surface activity and interfacial shear rheology observed in C6-asphaltenes with a decrease in the interfacial tension concomitant with the elastic modulus when the pH increases. Surface pressure–area (Π–A) isotherms show evidence of aggregation behavior and π–π stacking at both the air/water and oil/water interfaces. Similarly, interactions between adsorbed C5PeC11 compounds are evidenced through desorption experiments at the oil/water interface. Contrary to indigenous asphaltenes, adsorption is reversible, but desorption is slower than for noninteracting species. The reversibility enables us to create layers reproducibly, whereas the presence of interactions between the compounds enables us to mimic the key aspects of interfacial activity in asphaltenes. Shear and dilatational rheology show that C5PeC11 forms a predominantly elastic film both at the liquid/air and the liquid/liquid interfaces. Furthermore, a soft glassy rheology model (SGR) fits the data obtained at the liquid/liquid interface. However, it is shown that the effective noise temperature determined from the SGR model for C5PeC11 is higher than for indigenous asphaltenes measured under similar conditions. Finally, from a colloidal and rheological standpoint, the results highlight the importance of adequately addressing the distinction between the material functions and true elasticity extracted from a shear measurement and the apparent elasticity measured in dilatational–pendant drop setups.nb_NO
dc.language.isoengnb_NO
dc.publisherAmerican Chemical Societynb_NO
dc.titleSorption and Interfacial Rheology Study of Model Asphaltene Compoundsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber2900-2911nb_NO
dc.source.volume32nb_NO
dc.source.journalLangmuirnb_NO
dc.source.issue12nb_NO
dc.identifier.doi10.1021/acs.langmuir.6b00195
dc.identifier.cristin1412412
dc.relation.projectNorges forskningsråd: 234112nb_NO
dc.description.localcode© American Chemical Society 2016. This is the authors accepted and refereed manuscript to the article.nb_NO
cristin.unitcode194,66,30,0
cristin.unitnameInstitutt for kjemisk prosessteknologi
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.fulltextpostprint
cristin.qualitycode2


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