Neutron total scattering from solid Athasbasca asphaltenes and Athabasca asphaltenes dissolved in 1-methylnaphthalene-d10 at 25wt% measured on NIMROD

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dc.contributor.authorHeaden, Thomas
dc.contributor.authorHoepfner, Michael
dc.contributor.funderEngineering and Physical Sciences Research Councilen_GB
dc.contributor.funderNational Science Foundationen_GB
dc.date.accessioned2019-01-22T10:37:05Z
dc.date.available2019-01-22T10:37:05Z
dc.date.issued2019
dc.description.abstractNeutron total scattering from solid Athasbasca asphaltenes measured on NIMROD. Asphaltenes were precipitated from Athabasca bitumen by the addition of heptane at a ratio of 40:1 by weight. The mixture was homogenized by stirring for 24 h, and the asphaltenes were separated by centrifugation at 3472g for 10 min. Solid asphaltenes were washed for 24 h in a Soxhlet extractor with pure heptane and then dried in vacuum oven at 80 °C for 4 days. Because Athabasca bitumen contains inorganic solids, an additional step was taken to isolate the asphaltenes. The solid asphaltene samples were diluted to a 4.8 wt % solution in toluene and centrifuged at 5000g for 270 min to remove the inorganic solids. The toluene was then removed by forced convection and then subsequent drying in a vacuum oven at 80 °C to obtain the solid asphaltene sample used for experimentation. Solution samples were re-dissolved in the appropriate mass of deuterated 1-methylnaphtalene at elevated temperature using a stirrer/hotplate. The sample was contained in a TiZr cell (1mm path length for solutions, 2mm path length for solids) maintained at 20C or 180C using a circulating oil bath. The measured neutron scattering was reduced to the interference differential scattering cross section, F(Q), using the GudrunN program. This program merges the time-of-flight scattering from all detectors to a single Q scale, normalizes to a 3 mm VNb plate calibration standard, subtracts scattering from the sample container and empty instrument, and applies corrections for beam attenuation, multiple scattering and inelastic scattering (by use of an iterative correction).en_GB
dc.description.sponsorshipEP/R013195/1 (EPSRC), CBET-1821762 (NSF)en_GB
dc.identifier.urihttp://purl.org/net/edata/handle/edata/748
dc.identifier.urihttp://dx.doi.org/10.5286/edata/723
dc.language.isoenen_GB
dc.relation.isreferencedbyhttp://dx.doi.org/10.1021/acs.energyfuels.8b03196en_GB
dc.rightsCreative Commons Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.otherAsphalteneen_GB
dc.titleNeutron total scattering from solid Athasbasca asphaltenes and Athabasca asphaltenes dissolved in 1-methylnaphthalene-d10 at 25wt% measured on NIMRODen_GB
dc.typeCollectionen_GB
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Merged interference neutron scattering from 25wt% Athabasca asphaltenes in 1-methylnaphthalene-d10 at 20 deg C
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