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dc.contributor.authorB. Melnichenko, Yuri
dc.contributor.authorMayama, H.
dc.contributor.authorCheng, G.
dc.contributor.authorBlach, Tomasz
dc.date.accessioned2017-05-03T14:52:31Z
dc.date.available2017-05-03T14:52:31Z
dc.date.issued2010
dc.date.modified2011-04-11T06:48:43Z
dc.identifier.issn0743-7463
dc.identifier.doi10.1021/la904032p
dc.identifier.urihttp://hdl.handle.net/10072/37826
dc.description.abstractPhase behavior of CO2 confined in porous fractal silica with volume fraction of SiO2 fs = 0.15 was investigated using small-angle neutron scattering (SANS) and ultrasmall-angle neutron scattering (USANS) techniques. The range of fluid densities (0<(FCO2 )bulk<0.977 g/cm3) and temperatures (T=22 C, 35 and 60 C) corresponded to gaseous, liquid, near critical and supercritical conditions of the bulk fluid. The results revealed formation of a dense adsorbed phase in small pores with sizes D<40 Aࠡt all temperatures. At low pressure (P <55 bar, (FCO2)bulk <0.2 g/cm3) the average fluid density in pores may exceed the density of bulk fluid by a factor up to 6.5 at T=22 C. This "enrichment factor" gradually decreases with temperature, however significant fluid densification in small pores still exists at temperatureT=60 C, i.e., far above the liquid-gas critical temperature of bulk CO2 (TC=31.1 C). Larger pores are only partially filled with liquid-like adsorbed layer which coexists with unadsorbed fluid in the pore core. With increasing pressure, all pores become uniformly filled with the fluid, showing no measurable enrichment or depletion of the porous matrix with CO2.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Chemical Society
dc.publisher.placeUnited States
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom6374
dc.relation.ispartofpageto6379
dc.relation.ispartofissue9
dc.relation.ispartofjournalLangmuir
dc.relation.ispartofvolume26
dc.rights.retentionY
dc.subject.fieldofresearchChemical Engineering not elsewhere classified
dc.subject.fieldofresearchcode090499
dc.titleMonitoring Phase Behavior of Sub- and Supercritical CO2 Confined in Porous Fractal Silica with 85% Porosity
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyrightSelf-archiving of the author-manuscript version is not yet supported by this journal. Please refer to the journal link for access to the definitive, published version or contact the authors for more information.
gro.date.issued2010
gro.hasfulltextNo Full Text
gro.griffith.authorBlach, Tomasz P.


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