Aggregation and sedimentation of magnetite nanoparticle clusters

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dc.contributor.authorVikesland, Peter J.en
dc.contributor.authorRebodos, R. L.en
dc.contributor.authorBottero, J. Y.en
dc.contributor.authorRose, J.en
dc.contributor.authorMasion, A.en
dc.contributor.departmentCivil and Environmental Engineeringen
dc.contributor.departmentInstitute for Critical Technology and Applied Science (ICTAS)en
dc.contributor.departmentDuke University. Center for the Environmental Implications of Nanotechnology (CEINT)en
dc.contributor.departmentInternational Center for the Environmental Implications of Nanotechnology (iCEINT)en
dc.date.accessioned2017-05-01T06:42:17Zen
dc.date.available2017-05-01T06:42:17Zen
dc.date.issued2016-03-24en
dc.description.abstractMagnetite nanoparticles are redox active constituents of subsurface and corrosive environments. In this study, we characterized the aggregation and sedimentation behavior of well characterized magnetite nanoparticle clusters using dynamic light scattering (DLS), UV-vis-NIR spectroscopy, and small angle X-ray scattering (SAXS). Both unfunctionalized (NaOH-magnetite) and tetramethylammonium hydroxide (TMAOH-magnetite) surface functionalized nanoparticle clusters were employed. TMAOH-magnetite has a slightly smaller primary nanoparticle radius as determined by TEM (4 ± 0.7 nm vs. 5 ± 0.8 for NaOH-magnetite) and a smaller initial DLS determined cluster radius (<30 nm vs. 100–200 nm for NaOH-magnetite). Interestingly, in spite of its smaller initial nanoparticle cluster size, TMAOH-magnetite undergoes sedimentation more rapidly than NaOH-magnetite. This behavior is consistent with the more rapid aggregation of the smaller TMAOH-magnetite clusters as well as their lower fractal dimension, as determined by SAXS. This study illustrates that both nanoparticle cluster size and fractal dimension should be carefully considered when considering the environmental transport and fate of highly aggregated nanoparticles.en
dc.format.extent567-577en
dc.format.mimetypeapplication/pdfen
dc.identifierc5en00155b.pdfen
dc.identifierc5en00155b1.pdfen
dc.identifier.doihttps://doi.org/10.1039/c5en00155ben
dc.identifier.eissn2051-8161en
dc.identifier.issn2051-8153en
dc.identifier.issue3en
dc.identifier.urihttp://hdl.handle.net/10919/77551en
dc.identifier.volume3en
dc.language.isoenen
dc.publisherRoyal Society of Chemistryen
dc.relation.ispartofRoyal Society of Chemistry Gold Open Access - 2016en
dc.rightsCreative Commons Attribution-NonCommercial 3.0 Unporteden
dc.rights.holderVikesland, Peter J.en
dc.rights.holderRebodos, R. L.en
dc.rights.holderBottero, J. Y.en
dc.rights.holderRose, J.en
dc.rights.holderMasion, A.en
dc.rights.urihttp://creativecommons.org/licenses/by-nc/3.0/en
dc.titleAggregation and sedimentation of magnetite nanoparticle clustersen
dc.title.serialEnvironmental Science: Nanoen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeDataseten

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