Surface functionalization of magnetite nanoparticle: A new approach using condensation of alkoxysilanes

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dc.contributor.authorRodriguez, A. F. R.
dc.contributor.authorCosta, T. P. [UNESP]
dc.contributor.authorBini, R. A. [UNESP]
dc.contributor.authorFaria, F. S. E. D. V.
dc.contributor.authorAzevedo, R. B.
dc.contributor.authorJafelicci, M. [UNESP]
dc.contributor.authorCoaquira, J. A. H.
dc.contributor.authorMartinez, M. A. R.
dc.contributor.authorMantilla, J. C.
dc.contributor.authorMarques, R. F. C. [UNESP]
dc.contributor.authorMorais, P. C.
dc.contributor.institutionUniv Fed Acre
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de Brasília (UnB)
dc.contributor.institutionAnhui Univ
dc.date.accessioned2018-11-26T17:40:38Z
dc.date.available2018-11-26T17:40:38Z
dc.date.issued2017-09-01
dc.description.abstractIn this study we report on successful production of two samples (BR15 and BR16) comprising magnetite (Fe3O4) nanoparticles (similar to 10 nm) surface-functionalized via hydrolysis and condensation of alkoxysilane agents, namely 3-aminopropyl-trimethoxisilane (APTS) and N-propyl-trimethoxisilane (NPTS). The as-produced samples were characterized using transmission electron microscopy (TEM), x-ray diffraction (XRD), magnetization measurements (5 K and 300 K hysteresis cycles and zero field-cooled/field-cooled measurements), and Mossbauer spectroscopy (77 and 297 K). The Mossbauer data supported the model picture of a core-shell magnetite-based system. This material system shows shell properties influenced by the surface-coating design, either APTS-coated (BR15) or APTS+NPTS-coated (sample BR16). Analyses of the Mossbauer spectra indicates that the APTS-coated sample presents Fe(III)-rich core and Fe(II)-rich shell with strong hyperfine field; whereas, the APTS+NPTS-coated sample leads to a mixture of two main nanostructures, one essentially surface-terminated with APTS whereas the other surface-terminated with NPTS, both presenting weak hyperfine fields compared with the single surface-coated sample. Magnetization measurements support the core-shell picture built from the analyses of the Mossbauer data. Our findings emphasize the capability of the Mossbauer spectroscopy in assessing subtle differences in surface-functionalized iron-based core-shell nanostructures.en
dc.description.affiliationUniv Fed Acre, Postgrad Studies Biotechnol & Biodivers, Rio Branco, Acre, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Chem, Dept Phys Chem, Sao Paulo, Brazil
dc.description.affiliationUniv Brasilia, Inst Ciencias Biol, BR-70910900 Brasilia, DF, Brazil
dc.description.affiliationUniv Brasilia, Inst Fis, BR-70910900 Brasilia, DF, Brazil
dc.description.affiliationAnhui Univ, Sch Chem & Chem Engn, Hefei 230601, Anhui, Peoples R China
dc.description.affiliationUnespUniv Estadual Paulista, Inst Chem, Dept Phys Chem, Sao Paulo, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFAP/DF
dc.description.sponsorshipINCT in Nanobiotechnology
dc.format.extent141-147
dc.identifierhttp://dx.doi.org/10.1016/j.physb.2017.06.043
dc.identifier.citationPhysica B-condensed Matter. Amsterdam: Elsevier Science Bv, v. 521, p. 141-147, 2017.
dc.identifier.doi10.1016/j.physb.2017.06.043
dc.identifier.fileWOS000410633400022.pdf
dc.identifier.issn0921-4526
dc.identifier.lattes2115942621694174
dc.identifier.orcid0000-0003-0195-3885
dc.identifier.urihttp://hdl.handle.net/11449/163240
dc.identifier.wosWOS:000410633400022
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofPhysica B-condensed Matter
dc.relation.ispartofsjr0,417
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectMagnetite nanoparticles
dc.subjectSurface-functionalization
dc.subjectHydrolysis and condensation reactions
dc.subjectX-ray diffraction
dc.subjectMossbauer spectroscopy
dc.subjectZero-field-cooled/field-cooled traces
dc.titleSurface functionalization of magnetite nanoparticle: A new approach using condensation of alkoxysilanesen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes2115942621694174[10]
unesp.author.orcid0000-0003-0195-3885[10]

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Artigos - Físico Química - IQ