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Synthesis and functionalization of magnetite nanoparticles with different amino-functional alkoxysilanes

dc.contributor.authorBini, Rafael A. [UNESP]
dc.contributor.authorMarques, Rodrigo Fernando Costa [UNESP]
dc.contributor.authorSantos, Francisco J. [UNESP]
dc.contributor.authorChaker, Juliano A.
dc.contributor.authorJafelicci, Miguel [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionAlfenas Fed Univ
dc.contributor.institutionUniversidade de Brasília (UnB)
dc.date.accessioned2014-05-20T15:32:35Z
dc.date.available2014-05-20T15:32:35Z
dc.date.issued2012-02-01
dc.description.abstractSuperparamagnetic iron oxide (SPIO) nanoparticles show great promise for many biotechnological applications. This paper addresses the synthesis and characterization of SPIO nanoparticles grafted with three different alkoxysilanes: 3-aminopropyl-triethoxysilane (APTES), 3-aminopropyl-ethyl-diethoxysilane (APDES) and 3-aminopropyl-diethy-ethoxysilane (APES). SPIO nanoparticles with an average particle diameter of 10 nm were prepared by chemical sonoprecipitation. As confirmed by Fourier transform infrared (FTIR) spectroscopy, silylation of these nanoparticles occurs through a two-step process. Decreasing the number of alkoxide groups reduced the concentration of free amino groups on the SPIO surface ([SPIO-NH(2)] APTES > APDES > APES). This phenomenon results from steric contributions and the formation of H-bonded amines provided by the ethyl groups present in the APDES and APES molecules. A simulation of SPIO nanoparticles in a saline physiologic solution shows that the ethyl groups impart larger steric stability onto the ferrofluids, which reduces aggregation. The magnetization (M) versus magnetic field (H) curves show that the synthesized iron oxide nanoparticles display superparamagnetic behavior. The zero-field cooling (ZFC) and field cooling (FC) curves show that the changes in the blocking temperature depend on the alkoxysilane-functionalized particle surface. (C) 2011 Elsevier B.V. All rights reserved.en
dc.description.affiliationSão Paulo State Univ UNESP, Lab Magnet Mat & Colloids, Inst Chem, BR-14800900 Araraquara, Brazil
dc.description.affiliationAlfenas Fed Univ, Inst Sci & Technol, BR-37701100 Pocos de Caldas, Brazil
dc.description.affiliationUniversidade de Brasilia (UnB), FCE, BR-72220140 Brasilia, DF, Brazil
dc.description.affiliationUnespSão Paulo State Univ UNESP, Lab Magnet Mat & Colloids, Inst Chem, BR-14800900 Araraquara, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent534-539
dc.identifierhttp://dx.doi.org/10.1016/j.jmmm.2011.08.035
dc.identifier.citationJournal of Magnetism and Magnetic Materials. Amsterdam: Elsevier B.V., v. 324, n. 4, p. 534-539, 2012.
dc.identifier.doi10.1016/j.jmmm.2011.08.035
dc.identifier.issn0304-8853
dc.identifier.lattes2115942621694174
dc.identifier.orcid0000-0003-0195-3885
dc.identifier.urihttp://hdl.handle.net/11449/41444
dc.identifier.wosWOS:000296536700030
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Magnetism and Magnetic Materials
dc.relation.ispartofjcr3.046
dc.relation.ispartofsjr0,786
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectMagnetiteen
dc.subjectSuperparamagnetismen
dc.subjectMagnetic measurementen
dc.subjectSurface functionalizationen
dc.subjectElectrokinetic measurementen
dc.titleSynthesis and functionalization of magnetite nanoparticles with different amino-functional alkoxysilanesen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
dspace.entity.typePublication
unesp.author.lattes2115942621694174[2]
unesp.author.orcid0000-0003-0195-3885[2]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
unesp.departmentFísico-Química - IQARpt

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