Size-Strain Analysis of Iron-Excess Mn-Zn Ferrite Nanoparticles Using Synchrotron Diffraction and Its Correlation with Magnetic Saturation and Isoelectric pH

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dc.contributor.authorIchikawa, Rodrigo U.
dc.contributor.authorParra, Joao P. R. L. L. [UNESP]
dc.contributor.authorMartins, Murillo L.
dc.contributor.authorYoshito, Walter K.
dc.contributor.authorSaeki, Margarida J. [UNESP]
dc.contributor.authorTurrillas, Xavier
dc.contributor.authorMartinez, Luis G.
dc.contributor.institutionInst Pesquisas Energet & Nucl
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Copenhagen
dc.contributor.institutionInst Ciencia Mat Barcelona
dc.contributor.institutionALBA Synchrotron
dc.date.accessioned2018-11-26T15:47:34Z
dc.date.available2018-11-26T15:47:34Z
dc.date.issued2018-08-01
dc.description.abstractIron-excess Mn-Zn ferrite nanoparticles were prepared by coprecipitation with sodium hydroxide (NaOH) at different concentrations (0.1, 0.2, 0.5 and 1.0 mol/L). The results of X-ray diffraction (XRD) analysis using Whole Powder Pattern Modeling (WPPM) showed that higher concentrations of NaOH promote crystallite growth and broader dispersion in crystallite sizes. Energy dispersive X-ray spectroscopy indicates that zinc loss is noticeable when [NaOH] = 0.2 mol/L. XRD revealed also a significant less-crystalline phase contribution alongside the main peaks of the nanocrystalline cubic spinel ferrite phase. The less-crystalline fraction is lower for the ferrite obtained with 0.2 mol/L of NaOH, being about 50% and more than 70% for the other samples. Despite of the less-crystalline fraction and the excess of iron, no secondary phases were detected. The Warren curves showed that the concentration of NaOH significantly influences the microstrain in the crystallites, being smaller for the sample obtained with NaOH at 0.2 mol/L. The sample prepared with this condition presented the better properties to be used as magnetic tracer in clinical diagnoses combining small mean crystallite size, low microstrain, which resulted in materials with higher magnetic saturation and high surface charge under blood pH.en
dc.description.affiliationInst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, UNESP, BR-18618970 Botucatu, SP, Brazil
dc.description.affiliationUniv Copenhagen, Niels Bohr Inst, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
dc.description.affiliationInst Ciencia Mat Barcelona, Campus UAB, Bellaterra 08193, Spain
dc.description.affiliationALBA Synchrotron, Carrer Llum 2-26, E-08290 Barcelona, Spain
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, BR-18618970 Botucatu, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCNPq: 206983-/2014-0
dc.description.sponsorshipIdFAPESP: 2010/07639-9
dc.format.extent5697-5703
dc.identifierhttp://dx.doi.org/10.1166/jnn.2018.15446
dc.identifier.citationJournal Of Nanoscience And Nanotechnology. Valencia: Amer Scientific Publishers, v. 18, n. 8, p. 5697-5703, 2018.
dc.identifier.doi10.1166/jnn.2018.15446
dc.identifier.issn1533-4880
dc.identifier.urihttp://hdl.handle.net/11449/160122
dc.identifier.wosWOS:000426059800062
dc.language.isoeng
dc.publisherAmer Scientific Publishers
dc.relation.ispartofJournal Of Nanoscience And Nanotechnology
dc.relation.ispartofsjr0,326
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectMn-Zn Ferrites
dc.subjectNanoparticles
dc.subjectSize-Strain Analysis
dc.subjectX-ray Synchrotron Diffraction
dc.titleSize-Strain Analysis of Iron-Excess Mn-Zn Ferrite Nanoparticles Using Synchrotron Diffraction and Its Correlation with Magnetic Saturation and Isoelectric pHen
dc.typeArtigo
dcterms.rightsHolderAmer Scientific Publishers

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