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dc.contributor.author Coelho, Jakelyne Viana
dc.contributor.author Guedes, Marina Silva
dc.contributor.author Barrera Diaz, Deicy Amparo
dc.contributor.author Sapag, Manuel Karim
dc.contributor.author Pereira, Márcio César
dc.contributor.author de Oliveira, Luiz Carlos Alves
dc.date.available 2016-05-16T20:42:23Z
dc.date.issued 2013-08
dc.identifier.citation Coelho, Jakelyne Viana; Guedes, Marina Silva; Barrera Diaz, Deicy Amparo; Sapag, Manuel Karim; Pereira, Márcio César; et al.; Controlling the morphology and pore size of mesostructured silica nanoparticles: the role of iron oxidation state; Royal Society of Chemistry; Dalton Transactions; 42; 31; 8-2013; 11271-11280
dc.identifier.issn 1477-9226
dc.identifier.uri http://hdl.handle.net/11336/5703
dc.description.abstract We demonstrate morphology and pore size dependence of silica nanoparticles (SNPs) synthesized via control of the iron oxidation state. In the absence of any Fe species, only spherical SNPs are produced, whereas in the presence of Fe3+ and Fe2+ ions, SNPs with rod-like and nanosheet morphologies, 10 respectively, are formed. The average pore size increase from 1.7 nm in the absence of iron to 3.2 and 5.9 nm as Fe3+ and Fe2+, respectively, were used during the synthesis. Both samples of SNPs synthesized in the presence of Fe2+ and Fe3+ have 0.2 wt.% of tetrahedral iron in the silica framework, whereas most of the iron is in the silica extraframework, as verified by Mössbauer spectroscopy, UV-vis diffuse reflectance, FTIR, XRD data and TPR analysis. These Fe2+ and Fe3+ cations play a fundamental role to 15 control these properties because they change the curvature and the surface charge density of CTAB micelles, thus favoring the spherical to rod-like transition. The rod-like shape was retained in Fe3+- containing sample, whereas a nanosheet-like morphology was produced in Fe2+-containing sample due to the breakage of silica walls during the thermal treatment to remove the template. The control of the textural properties is interesting to allow the fabrication of selective photocatalysts for oxidation of 20 different organic substrates.
dc.format application/pdf
dc.language.iso eng
dc.publisher Royal Society of Chemistry
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject MCM 41
dc.subject Mossbauer
dc.subject Iron oxide
dc.subject RTP
dc.subject.classification Ingeniería de los Materiales
dc.subject.classification Ingeniería de los Materiales
dc.subject.classification INGENIERÍAS Y TECNOLOGÍAS
dc.title Controlling the morphology and pore size of mesostructured silica nanoparticles: the role of iron oxidation state
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2016-05-13T13:43:14Z
dc.journal.volume 42
dc.journal.number 31
dc.journal.pagination 11271-11280
dc.journal.pais Reino Unido
dc.journal.ciudad Cambridge
dc.description.fil Fil: Coelho, Jakelyne Viana. Universidade Federal Do Minas Gerais; Brasil
dc.description.fil Fil: Guedes, Marina Silva. Universidade Federal Do Minas Gerais; Brasil
dc.description.fil Fil: Barrera Diaz, Deicy Amparo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; Argentina
dc.description.fil Fil: Sapag, Manuel Karim. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; Argentina
dc.description.fil Fil: Pereira, Márcio César. Universidade Federal dos Vales do Jequitinhonha e Mucuri. Instituto de Ciência, Engenharia e Tecnologia ; Brasil
dc.description.fil Fil: de Oliveira, Luiz Carlos Alves. Universidade Federal Do Minas Gerais; Brasil
dc.journal.title Dalton Transactions
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://pubs.rsc.org/en/Content/ArticleLanding/2013/DT/C3DT50794G
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1039/C3DT50794G
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/10.1039/C3DT50794G


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    Articulos de INST. DE FISICA APLICADA "DR. JORGE ANDRES ZGRABLICH"

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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)