Flexible magnetic membranes based on bacterial cellulose and its evaluation as electromagnetic interference shielding material

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dc.contributor.authorMarins, Jéssica A.
dc.contributor.authorSoares, Bluma G.
dc.contributor.authorBarud, Hernane S. [UNESP]
dc.contributor.authorRibeiro, Sidney J.L. [UNESP]
dc.contributor.institutionUniversidade Federal do Rio de Janeiro (UFRJ)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:30:47Z
dc.date.available2014-05-27T11:30:47Z
dc.date.issued2013-10-01
dc.description.abstractFlexible magnetic membranes with high proportion of magnetite were successfully prepared by previous impregnation of the never dried bacterial cellulose pellicles with ferric chloride followed by reduction with sodium bisulfite and alkaline treatment for magnetite precipitation. Membranes were characterized by Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), vibrating magnetometer, field emission scanning electron microscopy (FEG-SEM) and impedance spectroscopy. Microwave properties of these membranes were investigated in the X-band (8.2 to 12.4 GHz). FEG-SEM micrographs show an effective coverage of the BC nanofibers by Fe 3O4 nanoparticles. Membranes with up to 75% in weight of particles have been prepared after 60 min of reaction. Magnetite nanoparticles in the form of aggregates well adhered to the BC fibers were observed by SEM. The average crystal sizes of the magnetic particles were in the range of 10 ± 1 to 13 ± 1 nm (estimated by XRD). The magnetic particles in the BC pellicles presented superparamagnetic behavior with a saturation magnetization in the range of 60 emu g- 1 and coercive force around 15 Oe. These magnetic pellicles also displayed high electrical permittivity and a potential application as microwave absorber materials. © 2013 Elsevier B.V.en
dc.description.affiliationUniversidade Federal Do Rio de Janeiro Instituto de Macromoléculas Centro de Tecnologia, Rio de Janeiro, RJ
dc.description.affiliationUniversidade Estadual Paulista Instituto de Química UNESP, Araraquara, SP
dc.description.affiliationUnespUniversidade Estadual Paulista Instituto de Química UNESP, Araraquara, SP
dc.format.extent3994-4001
dc.identifierhttp://dx.doi.org/10.1016/j.msec.2013.05.035
dc.identifier.citationMaterials Science and Engineering C, v. 33, n. 7, p. 3994-4001, 2013.
dc.identifier.doi10.1016/j.msec.2013.05.035
dc.identifier.issn0928-4931
dc.identifier.scopus2-s2.0-84881122296
dc.identifier.urihttp://hdl.handle.net/11449/76725
dc.identifier.wosWOS:000325445700056
dc.language.isoeng
dc.relation.ispartofMaterials Science and Engineering C
dc.relation.ispartofjcr5.080
dc.relation.ispartofsjr1,110
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectBacterial cellulose
dc.subjectMagnetite and electromagnetic wave absorbers
dc.subjectElectrical permittivity
dc.subjectElectromagnetic interference shielding materials
dc.subjectElectromagnetic wave absorber
dc.subjectField emission scanning electron microscopy
dc.subjectImpedance spectroscopy
dc.subjectSuperparamagnetic behavior
dc.subjectVibrating magnetometers
dc.subjectCellulose
dc.subjectChlorination
dc.subjectChlorine compounds
dc.subjectElectromagnetic pulse
dc.subjectField emission microscopes
dc.subjectFourier transform infrared spectroscopy
dc.subjectMagnetism
dc.subjectMagnetite
dc.subjectOre reduction
dc.subjectSaturation magnetization
dc.subjectSuperparamagnetism
dc.subjectX ray diffraction
dc.subjectMembranes
dc.titleFlexible magnetic membranes based on bacterial cellulose and its evaluation as electromagnetic interference shielding materialen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
unesp.author.orcid0000-0003-3286-9440[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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