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dc.contributor.authorMarins, Jéssica A.-
dc.contributor.authorSoares, Bluma G.-
dc.contributor.authorBarud, Hernane S.-
dc.contributor.authorRibeiro, Sidney J.L.-
dc.identifier.citationMaterials Science and Engineering C, v. 33, n. 7, p. 3994-4001, 2013.-
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.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.subjectChlorine compounds-
dc.subjectElectromagnetic pulse-
dc.subjectField emission microscopes-
dc.subjectFourier transform infrared spectroscopy-
dc.subjectOre reduction-
dc.subjectSaturation magnetization-
dc.subjectX ray diffraction-
dc.titleFlexible magnetic membranes based on bacterial cellulose and its evaluation as electromagnetic interference shielding materialen
dc.contributor.institutionUniversidade Federal do Rio de Janeiro (UFRJ)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
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.rights.accessRightsAcesso restrito-
dc.relation.ispartofMaterials Science and Engineering C-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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