Síntese do Fe3O4@SiO2:phen:Eu3+: um nanocompósito magnético luminescente visando aplicações biomédicas
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Data
2017-03-03
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Universidade Federal de Goiás
Resumo
Among the various iron oxides studied, a magnetite (Fe3O4) stands out due to its
superparamagnetic behavior and its high biocompatibility. Luminescent properties
working cooperatively in magnetic nanoparticles with which the material converts certain
types of energy into emission of electromagnetic radiation at the same time, which
enables an interaction by magnetic fields. In the present work, an investigation and
structural, elemental and morphological analysis of superparamagnetic / luminescent
particles formed by coating of iron oxide by an SiO2 base network was carried out. The
Fe3O4 oxide was synthesized by the coprecipitation method, and in the Eu3+ rare earth
together with the 1,10-phenanthroline linker in the network, were responsible for energy
transfer processes in systems that checked as optical materials for materials. The
nanocomposites synthesized obeyed the formation of a core-shell system and was
verified by micrographs obtained by Electron Transmission Electron Microscopy,
evidencing a formation of nanoparticles of varied sizes. As the compositions of the
phases of the materials were characterized by X-ray Diffraction, Radiated Spark Energy
and Absorption Spectroscopy in the Infrared region, showing a crystal phase of the
magnetic oxide and a formation of nanocomposite. The properties of interest (magnetism
and photoluminescence) were evaluated and the respective results presented agreed with
each other, with characteristic emissions of Eu3+ emitting a pink coloration, and an
emission intensity for a concentration of this species in the material. The materials
presented a superparamagnetic behavior, evidencing that the oxide coating did not
change as Fe3O4 magnetic characteristics, and is in turn presented in a saturation
magnetization of 55 emu / g with a magnetic domain of 8.9 nm. As nanoparticles have
dimensions that indicate that a part has a magnetic domain.
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Palavras-chave
Magnetismo, Nanocompósito, Fotoluminescência, Core-shell, Magnetism, Nanocomposite, Photoluminescence, Core-shell
Citação
SILVA, R. L. S. Síntese do Fe3O4@SiO2:phen:Eu3+: um nanocompósito magnético luminescente visando aplicações biomédicas. 2017. 74 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2017.