Estudo da rota de síntese na obtenção de Fe3O4 nanoestruturada para uso em biossensores
New biomaterials' study and development has been of great importance in the treatment or diseases detection, as an example of these new biomaterials, we have the biosensors. Biosensors are devices that, through biological reactions with a substrate, combined with a physical transducer, conve...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/40340 |
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| Resumo: | New biomaterials' study and development has been of great importance in
the treatment or diseases detection, as an example of these new biomaterials, we
have the biosensors. Biosensors are devices that, through biological reactions with a
substrate, combined with a physical transducer, convert the bio-recognition's
processes in measurable signals. The main materials used today are those based on
nanotechnology for their high specificity and sensitivity. Due to their biocompatibility
properties, injectability and the high level of accumulation in the target tissue or
organ, magnetic iron oxide nanoparticles have been extensively studied for their
technological applications, involving their main property of interest, the magnetism.
Magnetite (Fe3O4) can be obtained by combustion reaction, which is a simple, fast
and low cost method. The main objective of this final paper was to evaluate which is
the best synthesis route to obtain the magnetite, using the combustion reaction as a
synthesis method. The characterization of the obtained magnetite samples was
performed by XRD, FTIR and SEM. The XRD results showed that the iron oxide
powders obtained were a mixture of hematite and magnetite, in which the phase
generated predominantly, independent of the route used, was hematite. It was
observed that the fuel wich best favored the production of a larger fraction of the
magnetite phase was urea, at temperatures of 400°C and 800°C, however the
difference, when compared to the other fuel, was small. The SCS method promoted
the formation of larger pores in the material structure when glycine was used as fuel,
and larger grain sizes with the urea fuel. It was concluded that none of the synthesis
routes studied was efficient for the production of high purity magnetite, obtaining
hematite as the predominant phase. However, the route responsible for a result that
was closer to the ideal was that in which urea with sintering heat treatment at 400 ° C
was used. |
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