Síntese, caracterização e aplicação de nanopartículas de NiFe2O4 produzidas via método sol-gel protéico

Detalhes bibliográficos
Ano de defesa: 2013
Autor(a) principal: Nogueira, Núbia Alves de Souza
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://www.repositorio.ufc.br/handle/riufc/7869
Resumo: Magnetic nanoparticles of NiFe2O4 were synthesized by the proteic sol-gel method,using nickel (II) and iron (III) nitrates and aqueous solution of gelatin (GelitaTM). The dried solution in the form of resin, were characterized by thermogravimetric analysis(TGA), combined with the temperature-programmed oxidation (TPO). The sampleso o o oof NiFe2O4 were synthesized at different temperatures (250 C, 300 C, 400 C, 600 C,800o C e 1000oC), the annealing time interval was of 4 h; and 400oC for differentsintering times (2h, 3h e 4h). The obtained nanoparticles werecharacterized byinfrared spectroscopy, X-ray powder diffraction (XRD), transmission electronmicroscopy (TEM), scanning electron microscopy (SEM), energy dispersivespectrometer (EDS). Magnetic properties were investigated by spectroscopy Mössbauer and Magnetization measurements obtained at room temperature;magnetization measurements was used a vibrating sample magnetometer (VSM).The microstructural parameters from the X-ray powder diffraction have beendetermined by means of Rietveld analysis; nanoparticle sizes calculated by theScherrer equation and size-strain by Williamson-Hall (W-H) method, using the FullWidth at Half Maximum (FWHM) of the diffraction peaks. The average particlediameter ranges from 4,9nm to 69,5nm. Toxicity tests were performed in vivo todetermine application for NiFe2O4.