Estudo das interações hiperfinas em nanopartículas de Fe3O4 e Fe3O4 dopadas com gadolínio pela espectroscopia de correlação angular perturbada

Content Provider	Semantic Scholar
Author	Huet, Sarah
Copyright Year	2014
Abstract	In the work reported in this dissertation, magnetic nanoparticles of Fe 3O4 and 5% Gddoped Fe3O4, which have applications in biomedicine, were stud ied by Perturbed Gamma-Gamma Angular correlation spectroscopy (PAC). Fe3O4 samples were synthesized by both, co-precipitation and thermal d ecomposition methods. Gd-doped Fe3O4 magnetic nanoparticles were synthesized only by co -precipitation method. Analysis of X-ray diffraction (XRD) showed that the samples belong to Fd3m space group. Transmission Electron Microscopy (TEM) showe d that nanoparticles have sizes between 5 and 14 nm, suitable for biomedical applic ations. Fe3O4 nanoparticles synthesized by thermal decomposition method showed greater monodispersed nanoparticles than the samples synthesized by co-pr ecipitation method. PAC technique using radioactive probe In (Cd) showed that the size of the nanoparticles chang es magnetic behavior and for the Gd-doped sample PAC m easurements results showed that the introduction of radioactive probe is difficult due the presence of an impurity (Gd) and there is a competition for Fe sites between Gd and nuclear probe.
File Format	PDF HTM / HTML
DOI	10.11606/D.85.2014.tde-20062014-132040
Alternate Webpage(s)	http://pelicano.ipen.br/PosG30/TextoCompleto/Sarah%20Damasceno%20Pinheiro%20Huet_M.pdf
Alternate Webpage(s)	https://doi.org/10.11606/D.85.2014.tde-20062014-132040
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article