Preparation of composite with silica-coated nanoparticles of iron oxide spinels for applications based on magnetically induced hyperthermia.
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2013
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Resumo
It is reported a novel method to prepare magnetic core (iron oxide
spinels)–shell (silica) composites containing well-dispersed magnetic nanoparticles
in aqueous solution. The synthetic process consists of two steps. In a first step, iron
oxide nanoparticles obtained through co-precipitation are dispersed in an aqueous
solution containing tetramethylammonium hydroxide; in a second step, particles of
this sample are coated with silica, through hydrolyzation of tetraethyl orthosilicate.
The intrinsic atomic structure and essential properties of the core–shell system were
assessed with powder X-ray diffraction, Fourier transform infrared spectrometry,
Mössbauer spectroscopy and transmission electron microscopy. The heat released
by this ferrofluid under an AC-generated magnetic field was evaluated by following the temperature evolution under increasingmagnetic field strengths.Results strongly
indicate that this ferrofluid based on silica-coated iron oxide spinels is technologically
a very promising material to be used in medical practices, in oncology.
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Biomedicine, Nanotechnology, Magnetic hyperthermia, Ferrofluid
Citação
ANDRADE, A. L. et al. Preparation of composite with silica-coated nanoparticles of iron oxide spinels for applications based on magnetically induced hyperthermia. Hyperfine Interactions, v. 218, p. 71-82, 2013. Disponível em: <https://link.springer.com/article/10.1007/s10751-012-0681-9>. Acesso em: 20 abr. 2017.