Síntese e caracterização de nanopartículas de maguemita recobertas com sílica funcionalizada com grupos amina
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Data
2008-11-25
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Universidade Federal de Goiás
Resumo
Magnetic nanoparticles coated with several kinds of materials have been the
focus of intense research due to their potential applications in biomedicine. This
type of material contains a magnetic core that is involved by a shell of different
composition. The coating of magnetic nanoparticles with amino-functionalized
silica is particularly important because of its reactivity which allows the coupling
with biological molecules such as fragments of DNA, antibodies, proteins,
among others. In this work, maghemite nanoparticles were coated with silica
and with amino-functionalized silica, the incorporation of them being achieved
by using tetraethoxysilane (TEOS) and aminopropyltrimethoxysilane (APTS) as
the precursors of the sol-gel system. Firstly, the magnetic fluids of maghemita
were prepared and afterwards they were employed in the silica-coating
procedures which were based on the Stöber method. Some experimental
parameters were varied, such as the number of maghemita nanoparticles, pH of
the reaction medium, time of reaction and amount of TEOS, with the aim of
modulating the characteristics of the solids and obtaining stable aqueous
suspensions of the materials. All products were analyzed by the following
techniques: X- ray diffraction, diffuse reflectance infrared spectroscopy,
dynamic light scattering, electrophoretic mobility (zeta potential) and
transmission electron microscopy.
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Citação
ALMEIDA, Michelly Patrícia Santana de. Synthesis and characterization of sililca coated nanoparticles functionalized with anime groups. 2008. 82 f. Dissertação (Mestrado em Educação em Química) - Universidade Federal de Goiás, Goiânia, 2008.