Reference Presenter Authors
08-056 Ana Laura Caseiro Caseiro, A.(Universidade Federal de São Carlos); Togashi, M.M.(Universidade Federal de São Carlos); Perdomo, C.F.(Universidade Federal de São Carlos); Kiminami, R.H.(Universidade Federal de São Carlos); Magnetite (Fe3O4) has great technological importance because it shows good magnetic properties and can be used in applications such as microelectronics, pigments and in the biomedical area, in the administration of medicine, and the enhancement of magnetic resonance imaging. Nanoparticle synthesis using the sol-gel method ensures high purity for nanopowders, excellent stoichiometric control and mainly its reproducibility. The use of polyacrylic acid (PAA) as a chelating agent in the synthesis, instead of ethyl alcohol or citric acid, shows an important advantage: more active sites, making this a differential in the productivity and eliminating the aging step of the gel. Therefore, the aim of this paper was to synthesize magnetite on a nanometric scale, using the modified sol-gel method with polyacrylic acid as a chelating agent. After thermal analysis by differential scanning calorimetry and thermogravimetry, the obtained gel was calcined to obtain the crystalline phase of the magnetite. The obtained material was characterized by X-ray diffraction, transmission and scanning electron microscopy and by the surface area analysis method. The results showed that the crystalline phase of the magnetite at low temperatures, below 250 °C, with an average particle size of around 50 nm, corroborated that the modified sol-gel method used in this study was very efficient and reproducible.
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