In this work, morphological, structural, magnetic and optical investigations were performed in iron oxide nanoparticles synthesized by chemical methods. Our goal was to correlate the synthesis parameters to the characteristics of the produced particles to improve their quality when compared to commercial samples. Superparamagnetic iron oxide nanoparticles (SPIONs) currently have a surge of interest as their potential has been demonstrated in many applications such as biomedicine, modern technology, diagnostics and molecular biology, among others. Therefore, the functionalization of these particles is a crucial step for these applications. The samples are fluid magnetic (SPIONs) commercial and synthesized by co-preciptation of metal salts in aqueous solution and the thermal decomposition of organometalic precursor with different coatings. These systems were characterized by transmission electron microscopy, X-ray diffraction, UV-Vis spectroscopy, magnetic measurements, Z-Scan technique (thermal diffusivity, nonlinear refractive index), thermo-optic coefficient and thermal conductivity. The results showed that nanoparticles synthesized by the co-precipitation method present advantage over the commercial samples, once they have the less size distribution. Through thermal decomposition of Fe(acac)3, particles with narrower size distribution were produced. The synthesized samples showed better responses to the characterizations, mainly due to its size, which was about five times lower than the commercials. We are in debt to FAPESP, CNPq and Instituto Nacional de Ci�ncia e Tecnologia de Fluidos Complexos (INCT-FCx) for financial support.

Study of optical and structural properties of magnetic fluids

248th National Meeting (2014)

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