Resumen

VEGA, Jaime; PICASSO, Gino; AVILES FELIX, Luis  y  LOPEZ, Alcides. Influence of synthesis experimental parameters on the formation of nanoparticles of magnetite prepared by thermal decomposition method. Rev. Soc. Quím. Perú [online]. 2013, vol.79, n.4, pp.331-347. ISSN 1810-634X.

In this work, nanoparticles based on magnetite have been synthesized by thermal decomposition via solvent-controlled synthesis in polyols, using triethylene glycol (TREG). The starting precursor were solutions of nitrate and acetatylacetonate of Fe. The samples have been characterized by X-ray diffraction technique (XRD), adsorptiondesorption of N₂ (BET equation model), scanning electronic microscopy (SEM), thermogravimetric analysis (TGA), vibration sample magnetometry (VSM) and Mössbauer spectroscopy. XRD difractogramms revealed the majority presence of spinel-like structural phases of magnetite in all samples. SEM micrographs showed morphological differences; the samples prepared from acetatylacetonate presented good dispersion of particles whereas the ones prepared from nitrate - small agglomerations. BET isotherms of samples depicted a mesoporous profile which corresponded to IV type. TGAthermogramms showed two defined regions which corresponded to vaporization of polyol light fractions and TREG. Zero coercivity on the magnetization curve of acetatylacetonate precursor samples have been observed by VSM, which indicates superparamagnetic behavior. Mössbauer spectra of samples detected the presence of 4 doublet-like subspectra due to the presence of 4 sites occupied by Fe in paramagnetic or superparamagnetic state.

Palabras clave : Nanoparticles of magnetite; thermal decomposition; polyol solvent.

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