SÃNTESE E CARACTERIZAÃÃO DE NANOPARTÃCULAS DE Cr2O3 ATRAVÃS DO MÃTODO SOL-GEL PROTÃICO / SYNTESIS AND CHARACTARIZATION OF Cr2O3 NANOPARTICLES USING SOL-GEL PROTEIC METHOD

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In the last years, nanoparticles have becoming important to several researchers. This research reside in the fact that new and uncommon physical and chemical properties, absent in the same material in macro and microscopic size, are observed in this new scale. The subject of this study is obtaining chromium oxide nanoparticles (Cr2O3) by solâgel proteic process using gelatin as an organic precursor. This process appears as a new alternative for the synthesis of oxides for great applications with high efficiency and low cost. The interest in that material is due to the several applications such as green pigments, coverings of materials for thermal protection and mainly as catalyst of countless products originating from of the industry of the petroleum, among others. This new route, using chromium salt as chromium source, produces nanoparticles with average particle size between 20 and 60nm. These values were obtained for different crystallographic direction by means of X-Ray Diffraction (XRD) technique and the structure refinement by Rietveld method were applied in several samples prepared at different temperatures. Other techniques have been used in order to complement the XRD results.

ASSUNTO(S)

oxido de cromo chromium oxide nanoparticles nanopartÃculas engenharia de materiais e metalurgica nanopartÃculas metÃlicas

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