Síntese de nanopartículas de óxido de cromo a partir do método Sol-gel protéico

Abstract

A first motivation for the development of materials in the nanometric scale is associated to the possibility that a larger number of them comes to be gathered in devices of very small dimensions, increasing miniaturization and capacity for processing information. 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 sol–gel proteic process using commercial 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. Results using the X-Ray Diffraction technique and structure refinement by Rietveld method in several samples prepared in different temperatures show that the particle size varies between 30nm and 45nm, using salts as source of chrome. Other techniques will be used to complete the characterization: MEV, BET and TEM.