Síntesis de cerámicos tecnológicos mediante métodos de combustión de geles de acrilamida

Resumo

Concerning to the oxide synthesis, nanoparticle obtention seems to be an interesting alternative to traditional synthesis methods because the specific surface increase alows an improvement of sintering and other surface-related properties. We used acrylamide gel combustion methods to obtain different materials as superconductive oxides, ionic and mixed conductors, magnetic spinels, etc. Departing from a solution provides higher chemical and structural homogeneity than traditional routes, while the combustion scheme brings the hability of large batch production. In this work we used the design of experiments to determine which, from all possible variables, are statisticaly relevants with the mínimum number of experiments. The conclusions of this study was applied to the synthesis of metalic oxides with technological interest as: Ionic conductors, Mixed conductors, Magnetic oxides, Magnetorresistive oxides, Superconductive oxides. In further chapters we try to avoid acrylamide toxicity using polyacrylamide as gel former. Finally we designed and tested a spray-pirolisis device as the way to scale the process to pre-industrial scale. "