Browsing by Author "Gutiérrez, Delia"
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Item Comparación de la morfología y microestructura de polvos de zirconio y zirconio estabilizada con ytria, sintetizados por dos métodos de síntesis vía húmeda(2004) Rodríguez, María R.; Marí, Eduardo; Gutiérrez, Delia; Reverón, Helen; Arellano, L.; Mijares, A.; Gerencia Tecnológica y/o Tecnología; Departamento de Química; Facultad de CienciasItem Hidrotermal route produces doped ceria. Powders and Nano Ceramics(2004) Rodríguez, Rosa M.; García, Isabella; Gutiérrez, Delia; Reverón, Helen; Gerencia Tecnológica y/o Tecnología; Departamento de Química; Facultad de CienciasItem Influencia de un agente dopante (sal de cerio) en la síntesis de polvos de zirconio nanométrica, a través de un método hidrotérmico micro-onda(2004) Rodríguez, Rosa María; García, Isabela; Reverón, Helen; Gutiérrez, Delia; Gerencia Tecnológica y/o Tecnología; Departamento de Química; Facultad de CienciasResumenItem Síntesis de polvos de zirconio estabilizada con ytria a través de un proceso de descomposición térmica(2003) Reverón, Helen; Gutiérrez, Delia; Rodríguez, Rosa María; Marí, Eduardo; Gerencia Tecnológica y/o Tecnología; Departamento de Química; Facultad de CienciasItem Synthesis and characterizatio of transition aluminas from recycled scrap aluminium(2019) Rodríguez, Rosa María; Gutiérrez, Delia; Saab, Elvira; Labrador, Norberto; Hung, Xavier; Palma, Carlos; Gerencia Tecnológica y/o Tecnología; Departamento de Química; Facultad de CienciasThe aim of this study was to develop an alternative methodology for the synthesis of transition aluminas, in order to reduce ecological costs by using recycled metal scrap as raw material (cans of soft drinks) and generate a product with high added value. The synthesis technique employed yielded a precursor comprised of 55.4 % of bayerite, 41.2 % of boehmite, and ammonium salt, according the characterization performed with X-ray diffraction and quantification by the Rietveld method. The ammonium chloride salt present is not relevant for the process, since given its solubility in water, it could be eliminated by successive washing. Scanning electron microscopy evaluations showed the presence of agglomerates of particles between 50 and 300 μm. A bimodal grain sizes distribution was detected during the laser granulometric test. Thermogravimetric analysis of the precursor indicated a 40.6 % total weight loss at 1000 ºC. The heat treatments at 350 and 750 ºC of precipitates for 1, 2 and 4 h, produced various transition aluminas (γ, η, θ), which are products where value has been added and might have a potential use as binders in monolithic products, catalyst support, or additives for puzzolanic materials, among others.