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Co3O4 powders are used as pigment in solar selective paints. In this work, two new gel-combustion processes for the synthesis of  Co3O4 nanopowders with lysine (Lys) or ethylenediaminetetraacetic acid (Edta) as fuel are presented. The first route is a  conventional, stoichiometric process, while the second one is a non-stoichiometric, pH-controlled process. The samples were  calcined in air at 500 ºC. They were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM),  transmission electron microscopy (TEM), Fourier transform infrared spectrum (FTIR), Thermogravimetric analysis (TGA) and  differential scanning calorimetry (DSC) and the optical properties of the pigments were assessed with a spectrophotometer. In all  cases, powders exhibited the Co3O4 crystalline structure. A minimum crystallite average size of 19 nm for powders obtained by  the ?stoichiometric/Lys? combustion route was observed, meanwhile, a maximum value of 47 nm was stated for powders  obtained by the ?non-stoichiometric/Edta? combustion process. The average particle size ranged between 50 and 100 nm. The  powders obtained by the stoichiometric nitrate?lysine route were selected to study its optical properties, their solar absorption  was 88%, compared with the references, evidencing their aptitude to be used in solar absorbent paints.Fil: Gardey Merino, Maria Celeste. Universidad Tecnologica Nacional. Facultad Reg.mendoza. Grupo Cliope Energia, Ambiente y Desarrollo Sustentable; ArgentinaFil: Tornello Nasisi, Leonardo D.. Universidad Tecnologica Nacional. Facultad Reg.mendoza. Grupo Cliope Energia, Ambiente y Desarrollo Sustentable; ArgentinaFil: Montoya, William M. . Universidad Tecnologica Nacional. Facultad Reg.mendoza. Grupo Cliope Energia, Ambiente y Desarrollo Sustentable; ArgentinaFil: Urrutia Aguilera, Jesus N. . Universidad Tecnologica Nacional. Facultad Reg.mendoza. Grupo Cliope Energia, Ambiente y Desarrollo Sustentable; ArgentinaFil: Fernandez, Maria Emilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas de las Fuerzas Armadas. Centro de Investigaciones en Sólidos; ArgentinaFil: Lascalea, Gustavo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Vazquez, Patricia Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentin

Combustion Syntheses of CoAl2O4 Powders Using Different Fuels