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• W2339494813 abstract "Solar selective paints, with the addition of Co3O4 as a pigment, are used to improve energetic efficiency in solar collectors. Although Co3O4 has been obtained by different methods, references about combustion synthesis are scarce. Co3O4 powders have been synthesized by stoichiometric and non-stoichiometric routes using aspartic acid (Asp) or tri-hydroxi-methyl-aminomethane (Tris) as fuels. The samples were calcined in air at 500 °C. They were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, differential scanning calorimetry, Fourier transform infrared spectrum and the specific surface area of the samples was determined by means of the Brunauer–Emmett–Teller technique. The optical properties of pigments were assessed by means of a spectrophotometer. In all cases, powders exhibited the crystalline structure of Co3O4. A minimum crystallite average size of 29 nm was observed for powders obtained by the “stoichiometric/Asp” combustion route, while a maximum value of 41 nm was stated for powders obtained by the “nonstoichiometric/Asp” combustion process. The average particle size ranged between 50 and 100 nm. The powders obtained by the “stoichiometric/Asp” method were selected to study their optical properties; their solar absorption value was 86%. Solar selective surfaces composed by Co3O4 pigments and an alkyd resin were obtained and applied over copper or aluminum substrates. In both" @default.
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• W2339494813 date "2015-01-01" @default.
• W2339494813 modified "2023-09-27" @default.
• W2339494813 title "International Congress of Science and Technology of Metallurgy and Materials, SAM - CONAMET 2014 Combustion synthesis of ultrafine powders of Co3O4 for selective surfaces of solar collectors" @default.
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