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75 results on '"Costa, A.F."'

57. GENETIC DIVERSITY IN CACTUS CLONES USING ISSR MARKERS

Author

Souto Alves, T., primary, Vanusa da Silva, M., additional, Alves de Almeida, C.M., additional, Oliveira Jordão do Amaral, D., additional, Cordeiro dos Santos, D., additional, Farias, I., additional, Tenório Sabino Donato, V.M., additional, and da Costa, A.F., additional

Published
2009
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63. Gelatin synthesis of CuFe2O4 and CuFeCrO4 ceramic pigments.

Author

Costa, A.F., Pimentel, P.M., Aquino, F.M., Melo, D.M.A., Melo, M.A.F., and Santos, I.M.G

Subjects
*GELATIN, *COPPER oxide, *CERAMIC metals, *INORGANIC synthesis, *X-ray diffraction, *CHEMICAL precursors
Abstract

Abstract: In the present study, CuFe2O4 and CuFeCrO4 spinels were synthesized using a method, which makes use of gelatin as an organic precursor in order to assess the applicability as ceramic pigments. Powders resulting from the synthesis process were calcined between 500 and 900°C and characterized by X-ray diffraction (XRD), infrared spectroscopy, scanning electron microscopy (SEM), UV–vis spectroscopy and Colorimetry analysis. Results showed brown color for the CuFeCrO4 spinel and darker colors, from brown to black, for CuFe2O4. This is an interesting finding due to the great importance of black pigments in the ceramic industry. [Copyright &y& Elsevier]

Published
2013
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74. Characterization and thermal behavior of PrMO3 (M=Co or Ni) ceramic materials obtained from gelatin

Author

Aquino, F.M., Melo, D.M.A., Pimentel, P.M., Braga, R.M., Melo, M.A.F., Martinelli, A.E., and Costa, A.F.

Subjects
*PEROVSKITE, *GELATIN, *THERMAL properties of metals, *PRASEODYMIUM, *METALLIC oxides, *METAL catalysts, *MAGNETIC properties of metals, *ELECTRIC properties of metals
Abstract

Abstract: Metal oxides with perovskite-type structure have attracted considerable interest in recent years due to their magnetic and electrical properties, as well as their catalytic activity. In this study, oxides with PrNiO3 and PrCoO3 composition were prepared by using gelatin powder as a precursor agent for its use as a catalyst. The powders obtained were calcined at 700°C and 900°C and characterized using the X-ray diffraction, thermal analysis (thermogravimetry and differential thermal analysis), infrared spectroscopy, temperature programed reduction and scanning electron microscopy techniques. Thermogravimetric data using the non-isothermal kinetic models of Flynn and Wall and “Model-free Kinetics” were used to determine the activation energy to study the decomposition kinetics of the ligand groups with system''s metallic ions that takes part in the synthesis of PrMO3 (M=Ni or Co). [Copyright &y& Elsevier]

Published
2012
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