PERSONAL DE APOYO
LASSA Maria Silvina
artículos
Título:
Combustion Syntheses of CoAl2O4 Powders Using Different Fuels
Autor/es:
MARÍA CELESTE GARDEY MERINO; ALFREDO L. ESTRELLA; MARINA RODRIGUEZ; LEANDRO ACUÑA; LASSA MA SILVINA; GUSTAVO E. LASCALEA; PATRICIA VÁZQUEZ
Revista:
procedia materials science
Editorial:
elsevier
Referencias:
Año: 2015
ISSN:
2211-8128
Resumen:
This
research intends to analyse the potential use of CoAl2O4
as an opaque pigment for solar collector selective paints. The opacity of the
pigment occurs when the average crystallite size is micrometric. The CoAl2O4
samples were synthesized through combustion methods using aspartic acid (Asp)
or lysine (Lys) as fuels. The powders obtained were calcined at temperatures
between 600°C and 1100°C. Afterwards, the product was characterized by means of
X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission
electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR).
It was observed a CoAl2O4 phase in all the samples. The
lowest average crystallite size was ≈24nm corresponding to the sample obtained
with Asp and calcined at 600°C, while both powders calcined at 1100°C showed
sizes higher than 200nm. In the light of these results it is suggested the use
of even higher calcination temperatures so as to obtain opaque pigments for
solar collectors selective paints.