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CoAl 2 O 4 Nano Pigment Obtained by Combustion Synthesis
Author(s) -
Salem Shiva,
Jazayeri Seyed Hamid,
Bondioli Federica,
Allahverdi Ali,
Shirvani Mansoor,
Ferrari Anna Maria
Publication year - 2012
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2011.02704.x
Subject(s) - calcination , materials science , glaze , crystallite , differential thermal analysis , bet theory , thermogravimetric analysis , spinel , particle size , specific surface area , pigment , transmission electron microscopy , combustion , chemical engineering , analytical chemistry (journal) , mineralogy , nuclear chemistry , diffraction , nanotechnology , metallurgy , adsorption , catalysis , chromatography , chemistry , optics , organic chemistry , ceramic , physics , engineering
The aim of this research was to study the influence of pH (2.5, 7, 10.5), molar ratio of fuel to nitrates (0.36, 0.56, 0.75), and calcination temperature (600, 800, 1000, 1200°C) on the characteristics of CoAl 2 O 4 nano pigments synthesized using a solution‐based combustion method. Gel formation, morphology, specific surface area, and color of the powder were characterized using TG – DTA (thermogravimetric and differential thermal analysis), XRD ( X ‐ray diffraction), TEM (transmission electron microscopy), BET ( B runauer– E mmett– T eller), and UV – V is. The results indicate that spinel CoAl 2 O 4 was formed independently of the different variables studied and that higher temperature promotes crystallite size. According to the TEM micrographs, most of particles calcined at 800 and 1000°C have average particle sizes <30 and 75 nm, respectively. Consistent with BET results, maximum specific surface area was obtained at pH of 7. Colorability tests demonstrate that the mixtures of glaze and calcined nano pigments are still dark blue after heating up to 1200°C.