Abstract
Submicron spherical CoAl2O4 pigments were hydrothermal synthesized using CoCl2· 6H2O and AlCl3 as raw materials, NaOH as the precipitant and diethanolamine (DEA) as capping agent, respectively. The effect of the concentration of raw materials, the ratio of nCo/nAl and the amount of DEA on the phase composition, particle size and morphology as well as the chroma of the as-prepared pigments was investigated by means of XRD, TEM and calorimetric analysis. The results show that submicron spherical CoAl2O4 pigments with size in a range of 100-230 nm could be synthesized under the conditions of nCo/nAl= 1: 2, Co concentration 0.05 mol/L and DEA 12%(V/V). The formation of spherical particles was analyzed from the point of view of kinetically controlled crystal growth in the presence of DEA. It follows that during the nucleation and growth process of the crystalline particles, DEA molecules can be adsorbed onto the edges and vertices of the particles in a highly oriented manner thus causing steric hindrance, which enable the spherical growth of the crystalline particles to be possible.
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