Abstract
A novel cobalt aluminate (CoAl2O4) nanopigments with bright blue color and good dispersibility was fabricated via a coprecipitation process of threonine. Threonin acts as coordination and structure-directing reagents for the nucleation and assembly of hydroxide precursor, limitation of the CoAl2O4 nanoparticle growth during calcination process, and fine-tuning the molar ratio of Co/Al in final products. The products were characterized with XRD, FESEM, TEM, FTIR, DLS, EDX, ICP-AES and UV-vis. The particle size, colorimetric values and printing ink of CoAl2O4 nanopigments with different amount of threonine and without threonine were investigated. The study exhibited that the CoAl2O4 nanopigments with 0.1–0.2 mol/L threonine showed a smaller size of 10–20 nm, better dispersion and color property than other test samples. The coloration mechanism of the CoAl2O4 nanopigments is also discussed.
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