Abstract
Nano-sized α-Al 2O 3 particles with an average size of 30–40 nm were prepared successfully from supersaturated sodium aluminate solution with liquid-attached aluminum hydroxide and nano-sized α-Al 2O 3 as seeds as well as a reasonable amount of PEG20000 as surfactant. The powders were characterized by differential scanning calorimetry (DSC)/thermogravimetry (TG), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that liquid-attached Al(OH) 3 and nano-sized α-Al 2O 3 seeds can accelerate the precipitating process and reduce the α-Al 2O 3 particles size.
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