An experimental study has been conducted to evaluate the formation of nano a-Al 2 O 3 under various conditions, such as different calcining temperatures and emulsion ratios of aqueous aluminum nitrate solutions and oleic acid with a high-speed stirring mixer. Four batches of the precursor powders were calcined at three different temperatures of 10001, 10501, and 11001C for 2 h and a terminal product of nano a-Al 2 O 3 powders was obtained. The products have been identified by X-ray diffraction (XRD), specific surface area measurement scanning electron microscope, and transmission electron microscope (TEM). The XRD results show that the phase of powders is determined to be a-Al 2 O 3 , indicating that the overall process has been effective. The optimum calcination temperature of the precursor powder for crystallization of nano a-Al 2 O 3 was found to be 10001C for 2 h. The TEM image indicates that the particle grains have a subspherical shape with a mean size of 50-100 nm.
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