Abstract
Monodisperse porous α-Al2O3 nanoparticles with variable sizes were prepared by the homogeneous precipitation method and subsequent heat-treatments. The crystalline phases, morphologies and pore size distributions of the samples were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and N2 adsorption/desorption. The diameters of porous α-Al2O3 nanoparticles obtained with an Al3+ concentration of 10mmol/L were in the range of 200–500nm, and the diameters of porous α-Al2O3 nanoparticles obtained with an Al3+ concentration of 0.5mmol/L were in the range of 40–70nm. The pore sizes of porous α-Al2O3 nanoparticles were approximately 6–14nm. The porosity developed during the heating process due to phase transformation and shrinkage of precursor particles. The monodisperse porous α-Al2O3 nanoparticles have great potential to be applied in gas separation, catalyst supports and filters in a high temperature environment.
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