分散性
材料科学
纳米颗粒
多孔性
扫描电子显微镜
透射电子显微镜
化学工程
多孔介质
纳米技术
复合材料
高分子化学
工程类
作者
Xinghua Su,Shuanfa Chen,Zhenjun Zhou
标识
DOI:10.1016/j.apsusc.2012.02.067
摘要
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 10 mmol/L were in the range of 200–500 nm, and the diameters of porous α-Al2O3 nanoparticles obtained with an Al3+ concentration of 0.5 mmol/L were in the range of 40–70 nm. The pore sizes of porous α-Al2O3 nanoparticles were approximately 6–14 nm. 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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