期刊
CERAMICS INTERNATIONAL
卷 47, 期 7, 页码 9771-9778出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.12.117
关键词
Al2O3 nanoparticles; Precipitation method; Morphology; Composite
资金
- Key R & D Program of Shandong Province [2019GSF109071]
This paper reported the preparation of alpha-Al2O3 nanoparticles with good dispersity and controllable morphology by lowering temperature calcination of the precipitated precursor powders. The composite composed of PVP and ammonium sulfate is used to control the morphology and improve the precursor's dispersion. The resultant alpha-Al2O3 nanoparticles prepared by such a simple method were expected to be applied in transparent ceramics and high-performance catalysts.
alpha-Al2O3 nanoparticles are easy to agglomerate in the preparation, thereby leading to adverse effects during the applications. This paper reported the preparation of alpha-Al2O3 nanoparticles with good dispersity and controllable morphology by lowering temperature calcination of the precipitated precursor powders. The composite composed of PVP and ammonium sulfate is used to control the morphology and improve the precursor's dispersion. The influences of R ((NH4)(2)CO3/Al3+, molar ratio) and PVP-ammonium sulfate composite were studied thoroughly. It was found that an urchin-shaped ammonium aluminum carbonate hydroxide (AACH) precursor can be formed under the conditions of R = 3, and the ammonium sulfate and PVP are 20 wt% and 5 wt %, respectively. After calcination at 1000 degrees C for 2 h, such urchin-like precursor particles were converted to quasi spherical and well crystallized alpha-Al2O3 nanoparticles, which possessed a narrow size distribution of 110 nm and a specific surface area of 12.13 m(2)/g. The resultant alpha-Al2O3 nanoparticles prepared by such a simple method were expected to be applied in transparent ceramics and high-performance catalysts.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据