Carbonation effect on the synthesis of highly crystalline γ-alumina nanopowders

被引：6

作者：

Ghamsari, M. Sasani ^{[1
,2
]}

Abdul-Hamid, M. A. ^{[1
]}

Radiman, S. ^{[1
]}

Ghamsari, A. H. Sasani ^{[2
]}

Rahmani, Sh. ^{[2
]}

机构：

[1] Natl Univ Malaysia UKM, Fac Sci & Technol, Sch Appl Phys, Bangi 43600, Selangor, Malaysia

[2] NSTRI, Laser & Opt Res Sch, Tehran 111553486, Iran

来源：

MATERIALS LETTERS | 2013年 / 106卷

关键词：

Sol-gel preparation; Nanocrystalline materials; Carbonation process; gamma-alumina; HYDROTHERMAL SYNTHESIS; STRUCTURAL MODELS; GAMMA-AL2O3; HYDROLYSIS; BOEHMITE; MECHANISM; NANORODS; ROUTE; SALTS; DFT;

D O I：

10.1016/j.matlet.2013.05.034

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The sol-gel method has been used for preparation of highly crystalline gamma-alumina with cubic structure. Aluminum chloride, ethanol, and water were selected as starting materials. CO2 gas was used to control the chemical pathway of gamma-alumina production to occur with a desirable microstructure. The phase transformation from boehmite to gamma-alumina has been evaluated by annealing the prepared sample at different temperatures. FTIR and X-ray diffraction were used to identify the organic compounds of prepared sol and the crystalline phase of synthesized powders. Transmission electron microscopy (TEM) study was carried out to show the size and morphology of prepared powders. Experimental results confirmed that the phase transformation from gamma- to alpha-alumina shifted to lower temperatures (<1200 degrees C) and a new transformation sequence of alumina was observed. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：439 / 442

页数：4

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