Iron oxide-silica aerogel and xerogel nanocomposite materials

被引:37
|
作者
Casula, MF [1 ]
Corrias, A [1 ]
Paschina, G [1 ]
机构
[1] Univ Cagliari, Dipartimento Sci Chim, I-09042 Cagliari, Italy
关键词
D O I
10.1016/S0022-3093(01)00641-X
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The sol-gel method was used to prepare iron oxide-silica nanocomposite materials. Different drying conditions were used in order to obtain aerogel and xerogel materials. The samples were characterized by thermal analysis, X-ray diffraction (XRD), N-2-physisorption and transmission electron microscopy (TEM) techniques. Aerogel samples have a much higher surface area than the xerogel samples; moreover, different supercritical drying conditions give rise to a different porous structure. The stabilization of the maghemite phase in the xerogel nanocomposites depends on the iron content and it is more difficult in the aerogel samples. The early sol-gel preparation stages also play an important role. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:25 / 31
页数:7
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