期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 293, 期 -, 页码 25-31出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-3093(01)00641-X
关键词
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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.
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