The properties of aerogel and xerogel iron oxide-silica nanocomposites prepared by the sol-gel method were investigated by thermal analysis, X-ray diffraction, transmission electron microscopy, Mössbauer spectroscopy and susceptibility measurements. Pure maghemite nanoparticles were obtained starting from both xerogel and aerogel samples, with particles of average size around 5 nm which tend to aggregate into the silica matrix. The role of magnetic interparticle interactions, which have a strong influence on the magnetic properties, is discussed.
Magnetic properties of gamma-Fe2O3-SiO2 aerogel and xerogel nanocomposite materials / C. Cannas, M.F. Casula, G. Concas, A. Corrias, D. Gatteschi, A. Falqui, A. Musinu, C. Sangregorio, G. Spano. - In: JOURNAL OF MATERIALS CHEMISTRY. - ISSN 0959-9428. - 11:12(2001), pp. 3180-3187. [10.1039/b104562h]
Magnetic properties of gamma-Fe2O3-SiO2 aerogel and xerogel nanocomposite materials
A. Falqui;
2001
Abstract
The properties of aerogel and xerogel iron oxide-silica nanocomposites prepared by the sol-gel method were investigated by thermal analysis, X-ray diffraction, transmission electron microscopy, Mössbauer spectroscopy and susceptibility measurements. Pure maghemite nanoparticles were obtained starting from both xerogel and aerogel samples, with particles of average size around 5 nm which tend to aggregate into the silica matrix. The role of magnetic interparticle interactions, which have a strong influence on the magnetic properties, is discussed.
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