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Issue 4, 2003
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Magnetic Fe2O3–Al2O3 composites prepared by a modified wet impregnation method

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Abstract

Fe2O3–Al2O3 composites were prepared by interaction of acetic acid vapors with iron oxides dispersed on the surface of a sol–gel derived porous alumina. Upon pyrolysis the created iron acetate species were transformed to magnetic iron oxide nanoparticles. The atmosphere which is used during the synthetic procedure affects significantly the nature of the nanoparticles which could be either γ-Fe2O3 or magnetite, or non-magnetic such as α-Fe2O3. X-Ray diffraction, surface area measurements and scanning electron microscopy (SEM) were used for the structural characterization and determination of the sorption properties of the composite material properties. The development of magnetic phases decreases the specific surface area of alumina by seeding of the alumina particles and, in parallel, the coverage of their free surface. Mössbauer spectroscopy, magnetic measurements and transmission electron microscopy (TEM) provide evidence for the formation, size and type of magnetic iron oxide phases.

Graphical abstract: Magnetic Fe2O3–Al2O3 composites prepared by a modified wet impregnation method

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Publication details

The article was received on 19 Nov 2002, accepted on 27 Jan 2003 and first published on 18 Feb 2003


Article type: Paper
DOI: 10.1039/B211330A
Citation: J. Mater. Chem., 2003,13, 871-876

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    Magnetic Fe2O3–Al2O3 composites prepared by a modified wet impregnation method

    M. A. Karakassides, D. Gournis, A. B. Bourlinos, P. N. Trikalitis and T. Bakas, J. Mater. Chem., 2003, 13, 871
    DOI: 10.1039/B211330A

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