Flame pyrolysis – a preparation route for ultrafine pure γ-Fe2O3 powders and the control of their particle size and properties |
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| Authors: | S GRIMM M SCHULTZ S BARTH R MULLER |
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| Affiliation: | (1) Friedrich Schiller University, Institut fur Anorganische und Analytische Chemie, August-Bebel-Str. 2, D-07743 Jena, Germany;(2) Institut fur Physikalische Hochtechnologie, Helmholtzweg 2, D-07743 Jena, Germany |
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| Abstract: | Highly dispersed γ-Fe2O3 powders with particle sizes down to 5 nm were directly synthesized by combustion of solutions of
iron pentacarbonyl or iron(III) acetylacetonate in toluene in an oxyhydrogen flame. The particle size as well as other properties
of the obtained powders can be controlled simply by varying the iron concentration in the starting solutions. Phase composition,
morphological and magnetic properties of the powders were studied. The reasons for the formation of γ-Fe2O3 are discussed
by means of structure–chemical/kinetic considerations. The materials are interesting as recording materials, or ferrofluids,
or for colour imaging and bioprocessing.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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