Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 17, Pages 1842-1846Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201800182
Keywords
Amorphous materials; Interfaces; Oxides; Iron; Microtubes
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Funding
- Russian Science Foundation [16-13-10223]
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A straightforward and effective method is reported for obtaining microtubes of iron-based compounds by interfacial interaction between a solution and gaseous reagents. A thin amorphous film of Fe(OH)(3) was synthesized on the surface of a mixed FeCl2/FeCl3/ascorbic acid aqueous solution as a result of the interaction with gaseous ammonium. When dried in air, the film was oxidized and transformed into microtubes. These Fe(OH)(3) microtubes were converted into -Fe2O3 ones by annealing in air. As a result of thermal hydrogen reduction, -Fe microtubes were formed. Both the annealing in air and reduction in a hydrogen flow at a temperature of 1,000 degrees C preserve the tubular morphology of the product. The microtubes synthesized were characterized by optical and scanning microscopy, structural and compositional analyses, and Mossbauer spectroscopy. A hypothesis is proposed about the model of microtube formation resulting from the chemical reaction at the gas-solution interface.
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