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Synthesis of Fe(OH) 3 Microtubes at the Gas–Solution Interface and Their Use for the Fabrication of Fe 2 O 3 and Fe Microtubes
Author(s) -
Gulina Larisa,
Tolstoy Valeri,
Kuklo Leonid,
Mikhailovskii Vladimir,
Panchuk Vitaly,
Semenov Valentin
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800182
Subject(s) - chemistry , aqueous solution , annealing (glass) , reagent , amorphous solid , ascorbic acid , hydrogen , chemical engineering , fabrication , inorganic chemistry , analytical chemistry (journal) , crystallography , organic chemistry , metallurgy , materials science , medicine , alternative medicine , food science , pathology , engineering
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 FeCl 2 /FeCl 3 /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 α‐Fe 2 O 3 ones by annealing in air. As a result of thermal hydrogen reduction, α‐Fe microtubes were formed. Both the annealing in air and reduction in a hydrogen flow at a temperature of 1,000 °C preserve the tubular morphology of the product. The microtubes synthesized were characterized by optical and scanning microscopy, structural and compositional analyses, and Mössbauer spectroscopy. A hypothesis is proposed about the model of microtube formation resulting from the chemical reaction at the gas–solution interface.