Abstract
The Fe2+/Fe3+ ratio in two-dimensional iron oxide nanosructures (nanolayers with a thickness of 0.3–1.5 nm on silica surface) may be precisely controlled using the transport reduction (TR) technique. The species ≡–O–Fe(OH)2 and (≡Si–O–)2–FeOH forming the surface monolayer are not reduced at 400–600°C because of their covalent bonding to the silica surface, as demonstrated by Mössbauer spectroscopy. Iron oxide microparticles (microstructures) obtained by the impregnation technique, being chemically unbound to silica, are subjected to reduction at T ≥ 500°C with formation of metallic iron in the form of α-Fe. Transport reduction of supported nanostructures (consisting of 1 or 4 monolayers) at T ≥ 600°C produces bulk iron(II) silicate and metallic iron phases. The structural-chemical transformations occurring in transport reduction of supported iron oxide nanolayers are proved to be governed by specific phase processes in the nanostructures themselves.
References
Aleskovskii V.B., 1996. Khimiya Nadmolekulyarnykh Soedinenii (Chemistry of Supermolecular Compounds), St.-Petersburg State University Press, St. Petersburg (in Russian).
Aleskovskii V.B., V.G. Povarov, V.M. Smirnov & S.S. Pershin, 1988. Dokl. Chem. 303, 1393.
Charlot G., 1961. Les Methods de la Chemie Analytique. Analyse quantitative Minerale, Quatrieme Edition, Masson, Paris.
Chernavskii P.A., V.V. Kiselev, A.P. Kuprin, A.P. Grechenko, L.I. Baranova & V.V. Lunin, 1991. Zh. Fiz. Khim. 65, 1675.
Gusarov V.V., Zh.N. Ishutina, A.A. Malkov & A.A. Malygin, 1997. Dokl. Chem. 357, 203.
Haberland H., ed., 1994. Cluster of Atoms and Molecules. Springer Series of Chem. Phys. V. 52. Springer-Verlag, Berlin.
Kol'tsov S.I., V.G. Korsakov & V.M. Smirnov, eds., 1985. Praktikum po khimii tverdykh veshchestv (Experiments in Chemistry of Solids) (in Russian). Leningrad State University Press, Leningrad.
Kunding W., J.A. Cape, R.N. Lindquist & G. Constabaris, 1967. J. Appl. Phys. 38, 947.
Malygin A.A., A.A. Malkov & S.D. Dubrovenskii, 1996. In: Dabrowski A. and Tertykh V.A. eds., Adsorption on New and Modified Inorganic Sorbents (Studies in Surface Science and Catalysis, Vol. 99), Elseivier: Amsterdam, 213.
Murin I.V., V.M. Smirnov, G.P. Voronkov, V.G. Semenov, V.G. Povarov & B.M. Sinel'nikov, 2000. Solid State Ionics 133, 203–210.
Nayk S.K & R. Ramaswsrry, 1994. J. Phys. Chem. 98, 9260.
Povarov V.G., G.P. Voronkov & V.M. Smirnov, 1993. Zh. Prikl. Khim. 1972.
Prigogine I. & S. Rice, eds., 1988. Evolution of Size Effect in Chemical Physics. Part 2. Wiley, New York.
Roslyakova N.G. & V.B. Aleskovskii, 1966. Zh. Prikl. Khim. 4, 795.
Smirnov V.M., 1996. Khimiya Nanostruktur. Sintez, Stroenie, Svoistva (Chemistry of Nanostructures. Synthesis, Structure, Properties), St.-Petersburg State University Press, St. Petersburg (in Russian).
Smirnov V.M., R.R. Rachkovskii & G.P. Voronkov, 1993. Zh. Obshch. Chim. 63, 278.
Smirnov V.M., N.P. Bobrysheva & V.B. Aleskovskii, 1997. Dokl. Chem. 356, 492.
Suzdalev I.P & A.Kh. Trautvain, 1996. Khim. Fiz. 15, 96–102.
Terent'ev A.P. & A.I. Kireeva, 1951. Izv. Akad. Nauk SSSR, Khim. Ser. 2, 172.
Wielers A.F.H., A.J. Kock & C.E. Hop, 1989. J. Catal. 117, 1.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Smirnov, V.M., Povarov, V.G., Voronkov, G.P. et al. Solid-state Water-mediated Transport Reduction of Nanostructured Iron Oxides. Journal of Nanoparticle Research 3, 83–89 (2001). https://doi.org/10.1023/A:1011432925809
Issue Date:
DOI: https://doi.org/10.1023/A:1011432925809