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Iron nanowires (NWs) were obtained by template synthesis using polymer track membranes in the framework of development of a general method for the synthesis of regular metal nanostructures. The surface topography of NWs was studied by scanning electron microscopy, and the local state of iron atoms was determined by Mössbauer spectrometry. [ABSTRACT FROM AUTHOR]

The study of the magnetic susceptibility of iron-oxygen quasi-two-dimensional nanostructures (nanolayers) showed that the dependence of the susceptibility on the number of iron-oxygen groups deposited on a silica support is nonmonotic. It was found that a two-dimensional magnetization region arises at a certain number of iron-oxygen groups in the surface layer of the support. [ABSTRACT FROM AUTHOR]

Multiplex dependence of the magnetic susceptibility of iron and titanium-oxygen two-dimensional nanostructures on the amount of metal-oxygen groups deposited on a silica surface was found. The effect of two-dimensional ferrimagnetism was observed. Its appearance is explained by the existence of magnetization areas arising only for certain amounts of Fe-O groups in the surface layer of silica. In the case of samples containing surface Ti-O groups, the structure-induced magnetic effect was observed. Such an effect is caused by an increase of the diamagnetism polarizing component and by the ordering action of silica support on Ti-O bonds. [ABSTRACT FROM AUTHOR]

Structural-chemical transformations of quasi-two-dimensional iron-oxygen nanostructures occurring at transport reduction were studied using NGR spectroscopy. It has been found that isolated iron-oxygen groups [i.e. groups containing iron and oxygen atoms: ≡ Si-O-Fe(OH)[sub 2] and (≡Si-O-)[sub 2]-FeOH] forming surface monolayers were not reduced at T = 400-600°C because of their covalent bonding with the silica surface. Reduction of iron oxide microparticles (microstructures) at T ≥ 600°C resulted in the formation of metal iron in the form of α-Fe. It has been revealed that in the course of transport reduction (TR) of the samples with deposited monolayers (one or four monolayers) at T ≥ 600°C bulk phases of iron silicate and metal iron were formed. It has also been shown that the features of structural-chemical transformations of supported iron-oxygen nanolayers were in relation with the specific character of phase formation within nanoscale structures. [ABSTRACT FROM AUTHOR]