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Interactions of graphene oxide with Ag, Cu, Fe, Fe, and Bi ions were studied. The minimum (threshold) ion concentrations required for the interaction with graphene oxide to occur were deter-mined in a series of experiments. A possible model of the interaction between the metal ions and the oxygen-containing groups of graphene oxide was proposed. [ABSTRACT FROM AUTHOR]

Three-dimensional opal-matrix nanocomposites containing various bismuth selenides and tellurides with a particle size from 25 to 150 nm have been produced by reducing oxygen-containing compounds with supercritical isopropanol. The bismuth: chalcogen ratio in the reduction products has been shown to correlate with that in the starting mixtures, indicating that targeted synthesis in opal pores can be used to controllably fabricate nanocomposites. [ABSTRACT FROM AUTHOR]

Bi, Te, and Bi2Te3 nanoparticles have been prepared by reducing bismuth salts, telluric acid, and their decomposition products with supercritical isopropanol in opal pores. [ABSTRACT FROM AUTHOR]

Bismuth nanoparticles have been produced in pores of opal matrices by reducing bismuth salts and oxide compounds with supercritical isopropanol. According to transmission electron microscopy data, the diameter of the SiO2 spheres in the opal matrices is about 260 nm, and that of the bismuth nanoparticles does not exceed 80 nm. [ABSTRACT FROM AUTHOR]