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Omel'chuk A.A.,Vernadskii Institute of General and Inorganic Chemistry
Russian Journal of Electrochemistry | Year: 2010

Results of studying how the composition of metal and salt phases depends on electrorefining conditions and duration are shown. It is demonstrated that the existing designs of electrolyzers with liquid electrodes fail to provide the uniform distribution of current density over electrode surfaces thus favoring the complicated distribution of molten electrolyte components throughout the electrolyzer volume. This makes it impossible to assess a priori the content of impurities in the refined metal and in the fused electrolyte. An empiric method is proposed for assessing the time of electrolysis up to the production of a metal of desired purity as well as the concept of an electrolyzer that rules out the nonuniform current density distribution. To minimize the transfer of impurity metals from anode to cathode, the use of a porous auxiliary electrode is proposed and the conditions for co-discharge of cations on it are determined. © Pleiades Publishing, Ltd., 2010. Source


Devyatkin S.V.,Vernadskii Institute of General and Inorganic Chemistry
ECS Transactions | Year: 2014

In this work, the interaction of Si, SiC and TiC with a Na2CO3- K2CO3 melt at 7500° on Ar atmosphere and in air was investigated. The optimal process for the fabrication of carbon fibers or nanotubes is interaction between silicon carbide and carbonate melts. It has been show that the modification of carbon materials depends on SiC powder fineness. Copyright © 2014 by The Electrochemical Society. All rights reserved. Source


Voloshin Y.Z.,RAS Nesmeyanov Institute of Organoelement Compounds | Dolganov A.V.,RAS Nesmeyanov Institute of Organoelement Compounds | Varzatskii O.A.,Vernadskii Institute of General and Inorganic Chemistry | Bubnov Y.N.,RAS Nesmeyanov Institute of Organoelement Compounds
Chemical Communications | Year: 2011

Specially designed hexachlorine-containing cobalt(ii) tris-dioximate clathrochelates were found to efficiently electrocatalyze the production of molecular hydrogen from H+ ions without the overpotential of this process. © 2011 The Royal Society of Chemistry. Source


Belous A.G.,Vernadskii Institute of General and Inorganic Chemistry
International Conference on Oxide Materials for Electronic Engineering - Fabrication, Properties and Applications, OMEE 2014 - Book of Conference Proceedings | Year: 2014

Three types of ferromagnetic nanostructures based on barium hexaferrite (BaFe12O19), lanthanum-strontium manganites with perovskite structure (La1-xSrxMnO3) and materials with spinel structure (AFe2O4, A = Ni, Zn, Co, Mn, Fe) have been synthesized by precipitation from aqueous and nonaqueous solutions, by the sol-gel method and from microemulsions. Magnetic properties of the synthesized nanoparticles and films have been investigated. It was shown that the obtained nanoparticles exhibit superparamagnetic properties. It has been found that the synthesized nanoparticles have promise in hyperthermia of cancer cells. It has been shown that the films based on barium hexaferrite can have promise in the creation of nonlinear resonant microwave elements on the basis of high-Q dielectric resonators and ferromagnetic film. © 2014 IEEE. Source


Sabin J.R.,University of Minnesota | Varzatskii O.A.,Vernadskii Institute of General and Inorganic Chemistry | Voloshin Y.Z.,Russian Academy of Sciences | Starikova Z.A.,Russian Academy of Sciences | And 2 more authors.
Inorganic Chemistry | Year: 2012

An insight into the electronic structure of several hafnium(IV), zirconium(IV), and lutetium(III) phthalocyaninoclathrochelates has been discussed on the basis of experimental UV-vis, MCD, electro- and spectroelectrochemical data as well as density functional theory (DFT) and time-dependent DFT (TDDFT) calculations. On the basis of UV-vis and MCD spectroscopy as well as theoretical predictions, it was concluded that the electronic structure of the phthalocyninoclathrochelates can be described in the first approximation as a superposition of the weakly interacting phthalocyanine and clathrochelate substituents. Spectroelectrochemical data and DFT calculations clearly confirm that the highest occupied molecular orbital (HOMO) in all tested complexes is localized on the phthalocyanine ligand. X-ray crystallography on zirconium(IV) and earlier reported hafnium(IV) phthalocyaninoclathrochelate complexes revealed a slightly distorted phthalocyanine conformation with seven-coordinated metal center positioned ∼1 Å above macrocyclic cavity. The geometry of the encapsulated iron(II) ion in the clathrochelate fragment was found to be between trigonal-prismatic and trigonal-antiprismatic. © 2012 American Chemical Society. Source

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