G. P. Bogatyreva

Application of modified nanodiamonds as catalysts of heterogeneous and electrochemical catalyses

The possible use of modified nanodiamond powders in heterogeneous and electrochemical oxidation catalyses is analyzed. It is shown that the efficiency of oxidation catalysis depends on the content of atomic oxygen. The inference is drawn that the electrochemical modification of the surface of nanodiamond powders in a hydrochloric solution and the promotion of the surface with palladium are promising for the preparation of both catalysts of the oxidation of CO to CO2 and electrodes of low-temperature fuel elements.

Detonation diamonds in Ukraine

Some information on the history of dynamic synthesis of diamond in Ukraine is considered. Basic characteristics of ASM5 0.1/0 and ASM1 0.1/0 nanodiamond powders produced by static synthesis are described. The characteristics and surface properties of nanodiamond powders produced by detonation synthesis in Ukraine are presented. It is shown that the chemical activity of the particle surface can be controlled. Applications of nanopowders produced by detonation synthesis in various technologies are considered.

Magnetic characteristics and anticancer activity of a nanocomplex consisting of detonation nanodiamond and doxorubicin

On the basis of detonation nanodiamond and doxorubicin antitumor drug a nanocomplex with magnetic properties of a soft ferromagnetic has been produced by mechano-magnetochemical synthesis. The combined action of the synthesized nanocomplex and local radio-frequency hyperthermia has been shown to initiate the tendency for an increase of the growth inhibition of Walker-256 carcinosarcoma as compared to the monoeffects of the nanocomplex and officinal doxorubicin.

The effect of the methods of recovering diamond nanopowders on their physicochemical properties

The effect has been considered of the methods of recovering (liquid oxidation of nondiamond carbon with a mixture of sulphuric and chromic acids, selective gas oxidation of nondiamond carbon in the presence of copper salts as a catalyst, and oxidation of nondiamond carbon with a mixture of concentrated sulfuric and nitric acids) diamond nanopowders from detonation-synthesized diamond-carbon products on physicochemical properties of diamond, for which the structural state of the diamond surface is responsible. It has been found that diamond nanopowders recovered using different technologies exhibit a decrease of the volume fraction of aggregates among particles. Nanodiamonds recovered by a catalytic gas-phase oxidation in the presence of copper have been found to be characterized by the highest adsorption activity, thermostability, and electroconductivity due to the carbon-containing cover of a complex composition. The recommendations have been given on the use of diamond nanopowders recovered by different technologies.

On morphometric uniformity of diamond micron powders

The paper presents the findings of characterization of initial diamond powders and products of their flotation separation, analysis of the adequacy of mean values of morphometric characteristics and assessment of powder uniformity by a system-criterion method. The separation is demonstrated to provide a significant improvement of powder uniformity in dimensional characteristics and shape index. The flotation products have been found to feature the best uniformity which explains their higher abrasive ability. The flotation separation method has proved to be a suitable tool for improving morphometric uniformity of diamond micron powders, and the proposed system of computer-aided analytical methods has been demonstrated to offer an efficiency means for quantitative analysis of morhometric characteristics of the powders.

Formation of the energy state and adsorption capacity of the surface of nanodiamond powders during preparation

This paper reports on new results of the investigation into the energy state and adsorption capacity of the surface of nanodiamond powders.

The influence of strength characteristics of diamond grits on drilling tool performance

The paper presents the results of investigation of the effect of strength characteristics (strength, strength uniformity, thermal stability) of diamond grits on wear of impregnated drill bits and expenditure of energy for rock destruction by such tools. The influence of strength characteristics of diamond grits on the drilling tool performance has been verified experimentally. The field tests have demonstrated that the better the strength characteristics of the grits the larger the average meterage drilled per bit and the rate of penetration.

Mo2C as a carrier of Cu-Co-Fe oxide catalysts in oxidation reaction of CO

Physicochemical characteristics of Cu-Co-Fe oxide catalysts applied to molybdenum carbide and their catalytic activity in the CO oxidation reaction have been studied. It has been shown that for a more efficient use of Mo2C as a carrier of catalysts, it should be processed with a mixture of HF + HNO3 acids with the aim to increase the defectiveness of the structure.

Improving wear resistance of drilling tools fitted with synthetic diamond

The paper summarizes the findings of investigation of the influence of physicochemical and physical-mechanical properties of synthetic diamond grits on the drilling tool performance. Wear resistance of drilling tools is demonstrated to increase when they are fitted with synthetic diamond grits that are highly uniform in strength. The use of diamond grits with a better developed surface is found to provide a stronger grit retention in the bond and reduced drilling tool wear.

Magnetic methods of purification control of nanodiamond powders

Magnetic methods of quantitative determination of impurities in nanodiamond powders (NDPs) are discussed. For two types of NDPs, it is shown that the magnetic susceptibility depends on their treatment.