Currently available methods of industrial nanodiamond synthesis

The main theoretical aspects of detonation decomposition of powerful mixed explosives with a negative oxygen balance accompanied by the formation of nanodiamonds (ultrafine-dispersed diamonds, UDDs) are described. The basic UDD synthesis parameters are considered, and the expediency of using trotyl-hexogen alloys is shown. The conditions of diamond phase conservation in the detonation products are specified. Various versions of industrial detonation synthesis of UDDs are considered. The most efficient technology of chemical cleaning of UDDs (with nitric acid at high temperatures and pressures) for producing UDDs with the highest purity is described.

     

Synthesis and Cytotoxic Activity of 4-Substituted 3-Cyano-6,6-dimethyl-5,6-dihydro-2-pyranones

The respective 4-(arylvinyl)lactones and compounds of the Michael adduct type were synthesized by the condensation of substituted benzaldehydes with 3-cyano-4,6,6-trimethyl-5,6-dihydro-2-pyranone in the presence of catalytic amounts of sodium hydroxide. It was shown by the semiempirical AM1 method that the indicated products can be formed through one and the same intermediate compound. Some of the synthesized phenylvinyl-5,6-dihydro-2-pyranones have a cytotoxic effect, and this corresponds to the prognosis of the OREX expert system.     

Effect of Industrial Detonation Nanodiamonds on the Ratio of Mononitrotoluene Isomers in Nitration of Toluene with a Sulfuric-Nitric Acid Mixture

A qualitative and quantitative influence exerted by addition of detonation nanodiamonds on the formation selectivity of mononitrotoluene isomers in the heterophase nitration of toluene with a sulfuric-nitric acid mixture having low nitration activity was found. It is shown that the isomer ratio of the ortho-/paramononitrotoluenes can be varied within the range 1.00–2.7 at a temperature of 50°C by changing the stirring intensity within the range 300–5000 rpm. It was found that the strongest influence on the ortho-/para-ratio of the mononitrotoluene isomers is exerted by nanodiamonds having surface chemically modified via oxidation with a mixture of concentrated nitric and sulfuric acids.     

Industrial Synthesis of Ultradisperse Detonation Diamonds and Some Fields of Their Use

The cluster nature of detonation-synthesized ultradisperse diamonds (UDD) is considered. The industrial cycle employed for obtaining ultradisperse diamonds is described, with different variations of this process and the basic principles of design of the necessary equipment noted. Priority product areas and advantages of use of ultradisperse diamonds in metal-diamond electrochemical coatings and polymer-diamond composites are discussed in detail.     

Quasi one-dimensional electroconducting compounds from dibenzote trathiafulvalene and metal halides

Conclusions The coordination compounds of some metal halides with dibenzotetrathiafulvalene were obtained, which have high conductivity values.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 940–942, April, 1978.     

Studying the Viscoelastic Properties of an Epoxy Resin Strengthened with Silicon Dioxide Nanoparticles by Instrumented Microindentation

Mechanics of Composite Materials - The viscoelastic properties of surface layers of a Primer-204 epoxy resin modified by silicon dioxide nanoparticles with weight fractions of 0.24, 0.41, 0.65, and...     

On partial derivatives of multivariate Bernstein polynomials

It is shown that Bernstein polynomials for a multivariate function converge to this function along with partial derivatives provided that the latter derivatives exist and are continuous. This result may be useful in some issues of stochastic calculus.