Materials Literature
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We investigated both theoretically and experimentally the diffraction property of cholesteric liquid crystals (CLCs) in the configuration of transmission grating. The CLCs are treated as birefringent index gratings whose diffraction property is strongly dependent on the polarization state of the incident beam. In our…
The differences between AC and DC aging are pointed out and are partly due to the different dissipated energy under the two types of field and partly due to the fatigue induced by the alternating stress. In addition to these effects, the sample size has also a considerable impact on both aging and breakdown. It is sho…
Technology for obtaining thin, multiwalled carbon nanotubes developed at the Mendeleev University of Chemical Technology, as well as the morphology and certain properties of these tubes are characterized. Methods for activating, functionalizing, and solubilizing these nanotubes are enumerated. Promising directions of…
The effect of molecular mass on the formation of a bilayer structure upon the layer-to-layer adsorption of a cationic polyelectrolyte (poly(dimethyldiallylammonium chloride), molecular mass M = 500000 and 100000-200000 Da) and an anionic polyelectrolyte sodium (poly(acrylate), M = 30000 and 2100 Da) on the surface of…
With the wide use of extra high voltage gas insulated substation (GIS), very fast transient over-voltage (VFTO) generated by switching operations threatens the insulation of some equipments even the security of power system. For a 500 kV GIS, the model has been built up and the parameters have been selected in this pa…
In case of a pressurized water reactor’s severe accident with core meltdown and vessel failure, corium would spread on the concrete basemat of the plant. The high temperature of the corium pool maintained by the residual power would lead to the erosion of the concrete walls and potentially to the bypass of the contain…
Scanning electron microscopy, X-ray diffraction and adsorption structural analyses, and helium pycnometry were used to study the structure of nanoporous carbon produced by chlorination of powdered titanium carbide and carbonitride and of titanium carbide synthesized by chemical-vapor deposition. The results obtained w…
Abstract : We have studied ignition characteristics of SWCNTs with an ordinary camera flash. Our ultimate goal is to use SWCNTs as a means for ignition of liquid rocket fuel sprays. Based on the initial results, we believe this approach enables volumetric and distributed ignition of fuel sprays. Our preliminary invest…
ZnO nanocrystals were prepared from the decomposition of zinc(II) 2-ethylhexanoate. Soluble nanocrystals with a size ranging from about 5 to 8 nm were obtained. The powders obtained were tested as optical gas sensor based on photoluminescence (PL) variation with NO2, ethanol and relative humidity at room temperature (…
Fine particles of nickel ferrite are synthesized by the sol-gel technique and characterized by the X-ray diffraction method. These materials are incorporated in ethylene propylene diene rubber (EPDM) according to a specific recipe for various loadings. The rubber ferrite composites (RFCs) thus obtained have several ap…
The possibility of intensifying the oxidation of aluminum metal with water by ultrasonic treatment at room temperature was demonstrated for the first time. The influence of ultrasound on the main process stages was analyzed. Changes in the structure of the products were evidence of possible metal dispersion during oxi…
We have developed a new heating test to investigate the influence of dissolved copper and oxygen on the copper sulfide generation in alkyl benzene insulating oil with dibenzyl disulfide (DBDS) added. The weight of the deposited and dissolved copper was systematically studied in atmospheres of nitrogen and artificial a…
The determination of trapping parameters such as order of kinetics, activation energy and frequency factor is one of the most important studies in the field of thermally stimulated luminescence (TSL). A polycrystalline sample of Mn-doped Li2B4O7 was prepared by melting method. The formation of the doped compound was c…
Novel amphiphilic block molecules consisting of a rigid 2‐phenylthiophene or 5‐phenylbithienyl core, with a polar glycerol group attached to the phenyl ring and one or two alkyl chains attached to the thiophene ring on the other side, have been synthesised by using Ni(0) and Pd(0) catalyzed coupling reactions as key s…
Abstract The behavior of a recent kinetics mechanism for the reduction reaction of NO by CO on the surface of a series of percolation clusters is studied by means of Monte Carlo simulations using experimental rate constant values from the literature. The structural sensitivity of the reaction is observed through the p…
The polyester based thermoplastic polyurethane elastomers (TPUs) were prepared by one-step solution polymerisation to obtain a product with completely linear molecular structure and with excellent solubility. The synthesis technique was determined by investigation of the influence of solvent and catalyst on the viscos…
Theory of vacuum polarization by singular background fields is applied to the study of electronic properties of the graphitic monolayer (graphene) with a topological defect. Graphene in the long-wavelength approximation is characterized by the linear dispersion law for the quasiparticle excitations, representing a uni…
The presence of water in insulating solids is known to affect the dielectric properties. Although relaxation processes evolved with the excitation frequency and temperature, further characteristics unfold when contaminant with a high dielectric constant, such as water is involved. When the material consists of a micro…
Transmission electron microscopy, X-ray diffraction, and electron back-scattering pattern analysis have been used to investigate the effect of the speed of equal-channel angular pressing (ECAP) at room temperature on the formation of ultrafine-grained structure in pure aluminum. It has been established that eight ECAP…
In this work, an inexpensive and simple technique for the synthesis of carbon nanotubes (CNTs) by using graphite as the target for IR laser radiation is presented. This graphite material is obtained from the recycled graphite electrode core of an electric arc furnace. The experiment was carried out in a reaction chamb…