Abstract:
Изобретение относится к технологии получения аллотропных модификаций углерода и может быть использовано, в частности, для синтеза кристаллов алмазов, получения лонсдейлита, фуллеренов, стеклоуглерода и т.п. В способе получения аллотропных модификаций углерода, включающем электрическое воздействие на углерод в жидкой среде, в качестве электрического воздействия используют электрогидравлическую обработку полидисперсной системы, состоящей из жидкой дисперсионной среды и твердой дисперсной фазы. В качестве полидисперсной системы может быть использована ультрамикрогетерогенная система с размерами частиц дисперсной фазы 10 -7 - 10 -9 м. При этом в качестве дисперсионной среды может быть использована жидкость с водородным показателем (рН) в диапазоне от 6 до 9, в зависимости от конкретной величины которого определяется оптимальная величина мощности электрогидравлического удара. Отношение дисперсионной среды к твердой дисперсной фазе может составлять 50:50. Кроме того, электрогидравлическая обработка полидисперсной системы может осуществляться в присутствии катализатора, такого как железо, или никель, или родий, или палладий, или платина.
Abstract:
The present invention concerns nanometric-sized ceramic materials in the form of multiple crystalline structures, composites, or solid solutions, the process for their synthesis, and uses thereof. These materials are mainly obtained by detonation of two water-in-oil (W/O) emulsions, one of which is prepared with precursors in order to present a detonation regime with temperature lower than 2000°C, and they present a high chemical and crystalline phase homogeneity, individually for each particle, as well as a set of complementary properties adjustable according to the final applications, such as a homogeneous distribution of the primary particles, very high chemical purity level, crystallite size below 50 nm, surface areas by mass unit between 25 and 500 m2/g, and true particle densities higher than 98% of the theoretical density. This set of characteristics makes this materials particularly suitable for a vast range of applications in the nanotechnology field, such as, for example, nanocoatings, magnetic nanofluids, nanocatalysts, nanosensors, nanopigments, nanoadditives, ultra light nanocomposites, drug release nanoparticles, nanomarkers, nanometric films, etc.
Abstract:
The explosive consolidation of semiconductor powders results in thermoelectric materials having reduced thermal conductivity without a concurrent reduction in electrical conductivity and thereby allows the construction of thermoelectric generators having improved conversion efficiencies of heat energy to electrical energy.
Abstract:
Apparatus for the treatment of material comprises a confined volume for receiving the material, and a source of gas at elevated pressure communicable with the interior of the volume. A suitable source of gas is an airgun, or other apparatus capable of releasing a volume of gas at elevated pressure such as at least 1000psi. It is preferred that the source of gas is located within the confined volume. It is also preferred that the confined volume is a pressure vessel. Inlet an outlet valves will assist in loading and unloading material for treatment. Gate valves will further assist by closing when the volume is full. The invention is thus particularly useful in the destruction of chemical and biological agents, for the purification of contaminated water, and for the destruction of tropical and other larvae previously leading to diseases such as Nile Disease, malaria and the like.
Abstract:
A process is provided for conversion of a feedstock, in particular a hydrocarbon feedstock such as methane or natural gas, in which a reactive mixture containing the feedstock is prepared and fed to a reaction zone. A reaction is initiated in the reactive mixture within the reaction zone so as to generate a conversion wave of increased temperature and pressure. The conversion wave is allowed to pass through the reaction zone, from where converted feedstock is recovered. An apparatus for carrying out the process is also provided. The process operates with a high conversion and selectivity to desirable products and is particularly suitable for the conversion of methane to carbon monoxide and hydrogen.
Abstract:
A pulse detonation engine is provided with several detonation combustors (10) selectively coupled to an air inlet (20) and fuel source (31) by a rotary valve (50). The rotary valve (50) isolates the steady operation of the air inlet (20) and fuel system (30) from the unsteady nature of the detonation process, and allows the fueling of some of the detonation chambers (10) while detonation occurs in the other detonation chambers (10). The fuel system (30) can use a solid fueled gas generator.
Abstract:
A diamond-containing material having the following element content ratio in per cent by weight: carbon 75-90, hydrogen 0.6-1.5, nitrogen 1.0-4.5, oxygen the balance, the following phase content ratio in per cent by weight: roentgen amorphous diamond-like phase 10-30, diamond of cubic modification the balance, and having a porous structure. 10-20 % of the surface of the material consists of methyl, nitryl and hydroxyl groups of two types, as well as functional oxycarbonic groups of the general formula O=R where R represents =COH, =COOH, =CO, =C6H4O or any of their combinations, and 1-2 % of the surface consists of carbon atoms with non-compensated links. A method for obtaining said material consists in detonation of a carbon-containing explosive substance with negative oxygen balance, or a mixture of explosive substances, in a closed volume in the atmosphere of gases inert to carbon, with an oxygen content of 0.1-6.0 % by volume, at a temperature of 303-363K and in the presence of ultradispersed carbon phase with concentration of 0.01-0.15 kg/m.
Abstract:
The invention relates to production of super hard materials. A carbon composition comprises 18-38 % by weight of diamond with the size of particles of 40-120 ANGSTROM and up to 100 % by weight of graphite with the size of particles of 200-1000 ANGSTROM . The method consists in detonation of a carbon-containing explosive substance with a negative oxygen balance in a cooling medium containing 40-60 % by volume of carbon dioxide, no more than 2 % by volume of free oxygen and up to 100 % by volume of a neutral gas. The carbon composition can mainly be used as an abrasive material for superfinishing.
Abstract:
A laser initiated process generates a shock wave of sufficient strength to produce a sintered product. The sintered product is prepared from at least a fuel and an oxidizer that will sustain an explosion in a reaction vessel. The explosion is initiated by introducing a laser beam into the reaction vessel and a shock wave begins to propagate at the point where the explosion is initiated. A sintered product is prepared when the shock wave is sufficiently strong to densify the product. Although the reaction will proceed using a two-component fuel-oxidizer mixture, the reaction is especially useful for producing sintered doped or undoped silicon dioxide (SiO2) from a reaction mixture containing at least silicon tetrachloride, hydrogen and oxygen. The sintered SiO2 can be deposited on a deposition surface situated in the reaction vessel to produce a preform that can be processed to produce an optical fiber.
Abstract:
A slant axis rotary piston mechanism including a shaft (42) having an angularly offset eccentric (44) and a housing (10) defining a general spherical chamber (22) journalling the shaft and containing the eccentric. A peripheral, generally sinuous partition (20) is fixed in the housing and extends radially into the chamber towards the eccentric. A rotor (62) is journalled on the eccentric and is of generally spherical exterior configuration (64) and has a peripheral groove (66, 68, 70) extending about and opening to its periphery. Each of the sides (66 and 68) of the groove face a corresponding side (24, 26) of the partition and define therewith at least two working volumes of variable volume. Gears (108, 110) synchronize relative movement between the shaft, the rotor and the housing, and ports (90, 92, 94, 96) provide for ingress and egress of working fluid to the working volumes.