Abstract:
The synthesis method of a diamond is characterized by (a) laminating and arranging complex solvent metal plates(6) comprising a medium layer(4) and an outer layer(5) between high purity graphite plates(3), (b) inserting the laminated and arranged sample into the high pressure vessel, and (c) heating the sample at 43˜48kbar and 1290˜1320deg. C to form a diamond particle(D) in the pores(5a) of the outer layer. The solvent metal of the medium layer is Ni or Co, and the solvent metal of the outer layer is Fe, Ni or Ni-Fe alloy.
Abstract:
Diamond is synthesized by stacking graphite plates(1) and solvent metallic plates(2) alternated at high temperature under high pressure. Especially intermediate layer(4) is inserted between the solvent metallic plates to form same numbers of diamond particles(3) on the upper and lower sides of the solvent metallic plate. The intermediate layer is tungsten or molybdenium thin film with 10-100 micron thickness. This method can control the density of diamond particles, and so diamond of good quality can be obtained.
Abstract:
본 발명은 흑연판과 용매금속판을 교대로 적층배열한 후 고압용기중에서 고압, 고온을 가하여 다이아몬도를 합성시키는 방법에서 다이아몬드의 형성밀도 제어가 가능하도록 한 것이다. 본 발명은 용매금속판을 이중금속의 중간층과 양 바깥층으로 이루어진 복합 용매금속판으로 구성하고 양 바깥층의 내부에는 통공을 형성하여 다이아몬드의 형성이 이들 통공부위에서만 일어나도록 한 것이다. 따라서, 본 발명은 일정 합성조건에서 각 용매금속의 두께와 통공의 크기 및 밀도를 조절하는 것에 의해 합성되어지는 다이아몬드 분립체의 크기와 밀도를 인위적으로 제어하는 것이 가능하다는 이점이 있다.
Abstract:
PURPOSE: A titanium dioxide nano-powder for a dye-sensitized solar cell photoelectrode and a manufacturing method thereof are provided to enable dye molecules to be absorbed rapidly and photoelectric conversion to have high efficiency. CONSTITUTION: A titanium dioxide nano-powder for a dye-sensitized solar cell photoelectrode is titania nanopowder for anatase type dye-sensitized solar cell photoelectrode having a dipyramid structure. A specific surface area of the nano-powder is 80m/g or greater. An adhesion rate of paint to the nano-powder is more than 80% or greater within 5 minutes after contact. A manufacturing method of the titania nano-powder for the dye-sensitized solar cell photoelectrode comprises next steps: forming titania nano-powder with a vapor synthesis method by using precursors of titanium alkoxide; post-thermal treating the titania nanopowder; and forming anatase type titania nanopowder having an angular shape.
Abstract:
Aluminum nitride nanopowders prepared by adding melamine and a preparation method of the aluminum nitride nanopowders are provided to synthesize aluminum nitride nanopowders which are more efficient in solving non-economic efficiencies such as high reaction temperatures and long reaction times that are problems of an existing synthetic method. A preparation method of an aluminum nitride nanopowder comprises: a first step of mixing a boehmite(AlOOH) powder, a carbon-containing powder, and a powder containing carbon and nitrogen; a second step of charging the mixed powder into a furnace; a third step of primarily heating the furnace under a hydrogen gas or nitrogen-containing gas atmosphere, thereby decomposing the boehmite powder to form aluminum oxide(Al2O3) that is reducible at low temperatures as an intermediate; and a fourth step of secondly heating the furnace at a temperature higher than that in the first heating process under an ammonia gas or nitrogen gas atmosphere, thereby reacting the intermediate with a carbon component and a nitrogen component to reduce the intermediate and nitride aluminum at the same time. The preparation method further comprises the step of maintaining temperature of the resulting material at a final process temperature for 1 to 5 hours after performing the second heating process of the fourth step. Further, a mixing ratio of the boehmite(AlOOH) powder, the powder containing carbon and nitrogen and the carbon-containing powder is 1.00:0.36:0.20 to 1.00:5.35:3.00.
Abstract:
A counter electrode having carbon compound layer for dye-sensitized photovoltaic cell and a method for manufacturing the same are provided to reduce a manufacturing cost and improve durability by forming the counter electrode using an adhesion layer and the carbon compound layer. A dye-sensitized photovoltaic cell comprises an optical electrode(10), a counter electrode(20) located to be faced to the optical electrode, an electrolyte(30). The counter electrode is formed by stacking the adhesion layer and a carbon compound layer(23) sequentially on a conductive substrate(21) for the counter electrode. The electrolyte is distributed uniformly within a metal oxide nano particle layer(12) as a porous film in a space between the optical electrode and the counter electrode.
Abstract:
A nanopowder combustion reactor of which structure is optimized to prevent oxides from being deposited on an inner wall of a reaction nozzle, secure uniformity of a flame and accurately control temperature of the flame, a nanopowder synthesizing system using the nanopowder combustion reactor, and a method of controlling the nanopowder synthesizing system are provided. A nanopowder combustion reactor(10) comprises: an oxidizing gas supply nozzle(12) to which an oxidizing gas pipe(11) is connected; a gas supply part(15) having a fuel gas pipe(13) and a precursor gas pipe(14); and a reaction nozzle(18) which forms a concentric circle together with the oxidizing gas supply nozzle within the oxidizing gas supply nozzle, is connected to the gas supply part, and has oxidizing gas inflow holes(17) disposed at positions thereof adjacent to an injection port(16) for injecting a flame. The nanopowder combustion reactor comprises a backflow prevention plate(19) which divides the interior of the reaction nozzle, to which the precursor gas pipe is penetratingly connected, and on which a plurality of pores are formed to pass a fuel gas and prevent backflow of a precursor gas.