摘要:
Boron nitride nanotubes are prepared by a process which includes: (a) creating a source of boron vapor; (b) mixing the boron vapor with nitrogen gas so that a mixture of boron vapor and nitrogen gas is present at a nucleation site, which is a surface, the nitrogen gas being provided at a pressure elevated above atmospheric, e.g., from greater than about 2 atmospheres up to about 250 atmospheres; and (c) harvesting boron nitride nanotubes, which are formed at the nucleation site.
摘要:
An object of the invention is to provide a spherical boron nitride fine particle well suited for use as a highly thermoconductive filler or the like, and a production method thereof. The invention provides a spherical boron nitride fine particle having an average particle diameter of 0.01 to 1.0 µm, an orientation index of 1 to 15, a boron nitride purity of 98.0% by mass or greater, and an average circularity of 0.80 or greater. The invention provides a method of producing a spherical boron nitride fine particle by reacting ammonia with an alkoxide borate at an ammonia/alkoxide borate molar ratio of 1 to 10 in an inert gas stream at 750°C or higher within 30 seconds, then applying heat treatment to a reaction product in an atmosphere of ammonia gas or a mixed gas of ammonia gas and an inert gas at 1,000 to 1,600°C for at least 1 hour, and further firing the reaction product in an inert gas atmosphere at 1,800 to 2,200°C for at least 0.5 hour.
摘要:
Methods are provided for growing a thin film of a nanoscale material. Thin films of nanoscale materials are also provided. The films can be grown with microscale patterning. The method can include vacuum filtration of a solution containing the nanostructured material through a porous substrate. The porous substrate can have a pore size that is comparable to the size of the nanoscale material. By patterning the pores on the surface of the substrate, a film can be grown having the pattern on a surface of the thin film, including on the top surface opposite the substrate. The nanoscale material can be graphene, graphene oxide, reduced graphene oxide, molybdenum disulfide, hexagonal boron nitride, tungsten diselenide, molybdenum trioxide, or clays such as montmorillonite or lapnotie. The porous substrate can be a porous organic or inorganic membrane, a silicon stencil membrane, or similar membrane having pore sizes on the order of microns.
摘要:
An inorganic filler included in an epoxy resin composition includes a coating layer formed on a surface thereof, and the surface of the coating layer includes at least two elements selected from the group consisting of C, N and O.
摘要:
In the synthesis of boron nitride nanotubes (BNNTs) via high temperature, high pressure methods, a boron feedstock may be elevated above its melting point in a nitrogen environment at an elevated pressure. Methods and apparatus for supporting the boron feedstock and subsequent boron melt are described that enhance BNNT synthesis. A target holder having a boron nitride interface layer thermally insulates the target holder from the boron melt. Using one or more lasers as a heat source, mirrors may be positioned to reflect and control the distribution of heat in the chamber. The flow of nitrogen gas in the chamber may be heated and controlled through heating elements and flow control baffles to enhance BNNT formation. Cooling systems and baffle elements may provide additional control of the BNNT production process.
摘要:
A value inheritance widget system includes a display device including a user interface, and a value impact engine coupled to the display device. The value impact engine is configured to display at least one widget on a user interface. The widget includes a value. The value comprises an inherited value. The value impact engine is further configured to display information of a scope of inheritance of the value before user interaction with the widget. The information of the scope of inheritance of the value includes a number of inheritance levels of the value and a number of objects impacted by a change to the value. The value impact engine is further configured to receive a user input changing the value of the widget and change the value of the widget and the objects in response to receiving the user input.
摘要:
The present invention provides a method for producing a dispersion of fine ceramic particles, the method comprising: adding fine ceramic particles having a mean particle size of less than 1 µm to a dispersion medium selected from the group consisting of a lower alcohol and water; and dispersing the fine ceramic particles in the dispersion medium using a rotor-stator homogenizer. The present invention enables the production of a highly homogeneous and stable dispersion of a nanosized ceramic powder, which is prone to aggregation and the homogeneous dispersion of which is difficult to form, by conducting a simple, uncomplicated operation.
摘要:
A boron nitride powder including flat-shaped primary particles of BN and an aggregate of the primary particles has a water permeation speed not less than 1 mm 2 /s and oil absorption of 100 ml/100 g to 500 ml/100 g, which is a cosmetic boron nitride powder with high hydrophilicity and high oil absorbency. The use of such a boron nitride powder provides a cosmetic that is significantly improved not only in gloss finish and transparency (bare skin feeling) but also in sustainability.