990results about "Nitrogen and non-metal compounds" patented technology

A multilayered material is provided which includes a substrate and a silicon-containing film formed on the substrate, wherein the silicon-containing film has a nitrogen-rich area including silicon atoms and nitrogen atoms, or silicon atoms, nitrogen atoms, and an oxygen atoms and the nitrogen-rich area is formed by irradiating a polysilazane film formed on the substrate with an energy beam in an atmosphere not substantially including oxygen or water vapor and denaturing at least a part of the polysilazane film. A method of producing the multilayered material is also provided.

A method for preparing carbon nitride quantum dots comprises the following steps of (1) material preparation, (2) drying and tabletting, (3) heating, (4) separation and (5) drying. Sodium chloride crystals are used as a template, the preparing process is simple and low in cost, and the sodium chloride crystals can be easily removed through water dissolution; melamine is used as the raw material, and annular carbon nitride basic structural units exist in melamine molecules, so that the yield of preparing the quantum dots is high, and product size uniformity is good; the prepared quantum dots are high in specific area, good in water solubility and good in dispersity, have strong fluorescent radiation visible under naked eyes, and have wide application prospects in the fields of fluorescence detection, light emitting devices, biomarker and the like.

The invention discloses a mesoporous C3N4 photocatalytic material prepared by using a molten salt method and a preparing method thereof. The method comprises the following steps that water-soluble low-melting-point molten salt is fully mixed with melamine, small molten salt drops are used as a blocked layer under the melting temperature of the molten salt, C3N4 grows in a way of being coated with the small drops, and the molten salt is recycled by water washing after reaction, so as to obtain the C3N4 photocatalytic material. The C3N4 photocatalytic material is in a wormlike mesoporous structure, the mesoporous size is within 3.8+/-1nm, and the forming mechanism of the mesoporous C3N4 photocatalytic material is that the small molten salt drops are used as the growth blocked layer. When the material is prepared, water-soluble low-melting-point chloride salt is used as the molten salt and is fully mixed with melamine to obtain a mixture, the mixture is subjected to the heat treatment in a muffle furnace for 1-5h under the temperature being 400-680 DEG C to obtain samples, and the samples after the heat treatment are washed by water to recycle the molten salt, so as to obtain the mesoporous C3N4 photocatalytic material. In the whole process, a template is not introduced, and the operation is easy and feasible, so that the large-scale industrial production can be realized easily.

The present invention includes carbon synthesis devices and systems. The invention also includes machines and instruments using those aspects of the invention. The present invention also includes methods of carbon synthesis. The present invention includes an array of carbon nanotubes, each nanotube having a longitudinal axis. The nanotubes are placed into an array such that the longitudinal axes of all nanotubes in the array are substantially parallel. The array may be a two-dimensional array or a three-dimensional array. The present invention also includes methods of preparing such carbon molecular clusters and arrays thereof.

The present invention is made to provide a carbon catalyst capable of preventing the coarsening of particles of nanoshell structure of carbon which causes reduction in activity for oxygen reduction reaction. The carbon catalyst is produced by the steps of: preparing a carbon precursor polymer; mixing a transition metal or a compound of the transition metal into the carbon precursor polymer; spinning the mixture of the carbon precursor polymer and the transition metal or the compound of the transition metal into fibers; and carbonizing the fibers.

The invention provides a spherical mesoporous C3N4 material with a hollow cavity nanostructure and a preparation method thereof. The preparation method comprises the following steps: modifying a nano solid SiO2 spherule to get a solid SiO2 material coated with mesoporous SiO2 on the outer layer, further adding alkali, selectively etching off the inner-layer solid SiO2 to get nano hollow mesoporous SiO2, fully impregnating the nano hollow mesoporous SiO2 in a water solution of a nitrogen-containing precursor, performing centrifugal drying, performing high-temperature roasting in protective gas, and then using hydrofluoric acid to dissolve the SiO2 to get the spherical hollow mesoporous nano C3N4. The prepared product has the specific surface area of 300-800m<2>/g and a cavity capable of loading other materials, is easy to perform mass transfer and can be further widely applied.

A block copolymer, preferably a block copolymer such as poly(isoprene-block-ethylene oxide), PI-b-PEO, is used as a structure directing agent for a polymer derived ceramic (PDC) precursor, preferably a silazane, most preferably a silazane commercially known as Ceraset. The PDC precursor is preferably polymerized after mixing with the block copolymer to form a nanostructured composite material. Through further heating steps, the nanostructured composite material can be transformed into a nanostructured non-oxide ceramic material, preferably a high temperature SiCN or SiC material.

The present invention provides a method for efficiently preparing graphene-like carbon nitride. The method is characterized by comprising: using a nitrogen-rich organic matter as a raw material, adding a microwave absorbing agent, mixing, placing into a ceramic crucible, placing the crucible into the center of an industrial high-energy resonant cavity, vacuumizing, and carrying out high-energy microwave irradiation heating so as to rapidly and efficiently prepare the graphene-like carbon nitride. According to the present invention, the obtained graphene-like carbon nitride has characteristics of high specific surface area, high yield and high purity, and can be used in the fields of degradation of organic matters, hydrogen production through photolysis of water, catalyst carriers, biomedical sensors, and the like.

The present invention is directed to a condensed phase batch process for synthesis of trisilylamine (TSA). An improved synthesis method that incorporates a solvent to help promote a condensed-phase reaction between ammonia gas (or liquid) and liquified monochlorosilane (MCS) in good yields is described. This method facilitates the removal of the byproduct waste with little to no reactor down time, substantial reduction of down-stream solids contamination and high-purity product from first-pass distillation.

There is described an apparatus, a tubular laminar flow, plug flow reactor, for making silylamines and particularly trisilylamine (TSA) in high yields from ammonia gas and a monohalosilane gas. The apparatus can be a tubular flow reactor comprising a first portion of the reactor defining a gas entry zone, a second portion of the reactor defining a reaction zone and a third portion of the reactor defining a separation zone, the reaction zone providing a reactant contacting region. Trisilylamine can be recovered in the separation zone in a cold trap collection vessel.

An organoboron route and process for preparation of boron nitride utilizing aerosol assisted vapor phase synthesis (AAVS) wherein organoboron precursors are nitrided in one or two heating steps, and wherein a boron oxide nitride intermediary composition is formed after the first heating step and may be further nitrided to form resultant spheroidal boron nitride powders including spheroidal particles that are smooth, bladed, have protruding whiskers, and are of turbostratic or hexagonal crystalline structure.

The invention discloses a polymer photocatalyst and a method of water-phase photo-catalytic selective alcohol oxidation. According to the invention, an organic polymer carbon nitride catalyst is prepared, and is applied in a water-phase photo-catalytic selective alcohol oxidation system. Compared with common ultraviolet catalyst TiO2, visible light catalyst TiO2-xNx, metal sulfide, metal nitride, metal nitrogen oxides, and the like, when alcohol is oxidized in water phase with a green oxidant air/oxygen under mild conditions, the carbon nitride catalyst is more stable and shows higher efficiency. The preparation method of the carbon nitride catalyst is simple and feasible, and the catalyst comprises no metal element, such that the catalyst is cheap. With the catalyst, alcohol oxidation aldehyde synthesis or ketone synthesis processes are simple and feasible, such that industrialized large-batch productions of aldehyde and ketone compounds can be facilitated.

The invention relates to salt lake resource developing and comprehensive utilization. It uses boron, magnesium and lithium bittern as raw material, adopting combination distilling technology to make boric acid, magnesium hydroxide, lithium carbonate, and ammonium chloride. The recycling ratio of boron, magnesium and lithium reach 87%, 95%, and 92%. It has the advantages of simple technology, little device investment, high utilization coefficient of resource, high yield, good product quality, low producing cost and no pollution.

The invention discloses a preparation method of graphite phase carbonitride. A preparation process comprises the following steps of using nitrogen-rich organic matters are raw materials; graphite or silicon carbide is used as a microwave absorption agent; the nitrogen-rich organic matters and the microwave absorption agent are uniformly mixed; in a microwave radiation electromagnetic field, the pressure is controlled to be 5 to 35 kPa, the microwave radiation power is 2 to 10 kW, the temperature rise speed is controlled to be 50 to 500 DEG C/min, and the heat insulation reaction is performed for 5 to 30 min at 450 to 700 DEG C; the graphite phase carbonitride is obtained. The method is based on a high-energy microwave radiation treatment method; the graphite phase carbonitride in a layered structure can be fast and efficiently obtained; the method is simple and efficient; the cost is low; varies kinds of expansive or environment-harmful reagents such as catalysts, organic solvents and protection gas are not used. The method has the advantages that the environment-friendly effect is achieved; the raw material pretreatment is not needed, and the like. The method belongs to a green preparation method favorable for large-scale business production.

The invention relates to a preparation method for a self-assembly carbonitride nanotube. The preparation method comprises the following steps: adding melamine into glycol to form a saturated solution: slowly adding an aqueous solution of nitric acid with a concentration of 0.12 +/- 0.02 mol/L into the saturated solution until a great amount of white precipitate is generated, centrifugating the white precipitate, rinsing the white precipitate with ethanol and drying the white precipitate at a temperature of 60 +/- 10 DEG C so as to obtain white powder; and calcining the obtained white powder in a muffle furnace at a temperature of 350 +/- 10 DEG C for more than 0.6 h so as to obtain the self-assembly carbonitride nanotube. The preparation method provided in the invention has the advantages of mild preparation conditions, low sintering temperature, a simple process and energy conservation; the nanotube synthesized by using the preparation method has excellent photo-conductive performance, emission wavelength of fluorescence of the nanotube can generate wavelength red shift as sintering time prolongs, and the nanotube can generate fluorescence of a variety of colors after doped by rare earth metal ions.

Crystalline scintillator materials comprising nano-scale particles of metal halides are provided. The nano-scale particles are less than 100 nm in size. Methods are provided for preparing the particles. In these methods, ionic liquids are used in place of water to allow precipitation of the final product. In one method, the metal precursors and halide salts are dissolved in separate ionic liquids to form solutions, which are then combined to form the nano-crystalline end product. In the other methods, micro-emulsions are formed using ionic liquids to control particle size.

A method of producing biodiesel through the trans-esterification of a triglyceride, comprising mixing a triglyceride, an alcohol, and a catalyst to form a mixture, where said catalyst is non-metal quaternary ammonium hydroxide or non-metal quaternary phosphonium hydroxide, removing volatile components from said mixture, and allowing the remaining mixture to separate into a biodiesel-rich layer and a glycerol-rich layer.

The invention relates to the field of inorganic materials, in particular to a high-specific-surface-area mesoporous graphite-phase carbon nitride material and a preparation method thereof. The graphite-phase carbon nitride material which is yellow powder is 5-28nm in pore diameter, 120-220m<2>/g in specific surface area and 0.4-0.7cm<3>/g in pore volume. The preparation method includes: dispersing guanidine hydrochloride solution on nano SiO2 microspheres or mesoporous silicon oxide materials, stirring, drying, calcining in an inert atmosphere, and removing a mould plate to obtain the mesoporous graphite-phase carbon nitride material. The raw material guanidine hydrochloride is low in cost and safe, the preparation method is simple, and the product is high in specific surface area. Further, adjustment of pore volume and specific surface area of the mesoporous graphite-phase carbon nitride material can be realized by adjusting usage of template agent.