125 results about "Glassy carbon" patented technology

The invention relates to an integrated carbon / carbon composite material crucible containing an yttrium oxide coating, and belongs to the technical field of thermal field parts for monocrystalline silicon. The crucible comprises a carbon / carbon composite material crucible body, a glassy carbon coating and an yttrium oxide coating, the glassy carbon coating can effectively relieve thermal mismatch between the yttrium oxide coating and the carbon / carbon composite material crucible body, and carbon in the carbon / carbon composite material crucible body can be effectively prevented from escaping; impurities are not introduced into the yttrium oxide coating in the silicon melting process, so that the purity of a silicon material can be effectively ensured, and the yttrium oxide coating has excellent silicon erosion resistance and high-temperature stability; the carbon / carbon composite material crucible body is formed by densifying a carbon fiber prefabricated body which is formed by needling and laying a pure net tire for spraying resin, and the inner surface of the carbon / carbon composite material crucible body is a net tire which is wholly approximately isotropic, so that the overall mechanical strength of the crucible can be ensured, and a good combination effect with a subsequent functional coating can be ensured; and the service life of the crucible can be prolonged.

The invention discloses an all-solid-state calibration-free ion concentration detection method. The method comprises the following steps: constructing a plurality of traditional three-electrode detection systems; in each traditional three-electrode detection system, current and impedance signals are synchronously acquired through a step potential electrochemical spectrum and an electrochemical impedance spectrum, and interface kinetic parameters are analyzed; on the basis of a traditional three-electrode detection system, an original reference electrode is removed, a counter electrode is reserved, all glassy carbon electrodes with gradient membrane volumes are connected in series one by one to obtain a new three-electrode detection system, the new three-electrode detection system is immersed in a to-be-detected solution, a preset potential is applied, and through transient current response in combination with calibrated kinetic parameters, the gradient membrane volumes of the glassy carbon electrodes are detected. And performing inversion to obtain the ion concentration of the to-be-detected solution. According to the method, automatic calibration is realized by analyzing interface process kinetic parameters of different-volume film ion selective electrodes and calculating the slope to generate a built-in standard curve. According to the method, interface process parameters are obtained through transient current, and dependence of a traditional detection system on the stable potential of a reference electrode is eliminated.

The invention provides a preparation method of a plate-shaped glassy carbon electrode, which comprises the following steps: curing a resin raw material into a plate-shaped resin block, carbonizing in an inert atmosphere, and respectively introducing a nitrogen source and a boron source for doping operation to obtain a co-doped plate-shaped resin block precursor; placing the co-doped plate-shaped resin block between two porous graphite plates, and carrying out high-temperature treatment to obtain a glassy carbon matrix; and immersing the glassy carbon substrate into the adhesion layer solution to form an adhesion layer, transferring the adhesion layer into a deposition solution which comprises a bismuth-containing solution and a gold-containing solution, forming bismuth-gold nano-dots on the adhesion layer, and washing and drying the bismuth-gold nano-dots to obtain the plate-shaped glassy carbon electrode. Through directional arrangement of crystal orientations, the tantalum carbide coating achieves higher electrical conductivity and thermal conductivity. And the sensitivity and the service life of the plate-shaped glassy carbon electrode are obviously improved and prolonged.

The invention belongs to the technical field of material preparation, and particularly relates to a bone induction material and a preparation method thereof. The invention firstly provides the bone induction material, wherein the bone induction material is prepared from a glassy carbon material subjected to surface modification; the glassy carbon material subjected to surface modification has a coral-like or coral-like morphology, and the coral-like or coral-like morphology comprises a straight line, an arc line, a branched structure, a circular ring or circular ring-like structure and / or a bead-like morphology formed by self-assembly of nanoparticles; the coral-like or coral-like morphology also comprises a non-uniform hole structure. The invention innovatively provides that the carbon material can have a bone induction effect, and proves that the bone induction material prepared by taking the glassy carbon material as the matrix has the capability of accelerating bone tissue repair and regeneration.

The invention relates to the technical field of mine filling materials, in particular to a composite filling cementing material and a preparation method thereof, and the composite filling cementing material comprises the following components: oil shale slag, ironmaking slag, clay mineral slag, Portland cement, a composite activator and a polycarboxylate superplasticizer. The composite activator comprises the following components: water glass, sodium carbonate, metakaolin, anhydrous sodium sulfate, calcium sulphoaluminate, dolomite, silica fume, potassium feldspar and an excitation accelerator. The gelling part is completely composed of various industrial wastes, the materials are convenient to obtain, the manufacturing cost is low, the composite exciting agent can effectively excite the potential activity of the oil shale residues, the ironmaking slag and the clay mineral residues and promote the hydration reaction of the oil shale residues, the ironmaking slag and the clay mineral residues, and the prepared composite filling gelling material has good moisture resistance and good durability.

The invention relates to an integrated carbon / carbon composite material crucible containing a pyrolytic carbon transition coating, and belongs to the technical field of thermal field parts for monocrystalline silicon. The crucible comprises a carbon / carbon composite material crucible body, a glassy carbon coating, a pyrolytic carbon transition coating and an yttrium oxide coating, wherein the glassy carbon coating not only has a good combination effect with the carbon / carbon composite material crucible body, but also can prevent carbon from escaping; the thermal expansion coefficient of the pyrolytic carbon transition coating is close to that of the glassy carbon coating, and the combination effect of the pyrolytic carbon transition coating and the yttrium oxide coating is good; the yttrium oxide coating has excellent thermal stability and excellent silicon erosion resistance, and can ensure the purity of molten silicon in the single crystal drawing process; the carbon / carbon composite material crucible body is formed by densifying a carbon fiber prefabricated body which is formed by needling and laying a pure net tire sprayed with resin, and the inner surface of the carbon / carbon composite material crucible body is a net tire which is wholly approximately isotropic, so that the overall mechanical strength of the crucible can be ensured, and a good combination effect of the crucible and a subsequent functional coating can also be ensured.

The invention discloses a graphite block glassy carbon coating preparation method and a composite material. The graphite block glassy carbon coating preparation method comprises the following steps: roughening the surface of a graphite block; adding fumed silica and an isocyanate compound into the phenolic resin solution to obtain a modified resin solution; respectively preparing a first coating material, a second coating material and a third coating material based on the modified resin solution, the graphite powder and the carbon nanotubes; sequentially coating the three coating materials on the surface of a graphite block, and carrying out cross-linking curing to obtain a multi-layer coating structure; performing segmented pyrolysis on the multi-layer coating structure in an argon atmosphere to obtain a glassy carbon coating; and carrying out surface sanding on the glassy carbon coating, dipping the glassy carbon coating in a phenolic resin solution, and then carrying out heat treatment to obtain the surface-modified glassy carbon coating. By means of the multi-layer coating structure design and the segmented pyrolysis technology, the technical problems that in the traditional glassy carbon coating preparation process, the coating quality stability is poor, and the oxidation resistance is insufficient are solved, and the prepared glassy carbon coating has the advantages of being high in bonding strength, excellent in oxidation resistance and the like.

The invention belongs to the technical field of amino acid detection, and relates to an electrode for identifying and detecting cysteine and application, the electrode is a glassy carbon electrode modified by vitamin B12 and subjected to electrochemical activation treatment; the electrochemical activation treatment comprises oxidation treatment and reduction treatment; the vitamin B12 modification method is an impregnation method and / or the electrolyte in the reduction treatment process contains vitamin B12, and modification is carried out in the electrochemical activation process. According to the invention, direct electric polarization of the molecular catalyst is realized, Cys can be effectively distinguished from sulfydryl of other similar structures, and interference of common electroactive compounds coexisting in a biological sample is eliminated; the super-hydrophilic surface endows the sensor with excellent biological pollution resistance; a new example is provided for electrochemical sulfydryl analysis, an important theoretical basis is provided for bionic interface engineering, and the method is expected to be applied to clinical diagnosis and on-site rapid detection; and a thought is provided for modification of other types of molecular catalysts such as Co-N4.

The invention relates to an environment-friendly water-based composite flame retardant and a preparation method thereof, and belongs to the technical field of flame retardant preparation. A formula of the environment-friendly water-based composite flame retardant comprises the following components in percentage by weight: 1.5-3.0% of modified graphene, 8-12% of nano magnesium hydroxide, 5-8% of nano sodium silicate, 0.5-1.0% of a surfactant and the balance of deionized water. Modified graphene, nano magnesium hydroxide and sodium silicate generate a synergistic flame-retardant effect, the modified graphene builds a compact carbon layer framework, magnesium hydroxide reflects heat radiation through endothermic decomposition and magnesium oxide barrier, sodium silicate promotes formation of a silicate glassy carbon layer, and the oxygen index of the material is remarkably increased through compounding of the three. The flame retardant prepared by the invention has excellent thermal conductivity and environment-friendly characteristic, and can be widely applied to the fields of fire extinguishing and flame retardance.

The invention belongs to the technical field of material preparation, and particularly relates to a superstructure glassy carbon material and application thereof. The invention firstly provides a porous scaffold structure. The porous scaffold structure has a stable structure in which stress in all directions is uniformly distributed; the porous scaffold structure takes a unit cell of a three-period minimum curved surface as a minimum repetitive unit; the unit cell of the three-period minimal curved surface comprises a diamond or diamond-like structure; the porous scaffold structure is made of a high-molecular polymer. Further, the superstructure glass carbon material can be obtained by pyrolyzing the porous scaffold structure. By designing a porous structure with uniform stress and stable mechanics, the high-strength glassy carbon material with accurate and controllable shape and size is developed, and the high-strength glassy carbon material has good application prospects in multiple fields.

This invention discloses a hydrogel fire extinguishing material for mines and its preparation method, specifically relating to the field of fire extinguishing materials technology. The material comprises solid water glass, sodium bicarbonate, polyvinyl alcohol, silicon carbide, and water. The fire extinguishing gel material of this invention possesses the characteristics of simple preparation process, low raw material requirements, low cost, controllable gelation time, good water retention, environmental friendliness, excellent high-temperature stability, and excellent thermal conductivity. Even after complete water loss, it can still form a crack-free solid film on the coal surface to isolate the coal-oxygen reaction, effectively solving the problems of traditional inorganic fire extinguishing gels being prone to water loss and cracking, and releasing toxic gases during use. By changing the material ratio, gelation can be controlled over a wide time range, meeting different needs for on-site filling, long-distance transportation, and storage in coal mines.

In an embodiment an X-ray apparatus includes at least one of an X-ray source configured for generating X-rays or an X-ray detector configured for detecting X-rays, a housing in which the at least one of the X-ray source or the X-ray detector is located, the housing having an opening and a window covering the opening, wherein the window is configured to be passed by the X-rays, wherein the window comprises a transmission layer, and wherein the transmission layer is a carbon layer of glassy carbon.

The invention belongs to the field of polyurethane materials, and particularly discloses a flame-retardant polyurethane material as well as a preparation method and application thereof. The flame-retardant polyurethane material comprises the phosphorus flame retardant, the melamine polyphosphate and the barium metaborate, the phosphorus flame retardant, the melamine polyphosphate and the barium metaborate have a synergistic effect, a continuous, compact and glassy-state-like carbon barrier layer is formed at the burning position of the material, halogen-free flame retardance of the polyurethane material can be achieved, and molten drops can be effectively prevented. Besides, the polyurethane material disclosed by the invention is proper in component and dosage, so that the material formability is good, bubbles and flame retardant precipitation after the material is formed can be avoided, and the utilization rate of the flame retardant is increased.

The utility model provides a high-melting-point graphite pipe for elemental analysis, which belongs to the technical field of spectral analysis and comprises a circular hollow graphite pipe main body and transverse support parts symmetrically arranged on two sides of the graphite pipe main body, an inner pyrolytic carbon layer is deposited on the inner wall of the graphite pipe, a porous structure is arranged in the inner pyrolytic carbon layer, and an outer compact pyrolytic carbon layer is further deposited on the surface of the inner pyrolytic carbon layer. Through the inner pyrolytic carbon layer and the outer compact pyrolytic carbon layer, in the high-temperature working process, the inner wall pyrolytic carbon layer can be selectively consumed to form a compact glassy carbon film, a self-adaptive protection mechanism enables the graphite tube to still keep stable analysis performance under extreme conditions, reaction or permeation of a detected element and graphite at high temperature is reduced, and the analysis accuracy of the graphite tube is improved. The phenomenon of cross contamination is reduced, the memory effect of the graphite pipe is reduced by 70%, but the memory effect of a traditional pyrolytic graphite pipe can only be reduced by 30-40%, and the graphite pipe is particularly suitable for analysis of high-melting-point elements.

A header rail 10 for transporting gas cylinders (30, fig 3) on lorries has an elongate non-metal (e.g. composite such as glass / carbon fibre) central core 12, with metal collars 14 spaced apart along t

The present invention relates to a high-temperature resistant plugging and heat-insulating material, and a preparation method and application thereof. The high-temperature resistant plugging and heat-insulating material comprises: a porous composite material body; a carbon aerogel layer with a glass carbonized surface, which is arranged on the surface of the porous composite material body; the carbon aerogel layer with a glass carbonized surface, one side of which is a carbon aerogel layer, and the other side of which is a glass carbonized layer; the carbon aerogel layer is arranged in the direction of the porous composite material body; a low-density heat-insulating material layer is arranged on the surface of the glass carbonized layer. The technical problem solved by the present invention is how to reduce the gas permeability of the high-temperature resistant porous composite material, so as to avoid or slow down the large pores and high porosity of the high-temperature resistant porous composite material, which may cause gas leakage in ultra-high temperature equipment and high-speed aircraft and affect the operation of its external system, thereby making it more suitable for practical use.

A method of electrochemical sensing includes providing an electrochemical sensor comprising a glassy carbon substrate and gold nanoparticles located on a surface of the glassy carbon substrate; and sensing electrochemically a compound selected from the group consisting of polyfluoroalkyl compounds or perfluoroalkyl compounds using the electrochemical sensor. PFOA quantification was performed by Square Wave Adsorptive Cathodic Stripping Voltammetry (SW-AdCSV) in test solutions with a 100-5,000 ppt concentration. The concentration has a linear relationship with the stripping current within this range. Analysis of tap and groundwater samples performed by additions method demonstrated precision and accuracy above 95%. These electrodes show stability throughout 200 cycles, and reproducibility across similarly prepared but different electrodes above 97.5%. Providing the electrochemical sensor can include providing at least one member selected from the group consisting of perfluoro-1-octanethiol (PFTO), 2,2,2-trifluoroethanethiol (TFET) or perfluorodecanethiol (PFDT) on the surface of the glassy carbon substrate.

The invention relates to a differential calorimeter for detecting a thermodynamic characteristic variable of a sample, wherein at least one heating element (2) and at least one thermal element (3) as temperature sensor are formed in each case in the form of a coating on the surface of a planar substrate (1) which is formed from a glass, glass ceramic, glass carbon or ceramic material having a thermal conductivity of less than 20 W / (m K).

The present invention provides an antifouling lead ion selective electrode prepared using dendritic polypeptides, which belongs to the technical field of marine pollution detection. The present invention first electrodeposit polyaniline (PANI) nanowires on a glassy carbon substrate to form a GC / PANI substrate, then prepare MXene nanosheets and composite them with PANI to form GC / PANI-MXene, and then drop lead ion carrier Pb onto the GC / PANI-MXene. 2+ ‑ISM, and finally the electrode surface was modified with dendrimer peptides to obtain GC / PANI‑MXene / Pb 2+ -ISM / pep electrode. The electrode prepared by the present invention can inhibit the adhesion of nonspecific microorganisms and has excellent stability.

The application provides a glass carbon mold and a recrystallized silicon carbide product and a preparation method, and belongs to the technical field of ceramic material preparation. Microcrystalline cellulose is mixed with water, and the obtained mixture is formed to obtain a cellulose body; the cellulose body is subjected to a stabilization treatment in an oxygen-containing atmosphere to obtain a stabilized body; and the stabilized body is subjected to a carbonization treatment in a protective atmosphere to obtain the glass carbon mold. The glass carbon mold is used to prepare the recrystallized silicon carbide product, which is convenient for directly forming a complex green body and can be sintered together with the product, solves the problem that the green body is easily damaged and deformed in the transfer process, and is environmentally friendly.

A meta-material is disclosed that includes a first layer composed of graphene, and one or more additional layers, each composed of glassy carbon or graphene. A method of producing an engineered material includes depositing a graphene precursor on a substrate, pyrolyzing the graphene precursor to allow the formation of graphene, depositing a glassy carbon precursor the graphene, pyrolyzing to allow the formation of glassy carbon from the glassy carbon precursor, depositing a graphene precursor on the glassy carbon, and pyrolyzing the graphene precursor to allow the formation of graphene.

A superstructural glassy carbon, a preparation method therefor and a use thereof. Firstly, provided is a superstructural glassy carbon having a stable structure with uniformly distributed anisotropic stress. Secondly, also provided are a preparation method and a use of the superstructural glassy carbon, and a bone repair material obtained on the basis of the superstructural glassy carbon.

The invention relates to an integrated carbon / carbon composite material crucible prepared based on a multilayer structure prefabricated body, and belongs to the technical field of thermal field parts for monocrystalline silicon. The crucible comprises a carbon / carbon composite material crucible body, a glassy carbon coating and an yttrium oxide coating, the glassy carbon coating can effectively relieve thermal mismatch between the yttrium oxide coating and the carbon / carbon composite material crucible body, and carbon in the carbon / carbon composite material crucible body can be effectively prevented from escaping; impurities are not introduced into the yttrium oxide coating in the silicon melting process, so that the purity of a silicon material can be effectively ensured, and the yttrium oxide coating has excellent silicon erosion resistance and thermal stability; the carbon / carbon composite material crucible body is formed by compacting a multi-layer structure prefabricated body, the multi-layer structure prefabricated body adopts an isotropic net tire as an inner layer, the good combination effect with a subsequent functional coating can be ensured, a carbon cloth / net tire lamination needling laying layer is combined with a carbon fiber winding layer as an outer layer, and the overall mechanical property of the crucible can be ensured.

The electrochemical method is used for determining the quantity of organic peroxide compounds in food or cosmetic samples in two concentration ranges: a narrow range from 0.5 to 10 μM, applicable to non-peroxidized lipids, and a wide range from 10 to 400 μM, for moderately to highly peroxidized material. The determination is performed in a non-aqueous medium, directly, without complex pre-treatment of the sample, at low energy consumption and at room temperature. The method includes the following stages: obtaining a Co-g-C3N4 / Nation composite electrocatalyst; obtaining a catalytic peroxide electrode consisting of a glassy carbon electrode coated with the Co-g-C3N4 / Nafion composite electrocatalyst; forming an electrochemical peroxide sensor-an electrochemical cell in which the catalytic peroxide electrode is the working electrode, and the electrolyte is acetonitrile with dissolved quaternary ammonium salt; periodically adding equal volumes of the analyte standard solution to the electrolyte in the electrochemical cell; electrochemical measurements; preparing a calibration graph constructed by plotting the electrochemical response versus analyte concentration; determining the concentration of peroxides in the sample using the method of standard addition.

To provide a catalyst for hydrogen generation that can be manufactured at low cost and enables efficient hydrogen generation, and a method for producing the catalyst for hydrogen generation.SOLUTION: A catalyst for hydrogen generation comprises a mixture of tungsten carbide and cobalt, characterized in that the absolute value of a cathode current per mg of the catalyst is 0.10 mA / mg or more when the catalyst for hydrogen generation is loaded on a glassy carbon electrode and subjected to potential scanning at -1.2 V with respect to a silver / silver chloride reference electrode under nitrogen bubbling in a 1 mol / L sodium hydroxide aqueous solution.SELECTED DRAWING: None

Disclosed herein is a battery for generating hydrogen. The battery comprises a working electrode; a reference electrode; a counter electrode; the electrolyte is sulfuric acid with the concentration of about 0.5 M; wherein the working electrode is prepared by coating a layer of ink on a glassy carbon electrode and air-drying the glassy carbon electrode; and the ink is prepared by mixing the TMD composite material decorated by platinum nanoparticles with a solution to form a mixture and carrying out ultrasonic treatment on the mixture, and the solution is composed of water, ethanol and 5% sulfonated tetrafluoroethylidene fluorinated polymer-copolymer dispersion according to a volume ratio of 4: 1: 0.1.

Disclosed herein are the synthesis and characterisations of the monoacrylate-functionalised phthalonitriles (PNs). Their chemical structures are verified with 1H nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR) spectra to confirm the successful synthesis. Subsequently, photopolymerisable resins, based on the prepared PN monomer, a commercial diacrylate and other additives can be formulated. Being post thermally treated, the PN based resins result in polymeric products with excellent thermal and mechanical performances, suggesting the high-performance nature of the PN based resins. Interestingly, the resins exhibit significant high carbon yield, indicating that they are greatly promising candidates as carbon precursors. As it is found that the resins have good three-dimensional (3D) printing capability and can be fabricated using high-resolution projection micro-stereolithography (PμSL) additive manufacturing technology, complex 3D structured objects are herein printed and performed follow-up post treatment. After being progressively pyrolysed up to 1000° C., the printed objects can be readily converted to glassy carbon (GC) structures with structural integrity and fidelity. Only ˜25% of shrinkage was found for the converted GC structure due to the significantly high char yield of the PN resins. This work not only expands the library of new class of high-performance PN resins for popular additive manufacturing but also features the precision 3D printing of GC with low shrinkage and high carbon yield for the first time.

The present invention relates to a method for treating a substrate having a free surface made of a semiconductor material, in particular a single–crystal semiconductor material, comprising a method for stabilising the surface against the formation of terraces and / or beads, the method comprising: • forming a vitreous carbon layer (30) by a gas-phase carbon reaction on the surface at a temperature (T1) greater than 700°C, preferably greater than 800°C, and strictly lower than 1000°C, preferably lower than 950°C, and more preferably lower than 900°C; and • applying a heat treatment to the substrate after stabilising the surface, wherein the vitreous carbon layer (30) limits the reorganisation of the surface made of a semiconductor material in the form of terraces, the depositing of the carbon layer (30) and the heat treatment being carried out in the same furnace.

The invention discloses a heat conduction assembly, a heat exchanger for chemicals and a preparation method of the heat conduction assembly, and belongs to the technical field of heat exchange. The heat exchanger for the chemicals comprises a cavity, heat exchange assemblies located on the two sides of the cavity and a heat conduction assembly attached between the cavity and the heat exchange assemblies, the heat conduction assembly comprises a heat conduction plate and a glassy carbon sheet, the glassy carbon sheet is attached to the center of the side, close to the cavity, of the heat conduction plate, and the cavity is connected with the heat conduction plate in a sealed mode. The heat exchange assembly comprises a heat exchange plate and a thermoelectric wafer, and the thermoelectric wafer is attached between the heat exchange plate and the heat conduction plate. On the premise that reaction with chemicals is avoided, the number of structural layers is reduced, the heat exchange efficiency is improved, installation is convenient, connection between the layers is reliable, and leakage is avoided.

The invention relates to the technical field of preparation of C / C composite coatings, in particular to a glassy carbon in-situ reaction SiC-based coating and a preparation method and application thereof.The method comprises the steps that glassy carbon powder is prepared from a carbon-containing precursor, the prepared glassy carbon powder serves as a supplementary carbon source, and mixed slurry is prepared from the supplementary carbon source and mixed ceramic powder; finally, a SiC-based coating preform is prefabricated and sequentially subjected to carbonization treatment and siliconizing treatment, glassy carbon serves as a supplementary carbon source to be subjected to an in-situ reaction with free silicon to generate SiC, and therefore the content of residual silicon is reduced, meanwhile, the compactness of the coating is improved, the internal structure and high-temperature oxidation resistance of the C / C composite material are improved, and the performance of the composite material is improved. The material is more stable in performance and longer in service life in a high-temperature environment, the glassy carbon is low in cost, simple and convenient to prepare and remarkable in economic advantage, and the problem that a C / C composite coating is poor in high-temperature stability in the prior art is solved.