104 results about "Glassy carbon" patented technology

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 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 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 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.

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.

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.

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 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.

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.

The invention discloses a potassium ion working electrode based on eggshell-shaped hollow carbon microspheres and a preparation method and application thereof, the electrode comprises a glassy carbon substrate and an ESHCMS layer modified on the surface of the glassy carbon substrate, and the ESHCMS layer is composed of eggshell-shaped hollow carbon microspheres. The eggshell-shaped hollow carbon microspheres are synthesized through a simple hydrothermal method, the prepared eggshell-shaped hollow carbon microspheres are good in graphitization degree, the large specific surface area, the excellent electronic conductivity and the excellent chemical stability of the eggshell-shaped hollow carbon microspheres and the high electric capacity and the good hydrophobicity when the eggshell-shaped hollow carbon microspheres serve as double electric layers are utilized, and the graphitization degree of the eggshell-shaped hollow carbon microspheres is improved. The potassium ion selective electrode is introduced between a polymer film and a glassy carbon substrate, so that a water layer between a conductive substrate and the polymer film is effectively eliminated, the potential of the potassium ion selective electrode is stabilized, and the sensitivity, selectivity and response speed of the working electrode are improved.

The invention discloses a glassy carbon mixed paving thickness optimization method for a head cover of a railway vehicle cab, solves the problem that the thickness of each layer in a composite board in the prior art is not reasonably optimized, and has the beneficial effect of effectively controlling the thickness of each layer in the composite board on the premise of ensuring the quality and rigidity of the head cover. According to the specific scheme, the method for optimizing the glassy carbon mixed laying thickness of the railway vehicle cab hood comprises the steps that the railway vehicle cab hood is made of a composite material hood, and the bending rigidity of the composite material hood per unit width is obtained; substituting the total thickness of the railway vehicle cab hood into the bending rigidity of the composite material hood in unit width to obtain a rigidity optimization formula; calculating the relationship between the thickness of the outer carbon fiber layer and the thickness of the inner glass fiber layer according to a rigidity optimization formula; and determining the optimal solutions of the thickness of the outer carbon fiber layer and the thickness of the inner glass fiber layer based on the relationship between the thickness of the outer carbon fiber layer and the thickness of the inner glass fiber layer by taking a weight reduction set value compared with the glass fiber reinforced plastic hood as a target.

An object of the present disclosure is to provide a grip rubber composition from which a crosslinked rubber having a great static frictional coefficient can be obtained. The present disclosure provides a grip rubber composition containing a base rubber, hard porous carbon particles and a vulcanizing agent, wherein at least one part of the hard porous carbon particle is composed of a glassy carbon, and an amount of the hard porous carbon particles ranges from 1.5 mass % to 8.5 mass % in 100 mass % of the rubber composition.

The present invention discloses a method for detecting the direct and indirect electron transfer capabilities of biochar. The method comprises the following steps: grinding and sieving the biochar, and then adding ultrapure water to prepare a biochar solution; activating a Shewanella stock solution, inoculating it into a sterilized LB culture medium, placing it in a shaker for cultivation, and repeatedly transferring it multiple times before adding ultrapure water to prepare a Shewanella solution; using an anaerobic state, using a three-electrode system connected to an electrochemical workstation, adding ultrapure water to a glassy carbon cup electrode, setting the voltage, and after the current stabilizes, injecting the Shewanella solution into the glassy carbon cup electrode of a control group, and injecting the Shewanella solution and the biochar solution into the glassy carbon cup electrode of an experimental group. In a current-time curve, the difference in peak current between the experimental group and the control group represents the direct electron transfer capability of the biochar, and the difference in stable current represents the indirect electron transfer capability of the biochar. The method of the present invention is simple and easy to implement, and directly demonstrates the direct and indirect electron transfer capabilities of the biochar.

The invention relates to a nano composite material, a glassy carbon modified electrode, an electrochemical sensor and a preparation method, and relates to the technical field of electrochemical sensing detection. Comprising the following steps: oxidizing carbon nano onions, and sequentially mixing the obtained oxidized carbon nano onions with methylene blue and gold nanoparticles, so as to obtain an AuNPs-MB-oxCNOs nano composite material; the preparation method comprises the following steps: modifying the surface of a glassy carbon electrode with an AuNPs-MB-oxCNOs nano composite material to obtain a carbon nano composite layer; and modifying the milt DNA on the carbon nano composite layer to obtain the glassy carbon modified electrode. According to the invention, methylene blue and gold nanoparticles are connected to oxidized carbon nano onion in a non-covalent manner, the prepared AuNPs-MB-oxCNOs nano composite material is used as a biocompatible matrix of milt DNA, and the PRO sensing electrochemical sensor is constructed by detecting a reduction value of an MB current signal based on adsorption of PRO on the milt DNA.

The invention discloses a preparation method of a gradient graphitized glassy carbon coating, glassy carbon layers with different graphitization degrees are constructed by gradient induction of glassy carbon graphitization, graphene oxide (GO) can induce polyacrylonitrile graphitization in a heat treatment process, and the higher the GO content is within a certain range, the more obvious the induction effect is. According to the preparation method, 30% of GO dispersion liquid is added into bottom-layer polyacrylonitrile, so that a GO / polyacrylonitrile film can reach the graphitization degree of 90% or above at the temperature of 2400 DEG C, and the glassy carbon coating with good conductivity, corrosion resistance, wear resistance and impact resistance is prepared.

The present invention provides a method for preparing a self-supporting silicon carbide film. The method of the present invention comprises: introducing carbosilane and reducing gas into a growth chamber for the first time, and maintaining the temperature of the glassy carbon substrate at 900°C-1200°C, the pressure at 8000-20000Pa, growing for 60min-120min, and forming a silicon carbide peeling layer; introducing carbosilane and reducing gas into the growth chamber for the second time, and maintaining the temperature of the glassy carbon substrate at 1100°C-1300°C, the pressure at 8000-20000Pa, growing for 240min-560min, and forming a silicon carbide support layer on the surface of the silicon carbide peeling layer. The present invention improves the method for preparing a silicon carbide film, so that the generated silicon carbide film can achieve complete self-stripping and self-support from the surface of the glassy carbon substrate, thereby improving the appearance morphology and structural performance of the silicon carbide film, and after continued deposition, the silicon carbide film is tightly combined with the silicon carbide coating product to form a silicon carbide semiconductor product with good integrity.

The invention discloses an immunosensor for detecting porcine epidemic diarrhea virus as well as a preparation method and a detection method of the immunosensor. The preparation method of the immunosensor for detecting the porcine epidemic diarrhea virus comprises the following steps: S1, sequentially adding H2O2 and concentrated nitric acid into an aqueous solution of tungstate for reaction to obtain a modification solution; s2, performing electrochemical deposition on the glassy carbon electrode by taking the modification liquid as electrolyte; s3, taking an aniline solution composed of concentrated sulfuric acid, aniline and water as an electrolyte, and performing electrochemical polymerization on the glassy carbon / tungsten oxide electrode; s4, placing the glassy carbon / tungsten oxide / polyaniline electrode in a chloroauric acid solution for electro-deposition; s5, dispensing a porcine epidemic diarrhea virus antibody on the surface of the glassy carbon / tungsten oxide / polyaniline / gold electrode, and incubating; and S6, dropwise adding bovine serum albumin on the surface of the glassy carbon / tungsten oxide / polyaniline / gold-antibody electrode, and sealing. The sensor has the advantages of high detection speed, high stability, strong anti-interference performance and the like.

The invention discloses a ceramic glass system wrapped carbonaceous composite wave-absorbing material and a preparation method thereof, and belongs to the field of electromagnetic wave absorbing materials, the preparation method comprises the following steps: preparing a core layer, preparing a shell layer, and carrying out heat treatment in a protective atmosphere; the preparation of the core layer comprises the following steps: mixing graphene and carbon nanotubes, uniformly stirring, placing in a crusher, adding a mixed solution of a sodium silicate solution and an aluminum dihydrogen phosphate solution while stirring and crushing, and stirring and crushing to obtain large blocky particles; in the step of preparing the shell layer, large blocky particles are subjected to first-time shearing and smashing, then a mixed solution of kaolin, a sodium silicate solution and an aluminum dihydrogen phosphate solution is added for dispersion, second-time shearing and smashing are conducted, drying is conducted, and a ceramic glass-carbon material is obtained; the ceramic glass system coated carbonaceous composite wave-absorbing material prepared by the invention has excellent oxidation resistance, and still has excellent wave-absorbing performance and long service life in a high-temperature environment.

The utility model relates to the technical field of coating devices, and particularly discloses a reciprocating type glassy carbon graphite coating coating device which comprises a base, an air cylinder I is mounted on the surface of the base, and a shell is mounted on the surface of the base; a sliding structure is arranged in the shell, and the sliding structure is characterized in that a coating material box is installed on the surface of the shell, a pump body is connected to the surface of the shell, one end of the pump body is connected with the coating material box, one side of the pump body is connected with a pipeline, and a second air cylinder is embedded in the inner wall of the coating material box. According to the reciprocating type glassy carbon graphite coating coating device, a sliding structure is arranged, an infrared sensor is used for detecting materials, the infrared sensor controls a second air cylinder to move, the second air cylinder drives a spray head to move, the moving distance of the spray head can be controlled according to the size of the materials, and coating waste is reduced; and reciprocating spraying is conducted on the materials, and the practicability of the device is improved.