249 results about "Nanodiamond" patented technology

The invention relates to a chip integrated heat dissipation system and a preparation method thereof, and belongs to the technical field of heat dissipation of semiconductor devices. The chip integrated heat dissipation system comprises a nano-diamond transition layer attached to a chip. A micro-column array supporting layer is arranged on one side, far away from the chip, of the nano-diamond transition layer; the micro-column array supporting layer is in contact with one surface of the diamond film, and the other surface of the diamond film is attached to the three-dimensional micro-channel heat dissipation layer. The invention also provides a preparation method of the chip integrated heat dissipation system. The chip integrated heat dissipation system provided by the invention has the advantage of efficient heat dissipation, and through the combination of the three-dimensional structure and the high heat conduction characteristic of diamond, the heat dissipation power density is remarkably improved, the junction temperature of the chip is reduced, and the heat dissipation requirement of a high-power device is met. The heat dissipation performance reliability is high, the thermal stress is eliminated through the gradient structure design, the interlayer binding force is improved, and the stable performance is still kept after multiple thermal cycles. And the preparation process is good in compatibility and convenient for large-scale production.

The invention belongs to the technical field of catalyst preparation, and provides an M2 diatomic site catalyst for a reaction for preparing phenylenediamine through dinitrobenzene hydrogenation and a preparation method and application thereof.The catalyst is formed by anchoring transition metal M diatomic sites to the surface of a diamond-graphene carrier and is prepared by taking nano-diamond powder as a raw material through a one-step reaction. Annealing treatment is carried out at the high temperature of 750-850 DEG C, a diamond-graphene carrier of an sp3 atsp2 core-shell structure is constructed, and the surface defect density of the diamond-graphene carrier is regulated and controlled in the process; and depositing metal species on the surface of the carrier through ALD double-step deposition to obtain the M2 diatomic site catalyst with high density and stable structure. The M2 diatomic site catalyst is applied to a reaction for preparing a corresponding phenylenediamine compound through hydrogenation of a dinitrobenzene compound, and high conversion rate and high selectivity can be achieved with low metal loading capacity under mild conditions. The method can be popularized to construction of diatomic catalysts of various transition metals, and has a wide application prospect.

Luminescent diamond is made by subjecting a volume of diamond grains to high-pressure / high-temperature conditions with or without a catalyst or pressure transfer media to cause the grains to undergo plastic deformation to produce internal vacancy defects, increasing the luminescent activity / intensity of the resulting diamond material. The luminescent material is then subjected to further treatment to create quantum dots on the surface of the diamond particles. Quantum dot formation can include placing the diamond particles in liquid and subjecting the particles to laser pulses. The consolidated diamond material may be treated to further increase luminescent activity / intensity including reducing the consolidated diamond material to diamond particles, heat treatment in vacuum, and / or air heat treatment. The resulting luminescent diamond particles display a level of luminescence intensity greater than that of conventional luminescent nanodiamond, and may be functionalized for use in biological applications.

The invention discloses a nano-diamond reinforced powder metallurgy brake pad friction body material and a preparation method thereof, and relates to a brake pad friction body material and a preparation method thereof. The problem that in the prior art, the stability of a braking system of a train at a high running speed cannot be achieved is solved. The friction body material comprises a matrix component, a lubricating component, a friction component and a basic reinforcing component, wherein the sum of the mass percentages of the matrix component, the lubricating component, the friction component and the basic reinforcing component is 100%; wherein the mass percent of the copper powder in the matrix component is 50%-70%, and the mass percent of the iron powder in the matrix component is 10%-30%; the mass percent of the lubricating component is 10%-20%; the mass percent of the friction component is 1%-5%; the mass percent of the nano-diamond in the enhanced component is 0.1%-1%; the friction component is composed of one or more of silicon dioxide, aluminum oxide, titanium carbide, tungsten carbide, silicon carbide powder and zirconium oxide powder; the lubricating component is composed of one or more of graphite, carbon nanotubes and molybdenum disulfide. Belongs to the technical field of powder metallurgy.

The invention relates to the technical field of grinding fluid, in particular to efficient grinding fluid for an MPO connector, a preparation method and application of the efficient grinding fluid for the MPO connector. 27%-44% of alpha-aluminum oxide; 8%-15% of a styrene-maleic anhydride copolymer; 2%-5% of a modified polyurea solution; 0.05% to 0.3% of perfluoropolyether; 0.5%-2% of citric acid; 0.5%-1.5% of a polyether modified polysiloxane defoaming agent; by adopting a composite abrasive material system of the nano-diamond and the alpha-aluminum oxide, the grinding efficiency and the surface quality are improved in a breakthrough manner.

The invention provides a gradient composite graphene electrolysis electrode plate and an in-situ preparation method thereof. The electrode plate comprises a metal conductive base material (such as titanium alloy), a porous ceramic skeleton layer (Al2O3-40% ZrO2, the porosity of which is 30 + / -5%), a chemical copper plating layer for filling pores, an electroplated nickel-ruthenium alloy catalytic layer (Ni: Ru = 9: 1) and 3-5 graphene functional layers (ID / IG is less than or equal to 0.08) grown in situ, wherein the porous ceramic skeleton layer (Al2O3-40% ZrO2) is laser-cladded on the surface of the porous ceramic skeleton layer (Al2O3-40% ZrO2). The preparation method comprises the following steps: performing laser cladding on a ceramic skeleton, wherein the power density is 300-500W / mm < 2 >, and sintering at 1600 DEG C to form metallurgical bonding; gradient plating: electroless copper plating (containing nano-diamond enhancement) and pulse electroplating of Ni Ru (duty ratio is 1: 5); and performing directional CVD growth: after reducing the catalyst layer by H2 at 1050 DEG C, introducing CH4 / H2 (the volume ratio is 1: 4) in a pulse manner, and realizing full coverage of the inner wall of the mesh by vortex air intake. The technical effects are as follows: (1) the overpotential of chlorine evolution in saturated salt water at 80 DEG C is as low as 268mV (1A / cm < 2 >); (2) strong acid environment service life gt; the time is 100 thousand hours (12 times that of the national standard); (3) the production cost is lt; and 620 / m < 2 > (90% lower than that of a traditional ruthenium-iridium coating). The problems of graphene transfer damage and special-shaped electrode covering are solved.

The invention relates to the field of high-pressure pressure distribution calibration and imaging, in particular to a high-pressure diamond anvil cell internal pressure calibration / imaging system and method based on wide-field optical detection magnetic resonance. The invention discloses a high-pressure diamond anvil cell internal pressure calibration / imaging system based on wide-field optical detection magnetic resonance. The system comprises a fluorescence excitation and collection unit which comprises a wide-field optical detection magnetic resonance pressure distribution imaging light path based on nano-diamond NV color center fluorescence and a pressure calibration light path based on a ruby microsphere fluorescence spectrum. Compared with the prior art, the technical effects of the invention are that a traditional single-point detection mode is broken through through a wide-field microscopic imaging method, submicron spatial resolution and 0.0045 GPa / Hz1 / 2 noise measurement sensitivity are realized, and a brand new stress field characterization means is provided for a high-pressure experiment.

The invention relates to the technical field of superhard materials, and particularly discloses a polycrystalline diamond compact and a preparation method and application thereof.The preparation method of the polycrystalline diamond compact comprises the following steps that WC-Co alloy powder is sintered to obtain a hard alloy matrix; uniformly mixing nano diamond powder, micron diamond powder and cubic boron nitride, adding a reinforcing agent and a binding agent, and uniformly mixing to obtain a polycrystalline diamond layer mixture; the reinforcing agent is a nitrogen-boron doped graphene bonded amino carbon nanotube; a gradient transition layer raw material and a polycrystalline diamond mixture are uniformly spread on the surface of the hard alloy matrix in sequence, and then a composite blank is obtained through mold pressing; and sintering the composite blank to obtain the polycrystalline diamond compact. Graphene and carbon nanotubes are compounded to form a reinforcing agent with a three-dimensional network structure, so that the strength and wear resistance of the material are improved, and the service life of the material under harsh working conditions is prolonged.

The invention discloses an enhanced multi-network hydrogel electrolyte as well as a preparation method and application thereof, and belongs to the field of aqueous zinc ion batteries. Firstly, oxygen terminal nano-diamond is uniformly dispersed in deionized water to form a mixed solution, then sodium alginate is added to be fully dissolved, and the mixed solution is uniformly dispersed; the oxygen terminal nano-diamond-sodium alginate homogeneous solution is obtained. The solution is mixed with a polyvinyl alcohol solution which is completely molten through water bath heating and a proper amount of glycerol, and all the components are ensured to be uniformly distributed through sufficient stirring. And then, through repeated freezing and thawing and zinc ion cross-linking and curing effects, the oxygen terminal nano-diamond enhanced hydrogel electrolyte with a multi-network structure is finally formed. The oxygen terminal nano-diamond is highly uniformly dispersed in the hydrogel electrolyte, dendritic crystal growth and side reaction are effectively inhibited through a triple synergistic mechanism of enhancing the mechanical strength, reducing the free water content and increasing the zinc ion transference number by surface functional groups, and the super-long cycle stability is achieved.

The invention relates to the technical field of preparation of environmental functional materials, and discloses a directional synthesis method of magnetic porous iron-doped graphitized biochar, which is realized by the following steps: cooperatively inducing low-temperature graphitization by utilizing a biomass endogenous S < 2 > self-template and nano-diamond; performing double-complexing ultrasonic impregnation on the iron precursor to realize nanoscale dispersion; performing staged pyrolysis, pre-carbonizing in an inert atmosphere to construct a carbon skeleton, and synchronously completing iron reduction and graphitization in a reducing atmosphere; performing mixed pickling to synchronously remove the template and construct a passivation layer; and finally, carrying out magnetic separation to obtain the high-porosity and uniformly iron-doped magnetic graphitized charcoal. A graphitized porous structure is realized through cooperation of a low-temperature self-template and nano-diamond, iron agglomeration is inhibited through a double-complexing ultrasonic technology, a protective layer and active sites are synchronously constructed through mixed pickling and passivation, and three technical barriers of high-temperature collapse, iron particle inactivation and short cycle life of a traditional process are broken through.

The invention discloses a preparation method of a modified graphite / copper composite heat sink material, and belongs to the technical field of metal-based composite materials. The method comprises the following steps: carrying out acid activation on crystalline flake graphite, modifying the crystalline flake graphite with a silane coupling agent, and selectively stripping to obtain graphite nanosheets; preparing copper-based alloy powder containing at least two carbides of Zr, Cr and Ti; performing graded ultrasonic-ball milling composite dispersion on the surface modified graphite powder, the copper-based alloy powder, the nano-diamond powder, the carboxyl functionalized multi-walled carbon nanotubes and the graphene oxide; gradient filling cold pressing forming and pre-sintering are carried out; performing hot pressing / spark plasma sintering, applying a magnetic field or a vibration field to realize graphite orientation, generating a carbide interface transition layer in situ, and reducing graphene oxide; and after machining, pulse electrodeposition is carried out on the copper-graphene composite coating, and surface micropores / micro textures and phase change material filling can be selectively formed. The method is suitable for efficient heat management of high-power electronic devices.

This invention provides a highly efficient method for separating or concentrating lattice defect-containing nanoparticles (NDs). [Solution] A method for separating or concentrating lattice defect-containing ND particles, comprising irradiating a dispersion containing at least two types of ND particles selected from nanodiamond (ND) particles having at least one type of lattice defect and ND particles without the lattice defect with at least one type of excitation laser light having an energy greater than or equal to the resonance absorption energy of the lattice defect and at least one type of stimulated emission laser light, thereby selectively moving the ND particles having the lattice defect by the absorption optical pressure generated by the absorption of at least one type of excitation laser light and the stimulated recoil force generated by the action of at least one type of stimulated emission laser light, wherein the excitation laser light transitions electrons in the ground state of the ND particles to an excited state, and the stimulated emission laser light transitions electrons in the excited state to the ground state faster than spontaneous emission to generate stimulated recoil force.

The application discloses a surface strengthening method suitable for low-temperature steel friction pairs of polar ship with complex configuration, and aims at solving the problems of insufficient surface wear resistance of the friction pairs and difficulty in surface strengthening in the existing polar ship with complex configuration.The surface strengthening method of the low-temperature steel friction pairs comprises the following steps: firstly, polishing and ultrasonic cleaning are conducted on the low-temperature steel friction pair materials; secondly, nano-diamond particle powder and spherical hard ceramic particles are mixed by ball milling; thirdly, a nickel-based plating solution is prepared; fourthly, supersonic particle bombardment treatment is conducted on the surface of the clean friction pair materials; fifthly, a nickel-based plating layer is prepared by adopting a chemical plating or brush plating process; sixthly, the step four and the step five are repeated for multiple times; seventhly, a composite plating solution is prepared; and eighthly, a self-lubricating coating is prepared.The application prepares a multilayer composite structure coating comprising a hardening layer, an alloy layer and a self-lubricating layer, the coating has good combination performance, high hardness and wear resistance, and is suitable for the low-temperature steel friction pairs of the polar ship with complex configuration.

This invention relates to the field of heat dissipation technology, and more particularly to an optimization method and apparatus for a nanodiamond-copper gradient composite heat dissipation structure. The invention comprises the following steps: Step 100: Determining a three-dimensional geometric model of the nanodiamond-copper gradient composite heat dissipation structure based on its initial geometric parameters; Step 102: Assigning preset material properties to the three-dimensional geometric model to obtain a simulation model of the nanodiamond-copper gradient composite heat dissipation structure; Step 104: Determining the thermal conductivity of the nanodiamond-copper gradient composite heat dissipation structure under the initial geometric parameters based on the simulation model; Step 106: Updating the initial geometric parameters and repeating steps 100-106 until the optimization objective of the objective function is greater than a first preset value, thus obtaining the optimal geometric parameters. In this way, the invention can improve the heat dissipation performance of the nanodiamond-copper gradient composite heat dissipation structure.

The invention relates to the technical field of biological medicines, in particular to an anti-tumor compound as well as a preparation method and application thereof. The nano-diamond cannot effectively kill tumor cells due to good biocompatibility, and the ferrocene with an aromatic ring structure is combined with the nano-diamond, so that a good anti-tumor effect can be fully exerted. The TAT-PEG-PLGA has the advantages that the TAT-PEG-PLGA is high in membrane penetrating capability, water solubility, biocompatibility, stability and targeting property; the TAT-PEG-PLGA with adsorption force on the surface is used for loading the ferrocene-nano-diamond and the adriamycin to obtain the anti-tumor compound, so that the ferrocene-nano-diamond and the adriamycin can effectively enter tumor cells to jointly play an anti-tumor effect. The obtained anti-tumor compound can effectively inhibit the activity of melanoma cells A375, is an effective tumor inhibitor, and can provide a new treatment strategy and choice for tumor treatment.

This invention discloses a wire drawing die polishing paste and its preparation process. The polishing paste comprises the following components: 25-40% composite abrasive, 3-8% modified dispersant, 5-12% elastic binder, 2-6% lubricant, 1-4% polishing aid, and the balance being deionized water. The composite abrasive is composed of nano-diamond powder and boron carbide powder in a mass ratio of (1-3):1. This invention utilizes a composite abrasive of nano-diamond and boron carbide, which improves polishing efficiency and precision. The use of the modified dispersant significantly enhances the dispersion stability of the composite abrasive, reduces abrasive agglomeration, and ensures polishing uniformity. The use of the elastic binder reduces surface damage to the wire drawing die, extending its service life. The preparation process of this invention ensures full fusion of the components, thereby allowing precise control of the particle size distribution of the polishing paste, removing air bubbles and impurities, and significantly improving the stability and service life of the polishing paste.

This invention belongs to the field of superhard material synthesis technology, specifically disclosing a high-temperature, high-pressure preparation method for nano-polycrystalline diamond with synergistic mechanical and thermal properties. The method includes the following steps: precursor preparation: pre-pressing the precursor in a cemented carbide mold; octahedral assembly; wrapping the pre-pressed sample with platinum foil and placing it at the center of the octahedron; high-temperature, high-pressure sintering; stopping heating after heat preservation, allowing it to cool naturally to 23-25°C, then depressurizing, removing the octahedral assembly and the platinum foil wrapping, thus obtaining the synergistically enhanced nano-polycrystalline diamond. This invention employs the above-mentioned high-temperature, high-pressure preparation method for nano-polycrystalline diamond with synergistic mechanical and thermal properties. By combining nanodiamond powder with graphene, the sample assembly is optimized, and nano-polycrystalline diamond samples with excellent mechanical properties and significantly improved thermal conductivity are synthesized under relatively mild temperature and pressure conditions.

The invention relates to the technical field of polymer composite materials, in particular to a PTFE microwave composite dielectric substrate based on core-shell structure filler and a preparation method of the PTFE microwave composite dielectric substrate. The preparation method comprises the following steps: uniformly coating nano-diamond on the surfaces of hollow silicon dioxide microspheres by adopting an electrostatic self-assembly method to form a core-shell filler, then mixing the core-shell filler with polytetrafluoroethylene emulsion, and preparing the microwave composite dielectric material through calendaring molding and vacuum hot pressing methods. The nano-diamond shell layer can construct a continuous heat conduction network, and meanwhile the low dielectric constant characteristic brought by an internal hollow silicon dioxide structure is kept. In addition, the nano-diamond endows the hollow silicon dioxide microspheres with rough surfaces, and interface bonding between the hollow silicon dioxide microspheres and a polytetrafluoroethylene matrix is enhanced, so that thermal expansion is remarkably inhibited. The invention provides an effective way for solving the contradiction between the dielectric property and the thermal property of the polytetrafluoroethylene-based microwave composite dielectric material.

Luminescent diamond is made by subjecting a volume of diamond grains to high-pressure / high-temperature conditions with or without a catalyst to cause the grains to undergo plastic deformation to produce nitrogen vacancy defects in the diamond grains, increasing the luminescent activity / intensity of the resulting diamond material. The consolidated diamond material may be further treated to further increase luminescent activity / intensity, which treatment may comprise reducing the consolidated diamond material to diamond particles, heat treatment in vacuum, and air heat treatment, which reducing process further increases luminescent activity / intensity. The resulting luminescent diamond particles display a level of luminescence intensity greater than that of conventional luminescent nanodiamond, and may be functionalized for use in biological applications.

The application discloses a gradient diamond / molybdenum disulfide composite self-lubricating wear-reducing engineering ceramic coating and a preparation method thereof, belongs to the technical field of full ceramic self-lubricating wear-resistant coatings, and the coating is sequentially formed of a multi-stage size progressive diamond coating and a molybdenum disulfide coating from the surface of an engineering ceramic substrate to the outside. The multi-stage size progressive diamond coating comprises a micron diamond coating, a fine-grained diamond coating and a nano diamond coating, and the molybdenum disulfide coating is deposited on the diamond coating. The diamond coating is prepared by using a hot-wire chemical vapor deposition method, and the molybdenum disulfide film covering the diamond coating is prepared by using a direct-current magnetron sputtering method. Under certain conditions, the molybdenum disulfide in the composite coating reacts with the nano diamond and is converted into onion-like carbon, so that the hardness and lubricating performance of the composite coating are improved, and the friction and wear are reduced. The composite coating prepared by using the method has more stable bonding force and adhesion, and the service life of a machine is improved.

This invention relates to the field of cutting fluids, particularly to a biomimetic self-healing nanocomposite cutting fluid and its preparation method. The cutting fluid is composed of the following components by mass percentage: 5-10% lubricant, 2-5% extreme pressure anti-wear agent, 0.1-2% nanofunctional agent, 1-3% surfactant, 1-2% corrosion inhibitor, 0.5-1.5% pH stabilizer, 0.1-0.5% defoamer, 0.1-0.5% corrosion inhibitor, and the remainder being deionized water. This invention creatively introduces nanofunctional agents such as MXene and nanodiamond. These nanomaterials can form a high-strength, low-friction penetrating layer and repair film on the tool surface. During cutting, they actively fill the microscopic defects caused by tool wear, thereby achieving a "self-healing" effect. This characteristic can significantly reduce the coefficient of friction and cutting force between the tool and the workpiece, and tests have shown that it can extend tool life by more than 50%.

The invention relates to the technical field of synthesis of organic chemical raw materials, in particular to an atomic-scale dispersion Ru catalyst which comprises a carrier and an active metal component, and the active metal component is ruthenium, is loaded on the surface of the carrier in an atomic-scale dispersion ruthenium cluster form and is combined with defects or vacancies on the surface of the carrier; wherein the carrier is a nano-diamond / graphene composite material with a core-shell structure, the composite material takes nano-diamond as a core and takes graphene rich in defects as a shell to form a carbon core and carbon shell hybrid core-shell structure, the nano-diamond / graphene composite material with a unique core-shell structure is preferably adopted as the carrier, and the nano-diamond / graphene composite material with the unique core-shell structure is used as the carrier; the hybrid diamond core provides excellent mechanical and thermal stability, while the hybrid graphene shell layer is rich in edge defects and vacancies that provide ideal, high density anchoring sites for the Ru species.

Provided is a nanodiamond dispersion composition having excellent dispersibility of nanodiamond particles in an organic dispersion medium. A nanodiamond dispersion composition including an organic dispersion medium, nanodiamond particles dispersed in the organic dispersion medium, and a fatty acid ester dispersing agent, the nanodiamond particles being surface-modified by a surface-modifying group or compound containing an organic group. The fatty acid ester dispersing agent preferably has a mass loss rate of 30% or less when held in an air atmosphere at a temperature of 200° C. for 180 minutes.

Luminescent diamonds are produced by subjecting a volume of diamond grains to high pressure / temperature conditions, with or without a catalyst or pressure-transmitting medium, to plastically deform the grains, creating internal void defects and increasing the luminescence activity / intensity of the resulting diamond material. The luminescent material is then subjected to further processing to create quantum dots on the surface of the diamond grains. The formation of quantum dots can include placing the diamond particles in a liquid and subjecting the particles to laser pulses. The consolidated diamond material can be treated to further increase its luminescence activity / intensity, including reducing the consolidated diamond material to diamond particles, heat treatment in a vacuum, and / or air heat treatment. The resulting luminescent diamond particles exhibit higher levels of luminescence intensity than conventional luminescent nanodiamonds and can be functionalized for use in biological applications.

The invention discloses composite powder with low specific gravity and high thermal conductivity and application of the composite powder in thermal conductive gel. The low-specific-gravity high-thermal-conductivity composite powder is composed of 70-80 wt% of nano-diamond coated spherical boron nitride and 20-30 wt% of micron diamond. Wherein the nano-diamond is subjected to dry modification through a long-chain ammonium salt type cationic dispersant, then the nano-diamond and the spherical boron nitride are subjected to electrostatic self-assembly in an ethanol water solution to form a core-shell structure, and then the core-shell structure is treated through a short-chain silane coupling agent to obtain the nano-diamond coated spherical boron nitride. When the powder is applied to heat-conducting gel, 100 parts of vinyl silicone oil is used as a matrix, 500-600 parts of composite powder is filled, hydrogen-containing silicone oil, a platinum catalyst and an inhibitor are cooperated to prepare single-component gel, the heat conductivity coefficient of the prepared single-component gel can reach 6.0 W / (m.K), the specific gravity is smaller than or equal to 2.3, the weight of the prepared single-component gel is reduced by 10-30% compared with that of traditional filler due to high heat conductivity, and the single-component gel has excellent extrudability and storage stability. The method is suitable for lightweight thermal management of aircrafts, unmanned aerial vehicles and the like.

The invention discloses a preparation method of a fine structure surface RB-SiC friction pair based on throttling expansion self-suction type multiphase jet flow, and aims to solve the technical problems of poor uniformity and easy generation of microcracks in fine machining of an RB-SiC material. According to the method, negative pressure is formed through the throttling expansion effect generated when micron diamond gas jet flows through a Laval nozzle, nano diamond slurry with the shear thinning characteristic is automatically sucked in, and cell type diamond cluster abrasive multiphase jet is formed through online mixing; when the surface of a workpiece is impacted, grinding material clusters are depolymerized, uniform fragile region erosion of the material is achieved through the micron diamond, flexible finishing is conducted by means of ploughing and micro-cutting effects of the nano diamond, and therefore generation of micro cracks is synergistically inhibited. And in combination with a mask plate technology, the preparation of the high-quality fine structure surface is finally realized. Through the synergistic effect of multi-phase jet flow online mixing and cell type grinding materials, the quality of the machined surface is remarkably improved, and the method is suitable for preparing the high-performance RB-SiC friction pair.

The present invention relates to a method for preparing a nanodiamond-gold-polydopamine quantum sensor. The quantum sensor includes nanodiamonds and Au@PDA. The Au@PDA is obtained by forming PDA by self-polymerization of dopamine hydrochloride in an alkaline environment and is included on the surface of Au particles. The nanodiamond-Au@PDA quantum sensor is obtained by connecting Au@PDA to the surface of the nanodiamond through non-covalent coupling between biotin and streptavidin. By controlling the concentration of Au@PDA, the nanodiamond temperature transfer effect, energy transfer, and quantum spin signal are effectively regulated, thereby achieving improvements in the fluorescence intensity, fluorescence lifetime, optical detection magnetic resonance spectrum, and relaxation time of the nanodiamond nitrogen vacancy color center. The nanodiamond-Au@PDA quantum sensor prepared by the present invention has broad application prospects in quantum precision measurement and quantum computing.

Provided is a surface-modified nanodiamond having excellent dispersibility in an organic solvent, and a method capable of introducing various surface-modifying groups and easily producing surface-modified nanocarbon particles with little zirconia contamination. The surface-modified nanodiamond includes nanodiamond particles and a group that surface-modifies the nanodiamond particles and is represented by Formula (1): —X—R1 (1) [where X represents —NH—, —O—, —O—C(═O)—, —C(═O)—O—, —NH—C(═O)—, —C(═O)—NH—, or —S—; the bond extending left from X is bonded to a nanodiamond particle; R1 represents a monovalent organic group that does not have a hydroxy group, carboxy group, amino group, mono-substituted amino group, terminal alkenyl group, and terminal epoxy group; an atom bound to X is a carbon atom; and a molar ratio of carbon atoms to the total amount of heteroatoms selected from the group consisting of nitrogen atoms, oxygen atoms, sulfur atoms, and silicon atoms is 4.5 or greater.

The application relates to the technical field of ball valve production and processing, and discloses a production and processing technology of a sealed wear-resistant ball valve, which comprises the following steps: base material pretreatment, wear-resistant bottom layer preparation, functional coating slurry preparation, functional coating coating, sealing surface strengthening treatment, intelligent pressure detection module integration, closed-loop control system assembly, hot isostatic pressing densification treatment, precision calibration and performance testing, surface passivation and packaging. In the application, the nano diamond particles and the chromium-based tungsten carbide composite powder in the functional coating slurry jointly construct a high-hardness wear-resistant framework, resist the abrasive wear and erosion of the sealing surface, the molybdenum disulfide serves as a solid lubricant and forms a transfer film on the friction interface during the working process, reduces the friction coefficient, realizes the self-lubricating effect, the epoxy-modified organic silicon resin serves as a bonding phase, firmly combines the functional components, and endows the coating with good toughness and bonding strength, so that the wear-resistant life and reliability of the ball valve sealing pair are synergistically improved under harsh working conditions.

The application provides a nano-diamond compact and a preparation method and application thereof, and belongs to the technical field of diamond compacts. The nano-diamond compact provided by the application comprises a hard alloy substrate and superhard material hot-pressed on the surface of the hard alloy substrate, and the superhard material is prepared from raw materials with the following mass percentage: diamond micro powder 85-95.5%; cubic boron nitride 1.5-6%; tungsten carbide 1-3%; cobalt powder 1-5%; tantalum powder 0.5-3%; vanadium powder 0.2-3%; and graphene 0.1-1%. The cubic boron nitride, the tungsten carbide and the graphene can toughen and strengthen the nano-diamond compact; the cobalt powder, the tantalum powder and the vanadium powder can catalyze and bond. The nano-diamond compact has good toughness, and can effectively avoid the cracking of the nano-structure diamond compact.