1119 results about "Metal nanoparticles" patented technology

The invention relates to the field of lithium battery negative electrode materials, in particular to a silicon-based compound negative electrode material and a preparation method thereof.The negative electrode material comprises a compound of a silicon-based material and niobium-based composite oxide and metal nanoparticles loaded on the compound, the surface of the silicon-based material is coated with at least part of the niobium-based composite oxide, and the surface of the silicon-based material is coated with at least part of the niobium-based composite oxide. The negative electrode material is relatively good in conductivity, the conductivity and the lithium intercalation potential of the silicon-based composite negative electrode material are improved, the silicon-based material is prevented from generating side reaction with a solid electrolyte of a solid-state battery under low potential, meanwhile, the volume expansion of the silicon-based material in the charging and discharging process is relieved, and the comprehensive performance of the silicon-based solid-state battery is effectively improved.

The invention discloses a composite negative electrode material and a preparation method thereof and a lithium battery, the composite negative electrode material provided by the invention comprises a three-dimensional porous carbon material, and a lithium-loving metal and a lithium metal which are loaded on a three-dimensional porous carbon skeleton, and the three-dimensional porous carbon material is prepared by taking a ZIFs precursor as a raw material. The three-dimensional porous carbon material prepared by taking the ZIFs precursor as a raw material has a Zn / N-containing double-doped three-dimensional porous carbon skeleton, so that the problems of poor conductivity, insufficient lithium storage aperture and the like of the existing carbon skeleton are solved; a plurality of lithium-loving metal nanoparticles are loaded on the surface of the carbon skeleton, so that the lithium-loving property and the electron conductivity of the carbon skeleton are further enhanced, the uniform deposition of lithium is facilitated, and the growth of dendrites is inhibited; the porous carbon skeleton limits the lithium deposition space, the doped nanoparticles provide lithium-loving sites to guide uniform nucleation, the dual mechanisms synergistically inhibit dendritic crystal growth, and the safety of the lithium metal negative electrode is improved.

The invention belongs to the technical field of engineered probiotics, and particularly relates to engineered probiotics for radiosensitization and tumor metabolism regulation as well as a preparation method and application of the engineered probiotics. The engineering probiotics comprise probiotics and core-shell type metal nanoparticles which are loaded on the probiotics and are synthesized through a biological directional mineralization effect; the core of the core-shell type metal nanoparticle is a palladium element, and the outer layer of the core-shell type metal nanoparticle is a palladium element and a gold element. The engineering probiotics provided by the invention have excellent enzyme catalysis performance and can target and retain in tumor sites, and through the synergistic effect of all components in the engineering probiotics, adenosine metabolism is effectively inhibited, secretion of pro-inflammatory cytokines is enhanced, tumor microenvironment is promoted to be converted into an inflammatory state, up-regulation of immune checkpoints is inhibited, and the immune checkpoints are inhibited. And T cells are inhibited from being transformed into depletion phenotype and transformed into effect type from depletion type. After the SBRT and the immune checkpoint inhibitor are combined for use, the growth of tumors can be effectively inhibited, and the effect of enhancing immune radiotherapy is achieved.

The invention discloses a microbial electrochemical efficient preparation method and application of metal nanoparticles, the metal nanoparticles are prepared and synthesized by regulating the redox metabolism behavior of microorganisms through positive / negative constant potential, and the microorganisms are electroactive microorganisms domesticated and cultured by activated sludge or single bacteria; the metal nanoparticles are in a solid state of a metal simple substance, are formed on the surface of an electroactive biological membrane, and are generated by electroactive microorganisms through extracellular electron transfer dissolved-state metal salt reduction. The palladium or silver and other metal nanoparticles prepared by the method are uniformly distributed on the surface of the electroactive biological membrane, the particle size is 1-10nm, the electroactive biological membrane-metal nanoparticle complex has extremely strong reducibility, and the electroactive biological membrane-metal nanoparticle complex is used for treating a non-biodegradable organic pollutant (4-chlorophenol), so that compared with a non-electroactive biological membrane and a treatment group without metal ions, the electroactive biological membrane-metal nanoparticle complex has the advantages that the biodegradability is greatly improved; the degradation effect is the best.

The invention relates to the technical field of preparation of nano catalytic materials, in particular to a preparation method of hierarchical pore channel mesoporous carbon loaded metal nanoparticles. According to the invention, biomass diatomite is used as a template to construct a vertically through macroporous channel, a block copolymer is introduced to form an ordered mesoporous structure, and a pore-foaming agent is added to generate a macro-pore network in a pyrolysis process, so that a macro-pore-mesoporous-micropore three-level communicated carbon-based skeleton is realized; and a bimetallic component is loaded on the hierarchical porous mesoporous carbon in a gradient confinement manner. The material disclosed by the invention has the advantages of fast mass transfer of macropores, stable nanoparticles of mesoporous confinement and efficient catalysis of monatomic sites, and can efficiently catalyze and degrade various wastewater organic pollutants in a wide pH range.

The invention discloses a method for preparing cyclohexylamine based on reductive amination of cyclohexanone, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: adding a reactant cyclohexanone into a reaction kettle containing a certain amount of solvent, ammonia water and hydrogen atmosphere, and carrying out reductive amination reaction in the presence of a catalyst to obtain cyclohexylamine. The catalyst is CoyAl-LDHs loaded with metal active components, the CoyAl-LDHs are layered cobalt-aluminum bimetal hydroxides, and cobalt ions and precious metal ions in laminates are subjected to spontaneous oxidation-reduction reaction, so that the precious metal ions can be efficiently reduced into active metal nanoparticles. The layered cobalt-aluminum double-metal hydroxide not only has abundant surface acid-base sites, but also has high dispersity of loaded metal nanoparticles. The catalyst preparation and reductive amination reaction conditions are mild, the yield is high, the reaction system is simple and easy to separate, and the method is suitable for industrial production of cyclohexylamine.

The invention provides a compound disinfectant for preventing and treating aquaculture virus diseases and a preparation method thereof. The composite disinfectant is prepared by introducing polyhexamethylene guanidine or a salt thereof, a quaternary ammonium salt compound, metal nanoparticles and an auxiliary agent into a water system as main raw materials, and is prepared by the following steps: adding a quaternary ammonium salt compound solution and a penetrating agent into a polyhexamethylene guanidine or salt solution thereof, and uniformly stirring and mixing to obtain a mixed solution A; slowly dropwise adding the metal nanoparticle dispersion liquid into the mixed solution A, starting ultrasonic treatment at the same time, and uniformly stirring and mixing to obtain a mixed solution B; dropwise adding the pH regulator solution into the mixed solution B, regulating the pH, adding the preservative solution, supplementing water, uniformly mixing, standing and curing to obtain the composite disinfectant. The compound disinfectant aims at achieving synergistic interaction, finally achieves the comprehensive prevention and treatment effects of being efficient, low in toxicity, broad in spectrum and not prone to inducing drug resistance, and particularly achieves efficient and safe prevention and control on fish, shrimp and crab virus diseases so as to meet the urgent requirement for healthy aquaculture.

The invention relates to the technical field of electro-catalysis, in particular to a modified iron monatomic catalyst based on biomass carbon as well as a preparation method and application of the modified iron monatomic catalyst. The preparation method comprises the following steps: mixing and stirring chitosan, an acetic acid solution, thiourea and ferric chloride, adjusting the pH value to 7.5-8.5, and freeze-drying to obtain an aerogel precursor; pre-carbonizing the aerogel precursor to obtain a pre-carbonized product; mixing the pre-carbonized product with an alkali reagent, and calcining to obtain a metal nanoparticle doped monatomic catalyst; and carrying out ultrasonic treatment on the metal nanoparticle doped monatomic catalyst by using a mixed acid solution, washing to be neutral, and drying to obtain the modified iron monatomic catalyst. By adopting the modified iron monatomic catalyst provided by the invention, non-polar CO2 molecules and NO3 <-> are efficiently converted into urea under mild conditions, the yield of the urea is up to 2978.6 mu g h <-1 > mgcat <-1 >, and the maximum Faraday efficiency is up to 30.4%.

The invention provides a method for preparing a flexible circuit through ultrafast laser sintering of metal nanoparticles, and the method comprises the following steps: S1, coating the surface of a flexible substrate with metal nanoparticle slurry, and drying the metal nanoparticle slurry to form a metal nanoparticle layer; s2, the flexible base material is preheated through a preheating device; s3, pulse laser generated by the ultrafast laser light source is focused on the surface of the metal nanoparticle layer, and a metal nanoparticle sintering area is formed through sintering; and S4, preparing a patterned flexible circuit. The metal nanoparticles are preheated and softened, so that the deformation resistance of the metal nanoparticles is reduced; low-temperature sintering of metal nanoparticles on the flexible substrate and preparation of a flexible circuit are realized through a thermal-mechanical composite effect introduced by ultrafast laser, the nanoparticles are fully coalesced, the conductivity of a conductive region is high, and the selection range of a flexible substrate material is wide; by introducing the bonding layer into the flexible substrate, the conductive area is semi-embedded into the substrate, and the mechanical deformation durability of the flexible circuit is good.

The invention discloses a longitudinally conductive basalt fiber composite material and a preparation method thereof, and belongs to the technical field of fiber reinforced composite materials, and the preparation method comprises the following steps: treating a desized basalt fiber plain weave fabric in a high-temperature and high-pressure water environment to obtain a hydroxylated basalt fiber plain weave fabric; dispersing the metal nanoparticles in a tannic acid solution to obtain tannic acid modified metal nanoparticles; depositing the tannic acid modified metal nanoparticles on the surface of the hydroxylated basalt fiber plain weave fabric to obtain a metal nanoparticle modified basalt fiber plain weave fabric; dispersing the conductive filler, blending with polycarbonate, and performing hot pressing to prepare a composite sheet; laying, hot-pressing and annealing the metal nanoparticle modified basalt fiber plain weave fabric and the composite sheet to prepare the basalt fiber composite material; by modifying the basalt fiber plain weave fabric, the interface bonding between the basalt fiber plain weave fabric and the matrix is increased, and the conductive composite sheet is introduced, so that the longitudinal conductivity of the basalt fiber composite material is improved.

The invention discloses an SERS (Surface Enhanced Raman Scattering) substrate for solution in-situ rapid detection as well as preparation and application thereof, and belongs to the technical field of substance detection. Comprising a substrate, a nanorod array film growing on the substrate, and metal nanoparticles deposited on the outer side surfaces of nanorods. The sensor has the advantages of portability of a solid substrate, strong plasmon resonance absorption in a broadband visible light region, strong surface enhancement effect and the like, and trace substances and microorganisms in a solution can be rapidly detected through the surface enhancement Raman effect; when substances in a solution are tested, pretreatment such as mixing, adsorption and drying is not needed, the limitation that in-situ detection of a traditional surface enhanced Raman base in the solution cannot be achieved is broken through, pretreatment-free in-situ and second-level ultrafast detection can be achieved, operation is easy, cost is low, and sensitivity is high. The problems that an existing SERS substrate is poor in stability and repeatability, and in-situ, ultrafast, trace and portable detection of substances in a solution cannot be achieved are solved.

The invention discloses an attachable flexible temperature sensor and a manufacturing process thereof. The flexible sensor comprises a flexible substrate layer made of a polyimide material; the flexible temperature sensitive layer is arranged on the flexible substrate layer and is formed by polymerizing a carbon material and conductive metal nanoparticles, and the carbon material is graphene or graphene oxide; and the flexible electrode is arranged on the flexible temperature sensitive layer. Compared with a traditional temperature sensor, the flexible temperature sensor has flexibility and still has good sensitivity and response speed on the premise of bending deformation.

A self-adaptive high-precision line repairing method comprises the following steps that S1, a detected sample is irradiated through a light source, and a CCD high-resolution camera collects image data to detect defects existing in a line; s2, analyzing the collected defect image data through an image analysis device to obtain a repair path of the nozzle, and calculating an operation parameter of the self-adaptively changed nozzle by using an empirical formula; s3, ablating the target electrode through an electric spark ablating device to prepare nano metal particles; s4, the flow rate of inert gas is adjusted through a carrier gas flow rate control device, and the nano-metal particles are conveyed into a nano-particle printing and sintering device; s5, printing the metal nanoparticles to the line defect position through a dry aerosol printing nozzle, and realizing the complete repair of the line through the movement of the nozzle and the assistance of a movable platform below the substrate; and S6, a pressurizing pump and a heating assembly are started to pressurize and heat the metal nanoparticles on the substrate in the sintering cavity. According to the scheme, the processing efficiency of line repair is improved.

Reliable hybrid bonded apparatuses are provided. An example process cleans nanoparticles from at least the smooth oxide top layer of a surface to be hybrid bonded after the surface has already been activated for the hybrid bonding. Conventionally, such an operation is discouraged. However, the example cleaning processes described herein increase the electrical reliability of microelectronic devices. Extraneous metal nanoparticles can enable undesirable current and signal leakage from finely spaced traces, especially at higher voltages with ultra-fine trace pitches. In the example process, the extraneous nanoparticles may be both physically removed and / or dissolved without detriment to the activated bonding surface.

A watch part includes a base, a first layer formed by applying a decorative material to a surface of the base, a second layer formed by applying a first resin material having light-transmitting properties to a surface of the first layer, and a third layer formed by performing ink jet printing using a metal nano-ink containing metal nanoparticles on a surface of the second layer.

A method for manufacturing a semiconductor structure includes: forming a first bonding layer on a device substrate, the first bonding layer including a first bonding sub-layer and a second bonding sub-layer, the first bonding sub-layer including a first metal oxide material in an amorphous state and a plurality of metal nanoparticles, the second bonding sub-layer including a second metal oxide material in an amorphous state; forming a second bonding layer on a carrier substrate, the second bonding layer including a third metal oxide material in an amorphous state; conducting a surface modification process on the first and second bonding layers; bonding the device and carrier substrates to each other through the first and second bonding layers; and annealing the first and second bonding layers to convert the first, second, and third metal oxide materials from the amorphous state to a crystalline state.

The embodiment of the invention discloses a nano composite material and a preparation method, a use method and a device thereof, and the nano composite material is characterized by comprising a first nano particle and a second nano particle which are combined; the first nano-particles are transition metal nano-particles, and the second nano-particles are one or a combination of the following materials: lithium nitride nano-particles, lithium oxide nano-particles, lithium phosphide nano-particles, lithium selenide nano-particles and lithium sulfide nano-particles. The nano composite material can be subjected to magnetic regulation and control under low voltage, and high-speed and high-density electronic spin information storage is realized.

A method of making colloidal kagome superlattices can include functionalizing a plurality of metal nanoparticles with a plurality of oligonucleotides to produce programmable atom equivalents; and cooling the programmable atom equivalents to induce crystallization of the programmable atom equivalents. The cooling process can include cooling the PAEs from a first temperature to a second temperature at a first cooling rate, cooling the PAEs from the second temperature to a third temperature at a second cooling rate, and cooling the PAEs from the third temperature to a fourth temperature at a third cooling rate. The kagome superlattices can have a rhombohedral unit cell formed by alternating chiral layers of PAEs organized in 2-dimensional distorted kagome layers. The colloidal superlattices can have anisotropic light emission, Purcell factors of at least 25 and birefringent properties.

Provided is a manufacturing method of a structural battery electrode. The structural battery electrode manufacturing method includes preparing a fiber fabric substrate; forming a metal nanoparticle layer by providing metal nanoparticles on the fiber fabric substrate; and forming a carbon nanotube layer by providing a carbon source on the metal nanoparticle layer.

Substrates may be metallized by introducing a seed layer upon a base substrate, mechanically polishing the seed layer, and forming a metal layer upon the seed layer after mechanical polishing. The base substrate may comprise a ceramic, such as silicon nitride or aluminum nitride, a polymer, silicon, metal, or glass. The seed layer optionally may be rendered electrically conductive by mechanical polishing of an initially non-conductive seed layer. The metal layer may be formed by depositing a metal nanoparticle composition upon the seed layer after mechanical polishing and consolidating metal nanoparticles therein, such as through a hot pressing operation. The metal nanoparticle composition may contain one or more additives that facilitate CTE matching of the metal layer to the base substrate.

The invention discloses a negative electrode composite current collector of a non-negative electrode lithium battery and a preparation method of the negative electrode composite current collector. The preparation method comprises the following steps: preparing a metal nanoparticle-metal organic framework composite material MNP-MOF-NH2 by adopting a solvothermal method; the preparation method comprises the following steps: adding MNP-coated MOF-NH2, a conductive agent and a binder into a solvent, mixing and uniformly stirring to obtain a negative electrode coating slurry, coating the surface of a negative electrode current collector foil with the negative electrode coating slurry to form a first coating, placing the first coating in a reaction chamber of atomic layer deposition equipment, introducing a metal source and gas in an alternate feeding deposition mode to generate a layer of compact lithium-loving metal oxide, and carrying out vacuum drying to obtain the lithium-loving metal oxide negative electrode. And drying to obtain a double-gradient composite protective layer, namely the negative electrode composite current collector of the non-negative electrode lithium battery. According to the invention, a double-layer structure of a compact lithium-loving layer, a porous metal organic framework and a metal particle composite layer is constructed, and the upper lithium-loving metal oxide induces uniform nucleation of lithium, so that the deposition barrier is reduced. The network structure of the lower layer MOF provides a space limiting effect to accommodate and separate lithium deposition, in addition, polar groups contained in the MOF promote desolvation and transport of Li +, and metal nanoparticles accelerate ion / electron transport.

The invention relates to a method and a system for reversibly regenerating an inactivated carbon dioxide reduction electrode based on electro-catalysis, which comprises the following steps: firstly, controllably removing pollutants on the surface of the electrode by reversely applying an oxidation potential, and then introducing an electroplating solution containing metal ions and applying a dynamic reduction potential; metal nanoparticles are deposited on active sites on the surface of the catalyst in situ, and the active sites are reconstructed and optimized. According to the method, the initial catalytic performance of the electrode can be basically recovered, the catalytic activity can be recovered, the operation process is compatible with the continuous production requirement, and a core guarantee is provided for efficient and continuous industrial application of the electrocatalytic carbon dioxide reduction technology.

The invention relates to a preparation method and application of a two-dimensional ultrathin porous nitrogen-doped carbon composite material. According to the invention, a metal salt nitrate ion mediation method is adopted, and the ultrathin porous carbon nanosheet loaded with metal single atoms and metal nanoparticles is successfully prepared through decomposition of a prepolymerized dopamine-metal salt precursor. By changing the type of metal salt ligand anions, accurate regulation and control between a non-porous structure and a porous structure can be realized. Endogenous multi-scale pore defects are introduced into the surface of the carbon nanosheet, so that the impedance matching of the prepared carbon nanosheet system is effectively improved, and meanwhile, high conductivity is kept. According to the prepared material, the dielectric constant is improved by introducing a porous structure, impedance matching is optimized, and the electromagnetic wave absorption capacity is improved.

The present application relates to the technical field of nano-catalytic material preparation, in particular to a preparation method of multi-stage pore mesoporous carbon loaded metal nanoparticles, which constructs vertical and through macroporous channels by taking biomass diatomite as a template, forms ordered mesoporous structure by introducing block copolymer, and realizes macro-pore-mesopore-micropore three-stage communication of carbon-based skeleton by adding porogen to produce macro-porous network in the pyrolysis process, and gradientally limits and loads bimetallic components on the multi-stage pore mesoporous carbon. The material has the advantages of macroporous rapid mass transfer, mesoporous limited stable nanoparticles and single-atom site efficient catalysis, and can efficiently catalyze and degrade various wastewater organic pollutants in a wide pH range.

The invention discloses a targeted screening method and application of a xanthine oxidase inhibitor in radix puerariae, and belongs to the technical field of medicinal chemistry. A surface chemical exchange method is carried out on xanthine oxidase through a ligand fishing technology, ligands of active groups of xanthine oxidase are modified to the surfaces of magnetic metal nanoparticles, the magnetic metal nanoparticles and a to-be-separated solution are incubated together, and then specific components with the xanthine oxidase inhibiting effect are successfully screened out through a UPLC-Q-TOF-MS / MS technology. The combination of the active component and the XOD active site is verified through molecular docking simulation to confirm that the active component is an effective inhibitor. The invention provides a reliable basis for further clinical research and development of drugs for treating hyperuricemia, and has a wide application prospect.

The invention relates to the technical field of carbon materials, in particular to a nanocarbon catalyst for a carbon nanotube, a preparation method and a preparation method of the carbon nanotube, and the preparation method comprises the following steps: providing a carbon source, a heteroatom source, a metal salt with a catalytic active component and an inert material lining; dissolving a carbon source, a heteroatom source and a metal salt in a solvent to form a reaction solution; the reaction liquid is transferred into an inert material lining, a heating reaction is conducted for a period of time, a product is collected after cooling is conducted, the nano metal / carbon catalyst powder is obtained, the nano metal / carbon catalyst powder is of a C-X-Me structure, C represents a carbon element, X represents a heteroatom element, Me represents a metal element, and the C-X-Me structure is formed by chelating C-X sites and metal nanoparticles. The catalyst activity can be remarkably improved, and the high-temperature aggregation and sintering phenomena of the catalyst can be inhibited.

Reliable hybrid bonded apparatuses are provided. An example process cleans nanoparticles from at least the smooth oxide top layer of a surface to be hybrid bonded after the surface has already been activated for the hybrid bonding. Conventionally, such an operation is discouraged. However, the example cleaning processes described herein increase the electrical reliability of microelectronic devices. Extraneous metal nanoparticles can enable undesirable current and signal leakage from finely spaced traces, especially at higher voltages with ultra-fine trace pitches. In the example process, the extraneous nanoparticles may be both physically removed and / or dissolved without detriment to the activated bonding surface.

The invention provides a black TiO2 nanosheet (at) Pt nanoparticle photoelectric catalyst and a preparation method and application thereof in methane photoelectric catalytic conversion, black TiO2 is prepared by introducing surface defects (such as oxygen vacancies) so as to expand the visible light response range of the black TiO2, and the surface of the black TiO2 is modified by precious metal nanoparticles (such as Pt), so that the visible light response range of the black TiO2 is expanded. While the photo-induced electron separation is promoted and the catalytic activity is improved, the overall conductivity and the interface electron transfer rate are remarkably improved. Particularly, TiO2 is constructed into an ultrathin two-dimensional nanosheet structure, so that not only can a larger specific surface area and more reaction active sites be provided, but also the diffusion path of photon-generated carriers can be shortened, and the recombination probability can be effectively reduced, thereby further enhancing the photoelectric conversion efficiency. Compared with the prior art, the catalyst provided by the invention has the advantages of ultrathin two-dimensional structure, surface defect regulation and precious metal synergistic modification, and can realize efficient visible light driven photoelectrocatalytic methane conversion.

The invention relates to a preparation method and application of a melamine polymer hydrophilic modified PVDF (Polyvinylidene Fluoride) composite material. The preparation method comprises the following steps: dispersing hydrophobic PVDF nanoparticles in water, and adding an organic solvent to form a white uniform PVDF emulsion S1; dissolving melamine in a formaldehyde aqueous solution, or additionally adding a metal salt to form a clear solution S2; s1 is added into S2, and the mixed solution is kept in a uniform emulsion state; the melamine polymer hydrophilic modified PVDF composite material is prepared through a hydrothermal reaction and has hydrophilicity. Different from conventional hydrophilic modification, the method has the advantages that in-situ hydrophilic modification is carried out on the PVDF surface through a simple and easily-controlled hydrothermal treatment process, and the hydrophilic performance is improved. The melamine polymer surface functional groups and the spatial network structure are beneficial to loading of metal nanoparticles and providing of catalytic active components. The melamine polymer hydrophilic modified PVDF composite material can be applied to the fields of catalysis, oil-water separation, filtering membranes, coatings and the like, and the product performance is improved.

The invention discloses a heterojunction material, a preparation method of the heterojunction material and application of the heterojunction material in photocatalytic reduction of CO2 to generate C2H4. The heterojunction material comprises titanium dioxide and a metal organic framework material, wherein M metal nanoparticles are loaded on the surface of the metal organic framework material; in the heterojunction material, the loading capacity of the titanium dioxide is 20%-70%. The M / TiO2 / MFU-41 heterojunction material disclosed by the invention, as a photocatalyst, shows excellent catalytic performance in the aspect of reducing CO2 into C2H4 through photocatalysis, can be used for remarkably improving the photocatalytic activity and the selectivity of producing ethylene, and shows good stability in multiple cycles.