590results about "Nano-carbon" patented technology

A composite, comprising a binder, the binder comprising one or more of polymeric, metallic, or ceramic, or pyrolytic carbon binder and a nanostructured carbon having a cellular structure. The cellular structure comprises one or more cell walls having a structure formed by a template and one or more cavities. Each cavity is substantially enclosed by the one or more cell walls and substantially unimpregnated by a liquid or solid.

The invention relates to the technical field of agricultural application of nano materials, and discloses a preparation method and application of a photosynthetic accelerant containing carbon quantum dots. Urea and citric acid are adopted as raw materials, and the nitrogen-carbon molar ratio and hydrothermal reaction parameters are optimized, so that efficient doping of nitrogen and accurate regulation and control of the particle size are achieved, and the photosynthetic accelerant containing the carbon quantum dots is obtained. The nitrogen-doped carbon quantum dot photosynthetic promoter with excellent upconversion performance is successfully synthesized, the promoter has good water solubility and biocompatibility, the photosynthetic efficiency of plants can be greatly improved within the concentration range of 0-100 mg / L, a safe application window is defined, and by establishing foliage spraying and water planting dual-mode application specifications, the application range of the nitrogen-doped carbon quantum dot photosynthetic promoter is widened, and the application range of the nitrogen-doped carbon quantum dot photosynthetic promoter is widened. The problems that current crops are insufficient in solar spectrum utilization and low in light energy conversion efficiency are solved in a targeted manner by utilizing an ultraviolet light-photosynthetically active radiation conversion function mediated by the carbon quantum dots and combining the targeted enrichment permeation characteristic of the carbon quantum dots in chloroplast.

The invention discloses a lycium ruthenicum biomass carbon dot as well as a preparation method and application thereof. The novel lycium ruthenicum carbon dots are prepared by taking lycium ruthenicum as a raw material and adopting a one-step hydrothermal method, and the novel lycium ruthenicum carbon dots are used for detecting residual herbicides in soil without being interfered by other substances. The method for detecting the herbicide residues in the soil by adopting the prepared novel carbon dots is superior to a large instrument, the detection method has the advantages of simplicity in operation, low cost, high sensitivity and the like, the source of the lycium ruthenicum is wide, and the preparation process is green and environment-friendly. Therefore, the prepared carbon dots provide a new method for detection of the fine phosphinate ammonium salt, and a thought and a method are provided for specific application in agricultural production.

The invention relates to the technical field of microfluidics, in particular to a carbon quantum dot hydrothermal synthesis system and method based on microfluidics thermal field equilibrium, which comprises a thermal field sensing module, an equilibrium analysis module, a thermal field coupling module, an equilibrium regulation and control module and a closed loop execution module, the thermal field sensing module is used for collecting array temperature on the surface of the micro-fluidic chip and fluid pressure data in a flow channel, and reconstructing three-dimensional temperature distribution in the micro-channel through a multi-physics field coupling algorithm to obtain a real-time thermal field state matrix. According to the invention, by constructing a multi-physical field coupling algorithm of a thermocouple array-flow resistance model-conjugate heat transfer equation, the three-dimensional temperature distribution of the fluid in the micro-channel can be inverted and reconstructed by using surface temperature and pressure data, so that a control system can pass through a chip matrix, and the temperature of the fluid in the micro-channel can be controlled. The radial temperature gradient and the axial thermal distortion in the fluid are directly sensed, the hysteresis and the error of sensor measurement are eliminated, and a real physical basis is provided for accurate temperature control.

The invention relates to the technical field of biomedical materials, in particular to a preparation method of TPP-mediated mitochondrial-targeted cerium-doped antioxidant carbon quantum dots, which comprises the following steps: mixing citric acid, urea and cerium salt serving as raw materials, and reacting by adopting a hydrothermal method to synthesize the cerium-doped carbon quantum dots; then triphenylphosphine is grafted to the surface of the cerium-doped carbon quantum dot through an amide method, separation and purification are carried out after the reaction is completed, the target carbon quantum dot is obtained, and the cerium element in the cerium salt is used for endowing the carbon quantum dot with an anti-oxidation function. The carbon quantum dots prepared by the method are accurate in mitochondria targeting and strong in oxidation resistance, the preparation process is simple, convenient, environment-friendly and large-scale, and the product is uniform in particle size, stable in fluorescence, good in biocompatibility and wide in application prospect in the field of biomedicine.

The invention discloses a high-entropy ferric pyrophosphate sodium ion battery positive electrode material and a preparation method thereof, and belongs to the field of battery positive electrode materials. The chemical formula of the positive electrode material is Na4Fe3-aMa (PO4) 2P2O7 (0.05 < = a < = 0.5), M is a metal element and comprises at least five of cobalt, magnesium, zirconium, zinc, aluminum, molybdenum, copper, manganese, nickel, calcium and chromium, the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is spherical, and the surface of the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is coated with an amorphous carbon layer. The preparation method adopts a sol-gel method and comprises the following steps: mixing an iron source, a doped metal source, sodium pyrophosphate, ammonium dihydrogen phosphate and citric acid monohydrate according to a stoichiometric ratio, stirring, gelatinizing and drying to obtain xerogel, and calcining through a two-stage hydrogen-argon mixed gas to obtain the iron-doped metal-doped sodium pyrophosphate / citric acid composite material. The crystal structure is optimized by means of the high-entropy synergistic effect, the electron conductivity and the Na < + > diffusion rate are improved, and the industrial adaptability of the spherical morphology and the structural stability of carbon coating are combined.

The invention discloses oyster shell-starch sludge carbon quantum dots and application thereof as a pepper growth promoter, and belongs to the technical field of organic fertilizers, soil improvement and waste utilization. Comprising the following steps: crushing oyster shells, mixing the crushed oyster shells with starch sludge, performing hydrothermal reaction, centrifuging, taking supernate, dialyzing, freezing and drying. The promoter can be used for enhancing photosynthesis of pepper leaves, promoting growth and yield increase of pepper in saline-alkali soil, and can be used as a promoter for growth and yield increase of pepper in saline-alkali soil. The plant height, stem diameter, leaf length, leaf width and fresh weight of the pepper treated by the oyster shell starch sludge carbon quantum dots are obviously improved. The maximum quantum yield, the actual photosynthesis efficiency, the absolute electron conductivity and the non-photochemical quenching coefficient of pepper plants can be obviously improved. The plant height, stem diameter, leaf area and single plant yield of pepper plants can be obviously improved when the fertilizer is applied to the field. After the calcium-doped carbon quantum dots are treated, the growth and development of the saline-alkali soil peppers are promoted, the photosynthesis of the saline-alkali soil peppers is promoted, and the yield of the peppers is increased.

The invention provides a preparation method of a hard carbon negative electrode material, the hard carbon negative electrode material and a sodium ion battery. The preparation method of the hard carbon negative electrode material comprises the following steps: taking coal chemical industry waste as a carbon precursor, crushing, and reacting with sulfuric acid to obtain an intermediate, with the concentration of the sulfuric acid being 30-80 wt.%; the intermediate and a catalyst are mixed and then subjected to carbonization treatment, the mixture is cooled to the room temperature at the cooling rate of 3-20 DEG C / min, carbide is obtained, and the catalyst comprises Fe2O3, B2O3 and ZnO; and after the carbide is subjected to acid pickling, a nano carbon film is formed on the surface through a magnetron sputtering technology. The preparation method provided by the invention can break through the bottleneck of the solid waste source carbon material in the aspects of structure and performance, and finally can realize the material performance with the initial coulombic efficiency of 90% or above, high magnification and long cycle life at the same time, thereby providing a brand new technical normal form for high-valued utilization of industrial solid wastes.

The invention discloses nitrogen-doped carbon quantum dots derived from American cockroach dregs as well as a preparation method and application of the nitrogen-doped carbon quantum dots, and belongs to the technical field of nitrogen-doped carbon quantum dots. The nitrogen-doped carbon quantum dots are prepared from the American cockroach dregs by a one-step hydrothermal method, optimal synthesis parameters are obtained through experimental optimization of synthesis conditions, and the prepared nitrogen-doped carbon quantum dots have excellent optical characteristics and stability; the invention also provides an application of the nitrogen-doped carbon quantum dot in Ag < + > detection, the nitrogen-doped carbon quantum dot has good selectivity, sensitivity and anti-interference performance on Ag < + >, a detection mechanism is an internal filtering effect and light-induced electron transfer, and the nitrogen-doped carbon quantum dot can be used as a preferred fluorescent material of an Ag < + > fluorescent sensor. The nitrogen-doped carbon quantum dots synthesized by the method not only have an Ag < + > sensing function, but also realize high-valued utilization of medicine residues, and also provide a new thought for self-doping of heteroatoms.

The invention discloses a carbon dot, hydrogel containing the carbon dot as well as a preparation method and application of the hydrogel, and relates to the technical field of carbon materials. The carbon dot is prepared from the following raw materials: a hydroxyl-containing flavonoid compound and epsilon-polylysine; the carbon dots contain aniline bonds formed by hydroxyl groups of the hydroxyl-containing flavonoid compounds and amino groups of the epsilon-polylysine. The carbon dot shows higher tumor cell killing property and lower normal cell toxicity than the raw material hydroxyl-containing flavonoid compound at the cellular level, can obviously induce immunogenic death of cancer cells and does not induce up-regulation of extracellular matrix collagen, and also has a better effect of regulating a tumor immune microenvironment.

The present invention relates to single-crystal spherical carbon nanoparticles that are single-crystals, are spherical, and have an average particle diameter of 1 nm to 30 nm. The single-crystal spherical carbon nanoparticles of the present invention can generate fluorescence with a high fluorescence quantum efficiency when excited by a light in wide wavelength range from ultraviolet light to visible light, and have fluorescence quantum efficiency of 10% or more compared to conventionally known carbon nanoparticles. The single-crystal spherical carbon nanoparticles can be used for drug delivery, because they do not have toxicities to living organisms that compound semiconductors made of cadmium, selenium, tellurium, and the like have. Furthermore, since the single-crystal spherical carbon nanoparticles are spherical, they can be densely packed as electrode materials for solar cells and secondary ion batteries, and can be used for negative electrode for lithium ion batteries or electrode material for solar cells.

This invention provides a sodium iron phosphate pyrophosphate composite material and its preparation method. The preparation method includes controlling the zinc and potassium content in hematite slag, mixing and dissolving the hematite slag with sodium, phosphorus, and carbon sources, and then drying the mixture to obtain a mixed solid powder. The mixed solid powder is then sintered under a protective atmosphere to obtain the sodium iron phosphate pyrophosphate composite material. The composite material has a core-shell structure, with the core being zinc and potassium-doped sodium iron phosphate pyrophosphate, and the coating layer is a carbon material. This invention allows for the direct use of hematite slag as an iron source to prepare the sodium iron phosphate pyrophosphate composite material, realizing the direct synthesis of battery materials from hematite slag produced by hydrometallurgical zinc refining.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a preparation method of a high-rate silicon-carbon composite negative electrode material. The silicon-carbon composite material takes a porous carbon material as a substrate, and is compounded by depositing a silicon source into the porous carbon substrate in a chemical vapor deposition manner; according to the excellent fast charging performance, the porous carbon substrate is prepared by adopting a tin source and potassium hydroxide synergistic activation strategy, and the limitation of a traditional single alkali activation (such as KOH) or metal auxiliary activation method is broken through. Through the synergistic effect of the two, a hierarchical pore structure with micropore-mesopore gradient distribution is realized, the silicon deposition bearing capacity and ion transport dynamics performance of porous carbon are remarkably improved, and a structural basis is provided for subsequent uniform deposition of silicon and rapid migration of lithium ions.

The invention belongs to the technical field of electrocatalytic materials, and discloses a CeO2 / NiCo2O4 heterojunction oxygen evolution reaction electrocatalyst and a preparation method thereof. According to the electrocatalyst, a composite protection layer composed of nitrogen-doped carbon quantum dots and CeO2 is constructed on the surface of a NiCo2O4 nanosheet array, cobalt ions are captured and dissolved out through pyridine nitrogen, reintegration is promoted through CeO2 oxygen vacancy, and interface dynamic self-repairing is achieved. And the nitrogen-doped carbon quantum dots are embedded into the CeO2 layer and are in direct contact with NiCo2O4 to synergistically inhibit cobalt loss and maintain structural integrity. By constructing the CeO2 / nitrogen-doped carbon quantum dot composite interface layer with dynamic ion capture and self-repairing capabilities, the problems of structure instability and performance degradation caused by cobalt ion dissolution of the NiCo2O4-based oxygen evolution reaction electrocatalyst under the working condition of strong oxidizing property are successfully solved; the method has important application value and industrialization prospect in the technical field of green hydrogen energy electrolyzed water.

The present invention provides a silicon-carbon composite negative electrode material and a preparation method therefor. The silicon-carbon composite negative electrode material is obtained by depositing silicon-containing particles on pores and surfaces of porous carbon, and then performing surface carbon coating. In an XPS Si 2p spectrum of the silicon-carbon composite negative electrode material, the surface of the material satisfies: 0.4<SSi-Si / SC-Si-O<0.7; and the interior satisfies: 3<SSi-C / SC-Si-O<4. The surface of the material refers to the XPS spectrum measured when the material has not been etched by an argon ion beam, and the interior of the material refers to the XPS spectrum measured after the material has been etched by an argon ion beam to a depth of 70nm. A material having the specified XPS Si 2p spectrum has significantly improved structural strength, capacity and conductivity, thereby improving cycle stability and fast charging performance, and achieving high energy density, for a lithium ion battery assembled using same.

This invention discloses a nitrogen-doped carbon quantum dot asphalt dispersant for water-based drilling fluids and its preparation method. The dispersant uses citric acid as the carbon source, 1-hexadecylamine as the nitrogen source, and a surface modifier. Nitrogen-doped carbon quantum dots are synthesized via solid-phase pyrolysis. These quantum dots are then added to water-based drilling fluid at a ratio of 0.01 wt% to 1.2 wt% and stirred until homogeneous. This dispersant, at an addition of only 0.01%, can reduce the average particle size of asphalt from 247.7 μm to below 100 μm; it can reduce oil sand adhesion by more than 30%. The dispersant of this invention has advantages such as low addition amount, high dispersion efficiency, excellent compatibility with drilling fluid systems, environmental friendliness, and simple preparation and application processes. It is suitable for controlling asphalt pollution during oil sand drilling and has broad engineering application prospects.

The present invention provides a powder containing fibrous carbon that can be easily dispersed and can impart electronic conductivity to electrodes and the like with only a small amount of additive. [Solution] A powder containing fibrous carbon having a structure in which cylindrical carbon hexagonal mesh surfaces are stacked in the direction of fiber thickness, wherein the average fiber diameter of the fibrous carbon is 110 nm to 300 nm, and when the powder is observed using a scanning electron microscope (SEM) at a magnification of 20,000 times, the average number of spherical carbon particles is 1 to 30, and the average maximum diameter of the spherical carbon particles is 0.30 μm or less.

The invention relates to polylactic acid carbon dots as well as a PLA / PVA (polylactic acid / polyvinyl alcohol)-based full-biodegradable polyester composite material and a preservative film thereof. The polylactic acid carbon dots are prepared by a microwave irradiation method, and the full-biodegradable polyester composite material takes PLA as a main base material, PVA as auxiliary resin, food-grade talcum powder as a filler, the polylactic acid carbon dots as a compatilizer, glycerol and stearic acid as lubricants and B215 as an antioxidant. Performing high-speed mixing and stirring to obtain a modified mixture, extruding and pelletizing the modified mixture to obtain a full-biodegradable polyester composite material, and performing film blowing on the polyester composite material to obtain the full-biodegradable preservative film. The polyester composite material prepared by the invention can be biodegraded under a matured compost condition (the test period is 140 days), the biodegradation rate is 91.79%, the relative biodegradation rate is 97.15%, the products are carbon dioxide and water, and inspection items such as the total migration amount and heavy metals meet standard requirements.

To provide a structure having a dense carbon film. [Solution] A structure comprising a conductive substrate and a carbon film on the surface of the conductive substrate, wherein the carbon film includes an aggregate of carbon nanoparticles, and the carbon nanoparticles are made of amorphous carbon.

The invention discloses a lithium iron phosphate positive electrode material as well as a preparation method and application thereof. The lithium iron phosphate positive electrode material comprises a lithium iron phosphate matrix (LFP) and a coating layer coated on the surface of the lithium iron phosphate matrix, wherein the coating layer contains aromatic polyamide and carbon. The lithium iron phosphate positive electrode material can improve the electrochemical performance of LFP at low temperature, and improve the low-temperature cycling stability and capacity retention ratio of the battery.

Carbon particles comprising at least 97 wt% carbon, based on the total weight of the carbon particle, at most 0.2 wt% impurities, based on the total weight of the carbon particle, at least 0.08 wt% boron, based on the total weight of the carbon particle, and at most 0.05 wt% boron carbide, based on the total weight of the carbon particle.

Provided is a carbon material containing carbon fibers having a structure in which cylindrical carbon hexagonal net surfaces are laminated in the fiber thickness direction, and having an average fiber diameter of 140 nm or more and an average fiber length of less than 5.0 μｍ.

The invention relates to the technical field of positive electrode materials, in particular to a coated modified phosphate positive electrode material as well as a preparation method and application thereof. The coated modified phosphate positive electrode material provided by the invention is of a double-coating-layer core-shell structure and comprises a phosphate positive electrode material core body, the first coating layer is arranged on the surface of the phosphate positive electrode material core body and comprises a first carbon layer formed by carbonizing thiophene substances and doped with sulfur and bromine elements; the second coating layer is arranged on the surface of the first coating layer, and the second coating layer is a second carbon layer formed by carbonizing a metal organic framework material. Through organic combination of the inner compact conductive carbon layer and the outer porous metal carbon skeleton, a three-dimensional mixed conductive network is constructed on the surfaces of lithium iron phosphate particles, and the electron conduction and ion diffusion processes are synchronously optimized, so that the comprehensive electrochemical performance of the material in high-rate charge and discharge and low-temperature environments is remarkably improved.

The application discloses an upper critical solution temperature responsive mesoporous silicon and a preparation method and application thereof, and is characterized in that: mesoporous silicon is coated on the outside of copper sulfide nanoparticles (CuS NPs), and then the coated CuS NPs are subjected to amination by using an APTES solution, and then a temperature-sensitive material PEG-p(AAm-co-AN) is grafted to form the upper critical solution temperature responsive mesoporous silicon. The application has the advantages of simple method, easy operation and mild reaction condition; the final product has good stability, can be used for loading a chemotherapeutic drug doxorubicin hydrochloride, and can realize drug controlled release; has temperature response drug release performance, and the phase transition temperature of the carrier is 43 DEG C, which is suitable for the microenvironment of tumor tissues; can be subjected to photothermal therapy under the irradiation of a 980nm laser, and realizes the synergistic effect of photothermal therapy and chemotherapy.

Provided are a nitrogen-doped cellulose-based carbon nano-carrier material, a preparation method therefor, and the use thereof. The preparation method comprises the following steps: (1) pretreating a nanocellulose sol to obtain a uniformly distributed nanocellulose solution; (2) freezing the nanocellulose solution and vacuum drying same to obtain a nanocellulose aerogel; (3) pre-carbonizing the nanocellulose aerogel in an inert atmosphere, and cooling same to obtain a nanocellulose carbon aerogel; and (4) placing the nanocellulose carbon aerogel in urea powder, and performing high-temperature vapor deposition in an inert atmosphere to obtain the nitrogen-doped nanocellulose-based carbon nano-carrier material. The selected raw materials of the carbon nano-carrier material in the method are plant fibers, and have strong mechanical strength, wide sources and low costs. The prepared nitrogen-doped cellulose-based carbon nano-carrier material has good surface wettability, excellent electrical conductivity and stable properties.

This invention provides a carbon material that has a high oxidation current of 4.1V and enables the fabrication of secondary batteries with excellent battery characteristics. [Solution] A carbon material containing fibrous carbon having a structure in which tubular carbon hexagonal mesh surfaces are stacked in the direction of fiber thickness, d 002 The wavelength is 0.3391 nm or less, and the BET specific surface area is 10.5 m². 2 / g or more 18.0m 2 A carbon material having a nitrogen adsorption test of the carbon material, where φ1 is the ratio of the cumulative pore volume up to a relative pressure of 0.00295 to the total pore volume (cumulative pore volume up to a relative pressure of 0.99), and φ2 is the ratio of the micropore volume (cumulative pore volume up to a relative pressure of 0.1537) to the total pore volume (cumulative pore volume up to a relative pressure of 0.99) using the BJH method with the Halsey formula, then φ2 / φ1 is 1.350 or greater.

Provided is a nanodiamond aqueous dispersion in which nanodiamond particles can be present in water in a highly dispersed state. The nanodiamond aqueous dispersion includes water and nanodiamond particles dispersed in the water. A content of heavy metal is 1 part by mass or less with respect to 100 parts by mass of the nanodiamond particles. A horizontal projection area of the nanodiamond particles calculated from an analysis image obtained by low-temperature electron microscopy satisfies at least one condition selected from the group consisting of (a) to (d): (a) a percentage of 100 nm2 or more is 20% or less, (b) a percentage of 80 nm2 or more is 24% or less, (c) a percentage of 50 nm2 or more is 30% or less, (d) a percentage of 30 nm2 or more is 39% or less.

The invention discloses a preparation method of a Cu-doped SiO2 / C hollow composite nanofiber lithium ion battery negative electrode material. The material is SiO2 / C coated Cu nanofiber. The Cu-doped SiO2 / C composite nanofiber is prepared by utilizing an electrostatic spinning technology and a high-temperature calcination process. The Cu element is doped into SiO2 / C in the form of Cu elementary substance particles, so that the electronic conductivity and the electrode electrochemical performance of the SiO2-based material are successfully improved. Under the current density of 100mA g <-1 >, the residual specific capacity after 100 cycles can reach 515.4 mAh g <-1 >.

The application discloses a method for preparing white-light carbon dots by using defatted Zanthoxylum bungeanum seeds and application thereof, and comprises the following steps: uniformly mixing the defatted Zanthoxylum bungeanum seeds in an organic solvent, and placing the mixture in a reaction kettle to react; cooling to room temperature after the reaction is completed, adding an amine compound, and again placing the mixture in the reaction kettle to react; after the reaction is completed, dialyzing the reacted solution by using a dialysis bag, and obtaining pure white-light fluorescent carbon dot powder after freeze-drying the dialyzed solution; the defatted Zanthoxylum bungeanum seeds are selected as a carbon source, a common fluorescent regulation mechanism is used to modify and optimize the structure, and a two-step method is used to directly synthesize a biomass derivative W1-CDs with excellent fluorescent characteristics.

This invention relates to a method for preparing medical nanozymes, the medical nanozymes themselves, their applications, and pharmaceuticals, belonging to the field of biomedicine. It addresses at least one of the following problems in existing technologies for treating deep tissue infections caused by drug-resistant bacteria: poor antibacterial and anti-biofilm effects, insufficient deep tissue penetration, lack of inflammation regulation and tissue repair functions, biosafety risks, and high material preparation costs. The preparation method includes: mixing rhodium trichloride, urea, and polyvinylpyrrolidone to obtain a mixture; subjecting the mixture to staged pyrolysis under inert gas protection to obtain a nitrogen-doped carbon-supported single-atom rhodium catalyst; and modifying the nitrogen-doped carbon-supported single-atom rhodium catalyst with polyethylene glycol. The medical nanozymes prepared by this invention achieve excellent antibacterial and anti-biofilm effects both in vivo and in vitro, can regulate the inflammatory microenvironment, promote tissue repair, exhibit good biocompatibility, and have strong tissue penetration ability.