14 results about "Graphene nanoparticles" patented technology

The invention relates to the technical field of nanofluid enhanced heat transfer simulation, in particular to a molecular dynamics-based mixed nanofluid heat transfer characteristic analysis method, which comprises the following steps of: constructing a molecular model comprising copper, graphene nanoparticles and an ionic liquid / water mixed base solution, and calculating the heat transfer characteristic of the mixed nanofluid through a distribution potential function and a periodic boundary condition; and performing energy minimization and molecular dynamic relaxation to achieve thermodynamic equilibrium. A steady-state temperature gradient is established based on the unbalanced molecular dynamics principle, and the thermal conductivity is calculated according to the Fourier law. Microcosmic parameters such as a radial distribution function, mean square displacement and the number of hydrogen bonds are synchronously analyzed, and a coupling mechanism of interaction and heat transfer performance of the nano-particle-base fluid interface is disclosed. According to the method, the heat transfer characteristic of the mixed nanofluid can be clarified on the molecular scale, and an efficient and reliable analysis means is provided for nanofluid screening and design in application of a solar heat collector, a heat management system and the like.

Disclosed herein is a lubricant composition comprising a base oil or a fully formulated lubricant; and graphene nanoparticles derived from a carbon-containing gas dispersed in the base oil or the fully formulated lubricant.

Nanoparticles made of a metal oxide are heated to a temperature of from 70°C to less than 350°C. Graphene quantum dots are deposited on the surface of the nanoparticles made of a metal oxide by bringing a carbon-containing compound into contact with the nanoparticles made of a metal oxide while maintaining this heated state, thereby forming graphene-nanoparticle composites having the nanoparticles made of a metal oxide and graphene quantum dots deposited thereon.

The application discloses a preparation method of a carbonized wood-based electromagnetic shielding material with electrically-conductive and magnetically-conductive properties, which comprises the following steps: immersing Fe3O4@Graphene nanoparticles into the surface of wood after carbonization, and then performing chemical nickel plating to prepare the carbonized wood-based electromagnetic shielding material. The carbonized wood has good corrosion and insect prevention performance, is not easy to absorb water, and is a good moisture-proof wood with a contact angle of 126.2 degrees. Therefore, after the Fe3O4@Graphene nanoparticles are compounded on the surface of the carbonized wood, the chemical nickel plating can endow the carbonized wood with electromagnetic functional properties. By controlling the time for immersing the nanoparticles, the electromagnetic shielding performance of the carbonized wood composite material can be regulated. The conductivity of the carbonized wood composite material prepared after immersing the nanoparticles for 5 hours can reach 631.3 S / cm, and the average electromagnetic shielding efficiency of the carbonized wood composite material in a frequency range of 8.2 to 12.4 GHz can reach 70 dB, and some frequency bands can reach 80 dB.

The invention discloses a high elastic modulus alumina ceramic, and relates to the technical field of ceramics, the high elastic modulus alumina ceramic comprises a body material: 75 parts by mass of kaolin, 22.5 parts by mass of bentonite, 13 parts by mass of heavy magnesium carbonate, 2.5 parts by mass of calcium carbonate, and 120 parts by mass of alumina; glaze: 100 parts by mass of silicon dioxide, 22.5 parts by mass of potassium fluoroaluminate, 5 parts by mass of cerium dioxide, 6 parts by mass of yttrium oxide, 5 parts by mass of aluminum borate whiskers, 8 parts by mass of nano-zinc oxide, 3 parts by mass of cerium-graphene nanoparticles and 0.5 part by mass of large-ball mud superfine powder. According to the high-elasticity-modulus aluminum oxide ceramic, rare earth elements including cerium dioxide and yttrium oxide are beneficial to improving the toughness and high-temperature performance of the ceramic, and the strength and wear resistance of the ceramic can be enhanced by adding aluminum borate whiskers and nano-zinc oxide; due to the existence of the cerium-graphene nanoparticles, the electrical conductivity and thermal conductivity of the ceramic can be improved; the large-ball mud superfine powder is beneficial for improving the microstructure of the ceramic, so that the performance of the whole aluminum oxide ceramic is optimized.

The invention relates to the technical field of water treatment, in particular to a high-adaptability scale inhibition and dispersion agent and a preparation and use method thereof. The scale inhibition and dispersion agent is prepared from the following components in parts by weight: 31 to 47 parts of common seepweed herb, 26 to 38 parts of polyepoxysuccinic acid, 18 to 29 parts of hydrolytic polymaleic anhydride, 15 to 21 parts of sodium gluconate, 7 to 13 parts of graphene nanoparticles, 8 to 15 parts of nanoscale titanium dioxide and 20 to 30 parts of water. The scale inhibitor is specially used for a water treatment system with the concentration multiple being 2.5-3.5 and the chloride ion content being 600-1000 mg / L, can be used in cooperation with a conventional slow release agent, and provides excellent scale inhibition, dispersion and synergistic corrosion inhibition effects.

A method for obtaining a stable suspension of graphene oxide nanoparticles and carbon nanotubes. The method comprises: preparing graphene nanoparticles of size 70-150 nm, graphene oxide nanoparticles, in the process 0.7 g of potassium dichromate is added to 2 g of 96-98% sulfuric acid, 1 g of graphene nanoparticles is introduced, washed with water to a pH of 5.5; the graphene oxide nanoparticle suspension is dispersed in an ultrasonic disperser for 1 minute, 0.5 ml of ethanol is added to the carbon nanotubes, the resulting mixture is introduced into the graphene oxide nanoparticle suspension and dispersed for 5 minutes. In the method, the suspension contains graphene oxide nanoparticles at a concentration of 0.02 g / L or 0.03 g / L; the mixture containing 0.75 g of carbon nanotubes is introduced into the graphene oxide nanoparticle suspension at a concentration of 0.02 g / L, and the mixture containing 0.5-1 g of carbon nanotubes is introduced into the graphene oxide nanoparticle suspension at a concentration of 0.03 g / L.

The invention relates to the technical field of nano functional fluid materials, in particular to an ionic liquid-water mixed base graphene nano fluid and a preparation method thereof. The nanofluid comprises a mixed base solution formed by ionic liquid [EMIM] [BF4] and deionized water according to the mass ratio of 1: 9 to 4: 6, 1-3 layers of graphene nanoparticles with the mass fraction of 0.01-0.5% and PVP and / or an Arabic gum dispersing agent. The preparation method comprises the following steps: mixing and stirring the base solution; graphene and a dispersing agent are added for first stirring; and carrying out second stirring and probe type pulse ultrasonic treatment. Through the synergistic effect of the ionic liquid and the graphene, the obtained nanofluid shows remarkably improved heat conductivity coefficient and excellent antifriction and antiwear properties in a wide temperature range, is good in dispersion stability, and can effectively solve the problems of heat management and interface wear in ultra-precision cutting.

The invention discloses a protective coating for galvanization cathode protection iron materials. The protective coating comprises (45-65)% of polyfunctional group acrylic resin, (0.8-1.6)% of strontium chrome yellow nano mixed liquid, (0.02-0.05)% of graphene nano mixed liquid and (5-8.4)% of isocyanate curing agent, 7%-12% of cellulose resin, 6%-12% of silver powder, 5%-8% of solvent, 1%-3% of auxiliaries and the balance of diluent, wherein the content ratio of the polyfunctional group acrylic resin to the strontium chrome yellow nano mixed liquid to the graphene nano mixed liquid to the isocyanate curing agent is (45-65)%: (0.8-1.6)%: (0.02-0.05)%: (5-8.4)%. Strontium chrome yellow nanoparticles form anchoring points on the surface of an iron material, and meanwhile, the strontium chrome yellow nanoparticles are complexed with the polyfunctional group acrylic resin and the cellulose resin, so that the adhesive force of the coating to a zinc coating is enhanced to 10-12N / mm. The graphene nanosheets form a barrier for corrosive substances between the polyfunctional group acrylic resin and the cellulose resin, so that the corrosion resistance of the coating is enhanced. The protective coating disclosed by the invention is simple and convenient to construct, and provides excellent anti-corrosion and anti-aging capabilities for galvanized cathode protection iron materials.

The invention relates to the technical field of silicone rubber, and discloses heat-conducting silica gel and a preparation method and application thereof.The heat-conducting silica gel is prepared from methyl vinyl silicone rubber, hydroxyl silicone oil, a vulcanizing agent and aluminum oxide-graphene composite filler according to the mass ratio of 100: (0.8-1.3): (0.7-1): (30-60); the graphene nano particles and the alumina micro powder are tightly combined and are uniformly and tightly filled in gaps of the alumina large particles, so that the gaps and interface defects between the graphene nano particles and the alumina micro powder are reduced, a continuous heat conduction path is formed, and the heat conductivity and the heat conduction and heat dissipation performance of the silica gel are remarkably improved. The non-covalent modified graphene and the surface modified alumina have better dispersibility, and the compatibility with the silicone rubber is improved to a certain extent, so that the silica gel material keeps good mechanical properties.

The invention provides a graphene / copper foil reinforced automobile galvanized sheet welding processing method which comprises the following steps: carrying out surface treatment on a galvanized steel sheet to remove oil stains and impurities on the surface; the preparation method comprises the following steps: adding graphene nanoparticles into an acetone solution, uniformly stirring and then vibrating and dispersing to obtain reinforced phase paste; the reinforcing phase paste is evenly coated on the surface of a welding piece, drying treatment is carried out, and the welding piece is a copper foil; the dried welding piece is placed between two galvanized steel sheets subjected to surface treatment, U-MIG welding is conducted, natural cooling is conducted after welding is completed, U-MIG welding is a welding method that transverse ultrasonic vibration is applied through an ultrasonic generator in a traditional MIG welding process, and specifically, under the welding process, the welding piece is subjected to U-MIG welding; the graphene and the copper foil are used as reinforcing phases to improve welding defects of the galvanized steel sheet and microcosmic grains of a welding joint in the welding process, and the performance of the composite welding joint is further improved.

The present application relates to a kind of wool blended outdoor fabric and its preparation method, it relates to clothing fabric technical field, the fabric structure includes face cloth, bottom cloth and the graphene functional film being compounded between bottom cloth and face cloth;Wherein, the face cloth is polyester-wool blended knitted fabric, bottom cloth is polypropylene warp-knitted fabric;The graphene functional film is with polyurethane spinning solution as raw material, while being compounded core-spun yarn in centrifugal spinning and is made;The structure of the core-spun yarn includes with water-soluble fiber as core yarn layer and on the surface of core yarn layer intermittent polyurethane fiber is coated to form core layer, the surface of the polyurethane fiber is loaded with graphene nanoparticles, because wool fiber has hollow heat insulation function cooperates the windproof and warm-keeping of graphene functional film, far infrared heating makes fabric have excellent warm-keeping property, in addition, fabric also has stronger waterproof, breathable and moisture permeable and bacteriostatic property, so that it has good application prospect in outdoor clothing field.

A method for forming a graphene-reinforced polymer matrix composite is disclosed. The method includes distributing graphite microparticles into a molten thermoplastic polymer phase; and applying a succession of shear strain events to the molten polymer phase so that the molten polymer phase exfoliates the graphite successively with each event until at least 50% of the graphite is exfoliated to form a distribution in the molten polymer phase of single- and multi-layer graphene nanoparticles less than 50 nanometers thick along the c-axis direction.

Disclosed herein is a lubricant composition comprising a base oil or a fully formulated lubricant; and graphene nanoparticles derived from a carbon containing gas dispersed in the base oil or the fully formed lubricant.