192results about "Titanium carbide" patented technology

Ultrafast flash evaporation joule heating synthesis methods and systems, more particularly, ultrafast synthesis methods for recovering metals from ores, fly ash, and bauxite residue (red mud).

This invention belongs to the field of microwave absorbing material preparation technology, and discloses a two-step partial oxidation method to improve the microwave absorption performance of MXene materials. By performing hydrothermal pre-oxidation and heat treatment on MXene materials, oxide nanoparticles are grown in situ on their surface, achieving controllable partial oxidation. The MXene matrix retains a two-dimensional layered structure, and a heterogeneous interface is formed between the oxide nanoparticles and the MXene matrix. This adjusts the conductivity, optimizes impedance matching, enhances interface polarization, improves microwave absorption performance, and provides high-temperature stability.

Hybrid organic-inorganic MXenes (h-MXenes) having amido, imido, alkoxy, or aryloxy surface terminating groups and methods for synthesizing the hybrid organic-inorganic MXenes are provided. The synthesis of h-MXenes having a broad scope of erminal organic functional groups is carried out via the displacement of halide atoms from halide-terminated MXenes by deprotonated primary organic amines or deprotonated alcohols.

This invention belongs to the field of two-dimensional material preparation technology, and provides an MXene material and its preparation method. The preparation method of the MXene material includes: mixing a MAX phase precursor to be etched with an organic halide reagent and a morphology modifier, performing a solvothermal etching reaction, and after the reaction, washing and drying the resulting product to obtain the MXene material; wherein the organic halide reagent is triethylamine trihydrofluoride, triethylamine hydrochloride, or dichloroethylamine hydrochloride, and the morphology modifier is ethylene glycol, dimethyl sulfoxide, or cyclohexane. The method of this invention can effectively control the microstructure and pore structure of the MXene material.

The invention relates to preparation and application of a metal hydride serving as a lithium ion battery negative electrode material. The lithium ion battery negative electrode material is obtained by mixing Ti3C2 and MgH2 serving as raw materials and then carrying out dehydrogenation-hydrogenation treatment. Compared with the prior art, the lithium ion negative electrode material provided by the invention is simple in preparation method, and the obtained product is high in purity, uniform in size distribution and good in electrochemical performance, and can be further applied to the fields of battery materials, supercapacitors and the like.

A powder 1a contains layered materials 1k. The layered materials 1k each comprise a layer 10. The layer 10 includes a body 11 and a terminus 12. The body 11 has the composition MmXn. The terminus 12 is present on the surface of the body 11. In the body 11, M is at least one selected from the group consisting of Group 3 elements, Group 4 elements, Group 5 elements, Group 6 elements, and Group 7 elements. X includes at least one selected from the group consisting of carbon atoms and nitrogen atoms. n is 1-4. m is higher than n but not higher than 5. The median diameter D50 in the volume-based particle diameter distribution of the powder 1a is 10 μm or smaller.

A two-dimensional particle that includes: one or plural layers that comprise a layer body represented by: MmXn, wherein Mis at least one metal of Group 3, 4, 5, 6, or 7; X is a carbon atom, a nitrogen atom, or a combination thereof; n is 1 to 4; and m is more than n but not more than 5, a modifier or terminal T exists on a surface of the layer body, wherein T is at least one selected from a hydroxyl group, a fluorine atom, a chlorine atom, an iodine atom, an oxygen atom, a chlorine atom, a phosphorus atom, and a hydrogen atom; and a hydrocarbon compound exists on the one or plural layers.

The application discloses a sodium ion battery positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) metal salts are weighed according to the molar ratio of each metal element in a layered oxide positive electrode material of a sodium ion battery, and first mixed powder is obtained after being uniformly mixed; MXene material is uniformly mixed with sodium hydroxide to obtain second mixed powder; (2) the first mixed powder and the second mixed powder are stacked in an alternating stacking mode, wherein the bottom layer and the top layer are both second mixed powder layers, and the sodium ion battery positive electrode material is obtained through calcination treatment. In the application, MXene is used as a modifier to perform doping and coating modification treatment on the layered oxide positive electrode material, some metal atoms in the MXene enter the positive electrode material to play a doping role after etching of the MXene by sodium hydroxide, and the MXene which is not etched is coated on the surface of the layered oxide positive electrode material, so that the sodium ion positive electrode material with high conductivity and structural stability is obtained.

The invention discloses a method for growing titanic acid / titanium dioxide nanoparticles on a titanium carbide Mxene sheet layer, and relates to a method for growing titanic acid / titanium dioxide nanoparticles on the surface of a titanium carbide Mxene sheet layer structure. The method comprises the following steps: firstly, etching titanium aluminum carbide at room temperature by adopting hydrofluoric acid to obtain a layered titanium carbide Mxene material, then dispersing the layered titanium carbide Mxene material in hydrogen peroxide with the mass percent concentration of 20-30%, simultaneously adding 0.6 ml of 65% nitric acid, and reacting for 24-72 hours at the temperature of 20-80 DEG C, so that titanic acid nanoparticles can grow on the surface of a titanium carbide Mxene lamellar structure; and subsequently carrying out heat treatment in an air atmosphere at 200-500 DEG C, and converting the titanic acid into anatase titanium dioxide. The preparation temperature is low without high pressure; the nanoparticles keep a lamellar structure aggregation state, and are expected to be applied to the fields of adsorption, photocatalysis and the like.

The application belongs to the technical field of two-dimensional materials, and relates to a method for preparing two-dimensional MXene materials through high-energy electric shock fluorinated salt etching in seconds, which comprises the following steps: 1) after grinding and mixing of a parent phase MAX powder and a fluorinated salt, the mixture is loaded into a quartz tube of a high-energy electric shock device, graphite electrodes are inserted into two ends of the quartz tube, and the material is compacted to be in close contact with the electrodes; 2) after completion of capacitor charging of the high-energy electric shock device, a discharge button is opened, high-energy electric shock is performed, the reaction is completed after flash phenomenon occurs, fluorinated salt is supplemented, and electric shock is repeated for 2-3 times; 3) the product after electric shock is ground and washed with acid, and after washing with deionized water until neutral, standing or centrifugal layering is performed, and the MXene two-dimensional material is obtained from the upper layer. Through high-energy electric shock, the reaction is completed in an instant, the comprehensive energy consumption is lower, and the etching efficiency is faster, and due to fast reaction time, high-temperature oxidation of the MXene can be effectively inhibited, and the application prospect is better.

The invention relates to the technical field of electrochemical energy storage materials, in particular to a few-layer Ti3C2 heterostructure constructed by a bifunctional molecular bridge technology as well as a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing 11-aminoundecanoic acid (AUAm), (NH4) 6Mo7O24. 4H2O, a few-layer transition metal carbide solution (FLM) and CH4N2S with water, and carrying out hydrothermal reaction to obtain a few-layer Ti3C2 heterostructure material. The molecular bridge designed by the invention has a bifunctional characteristic, the-NH2 group of the molecular bridge can be inserted between MoS2 layers to expand the interlayer spacing, the-COOH group of the molecular bridge and-OH on the surface of FLM form a covalent bond, the in-situ growth of intercalated MoS2 on few-layer metal carbide is realized, the construction of an FLM / AUAm / MoS2 heterostructure is promoted, and the material designed by the technology can be used as a supercapacitor electrode material and has a wide application prospect. The excellent electrochemical performance is shown.

The application belongs to the technical field of microwave absorption, and relates to a wave-absorbing material capable of being inkjet printed and a preparation method thereof. The wave-absorbing material capable of being inkjet printed comprises MXene nanosheets, two-dimensional inorganic nanosheets, water and ethanol, wherein the mass ratio of the two-dimensional inorganic nanosheets / MXene nanosheets is 1-40%, and the volume ratio of the water / ethanol is 0.2-0.8. The preparation method of the wave-absorbing material comprises the following steps: MXene nanosheets are prepared by placing MXene precursor powder in a mixed solution of concentrated hydrochloric acid and lithium fluoride powder for etching; two-dimensional inorganic nanosheets are prepared by mixing layered oxide ceramic powder with acid solution for ion exchange and then carrying out intercalation reaction; and MXene / two-dimensional inorganic composite nanosheet ink is obtained by uniformly dispersing the two kinds of nanosheets in a water / ethanol mixed solvent. The preparation method has low cost, is simple and convenient to operate, and is environmentally friendly, and can realize large-scale production. The prepared wave-absorbing material has good stability, can be integrated on the surface of various rigid and flexible electronic devices in the form of inkjet printing, and can effectively reduce electromagnetic wave pollution.

In one general approach, a method for fabricating a MXene includes etching a MAX phase for selectively removing an A group element from the MAX phase, thereby forming a multilayer MXene. The multilayer MXene is then intercalated and exfoliated. In another general approach, a method for fabricating a MXene includes contacting a MAX phase with an acid and a fluorophosphate salt in a nonaqueous solvent for selectively removing an A group element from the MAX phase, thereby forming a multilayer MXene. The multilayer MXene is then intercalated and exfoliated.

The invention relates to a preparation method of a highly ordered, soft and malleable MXene-based organic-inorganic hybrid superlattice material, which comprises the following steps: carrying out surface modification on hydrochloric acid acidified Ti3C2Tx nanosheet aqueous dispersion by using oleylamine, washing the product with ethanol, drying, and dispersing in trichloromethane; and adding small molecular ligands such as oleic acid into the dispersion liquid, and then carrying out solvent evaporation assembly to obtain the superlattice material with a long-range ordered layered structure. The film shows intrinsic flexibility and can be directly formed into a macroscopic three-dimensional block through physical folding and mold pressing. The mechanical property of the MXene material is fundamentally regulated and controlled through molecular intercalation and ordered assembly, integrated construction from a nanoscale ordered structure to a macroscopic functional material is achieved, and the obtained MXene-based organic-inorganic hybrid superlattice material has electrical conductivity, structural orderliness and good deformability; the method has important application prospects in the fields of flexible electronic devices, deformable electrodes, intelligent sensing and the like.

The invention discloses a Ti < 3 > C < 2 > T < x > MXene-GQD nano composite material as well as a preparation method and application thereof, and relates to the technical field of composite material preparation. The method comprises the following steps: dissolving LiF in a hydrochloric acid solution, and adding Ti3AlC2 powder to prepare a colloidal solution; the preparation method comprises the following steps: dissolving citric acid in deionized water, and then carrying out hydrothermal carbonization to prepare a GQD solution; and mixing the colloidal solution and the GQD solution, and stirring to obtain the nano composite material. According to the invention, the Ti3C2Tx MXene two-dimensional lamellar structure is utilized to stabilize the GQD nanoparticles, so that the GQD nanoparticles are uniformly dispersed and are not easy to agglomerate, and the long-term uniformity is ensured; by utilizing the photothermal effect of Ti3C2Tx MXene and the photodynamic effect of GQD, the dual photoresponse antibacterial efficiency is realized, the infection of drug-resistant bacteria can be efficiently inhibited, a non-antibiotic way is provided for treating the drug-resistant bacteria, and the infection problem and the related postoperative pain problem are effectively controlled in practice.

This invention provides a method for preparing nano-sized magnesium hydride, comprising the steps of preparing magnesium nanoparticles by gas-phase condensation, MXene-confined catalytic hydrogenation, and atomic layer deposition to construct a composite coating layer. This invention achieves the preparation of ultrafine magnesium nanoparticles through gas-phase condensation; simultaneously utilizing the three-dimensional wrinkled structure Ti3C2T x MXene not only effectively prevents the migration and aggregation of nanoparticles during cycling through physical confinement, but also lowers the energy barrier of hydrogen adsorption and desorption reactions through in-situ generated highly active catalytic phases (such as TiH2), achieving a dual synergistic effect of confinement and catalysis. A titanium dioxide-amorphous carbon composite coating layer is constructed using atomic layer deposition (ALD) technology, which, in conjunction with the MXene confinement framework, provides a dual stabilization mechanism for nano-magnesium hydride. This invention organically combines gas-phase condensation, MXene-confined hydrogenation, and ALD coating, resulting in a product with an initial dehydrogenation temperature below 100°C and a hydrogen storage capacity retention rate exceeding 95% after 3000 hydrogen adsorption and desorption cycles, demonstrating excellent comprehensive performance.

The application discloses graphene-MXene composite aerogel as well as a preparation method and application thereof. The preparation method of the graphene-MXene composite aerogel comprises the following steps: 1) preparing an oxidized graphene-MXene water dispersion; 2) preparing an oxidized graphene-MXene frozen block; 3) preparing an oxidized graphene-MXene composite aerogel; and 4) annealing the oxidized graphene-MXene composite aerogel. The graphene-MXene composite aerogel has a multi-layer gradient structure, excellent compression resilience, dynamic infrared stealth and wide-band microwave absorption dual functions, and the preparation method is simple, so that the graphene-MXene composite aerogel can be widely applied in the fields of electronic communication, aerospace and the like.

This invention relates to a method for preparing an independently supported MXenes hydrogel film, comprising the following steps: forming a wet film by vacuum filtration of an MXenes suspension; immersing a filter paper containing the wet film entirely in an acid solution, utilizing hydrated hydrogen ions to induce interlayer confined crosslinking to form a gel structure, and then separating it from the filter paper; and washing the resulting gel film with deionized water until the pH value is close to neutral to obtain an independently supported MXenes hydrogel film. This method does not require the introduction of polymers or second-phase materials, retains the intrinsic conductive network of MXenes, and the resulting gel film possesses a three-dimensional porous structure, excellent mechanical stability and conductivity, making it suitable for applications such as aqueous energy storage, electromagnetic shielding, and flexible electronic devices. It has the advantages of a green process, controllable structure, and suitability for large-scale preparation.

The application belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a MXene two-dimensional material, a graphite negative electrode material and a preparation method of the MXene two-dimensional material, the preparation method of the MXene two-dimensional material being as follows: lithium sulfate solution is added into a MXene dispersion liquid, stirred uniformly, vacuum dried, calcined at 300-500 DEG C, and the MXene two-dimensional material is obtained; and the application can effectively improve lithium ion conductivity and improve the performance of a battery.

This invention provides a rapid and energy-efficient pretreatment method for recovering rare earth elements (REEs) from ore, fly ash, and bauxite residue (red clay). [Solution] The present invention relates to an ultrafast flash Joule heating synthesis method, and more specifically, embodiments of the present invention include an ultrafast synthesis method for recovering metals from ore, fly ash, and bauxite residue (red clay).

The application discloses a titanium-based MXenes recycling and regenerating method, and the method comprises the following steps: (1) adding failed MXenes into an alkali solution to form an A solution; (2) hydrothermally treating the A solution at a specific temperature for a certain time; (3) centrifuging the solution after reaction to collect, and adding an acid solution into the collected sludge to form a B solution; and (4) stirring the B solution under ambient conditions for a certain time, and then centrifugally washing and collecting the solution by using deionized water to obtain regenerated MXenes. The application removes failed titanium-based MXenes derived oxide nanoparticles through alkali hydrothermal treatment and subsequent acid etching, and realizes MXenes recycling and regeneration. The strategy utilizes cheap and environment-friendly alkali and acid for step-by-step etching, and has the advantages of simple operation, environmental friendliness, low cost and easy industrialization scale application.

The invention discloses an aqueous zinc ion battery negative electrode, a preparation method thereof and an aqueous zinc ion battery, and belongs to the technical field of energy storage materials. According to the invention, the aqueous zinc ion battery negative electrode material is prepared by coating the surface of a zinc foil with a porous N-Ti3C2Tx nano material; the preparation method of the porous N-Ti3C2Tx nano material comprises the following steps: uniformly mixing a Ti3C2Tx suspension and a melamino-formaldehyde ball dispersion liquid, and carrying out electrostatic adsorption reaction to obtain a mixture; and under the inert gas atmosphere, the mixture is subjected to annealing treatment at the temperature of 500-550 DEG C, and the porous N-Ti3C2Tx nano material is obtained. The porous N-Ti3C2Tx nano material is utilized to effectively improve the problems of uncontrollable growth of zinc dendrites, volume expansion and structure pulverization, hydrogen evolution and corrosion side reaction, slow interface dynamics and poor compatibility of the material and electrolyte in the zinc battery.

The application provides a two-dimensional nanosheet film material, a preparation method thereof, a permeation energy power generation film material and an application thereof. The preparation method comprises the following steps: preparing an intermediate film material by suction filtration through two-dimensional nanosheets, and performing plasma treatment on the intermediate film material to obtain the two-dimensional nanosheet film material; wherein the ionized gas used in the plasma treatment comprises at least one of air, oxygen and carbon tetrafluoride; in the plasma treatment, the flow rate of the ionized gas is 0.5-30 slm, and the ionization power is 10-500 W. The application further provides the two-dimensional nanosheet film material obtained by the above preparation method, a permeation energy power generation film material comprising the two-dimensional nanosheet film material or prepared from the two-dimensional nanosheet film material, and an application of the permeation energy power generation film material. The above preparation method is simple in process, safe and reliable, and high in operability; the two-dimensional film material prepared has high output power, and has wide industrial application prospect.

The invention discloses a one-dimensional non-Van der Waals superlattice material, a preparation method thereof, a thin film, a preparation system and application in electromagnetic shielding. The non-van der Waals superlattice is formed by periodically stacking MXene atomic layers through a stiffness-mediated curling strategy, and strong electron coupling is formed between the layers through hydrogen bonds. The superlattice material has Moire periodicity, shows ultrahigh conductivity, and meanwhile has high charge carrier concentration and unique positive linear magnetoresistance characteristics. When the thin film is applied to electromagnetic interference shielding, the thin film can achieve shielding effectiveness exceeding 124dB. According to the method, metal vacancies are created in the MXene material to customize the bending rigidity, rapid and ordered curling is achieved through a specific stripping agent, and various non-Van der Waals superlattices including V, Ti, Nb and Ta-based carbides and carbonitride are successfully prepared. The method is high in yield and good in reproducibility, and a brand new material platform is provided for developing high-performance electronic and electromagnetic shielding and energy devices.

The application relates to the material field and provides a layered Ti3C2T x / MXene loaded FeCo nanoparticle composite material, a preparation method and application, FeCo nanoparticles prepared by a hydrothermal method and Ti3C2T x / MXene are combined by an electrostatic self-assembly method, so that a layered composite material is obtained, FeCo nanoparticles with soft magnetic properties are loaded between layers and on the surface of the Ti3C2T x / MXene material, and the FeCo nanoparticles can adjust the dielectric property of the composite material, so that the composite material can be widely applied in the wave absorption field. The application has the advantages of simple equipment, low production cost, high production efficiency and green pollution-free. The composite material is a high-reflection and low-absorption material in a 170-220 GHz frequency band, and the absorption rate is 10-30%. In a 0.2-3 THz range, the product prepared by the method also has a wave absorption effect, and the absorption coefficient is 100-150 cm ‑1 .

The invention relates to a method for preparing MXenes porous powder based on covalent bond crosslinking. The method comprises the following steps: mixing graphene oxide (GO) dispersion liquid and MXenes dispersion liquid to form mixed dispersion liquid; adding sodium chloride to form a mixed system; the mixed system is dried, sodium chloride is crystallized and separated out, and an M-O-C covalent bond cross-linked structure is formed through a condensation reaction between hydroxyl on the surface of MXenes and hydroxyl on the surface of graphene oxide in the drying process; and crushing the obtained composite block, washing with water to remove the sodium chloride template, and drying to obtain the MXenes porous powder. According to the method, a stable three-dimensional porous structure is constructed under the water system condition by utilizing the synergistic effect of salt template space separation and in-situ covalent cross-linking, and the method is simple in process and suitable for large-scale preparation.

The invention discloses a NiCo-C-C / MXene composite material with excellent electromagnetic wave absorption performance and a preparation method of the NiCo-C-C / MXene composite material. According to the material, a multi-component heterogeneous interface engineering strategy is provided, a Prussian blue analogue precursor is coated with polydopamine, MXene is combined, and the NiCo (at) C (at) C / MXene composite material with a layered structure is prepared through high-temperature pyrolysis. Aiming at the problems of organic ligand loss, low carbon content, easy structure collapse, insufficient mechanical strength and conductivity and the like of the traditional PBA derivative material, the method effectively inhibits structural damage at high temperature by introducing a PDA shell layer rich in carbon sources, and meanwhile, a stable conductive network is constructed by utilizing the excellent conductivity of MXene. According to the finally prepared composite material, abundant heterogeneous interfaces and defect sites are constructed among the NiCo nanoparticles, the mixed crystallinity carbon matrix and the MXene layer, and the impedance matching and attenuation capabilities are remarkably optimized through the synergistic effect of interface polarization loss and multiple loss mechanisms.

The invention relates to the technical field of composite carbon materials, in particular to a metal carbide modified carbon material and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: mixing a carbon material with a modification element precursor to obtain mixed powder; and calcining the mixed powder in a protective atmosphere or a vacuum environment to obtain the metal carbide modified carbon material, the modification elements in the modification element precursor comprise one or more of scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, yttrium, zirconium, niobium, molybdenum, technetium, ruthenium, rhodium, palladium, hafnium, tantalum, tungsten, iridium and rhenium; the carbon material is an unmodified carbon material or a three-dimensional structure graphene modified carbon material. According to the preparation method, the coupling and adhesion capacity between the metal carbide and the carbon material can be remarkably improved, so that the carbon material has excellent structural stability, and the carbon material is applied to the fields of thermal management materials, high-strength and high-conductivity metal-based composite materials, high-conductivity and high-thermal-conductivity resin-based composite materials and polishing agent abrasives.

The invention provides an interface buffer material, a secondary battery and an electric device, and relates to the technical field of electrochemical energy storage materials. The interface buffer material disclosed by the invention comprises Ti < 3 > C < 2 > T < x > MXene and an inorganic ceramic layer coated on the surface of the Ti < 3 > C < 2 > T < x > MXene, the inorganic ceramic layer includes an oxysalt layer and a non-oxide layer. When the interface buffer material is applied to the solid-state battery, the cycling stability of the solid-state battery can be improved, and the interface impedance of the solid-state battery can be reduced.

The application relates to a preparation method of a gradient titanium-based boron-doped diamond thin film electrode and belongs to the technical field of electrode materials. Ti / TiO2 nanotube gradient substrates are obtained by in-situ preparation of TiO2 nanotubes through anodic oxidation of a metal titanium substrate; the Ti / TiO2 nanotube gradient substrates are embedded into carbon powder, high-temperature carbonization treatment is carried out under a protective atmosphere to obtain Ti / TiC nanotube gradient substrates; a boron-doped diamond thin film is deposited onto the surface of the Ti / TiC nanotube gradient substrates by using a chemical vapor deposition method to obtain the gradient titanium-based boron-doped diamond thin film electrode. The TiC nanotubes are synthesized on the titanium substrate in-situ and in advance, the generation of uneven TiC and TiH2 phases in the conventional chemical vapor deposition process can be avoided, an embedded structure is formed between the TiC phase gradient layer and diamond particles, the poor bonding force problem caused by the thermal expansion coefficients and lattice mismatches of various phases is reduced, and the service life of the titanium-based boron-doped diamond thin film electrode is significantly improved.