319results about "Titanium carbide" patented technology

The invention discloses a method for preparing antioxidant MXene through electrochemical stripping, and belongs to the technical field of two-dimensional nano materials. Comprising the following steps: (1) centrifuging a Ti < 3 > C < 2 > T < x > MXene dispersion liquid to obtain a MXene wet solid, and coating the MXene wet solid on two sides of a copper foil; (2) the copper foil coated with the MXene wet solid serves as a cathode, and the cathode and the anode are placed in an electrolytic tank together; and (3) applying a constant voltage for electrolysis, collecting sediments in an electrolytic tank, centrifuging, washing, carrying out suction filtration, and drying to obtain the e-MXene film. The e-MXene prepared by the invention has excellent oxidation resistance and adjustable infrared emissivity, and can adapt to infrared camouflage application under damp and hot conditions.

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).

The invention relates to the field of nano materials and electrochemical technology materials, in particular to a melamino-formaldehyde / MXene composite material, a derived carbon material thereof, a preparation method and application. According to the preparation method disclosed by the invention, MXene is taken as a substrate, and protonated melamine formaldehyde molecules are inserted into MXene layers through an electrostatic self-assembly effect, so that the melamine formaldehyde / MXene composite material is synthesized; and carrying out high-temperature calcination on the basis to prepare the melamine formaldehyde / MXene composite material derived carbon material. According to the invention, active sites for adsorption and catalytic conversion of iodine species are provided while self-stacking of MXene is solved, and the melamine formaldehyde / MXene composite material is used as the positive electrode material of the aqueous zinc-iodine battery, so that the iodine species can be effectively anchored, and the active sites for catalytic conversion of iodine are fully provided; the reversibility and the structural stability of the electrode reaction are enhanced, so that the electrochemical performance of the battery is greatly improved.

The invention discloses a preparation method of an interlayer spacing adjustable MXene material through microwave-assisted chemical etching, and belongs to the technical field of two-dimensional nano material preparation. Key parameters such as etching agent solution concentration, villiaumite ratio and microwave power are adjusted and controlled through a synergistic effect mechanism of a microwave field and chemical etching; the preparation method realizes accurate and controllable interlayer spacing preparation of the MXene material, has the advantages of high reaction speed, high etching efficiency, accurate and adjustable interlayer spacing, wide range and the like, and provides an efficient and reliable preparation method for performance optimization of the MXene material in the fields of energy storage, catalysis, separation membranes, gas sensitivity and the like.

A paste that includes particles of a layered material in an ammonia aqueous solution. The particles include one or plural layers, the layers having a layer body represented by MmXn, wherein M is 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 not less than 1 and not more than 4, and m is more than n but not more than 5, and a modifier or terminal T exists on a surface of the layer body, wherein T is at least one selected from the group consisting of a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, and a hydrogen atom, wherein the paste has a viscosity of 1 Pa·s or more at a shear velocity of 1 / s when the paste has a solid content concentration of 1.0% by mass.

The application discloses a kind of high-conductivity MXene-based electromagnetic shielding composite films and preparation method thereof, belong to new material technical field.The preparation method includes the following steps: using in-situ HF etching method to prepare MXene dispersion liquid;With deionized water as solvent, silver nitrate solution is prepared by dissolving silver nitrate;The silver nitrate aqueous solution is added to MXene dispersion liquid, and Ag@MXene film is obtained by vacuum filtration method.The method uses silver ion in silver nitrate as oxidant to make it and titanium element in MXene occur redox reaction to generate silver particles, so as to prop up MXene sheet layer and reduce the resistance caused by adhesion between sheet layers and increase the conductive path in MXene, so as to increase the conductivity of MXene;The composite film not only has excellent conductivity, electromagnetic shielding performance and is easy to form processing;The conductivity of the composite film can reach 3120S / cm, and the electromagnetic shielding performance can reach 68.5dB.

The present invention discloses a negative electrode porous carbon material and a preparation method thereof, belonging to the technical field of negative electrode materials for sodium ion batteries. The carboxyl groups of acrylic acid react with the carboxyl groups of 2-hydroxyaniline, and the remaining hydroxyl groups combine with silanol groups generated by hydrolysis of 3-mercaptopropyltrimethoxysilane. Sulfonic acid-modified acrylic acid / aniline is obtained under the action of hydrogen peroxide. After calcination, sulfur- and nitrogen-doped conductive hollow carbon spheres are formed. Sulfur doping can participate in the formation of the SEI film, generate a stable interface layer, reduce electrolyte decomposition and irreversible consumption of active lithium, and improve the initial coulombic efficiency. Nitrogen doping can construct an electron high-speed channel and improve conductivity. The conductive hollow carbon spheres are coated with MXene nanosheets and deposited on the surface of foamed carbon. Through the three-level synergy of layered, hollow, and foamed forms, a rigid-flexible effect can be achieved while alleviating volume expansion.

A preparation method and application of a defect-ordered hexagonal pore structure antioxidant MXene material, comprising mixing hexagonal pore MAX phase Ti3AlC2 with CuCl2 and NaCl, loading into alumina corundum squares, and covering with a NaCl salt bed boat, placing the mixture in a muffle furnace, and sintering at a constant temperature of 820°C for 3 hours in an air atmosphere; after washing to remove impurities, the mixture is filtered, vacuum dried, and ground to obtain a defect-ordered hexagonal pore structure antioxidant. The advantages are: a simple and reasonable process, and under the joint action of trace amounts of metal oxides on the surface of the MXene material, an effective barrier against attacks by oxygen and water molecules is constructed, significantly improving the antioxidant properties of the MXene material.

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.

The invention provides a preparation method and application of an MXene material, and the preparation method comprises the following steps: 1) sintering a mixture comprising an M source, an A source, a nitrogen source and a carbon source to obtain a precursor Mn + 1AXn; (2) the precursor is subjected to etching treatment, the MXene material Mn + 1XnTx is obtained, the etching treatment time is 1-3 h, a solution for etching treatment comprises a hydrogen fluoride solution with the mass fraction being 10-40%, and the temperature is 25-60 DEG C; the MXene material obtained by the preparation method shows strong absorption characteristics in different frequency bands, and can better meet the requirements on wave-absorbing materials at the present stage.

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 application discloses an anti-oxidation method based on pH response type MXenes and application thereof, and belongs to the technical field of two-dimensional nanomaterials, and specifically comprises the following steps: in a MXenes suspension, only by adding a metal ion-polyphenol organic compound complex and controlling the pH value to be 3-6, the anti-oxidation capping of MXenes is realized. On this basis, when application is needed, the MXenes maintaining the intrinsic characteristics can be separated out by adding an alkaline solution to adjust the pH value to be not less than 7. The whole process has low cost, avoids the problem that a reducing agent is difficult to remove, has strong universality, and enables the intrinsic characteristics of MXenes to be maintained for more than 3 years.

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.

The present invention belongs to the field of nanomaterial technology, and provides a bimetallic chalcogenide composite material, and a preparation method and application thereof. The composite material of the present invention includes a two-dimensional layered carrier, and a first metal chalcogenide and a second metal chalcogenide loaded on the two-dimensional layered carrier; the two-dimensional layered carrier is a MXene material, and the MXene material is an M metallized carbon material; the first metal chalcogenide is MX2; the second metal chalcogenide is AX2; wherein M is a first metal, A is a second metal, and X is a chalcogen element. The present invention uses a two-dimensional layered carrier as a carrier to load the bimetallic chalcogenide, which can make the structure of the bimetallic chalcogenide complete; and the two-dimensional layered carrier can form a stable heterogeneous interface with the bimetallic chalcogenide, which is beneficial to the charge transfer between different components and the rapid storage of lithium ions, so that the composite material can be better applied to the field of lithium storage negative electrodes.

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 invention discloses CO detection equipment based on an unmanned aerial vehicle, a NiCo2O4 / Ti3C2MXene composite material contained in the CO detection equipment and a preparation method of the NiCo2O4 / Ti3C2MXene composite material, and belongs to the technical field of gas sensors. According to the invention, a novel NiCo2O4 / Ti3C2MXene heterostructure is developed through a hydrothermal synthesis method, the novel NiCo2O4 / Ti3C2MXene heterostructure is used for high-sensitivity carbon monoxide (CO) detection, the response to 100 ppm of CO at 110 DEG C reaches 139.5%, and the response time is 39 seconds. The performance improvement is derived from the synergistic effect between NiCo2O4 and MXene, the density functional theory (DFT) calculation reveals the reduction of CO adsorption energy, and the in-situ Raman spectrum directly observes the reversible CO chemical adsorption / desorption process at the heterogeneous interface. Then, the sensor is integrated on a miniature unmanned aerial vehicle platform, and drawing of a real-time three-dimensional gas distribution diagram is completed within 3 minutes.

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.

This invention provides a nano-silicon@SiO x This invention relates to the field of silicon cutting waste recycling technology, specifically the MXene composite anode material and its preparation method. The invention involves oxidizing silicon cutting waste to obtain nano-silicon@SiO₂. x Then, nano-silicon@SiO x When mixed with a pH buffer solution, negatively charged nano-silicon@SiO₂ is obtained. x The precursor was MAX etched to obtain MXene. MXene was mixed with a cationic surfactant solution to obtain positively charged MXene. Finally, negatively charged nano-silicon@SiO2 was added. x Positively charged MXene and pH buffer solution were mixed to obtain nano-silicon@SiO. x / MXene composite anode material. Nano-silicon@SiO2 prepared in this invention. x The MXene composite anode material overcomes the problems of volume expansion and poor conductivity of silicon materials during the charging and discharging process of lithium-ion batteries, and significantly improves the electrochemical performance of silicon-based anode materials.

The present disclosure describes electrochromic devices comprising transparent conductive layer acting as an electrode, an active electrochromic film, an ion conductor, and an ion storage film at least one of which comprises at least one MXene material.

To provide a hard material capable of reducing a burden of a user by achieving weight saving of an edge tool while maintaining sharpness as the edge tool peculiar to cemented carbide.SOLUTION: A hard material of the present invention includes: a first hard phase containing a compound of any one of a carbide, a nitride, and a carbonitride of W or Ti; a second hard phase containing a compound of any one of a carbide, a nitride, and a carbonitride of one element selected from the group consisting of Cr, Mo, V, Nb, Ta, Zr; and a binder phase containing Ni. A percentage of the binder phase is in a range of 20.0-50.0% in terms of wt.%.SELECTED DRAWING: None

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.

The invention discloses a preparation method of a carbon-based absorption type electromagnetic shielding material, which comprises the following steps: (1) pretreating green algae, and freeze-drying to obtain biomass aerogel with a three-dimensional porous structure; (2) placing the biomass aerogel in a sulfur source, performing carbonization and vulcanization reaction at high temperature to obtain vulcanized biomass aerogel, and forming sulfur-containing bonds on carbon fibers after vulcanization treatment; (3) etching the Ti3AlC2 precursor to obtain layered Ti3AlC2, and carrying out ultrasonic stripping to obtain a single-layer MXene dispersion liquid; (4) mixing the vulcanized biomass aerogel with the single-layer MXene dispersion liquid, dispersing the aerogel in the solution to form gel, and stacking the single-layer MXene outside the vulcanized carbon fiber under the action of electrostatic adsorption to form an MXene nanosheet packaging shell layer outside the carbon fiber; and (5) performing bidirectional freezing treatment on the reacted material, and performing freeze drying after the bidirectional freezing treatment to obtain the aerogel material with the directional pore channels.