147 results about "MXenes" patented technology

The invention discloses a method for preparing a composite iron-based polyanion positive electrode material. The structural formula of the positive electrode material is represented as Na4Fe3 (PO4) 2 (P2O7) (at) Camp, mXenes are sodium ferric pyrophosphate compositely coated by an MXenes material and a carbonaceous precursor, and the preparation method comprises the following steps: weighing a sodium source, a ferrous source, a phosphorus source and a carbon source according to a stoichiometric ratio, uniformly mixing, grinding, spray-drying and sintering at high temperature to obtain the composite iron-based polyanion positive electrode material, and the carbon source comprises iron-nickel doped polyethylene glycol. The composite iron-based polyanion positive electrode material provided by the invention is remarkably improved in the aspects of energy density, rate capability and cycle life, and the preparation process is simple to operate, reliable in flow, quick in preparation process and easy for industrial production, so that an ideal scheme is provided for commercialized sodium ion battery positive electrode materials.

The invention belongs to the technical field of material performance prediction, and discloses an MXenes material performance prediction method based on a graph neural network, and the method comprises the steps: obtaining the structural feature parameters of a to-be-predicted MXenes material; respectively matching node derivative information, edge derivative information and global derivative information based on the structural feature parameters; based on the node derivative information, the edge derivative information and the global derivative information, constructing an initial feature vector set, based on edge feature vectors and based on global feature vectors; and performing hierarchical processing on each feature vector in the initial feature vector set through each layer of the graph neural network to obtain the performance index of the to-be-predicted MXenes material target. According to the scheme, the key technical problems that in the prior art, geometric information coding is insufficient, and intra-layer and inter-layer interaction cannot be effectively distinguished are effectively solved.

The invention provides a phase-change composite aerogel material for photothermal conversion and high-density heat storage. The phase-change composite aerogel material takes MXene / CNTs modified aerogel as a three-dimensional porous continuous supporting framework and takes a phase-change material as a filling material; wherein the phase change composite aerogel material is prepared from the following components in percentage by mass: 3.0 to 4.4 percent of MXene / CNTs modified aerogel and 95.6 to 97.0 percent of a phase change material according to 100 percent of mass percent. The invention also provides a preparation method of the phase change composite aerogel material. The MXenes / CNTs modified aerogel composite phase change material prepared by the preparation method disclosed by the invention is in a micron level, MXenes and CNTs are attached to the surface and the interior of the MXenes / CNTs modified aerogel composite phase change material, and the MXenes / CNTs modified aerogel composite phase change material is large in heat transfer area, good in heat transfer performance and mechanical performance and wide in application range; the preparation method is simple, and the reaction time and reaction conditions are easy to control. The invention also provides application of the phase-change composite aerogel material in solar photothermal conversion and heat storage materials.

The invention discloses an abrasion-resistant coating for an ultra-deep oil and gas well as well as a preparation method and application thereof, and the preparation method comprises the following steps: modifying an MXenes phase nanosheet to obtain a modified MXenes phase nanosheet; loading a nano material with an abrasion interface repairing effect on the surfaces of the heterogeneous particles; the heterogeneous particles loaded with the nanometer material grow on the surface of the modified MXenes phase nanosheet in situ, and the heterogeneous-configuration MXene nanometer filler is obtained; and dispersing the heterogeneous-configuration MXene nanofiller in a coating matrix, adding a curing agent, and uniformly stirring to obtain the wear-resistant coating for the ultra-deep oil and gas well. Through the synergistic effect of the modified MXenes nanosheet, the heterogeneous particles and the nano material for repairing the abrasion interface, the technical problems that an existing coating is poor in abrasion resistance and responsiveness and difficult to uniformly coat a complex surface are solved.

There is disclosed a method of constructing a layered double hydroxide (LDH) material comprising selected metal ions, and employing metallic vanadium carbide (V2C) for promoting conductive properties of the LDH material, wherein the layered LDH material is a trimetallic LDH material. The trimetallic LDH material comprises selected Ni2+, Co2+, and A3+ metal ions with its cationic configuration for improving photocatalytic properties of the LDH material, wherein trimetallic nickel-cobalt-aluminium layered double hydroxide (NixCoyAlz LDH) and vanadium carbide MXene (V2C)-based composite is coupled with a graphitic carbon nitride (g-C3N4) nanosheet, to form a hybrid-junction photocatalyst. Also disclosed is a layered structure of vanadium carbide (V2C) MXenes, comprising trimetallic nickel-cobalt-aluminium layered double hydroxide (NixCoyAlz LDH) and vanadium carbide MXene (V2C) coupled with graphitic carbon nitride (g-C3N4), forming a NixCoyAlz LDH / g-C3N4 hybrid-junction photocatalyst.

The invention relates to the technical field of gas sensors, in particular to a sensing material based on nanoparticle loading, a preparation method of the sensing material and a gas sensor, and the sensing material comprises a substrate material and transition metal nanoparticles and / or precious metal alloy nanoparticles loaded on the surface of the substrate material; the substrate material comprises one or more of defect oxide, MOF, sulfide, carbide, MXene and phosphide. The semiconductor characteristic of the substrate material is combined with the hydrogen dissociation capability of the transition metal nanoparticles and / or the noble metal alloy nanoparticles, so that the adsorption and dissociation efficiency of hydrogen can be improved; by loading the nanoparticles on the substrate material, the interface hydrogen overflow process is regulated and controlled, the energy barrier of hydrogen overflow is reduced, and the sensitivity and response speed of the hydrogen sensor are further improved. By optimizing the interface structure between the nanoparticles and the substrate material, the process of interface hydrogen overflow is improved, and the hydrogen sensing performance is improved.

An optically active nanocomposite material is provided that may have a textured substrate and a multilayer optic stack with a plurality of layers comprising nanoplatelets. The nanoplatelets may be achiral and formed of a material such as transition metal chalcogenides, Mxenes, or nanocarbons. The optically active nanocomposite material displays both linear birefringence (LB) and linear dichroism (LD) and optional circular dichroism (CD). The nanocomposite may have an optical asymmetry g-factor of greater than or equal to about 1. Further, the nanocomposite is thermally stable, for example, to a temperature of greater than or equal to about 250° C. Different methods of fabricating such nanocomposites using layer-by-layer (LBL) processes are also provided.

The invention belongs to the field of lithium ion batteries, relates to a lithium ion battery electrode material, and particularly provides an MXene surface group modification method based on a NaOH / NaI molten salt system, which is used for realizing accurate regulation and control of MXene surface groups and modification of pure O groups and OH groups on the premise of not damaging an MXene structure. A NaOH / NaI molten salt system is adopted to modify an MXene surface group, an F group is replaced by an OH group to obtain OH group modified MXene, the OH group is further converted into an O group through high temperature, and pure O group modified MXene is obtained; moreover, the method is generally suitable for various MXenes, including single / double-metal MXenes, 21-phase MXenes, 32-phase MXenes, 43-phase MXenes and MXenes synthesized by other different methods; in addition, the method has the advantages of simple preparation process, low temperature, low cost and the like, and can be effectively applied to the fields of lithium ion batteries, supercapacitors and the like.

The invention relates to the technical field of wear-resistant anticorrosive coatings, in particular to a wear-resistant anticorrosive coating and a preparation method thereof. The composite material comprises the following components in parts by weight: 5-7 parts of modified nano titanium dioxide particles, 2-4 parts of MXenes, 2-4 parts of a metal organic framework, 85 parts of a resin material and 3-5 parts of an additive. The modified nano titanium dioxide particles, the MXenes and the metal organic framework are introduced, the organic silicon resin, the polyurethane resin, the epoxy resin or the fluoride polymer and the functional additive are combined, the problem that an existing anti-corrosion and wear-resistant coating is unreasonable in formula is solved, the basic performance of the coating is improved through compounding of the raw materials, and the service life of the anti-corrosion and wear-resistant coating is prolonged. And the coating is endowed with additional functions and has integration of multiple functions, so that the problem that the coating only has single performance is solved, and wider-range application, higher-level protection and performance improvement are provided for optical electronic devices. Meanwhile, the adopted method simplifies the preparation process and improves the production efficiency.

The present invention belongs to the field of electromagnetic wave absorbing materials, and specifically provides a multifunctional terahertz wave absorbing fabric based on MXenes materials and a preparation method thereof, aiming to solve the problems of narrow absorption bandwidth, single function, and easy oxidation existing in MXenes absorbing materials; based on the fiber microstructure in the matrix, combining the conductance loss and Ohmic loss of MXenes materials, waterborne polyurethane (WPU) is sprayed on the surface of the absorbing fabric for modification to realize a multifunctional terahertz absorbing material. The absorption efficiency can reach 100% under electromagnetic waves of 0.3 - 1.2 THz. At the same time, the water contact angle and rolling angle reach 151.3° and 0° respectively, with good self-cleaning performance, and the absorption performance of the fabric remains above 99% after self-cleaning. In addition, it has excellent acid and alkali resistance and environmental adaptability.

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 discloses a photo-thermal actuator based on MXenes, a photo-thermal variable device and application of the photo-thermal actuator and the photo-thermal variable device, and relates to the technical field of intelligent materials and devices. The photo-thermal actuator comprises a first film and a second film composed of a high-molecular polymer and an MXene material dispersed in the high-molecular polymer, the first film and the high-molecular polymer form a driving layer of the photo-thermal actuator, the MXene material forms an inert layer of the photo-thermal actuator, and the inert layer converts light energy into heat energy so that the driving layer can generate thermal expansion deformation; the photo-thermal variable device comprises a controller, a driving light source and a photo-thermal actuator, the photo-thermal actuator can be controlled through a flexible optical fiber, and various sensors or flexible circuits can be further integrated to achieve specific functions; the problems that an existing photo-thermal actuator is low in working efficiency and poor in reliability are solved, and on the basis of the photo-thermal actuator and the photo-thermal change device, the photo-thermal control flexible crawling robot, the intelligent mechanical clamp, the intelligent lighting system and other applications are provided.

The invention belongs to the field of medicines, and particularly relates to a nanosheet capable of activating an STING pathway and improving microwave ablation as well as a preparation method and application of the nanosheet. The nanosheet is prepared from MXenes through organic acid treatment, organic alkali dispersion, STING agonist compounding and phospholipid modification, and has good microwave thermal conversion efficiency and an STING pathway activation function. The combined microwave ablation can enhance the immunogenic death of tumor cells, promote the maturation of dendritic cells, doubly activate immune response and effectively inhibit the growth and metastasis of prostatic cancer, provides a new strategy for the treatment of prostatic cancer, and can be used for preparing drugs for treating prostatic cancer.

This disclosure provides an optically active nanocomposite material having a textured substrate and a multilayer optical stack comprising multiple nanosheets. The nanosheets may be chiral and composed of materials such as transition metal chalcogenides, MXenes, or nanocarbon. The optically active nanocomposite material exhibits linear birefringence (LB) and linear dichroism (LD), and optionally circular dichroism (CD). The nanocomposite material also exhibits optical asymmetry. g The factor may be greater than or equal to 1. Furthermore, the nanocomposite material exhibits thermal stability, for example, remaining stable at temperatures above or equal to about 250 °C. This disclosure also provides different methods for preparing such nanocomposite materials using a layer-by-layer self-assembly (LBL) process.

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 the technical field of energy storage materials, and discloses a supercapacitor and a preparation method and application thereof. The supercapacitor comprises a first electrode, a second electrode, a current collector and an electrolyte, the first electrode comprises a TiVC MXene film, and the electrolyte is an acidic electrolyte. In the prior art, research on MXenes for a supercapacitor is highly focused on Ti3C2, and exploration on other types of MXenes, especially key performance indexes (such as rate capability) of the MXenes is seriously insufficient. According to the invention, the huge potential of the double transition metal TiVC MXene as a high-performance supercapacitor electrode material is systematically proposed and verified for the first time, and the research system and the application range of the MXene material in the field of electrochemical energy storage are greatly enriched and expanded.

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 provides a Schottky heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysts. The preparation method of the Schottky heterojunction photocatalyst comprises the following steps: dispersing Ti3C2 nanosheets into water to obtain a dispersion liquid; and adding a Sn source and a sulfur source into the dispersion liquid, uniformly mixing, and reacting to obtain the Schottky heterojunction photocatalyst. C-SnS2 and MXenes are compounded to form a Schottky heterojunction photocatalyst, the Schottky heterojunction photocatalyst is coupled with PMS for activation, separation of charge carriers is promoted through the sub-metallic characteristic of MXenes, and PMS activation is promoted to generate a series of free radicals at the same time, so that the organic matter degradation capacity of a reaction system is enhanced.

The present invention discloses a sodium manganate material having a unique MXenes-like extended layer structure and a preparation method and application thereof. The present invention uses manganese dioxide nanotubes, first calcined to obtain a well-crystallized manganese dioxide powder with a hollow tubular structure, then ground it with a sodium salt that decomposes and generates gas, adds water to disperse ultrasound, and ultrasonically loads the manganese dioxide hollow nanotubes with sodium salt by ultrasound, and then calcines at high temperature in an oxygen atmosphere to promote the diffusion and release of carbon dioxide inside the manganese dioxide hollow tube to form a sodium manganate sodium ion battery positive electrode material that can be applied to the positive electrode of a sodium ion battery. The sodium manganate synthesized by the present invention, which is a MXenes-like extended layer structure, is conducive to the diffusion of sodium ions between layers, and has a high specific capacity and good cycle stability.

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.

An electrode, comprising: a portion of MXene, the portion of MXene optionally being free of materials other than the MXene; and (a) a sealing material, the sealing material at least partially enclosing the portion of MXene, and the sealing material defining an opening through which a sensing region of the portion of MXene is exposed; or (b) a substrate, the portion of MXene being disposed on the substrate. An electrode, comprising: a fiber; a first coating superposed on the fiber, the first coating having a thickness and comprising a MXene composition, the MXene composition optionally comprising aligned MXene flakes, the first coating optionally having a uniform thickness along the length of the fiber; and a second coating superposed on the fiber.

The application belongs to the technical field of nanometer layered materials, and particularly relates to a method for preparing MXenes material through electron beam irradiation; acid etching and electron beam irradiation are combined, MAX phase is etched at the same time, and the original closely stacked structure is modified into a sheet layer structure through electron beam irradiation. The MXenes material prepared through the method has high etching efficiency and controllability, the introduction of toxic F ion acid is avoided, the method is environment-friendly and simple to operate, and the obtained MXenes material has a dendritic layered structure.

The present application relates to the field of catalysts, more particularly, it relates to a kind of single-atom site catalyst and its preparation method.The preparation method of a kind of single-atom site catalyst includes: S1, preparation precursor;S2, preparation intermediate;S3, preparation single-atom site catalyst.The present application generates cation vacancy by doping heteroatom into transition metal compound loaded on MXenes using ionic liquid, so that the single-atom site catalyst prepared not only has more active sites, but also can effectively stabilize dense single atom, thereby improving catalytic performance.

Herein we demonstrate a method of high energy delamination called high pressure homogenization (HPH) that combines high shear, cavitation forces, and impact forces to delaminate MXene without any post-process refinement steps or chemical intercalants. HPH-delaminated MXene can be made at scale with high throughput and yield with virtually no waste. We demonstrate the viability of this process by fabricating free-standing films with the material for use as electrodes for energy storage, and as an effective antimicrobial coating with a two-log reduction in pathogenic microbes.

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 present invention discloses a manganese-based MXenes spin field effect transistor, comprising a substrate, a first electrode layer, a first isolation layer and a hydrogen atom passivated Mn2NO2 layer, wherein a second isolation layer and a third isolation layer, a second electrode layer and a third electrode layer are arranged on the hydrogen atom passivated Mn2NO2 layer. In addition, a method for using the manganese-based MXenes spin field effect transistor is provided, wherein a local electric field is applied to induce a partial area of ​​the hydrogen atom passivated Mn2NO2 to transform from a semiconductor to a semi-metal, thereby forming a semi-metal / semiconductor / semi-metal lateral heterojunction, wherein only a single material of hydrogen atom passivated Mn2NO2 is used, and a specific area is regulated to transform from a semiconductor to a semi-metal by adopting a local electric field to form a semi-metal / semiconductor lateral heterojunction, and each spin field effect transistor is magnetized by different external magnetic fields for writing information, and logic operations and magnetic storage are performed by detecting spin electron signals in each channel.

Methods for synthesizing tungsten-based MXenes without using a MAX phase precursor.

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 application discloses a kind of high stability two-dimensional nanometer material aerogel and preparation method thereof, it is related to material science and nanotechnology field.The water solution of two-dimensional nanometer material is frozen and handled to obtain frozen tissue, then foam structure is obtained by freeze drying, after which foam structure is soaked in ionic solution, freeze-dried, to obtain two-dimensional nanometer material aerogel.The application constructs two-dimensional nanometer material foam structure and introduces ionic bond crosslinking mechanism, so that two-dimensional nanometer material is combined by ionic bond to form high stability aerogel, so that aerogel has excellent performance.The application breaks through the selection limit of traditional aerogel material, and is suitable for ceramic two-dimensional material and MXenes with insufficient surface functional groups, lays a foundation for two-dimensional material aerogel large-scale production and application in the field of energy, aerospace and the like.

The invention belongs to the technical field of photothermal-photocatalytic synergistic materials, and particularly relates to a reduced graphene oxide-based nanocomposite as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, uniformly dispersing a graphene oxide dispersion liquid; s2, adding Ti < 3 > C < 2 > TX MXene, cobalt chloride hexahydrate and thioacetamide into the graphene oxide dispersion liquid to form a uniform reaction system; s3, carrying out hydrothermal reaction on the reaction system obtained in the step S2; s4, soaking and washing a product obtained after the hydrothermal reaction in the step S3; and S5, carrying out freeze drying on a product obtained after washing to obtain the reduced graphene oxide-based nano composite material. According to the preparation method disclosed by the invention, the reduced graphene oxide with more oxygen-containing functional groups reserved on the surface is obtained by utilizing the in-situ auto-oxidation reduction reaction between the graphene oxide and the Ti3C2TX MXene under the condition of not needing additional oxidizing agents and reducing agents, so that the composite material is endowed with good water transmission performance, and the high water evaporation rate is realized.