123 results about "MXenes" patented technology

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 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 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 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 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.

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.

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.

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.

This invention discloses a two-dimensional layered ammonia oxidation catalyst based on MXene, its preparation method, and its application in low-temperature ammonia fuel cells. The catalyst comprises an active component and a support. The active component is one or two of the transition metals Pt, Ir, and Pd, and the support is accordion-shaped MXenes. The catalyst support prepared by this invention has a large specific surface area, in which the transition metal nanoparticles are uniformly dispersed and have strong interactions with the MXenes, which can significantly improve its ammonia electrocatalytic oxidation activity, showing good application prospects in ammonia fuel cells.

The invention relates to application of a CoFe-PBA-coated MXenes nano confinement catalytic membrane, the CoFe-PBA-coated MXenes nano confinement catalytic membrane is combined with peroxymonosulfate to treat a polluted water body, and a pollutant of the polluted water body is bisphenol A. The CoFe-PBA-coated MXenes nano confinement catalytic membrane has the advantages that the CoFe-PBA-coated MXenes nano confinement catalytic membrane can be used for treating the polluted water body; according to the method disclosed by the invention, the bisphenol A in the water is removed by activating the peroxymonosulfate by using the CoFe-PBA-coated MXenes nano confinement catalytic membrane, and the method has the advantages of simplicity in operation, small secondary pollution and high removal rate.

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 present invention provides a method for electrochemically detecting tetrodotoxin based on Ag@copper oxide nanoparticles, belonging to the technical field of electrochemical analysis. The present invention is based on AgNPs, and a Cu2O shell is grown around it to synthesize Ag@Cu2ONPs. The prepared Ag@Cu2ONPs have two stable electrochemical signals, at -0.13V and 0.17V respectively. The Ag@Cu2ONPs modified with nucleic acid aptamers are incubated with the substrate material (MXenes NSs) to form an assembly. When tetrodotoxin is present, the Ag@Cu2ONPs are detached from the substrate material, resulting in the weakening of the two electrochemical signals. Both signals of the electrochemical sensor linearly increase with the increase of the logarithm of the concentration of tetrodotoxin, realizing sensitive and accurate detection of tetrodotoxin.

This invention discloses a highly efficient method for activating peroxymonosulfate (PMS) to degrade ofloxacin. The method is characterized by employing a degradation catalytic material based on an Mxenes support, containing both Mn and N active sites, to activate PMS. The synergistic effect of the combined catalytic action of the Mn and N active sites enhances the activation efficiency of PMS, thereby achieving the degradation of ofloxacin in water. This invention reduces metal leaching, improves degradation stability, and increases the efficiency of PMS-activated ofloxacin degradation during the ofloxacin degradation process. It also boasts advantages such as simple material preparation, low cost, convenient implementation, good catalytic degradation effect on pollutants, convenient recovery, and no secondary pollution.

This invention discloses a method for preparing bimetallic MXene modified by transition metal ions, which prepares different metal ions (Co) through electrostatic interactions. 2+ Ni 2+ and Mn 2+ ) and Mo2TiC2T intercalated with different concentrations x Material (labeled as Mo2TiC2T) x The study investigated the feasibility of modifying MXene materials by performing detailed characterization and analysis on the prepared samples. Analysis of the phase and morphology of the prepared samples revealed that transition metal ion intercalation of Mo2TiC2T... x The structure becomes more porous, significantly increasing its interlayer spacing. The introduction of metal ions can form new metallic bonds, facilitating efficient electron transfer. Electrochemical performance studies revealed that metal-ion-intercalated bimetallic MXenes exhibit excellent electrocatalytic hydrogen evolution performance and good stability.

The present invention provides an integrated electrode-based photoelectric biosensor and its preparation method, addressing the technical issues of prior art photoelectric biosensors, such as cumbersome assembly and operation, and low sensitivity in detecting protein kinase activity. The preparation method comprises the following steps: S1. preparing a kemptide-modified integrated printed electrode; S2. dripping a buffer solution containing protein kinase and ATP onto the electrode for reaction, then dripping an Au@MXenes / BiOCl probe solution onto the electrode. After the reaction is complete, the photoelectric biosensor is prepared. Under visible light excitation, the Au in the Au@MXenes / BiOCl probe generates free electrons due to localized plasma. Simultaneously, the MXenes and BiOCl semiconductors synergistically generate photoexcited electrons. These two electrons jointly transition to the electrode surface, generating a photocurrent. This further increases the current generated by the probe under visible light, effectively improving the sensitivity and linear range of detection. The sensor can be widely used in photoelectric sensing and biochemical analysis.

MXenes are nanostructures with unique characteristics for bioanalytical applications, such as hydrophilicity, large surface area, strong metallic conductivity, strong ion transport capabilities, biocompatibility, minimal diffusion barrier, and easy functionalization. These materials are formed of transition metallic nitrides, carbides, or carbonitrides. This invention is the innovative of using MXenes in electrochemical and optical biosensors, identifying future requirements and potential in this sector, particularly in the development of wearable sensors and platforms with integrated biomolecule detection.

The invention relates to the field of solid electrolyte, in particular to composite solid electrolyte as well as a preparation method and application thereof. The composite solid electrolyte is characterized by being prepared from the following components in percentage by mass: 30 to 40 percent of lithium thiophosphate, 5 to 15 percent of Ti < 3 > C < 2 > T < x > MXenes, 5 to 7 percent of polyoxyethylene, 3 to 5 percent of nano aluminum oxide, 5 percent of a carbonate plasticizer and 40 percent of N, N-dimethylformamide. The room-temperature ionic conductivity of the composite solid electrolyte provided by the invention reaches 1 * 10 <-1 > S / cm, which is superior to that of the traditional Li3PS4 electrolyte. A cycle life gt; 3000 times (the capacity retention rate gt; and no dendritic crystal is generated. And the air stability is obviously improved (no decomposition is generated after exposure to an environment with the humidity of 30% for 24 hours).