47 results about "MXenes" patented technology

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 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.

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 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 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 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 an MXenes two-dimensional material doped polyimide plastic and a preparation method thereof, and relates to the field of special engineering plastics, the preparation method comprises the following steps: in an inert gas atmosphere, mixing an MXenes powder material, a first solvent, a dispersant and a coupling agent to obtain an MXenes material dispersion liquid; and adding the MXenes material dispersion liquid, a diamine monomer and a dianhydride monomer into a second solvent, and carrying out a polymerization reaction. The MXenes two-dimensional material is introduced into the polyimide engineering plastic mainly through an in-situ polymerization method, so that the surface resistivity and the volume resistivity of polyimide are remarkably reduced, and the polyimide engineering plastic has excellent antistatic performance. Meanwhile, the material can keep inherent high temperature resistance, mechanical strength and wear resistance of polyimide, uniform dispersion of MXenes in a matrix is ensured through a special preparation process, and the process is simple and suitable for industrial production.

The application discloses a method for preparing MXene containing fluorine functional groups by a gas phase method and application, an electrode and a battery thereof, wherein the method uses sulfur hexafluoride gas as an etching agent, the sulfur hexafluoride gas reacts with a MAX phase material to etch the A component in the MAX phase material, and the MXene material is obtained; the MXene material has an accordion-like morphology or a two-dimensional sheet layer morphology; it is found that the SF6 gas can react with the MAX phase material by etching, and it is clear that the SF6 gas first reacts with the A component; based on the finding, by controlling the reaction conditions (time and temperature), the A component in the MAX phase material can be selectively etched, and then the MXene material is obtained, a new etching agent for preparing the MXene is provided, and the preparation technical route of the MXene is expanded. The SF6 gas etching is used to prepare the MXene, the gas is a colorless, odorless, non-toxic and non-combustible stable gas, has high safety, and is suitable for being used as a gas source for industrialized macro-preparation of the MXene material.

The invention provides an ultrafiltration membrane as well as a preparation method and application thereof. The ultrafiltration membrane is prepared from the following raw materials in parts by weight: 15-25 parts of polyvinylidene fluoride; 1 to 5 parts of polyvinylpyrrolidone; 1 to 8 parts of MXene; and 100 parts of a solvent. According to the invention, polyvinylidene fluoride is taken as a membrane base material, polyvinylpyrrolidone with good water solubility is taken as a pore-foaming agent, and an MXenes material is introduced, so that the prepared ultrafiltration membrane has excellent anti-pollution performance, relatively high water flux and rejection rate, good tensile strength and relatively high flux recovery rate.

The application discloses a preparation method of an electromagnetic shielding film, and comprises the following steps: preparing an MXenes dispersion liquid; dispersing a heat-conducting filler in anhydrous ethanol to prepare a heat-conducting filler dispersion liquid; adding the heat-conducting filler dispersion liquid into the MXenes dispersion liquid to obtain a mixed slurry; and shaping and drying the mixed slurry to obtain the electromagnetic shielding film, wherein the heat-conducting filler is one or a combination of silicon nitride, aluminum nitride, zirconium carbide, tantalum carbide and hafnium carbide. The application further discloses an electromagnetic shielding film. The electromagnetic shielding film prepared by the application has excellent electromagnetic shielding performance, heat-conducting performance, and good flexibility.

The invention discloses an SERS (Surface Enhanced Raman Scattering) sensor as well as a preparation method and application thereof, and relates to the technical field of compound detection, the SERS sensor comprises gold nanoparticles, an MXenes material and bacterial cellulose hydrogel; the gold nanoparticles are loaded on the MXenes material to form a composite nano material; the composite nano material is dispersed and fixed in the bacterial cellulose hydrogel; according to the application, the gold nanoparticles are loaded on the MXenes material, and meanwhile, the MXenes material (Mxene / Au NPs) loaded with the gold nanoparticles is dispersed and fixed in the bacterial cellulose hydrogel, so that a good dispersion and support environment is provided for the Mxene / Au NPs, agglomeration of nano ions is effectively avoided, the SERS sensor is endowed with good aerosol performance, and the SERS sensor has good application prospects. The full contact of a target detection object and the SERS sensor is facilitated, and the detection sensitivity is further improved.

This invention belongs to the field of lithium-ion battery material preparation technology, specifically relating to an MXene-doped silicon-carbon anode material, its preparation, and its application in gel-state soft-pack lithium-ion batteries. This anode material uses non-Ti-based MXenes such as V₂C, Nb₂C, and Mo₂C, utilizing their superior properties compared to Ti₃C₂T. x A lower lithium-ion diffusion barrier and higher theoretical capacity are achieved through strong interfacial bonding via Si–O–M chemical bonds, constructing a dual-network conductive framework. The fabrication process employs a synergistic design of chemical bonding, a dual-network conductive framework, and a gel electrolyte, significantly improving the rate performance of the anode material. The pouch cell with the gel electrolyte achieves 5000 cycles at 1C and 50000 cycles at 5–10C, overcoming the limitations of existing technologies in conductivity and structural stability. This significantly enhances the battery's high-rate performance and ultra-long cycle life from a material composition perspective.

The application belongs to the technical field of new energy material (including ion battery, catalysis, capacitor and the like), and particularly relates to a preparation method of low-temperature MXenes-based in-situ growth CNTs composite material. The method is characterized in that a catalyst is loaded between layers and on the surface of MXenes material, CNTs are in-situ grown between layers of MXenes material under a carbon source atmosphere, and a MXenes / CNT composite material is obtained. By introducing the catalyst, the growth temperature of CNTs is greatly reduced and the CNTs are uniformly distributed. The in-situ growth of CNTs between layers of MXenes increases the layer spacing of MXenes, provides a larger diffusion channel for electrolyte, and improves the specific surface area of the material and provides more electrochemical active sites. The MXenes / CNT composite material prepared by the application has high specific surface area, large layer spacing, higher structural stability, low preparation temperature, adjustable layer spacing and excellent electrochemical performance.

This invention provides a phase change composite aerogel material for photothermal conversion and high-density thermal storage. The material uses MXenes / CNTs modified aerogel as a three-dimensional porous continuous support framework and a phase change material as the filler. The phase change composite aerogel material, by mass percentage (100%), comprises 3.0-4.4% MXenes / CNTs modified aerogel and 95.6-97.0% phase change material. This invention also provides a method for preparing the above-mentioned phase change composite aerogel material. The MXenes / CNTs modified aerogel composite phase change material prepared by this invention is at the micron level, with MXenes and CNTs attached to its surface and interior. It has a large heat transfer area, good heat transfer performance, and good mechanical properties, making it suitable for a wide range of applications. The preparation method of this invention is simple, and the reaction time and conditions are easy to control. This invention also provides an application of the above-mentioned phase change composite aerogel material in solar photothermal conversion and thermal storage materials.

The present application belongs to the technical field of electrocatalysis, and particularly relates to a porous titanium-based Mxenes composite electrocatalytic film as well as a preparation method and application thereof. The present application discloses a porous titanium-based Mxenes composite electrocatalytic film, which comprises a support film and a catalytic film arranged on at least one surface of the support film. The support film comprises a porous titanium metal, and the catalytic film comprises Mxenes. The porous titanium-based Mxenes composite electrocatalytic film takes Mxenes with high catalytic activity as a functional layer, significantly improves the mineralization and degradation effect of the electrocatalytic film on organic pollutants in water, effectively reduces the pollution of the catalytic film, improves the stability and applicability of the composite electrocatalytic film, and increases the service life and use scenarios of the electrocatalytic film.

The application relates to the technical field of electrochemical energy storage, and specifically discloses a preparation process of a multi-element halogenated MXenes / carbon fiber metal lithium negative electrode. The preparation process of the multi-element halogenated MXenes / carbon fiber metal lithium negative electrode comprises the following steps: performing acidizing pretreatment on carbon fibers to obtain acidized carbon fibers; preparing an MXene colloidal dispersion liquid; immersing the acidized carbon fibers in the MXene colloidal dispersion liquid to obtain a composite precursor; performing heat treatment on the composite precursor and a halide source in a protective atmosphere to obtain a multi-element halogenated MXenes / carbon fiber composite framework; and performing metal lithium loading treatment on the composite framework to obtain the multi-element halogenated MXenes / carbon fiber metal lithium negative electrode. In addition, the preparation method has the advantages of stable combination of MXenes and carbon fibers, uniform lithium ion deposition and simple process.

This paper presents a molecularly imprinted electrochemical sensor for aspartic acid (Asp) and its preparation and detection methods. Belonging to the field of electrochemical analysis and detection, the method involves physically mixing polyethyleneimine (PEI) with multi-walled carbon nanotubes (MXenes) to form a single-layer tubular fiber structure. The MXenes are then bridged by polyethyleneimine to disperse and load the MXenes onto the surface and between the pores of layered MXenes, resulting in a highly conductive MWCNTs-PEI-MXene nanocomposite material that serves as the substrate, enhancing the signal response of the molecularly imprinted sensor. Using o-phenylenediamine as the functional monomer and aspartic acid as the template molecule, a molecularly imprinted electrochemical sensor is constructed, improving the specificity of the electrochemical sensor for Aspartic acid. This preparation method is simple, and the resulting molecularly imprinted electrochemical sensor exhibits good selectivity, reproducibility, and long-term stability, maintaining 92.8% of its initial value even after 7 days of continuous monitoring. This achieves sensitive and specific analysis of Aspartic acid in real samples.

The invention relates to a p-aminophenol electrochemical sensor, a preparation method and application. The invention discloses a one-week WSe2 and Se / Ti < 3 > C < 2 > T < x > MXenes nano material compound modified glassy carbon electrode and a preparation method thereof. The glassy carbon electrode sensor has the advantages of convenience in operation, low cost, high detection speed and real-time monitoring. The p-aminophenol can be accurately detected, the linear range of detection is wide, the detection limit is low, and the anti-interference performance is high.

This invention discloses a low-doped, alkali-free liquid accelerator of MXenes, its preparation method, and its application. By weight percentage, the low-doped, alkali-free liquid accelerator of MXenes comprises 0.5%-1.5% MXenes, 47%-62% accelerator, 1.8%-3.8% stabilizer, 1.5%-3% pH adjuster, and the balance being water. The accelerator includes aluminum sulfate compounds, magnesium salts, and dodecacalcium heptaaluminate. The stabilizer is a water-soluble organic compound containing hydroxyl groups. In this invention, the added nano-sized MXenes, due to their unique layered structure, prevent the hydration inhibition of gypsum in the initial stage of cement hydration. Simultaneously, utilizing their small size effect, they increase the cement's viscosity and synergistically promote the cement setting rate with dodecacalcium heptaaluminate, providing a feasible solution for reducing the dosage of accelerators.

A methodology for non-metallic (anions; nitrogen, sulfur) electron donor incorporation in a MXene material by annealing of MXene in a furnace with a solid sulfur / nitrogen precursor compound (thiourea) under flowing pure nitrogen gas and hydrogen gas. MXenes are a family of layered 2D carbide materials based on a structure similar to M3C2Tx where M is a metal such as titanium and T represents surface termination groups such as oxygen, fluorine, etc.

This invention belongs to the field of photocatalysis and carbon dioxide resource utilization technology, and relates to a method for preparing and applying an ultrathin basic copper chloride-coated titanium dioxide / MXenes photothermal catalytic film. The photothermal catalytic film comprises: titanium dioxide particles, an ultrathin Cu2(OH)3Cl coating layer in situ coated on its surface to form a T@CCOH photocatalytic material, and a Ti3C2T composite with T@CCOH. x MXenes membrane. The preparation method of this membrane is also disclosed: first, T@CCOH is prepared through an in-situ aging-drying process; then, an MXenes membrane is prepared through etching, stripping, and vacuum filtration; finally, the two are coupled through direct loading or intercalation composite methods. This photothermal catalytic membrane is used for the "nighttime capture-daytime photothermal reduction" process of low-concentration CO2: in the dark, the CCOH layer efficiently adsorbs and enriches CO2; under illumination, TiO2 excites carriers, and the photothermal heating of MXenes promotes reaction kinetics. Without MXenes coupling, the main product is CH4; after coupling, C-C coupling is enhanced, generating multi-carbon products such as C2H4. This invention has advantages such as simple process, high energy utilization, and controllable products.

The application relates to a kind of fluorine-free green atomic level manufacturing method and device based on controllable micro-explosion MXenes, belong to two-dimensional energy storage material and atomic level precision manufacturing technical field.The application uses transition metal energetic complex and energetic carbon source compound as metal carbon-energy integrated precursor, under the restraint of array type nano-limit microcavity, realizes the directional self-assembly of nanosecond-level fluorine-free MXenes by synchronously triggering controllable micro-explosion through nanosecond laser, combined with directional template and uniform electric field, completely gives up traditional fluoride etching process.The preparation cycle of the application is compressed to 10 minutes or less, the comprehensive energy consumption is only 1% or less of the traditional process, the product is fluorine-free residue, the conductivity is greater than or equal to 10000S / m, 100% compatible with existing mass production line, suitable for large-scale manufacturing in the fields of supercapacitor, lithium ion battery, electromagnetic shielding and the like.

This invention discloses a microwave-absorbing and heating coating for metal cookware used in microwave ovens and its preparation method. The microwave-absorbing and heating coating is prepared from layered Mxenes powder, magnetic iron tetroxide powder or γ-iron oxide powder, tungsten carbide powder, polyvinylidene fluoride powder, aluminosilicate powder, and a high-temperature resistant glass adhesive. This invention uses the microwave-absorbing and heating coating material as a heat source, utilizing the heat generated by the absorbing material under microwave action, which can solve the problem that metal cookware cannot heat the food inside the cavity in a microwave oven.

The application belongs to the technical field of material performance prediction, and discloses a MXenes material performance prediction method based on a graph neural network, which comprises the following steps: obtaining structural characteristic parameters of a to-be-predicted MXenes material; respectively matching node derivative information, edge derivative information and global derivative information based on the structural characteristic parameters; constructing an initial feature vector set based on the node derivative information, the edge derivative information and the global derivative information, and based on an edge feature vector and a global feature vector; and performing hierarchical processing on each feature vector in the initial feature vector set through each layer of the graph neural network to obtain a target performance index of the to-be-predicted MXenes material. The scheme effectively solves the key technical problems in the prior art, such as insufficient coding of geometric information and inability to effectively distinguish intra-layer and inter-layer interactions.

The invention discloses a two-dimensional composite material and a laser liquid phase ablation preparation method thereof, the material is M (at) MXenes or M (at) MBenes of metal nanoparticle loaded two-dimensional MXene or MBene, the loaded metal and substrate metal are homologous, and the loading capacity is 1.0-10wt.%; the preparation method comprises the following steps: irradiating an MXenes / MBenes suspension by adopting 532 nm or 1064 nm laser, opening an M-C or M-B bond by virtue of an instantaneous high-temperature and high-pressure effect, inducing in-situ self-decomposition, and generating high-dispersion load particles on an incompletely decomposed sheet layer; the preparation method is simple, rapid and controllable, the obtained material is used for a magnesium-oxygen battery, reaction kinetics can be accelerated, charge-discharge polarization is reduced, and low overpotential and long cycle life are achieved.

The invention discloses conductive latex as well as a preparation method and application thereof, and belongs to the technical field of labor protection glove materials. The latex comprises the following components in parts by dry glue: 100 parts of natural latex, 3-8 parts of urea intercalation-zinc modified MXenes hybrid conductive filler (Urea-Zn-MXene), 1-3 parts of a composite dispersant compounded by lignosulfonate and polyoxyethylene ether according to a ratio of 1: 1, and assistants such as a vulcanizing agent and a stabilizer. The preparation method comprises the following steps: preparing the filler and the dispersing agent into slurry, mixing the slurry with the cured latex matrix, pre-vulcanizing until the chloroform value is 40-50, and then adjusting the viscosity. The filler is subjected to urea intercalation stripping and zinc modification to obtain a two-dimensional lamellar structure, and is uniformly dispersed in latex under the cooperation of a composite dispersant to construct a three-dimensional conductive network, the touch is sensitive and uniform, and meanwhile, the mechanical strength, wear resistance, puncture resistance and chemical medium resistance of an adhesive film are remarkably improved. The latex is suitable for coating glove blanks to prepare touch screen labor protection gloves, and has conductivity, comfort and durability.

Methods for modifying the surface termination of two-dimensional (2D) transition metal carbides (MXenes) are provided. The methods, which allow for versatile chemical modification of the terminating anions via halide exchange or substitution and elimination reactions in molten inorganic salts, provide a processing approach that is widely applicable to MXenes as a broad class of functional materials.