161 results about "Mixed matrix" patented technology

The invention discloses a high-solid-content MIL-101 (Fe) / PIM-1 mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas separation membranes. The preparation method comprises the following steps: firstly, dissolving an iron source in a PIM-1 polymer solution to form a homogeneous membrane casting solution; forming the obtained membrane casting solution, and removing the solvent to obtain a PIM-1 / Fe (II) composite substrate containing Fe (III); then, the substrate is alternately immersed in a terephthalic acid methanol solution and a ferric salt methanol solution, and MIL-101 (Fe) is generated in the polymer matrix through in-situ limited crystallization by layer-by-layer limited crystallization. According to the method, the problem of interfacial compatibility between the MOF filler and the polymer matrix is effectively solved, and high loading capacity (up to 52.9 wt.%) of MIL-101 (Fe) is realized without agglomeration. Meanwhile, the membrane has excellent COplasticizing resistance and long-term operation stability, and has a wide application prospect in the fields of carbon capture and the like.

The invention discloses a mixed matrix membrane for efficient oxygen and nitrogen separation and a preparation method and application thereof. The mixed matrix membrane comprises a polymer continuous phase and an MOF filler uniformly dispersed in the polymer continuous phase, the MOF filler can separate nitrogen and oxygen, and the surface of the MOF filler is modified by the silane coupling agent, so that the MOF filler is well compatible with a polymer, and the oxygen-nitrogen separation effect is improved. The polymer solution and the MOF filler dispersion liquid are mixed, the mixed matrix membrane is prepared through the non-solvent induced phase separation method, and the method has the advantages of being simple in reaction condition, high in efficiency, easy to amplify and the like and has wide engineering prospects.

The invention discloses a preparation method of a negative electricity microenvironment MOF (Metal Organic Framework) carbon capture material, the carbon capture material takes a Cu-AD-xF material with a negative electricity microenvironment as a filler and polyether block polyamide Pebax as a polymer matrix, and the carbon capture material is formed by physically blending the filler and the polymer matrix at normal temperature. The invention also discloses the negative electricity microenvironment MOF carbon capture material prepared by the preparation method and application thereof. The negative electricity microenvironment MOF carbon capture material can realize selective recognition of CO2 in a mixed matrix membrane, so that CO2 / CH4 mixed gas is effectively separated.

The present application relates to the technical field of surface treatment, in particular to a kind of biobased degradable cable material and preparation method thereof.Biobased degradable cable material includes 55-65 parts of poly-L-lactic acid and poly-3-hydroxybutyric acid-3-hydroxyhexanoate mixed matrix resin, 4-6 parts of dianhydride modified castor oil polyol, 10-15 parts of polyaminoval, 5-8 parts of nano enhanced filler, 6-10 parts of biobased plasticizer, 0.5-1.0 parts of antioxidant, 8-12 parts of environmentally friendly flame retardant.Dynamic ester bond crosslinking agent dianhydride modified castor oil polyol reaction forms dynamic ester bond crosslinking network, ester bond breakage occurs at high temperature beyond normal working range to release stress, temperature returns to normal and can recombine again;Semi-interpenetrating network enhanced phase polyaminoval forms interpenetrating structure with matrix resin in molecular chain interlacing mode, constructs stable heat-resistant skeleton, effectively inhibits high-temperature deformation, and its biobased structure ensures the overall degradability of the material, realizes the balance of heat resistance and degradability.

The invention relates to a membrane material, in particular to a mixed matrix membrane with high filler loading capacity and a preparation method thereof. According to the invention, the MOF particle modification layer polymer and the film-forming polymer both adopt PIM-1, so that the interface energy is reduced, and the compatibility between the filler and the film layer is improved, thereby greatly increasing the filler loading capacity in the film-forming polymer.

This invention relates to the field of gas separation membrane material preparation, and discloses a CO2 separation mixed matrix composite membrane and its preparation method. The method includes: mixing an amino-containing MOF, a bridging ligand, a first solvent, and an optional first catalyst and carrying out a first reaction; separating a solid product from the first reaction product to obtain a pre-modified solid; mixing the pre-modified solid, a portion of an amino polymer, a second solvent, and an optional second catalyst and carrying out a second reaction; separating a solid product from the second reaction product to obtain a modified MOF; mixing the modified MOF with water to obtain a mixture; then mixing the mixture with another portion of an amino polymer and coating it onto a polysulfone ultrafiltration membrane containing a silicone rubber interlayer. The CO2 separation mixed matrix membrane exhibits significant wetting between particles and the amino polymer, without generating interfacial defects, and has a high MOF loading, resulting in excellent carbon dioxide separation performance.

The application discloses a preparation method of a Zr-based metal-organic framework-based mixed matrix membrane, and relates to the field of gas separation membranes.The mixed matrix membrane is prepared by taking a defect-exchanged Zr-based metal-organic framework material as a filler and polyimide 6FDA-DAM as a polymer matrix.The application overcomes the defects of the prior art, and o-TBA-U iO is prepared by dispersing a defect state U iO-66 in an N,N-dimethylformamide solution of o-TBA (o-Tri-fluoromethyl benzoic acid) and then performing a heating reaction, followed by centrifugation, washing and drying in sequence.Then, the o-TBA-U iO is mixed with 6FDA-DAM in a chloroform solution, and a mixed matrix membrane is prepared by a solvent evaporation method.The application has the advantages and benefits that the MOF-based mixed matrix gas separation membrane has good C3H6 permeability and ultrahigh C3H6 / C3H8 ideal selectivity, and the main reason is that the introduction of o-Tri-fluoromethyl benzoic acid enhances the molecular sieving ability of the membrane for C3H6 / C3H8 and the preferential diffusion rate of C3H6.

The invention discloses an ethanolamine modified KMnF3at-Zn-MOF-74 mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas separation membranes. According to the method, KMnF3 nanoparticles serve as a core, Zn-MOF-74 grows on the surface of the KMnF3 nanoparticles in situ, and KMnF3-coated Zn-MOF-74 of a core-shell structure is obtained. Then, ethanolamine is used for carrying out amination modification on the Zn-MOF-74, so that-OH and-NH2 in the ethanolamine are subjected to coordination or hydrogen bond interaction with open metal sites of the Zn-MOF-74, and the polarity of the filler and the interfacial compatibility with Pebax-1657 are remarkably improved. The modified KMnF3 (at) Zn-MOF-74 is uniformly dispersed in a Pebax-1657 polymer matrix, so that the Pebax-1657 mixed matrix membrane of the ethanolamine modified KMnF3 (at) Zn-MOF-74 is prepared, and the selectivity and the permeability of a CO2 / N2 system are remarkably improved. The preparation process is mild, simple and convenient, the controllability is high, and the obtained membrane is stable in structure and excellent in performance and can be widely applied to the field of CO2 capture and separation.

The invention discloses a nanofluid mixed matrix membrane as well as a preparation method and application thereof, and belongs to the field of gas separation. The nanofluid mixed matrix membrane comprises a polymer matrix and a nanofluid filler, the nanofluid filler is of a three-dimensional layered structure, a core layer is a porous material layer, a secondary outer layer is a coupling agent connecting layer, and an outermost layer is an organic matter coronal layer containing a CO2-philic group. The coronal layer improves the compatibility of the porous material and the polymer matrix and increases the CO2 affinity of the mixed matrix membrane, not only increases the diffusivity of the mixed matrix membrane, but also increases the CO2 solubility, and due to the unique connection mode between the porous core and the coronal layer, the thermal stability of the porous core and the coronal layer is also enhanced. Therefore, the prepared novel efficient mixed matrix membrane has good gas separation performance and thermal stability and is especially suitable for CO2 separation, and CO2 / H2 of the product breaks through the Robeson upper limit in 2008.

This invention discloses a two-dimensional MUF-16 nanosheet, a hybrid matrix membrane, its preparation method, and its application in separation. The two-dimensional MUF-16 nanosheet has a lateral dimension of 500-900 nm and a thickness of 100-300 nm, possessing a 0.76 nm one-dimensional microporous network, with 2-3 nm textured mesopores derived from lamellar misalignment. Addressing the problem of intra-membrane aggregation and interface defects caused by the large crystal size of conventional MUF-16, this invention introduces a monocarboxylic acid modifier as a morphology modifier, combined with a cobalt metal source, to precisely block the growth of specific crystal faces through steric hindrance, successfully preparing the two-dimensional MUF-16 nanosheet. Furthermore, it is dispersed as a filler in a Pebax-2533 polymer matrix, and a high-performance hybrid matrix membrane is constructed through spin-coating. Its CO2 permeability coefficient reaches 511.47 Barrer, and its CO2 / N2 separation factor reaches 37.82. This hybrid matrix membrane exhibits excellent resistance to plasticization and long-term service stability, and has broad commercial application prospects in fields such as industrial flue gas decarbonization, natural gas purification, and biogas upgrading.

The invention provides a CD (at) HZ composite material with electrostatic gating, a preparation method of the CD (at) HZ composite material and application of the CD (at) HZ composite material in carbon capture, and belongs to the technical field of composite material preparation, mixed matrix membrane material preparation and carbon capture. The preparation method comprises the following steps: compounding CD and HZ to obtain a CD-coated HZ composite material with electrostatic gating, and physically blending the CD-coated HZ composite material serving as a filling agent with a Pebax matrix to form a mixed matrix membrane; in the mixed matrix membrane, CD selectively recognizes CO2 and CH4 through electrostatic interaction force, HZ provides a rapid CO2 transfer channel, and the mixed matrix membrane has excellent selectivity on CO2 / CH4, can efficiently separate CO2 / CH4 and has good application in carbon capture.

The invention belongs to the technical field of gas separation membranes, and relates to a mixed matrix membrane based on a preformed covalent organic framework network, and a preparation method and application thereof. The mixed matrix membrane comprises a COF network, a polyimide polymer and a self-supported flexible substrate, and the mixed matrix membrane is MATT-COFTD-x; the polymer is polyimide Matrimid5218, and the 3D interconnection COF network is a COFTD (Chip On Fiber Transfer Device) network; the COF network is prepared by reacting an aldehyde monomer and an amino monomer on the surface of the SiO2 / Si substrate through a liquid-solid interfacial polymerization method. According to the prepared mixed matrix membrane, filler agglomeration is eliminated, a continuous 3D interconnected COF network is provided, ultra-fast gas transmission is allowed, high permeability and high selectivity are achieved, and meanwhile stable high performance is still kept under the conditions of high pressure, different H2 / CH4 mixing ratios and the like.

The invention discloses a high-purity disilane production system and a high-purity disilane production method. The system comprises a reactor (100), a primary gas-solid separator (200), supercharging equipment (300), a secondary gas-solid separator (400), a gas separation membrane assembly (500), a light component removal tower (600) and a product tower (700) which are sequentially connected through pipelines. The core of the invention lies in that a two-stage gas-solid separation structure is adopted to effectively solve the contradiction between the low-pressure operation of the reactor and the high-pressure feeding of the membrane module, and core equipment is fully protected; meanwhile, a mixed matrix molecular sieve membrane is arranged in the gas separation membrane assembly, and screening of hydrogen and monosilane molecules can be efficiently achieved, so that the reaction byproduct hydrogen is removed through a one-step method. According to the method, monosilane is taken as a raw material, after reaction synthesis, primary dust removal, pressurization, fine dust removal, membrane-method dehydrogenation and rectification separation are sequentially carried out on a product, a high-purity disilane product is finally obtained, and unreacted monosilane is returned to a system for cyclic utilization.

The present application relates to the geological exploration technical field, more particularly, to a deep water super shallow layer natural gas reservoir rock physics shear wave velocity prediction method, comprising: calculating equivalent bulk modulus, shear modulus and density of a plurality of mineral mixed matrix according to shale content; then calculating skeleton bulk modulus and shear modulus; then calculating saturated rock bulk modulus and shear modulus through a model, and calculating saturated rock density through rock matrix density; distributing longitudinal and transverse velocities of suspended state and bearing state, and calculating equivalent longitudinal and transverse wave velocities; using equivalent longitudinal wave velocity to construct an inversion objective function with longitudinal wave velocity as a known condition; comparing actual longitudinal wave velocity with calculated longitudinal wave velocity; realizing nonlinear inversion of transverse wave velocity according to an algorithm, and obtaining transverse wave velocity of a to-be-inverted work area. The present application simultaneously considers rock physics models of particle suspended state and bearing state, and realizes transverse wave velocity prediction and deep water super shallow layer natural gas reservoir transverse wave velocity direct inversion.

The invention belongs to the technical field of gas separation membranes, and discloses a mixed matrix membrane based on an ultramicroporous amino-functionalized covalent organic framework and a preparation method and application of the mixed matrix membrane, and the preparation method comprises the following steps: dissolving a covalent organic framework material Py-COF and a pore splitting agent in a mixed solution of n-butyl alcohol, acetic acid and water; after ultrasonic treatment, stirring while heating to obtain an ultra-microporous amino-functionalized covalent organic framework; and blending the ultramicroporous amino-functionalized covalent organic framework with a polyether-polyamide block copolymer solution, transferring the mixture to a substrate, and drying the mixture. According to the invention, a pore segmentation strategy is used for pore structure regulation and functionalization of the two-dimensional COF, and accurate shrinkage of the pore diameter of the Py-COF from micropores to ultramicropores and in-situ modification of NH2 functional groups of pore walls are synchronously realized through the Py-COF and the pore segmentation agent, so that the mixed matrix membrane has high permeability, high selectivity and excellent stability, and is especially suitable for efficient capture and separation of CO2.

The invention discloses a preparation method of a ZIF-67 / PDMS mixed matrix pervaporation membrane, which comprises the following steps: dissolving 2-methylimidazole and docusate sodium in methanol to obtain a 2-methylimidazole solution; the preparation method comprises the following steps: uniformly mixing a methanol solution of cobalt nitrate hexahydrate and a 2-methylimidazole solution, standing to obtain a ZIF-67 precursor suspension, carrying out solid-liquid separation to obtain ZIF-67 crystals, uniformly dispersing the ZIF-67 crystals in ethanol, adding polydimethylsiloxane into the ZIF-67 crystals, uniformly dispersing the ZIF-67 crystals to obtain a suspension, adding a cross-linking agent and a catalyst into the suspension, uniformly stirring to obtain a ZIF-67 / PDMS coating solution, and carrying out vacuum drying on the ZIF-67 / PDMS coating solution. And uniformly coating the surface of a PVDF substrate membrane with the obtained product, crosslinking at normal temperature, and drying to obtain the product. Compared with a pure PDMS pervaporation membrane, the ZIF-67 / PDMS mixed matrix membrane has the advantages that the separation factor of the ZIF-67 / PDMS mixed matrix membrane on a linalool and water mixed system is obviously improved, and the membrane flux is up to 600-700 mgm <-2 > h <-1 >. The method is applied to a pervaporation technology to separate aromatic substances in food, and after a to-be-intercepted side solution is subjected to series processing to form a product, a permeation side solution rich in the aromatic substances is backfilled into the product, so that the aroma of the product is repaired.

The application discloses a single-particle layer metal organic framework mixed matrix nanometer porous membrane and a preparation method thereof, and belongs to the field of functional materials and membrane separation technology. The preparation method comprises the following steps: firstly, synthesizing MOF nanoparticles; then, self-assembling the MOF particles and polystyrene balls on the water surface; after treatment, obtaining a MOF single-particle layer; finally, adding a proper amount of a polymer binder to fill the gaps between the MOF particles, so that a single-particle layer MOF mixed matrix nanometer porous membrane is obtained. The single-particle layer MOF mixed matrix nanometer porous membrane prepared by the preparation method is composed of a single-particle layer, has an ultrathin thickness and high strength, and the transmembrane transport of substances in the membrane only needs to pass through a single MOF particle, so that the nanometer porous structure of the MOF particle can be used to the maximum extent, the negative influence of polymer blockage and grain boundary between particles on the substance transport of the nanometer porous membrane is avoided, and the single-particle layer MOF mixed matrix nanometer porous membrane has high selectivity and high permeability.

The invention discloses a double-constraint second-order blind identification bridge dynamic deflection signal noise reduction method, which comprises the following steps: acquiring dynamic deflection observation signals of bridge target points, and constructing an observation signal matrix by using the observation signals of at least three adjacent target points; carrying out centralization processing on the observation signal matrix, and carrying out whitening transformation to obtain a whitening signal with a covariance matrix as a unit matrix; selecting a group of non-zero time delay values, calculating a time delay covariance matrix of the whitening signal under each time delay, and performing joint approximate diagonalization on all the time delay covariance matrixes to obtain a separation matrix and an initial separation source signal; optimizing the separation matrix based on sparsity constraint to obtain a hybrid matrix; performing dominant frequency optimization on the initial separation source signal; and reconstructing based on the optimized hybrid matrix and the optimized main frequency source signal to obtain a de-noised bridge dynamic deflection signal. The hybrid matrix optimization based on the sparsity constraint enables the reconstruction result to be closer to the real bridge dynamic deformation.

This invention discloses a fine-tuning method for long-tail image recognition based on a gradient reweighted expert module. The method includes: Step 1: Constructing a fine-tuning model for long-tail recognition; Step 2: Inputting training data and completing forward propagation; Step 3: Calculating the training loss based on the prediction results; Step 4: Calculating the sample-level gradient contribution of the shared mixture matrix; Step 5: Statistically analyzing the gradient deposition of the shared mixture matrix by category; Step 6: Generating gradient redistribution weights based on the category deposition; Step 7: Re-aggregating the gradients of the shared mixture matrix and updating the parameters; Step 8: Repeating the training process until the termination condition is met; Step 9: Outputting the fine-tuned long-tail image recognition model. This application improves the influence of tail categories on the shared adaptation structure, thereby improving the performance of long-tail recognition.

The invention provides a hollow gas separation membrane and a preparation method and application thereof, the hollow gas separation membrane comprises a first nonporous compact separation layer, a support layer and a second nonporous compact separation layer, the first compact separation layer and the second compact separation layer comprise a polymer, and the support layer comprises a two-dimensional material and an ionic liquid; wherein the molecular structure of the ionic liquid contains an imidazolium cation group, and the content of the imidazolium cation group is 0.01%-0.5% based on 100% of the mass of the hollow fiber membrane. The product provided by the invention solves the problem of agglomeration of a two-dimensional material in a polymer matrix when a mixed matrix membrane is manufactured, so that the transmission resistance is reduced, and the gas permeability of a separation membrane is increased; and the ionic liquid is intercalated in the two-dimensional material, and separation selectivity and permeability are synchronously improved through intercalation reaming, double adsorption sites and a lubricating effect.

The invention relates to the technical field of materials for taking water from air, in particular to a high-water-absorption MOFs mixed matrix membrane as well as a preparation method and application thereof. The high-water-absorption MOFs mixed matrix membrane comprises a PET (polyethylene terephthalate) non-woven fabric and a water-absorption MOFs-PVDF (Polyvinylidene Fluoride) mixed membrane, wherein the water-absorption MOFs-PVDF mixed membrane is mainly prepared by compounding water-absorption MOFs and PVDF. The water-absorbing MOFs mixed matrix membrane is prepared by blending MOFs through an electrostatic spinning method, and the performance problem occurring after the material absorbs water can be effectively avoided by utilizing the stability of the membrane material. According to the invention, the hydrophobic PVDF membrane with strong chemical stability, high thermal stability and strong weatherability is selected as a carrier of the MOF material, and the water-absorbing MOFs mixed matrix membrane is cured on two sides of the base material through an electrostatic spinning method to form a composite structure of a water-absorbing MOFs-PVDF mixed membrane / PET / water-absorbing MOFs-PVDF mixed membrane, so that the mechanical strength is enhanced.

This invention discloses a multi-harmonic source responsibility quantification method based on asynchronous measurement, relating to the field of power quality harmonic technology. The method includes measuring the harmonic voltage of the bus of interest and the harmonic current at the connection point between each harmonic source and the bus of interest to construct the observed signal. After centering and whitening, a covariance matrix is ​​constructed. For the covariance matrix, the optimal common orthogonal matrix is ​​determined, and the source signal matrix is ​​reconstructed. The harmonic transfer impedance corresponding to each harmonic source signal is calculated based on a fast-changing component model. Each harmonic source signal is multiplied by its corresponding harmonic transfer impedance to obtain the harmonic voltage of the corresponding harmonic source. The harmonic voltage is projected onto the harmonic voltage of the bus of interest to achieve multi-harmonic source responsibility quantification. This method does not rely on GPS, simplifying the operation steps of multi-harmonic source responsibility quantification and helping to improve quantization efficiency. Simultaneously, the sparsity of the hybrid matrix reduces the computational dimensionality, alleviating the computational burden and improving quantization accuracy.

The purpose of this invention is to provide a method for preparing a mixed matrix membrane for CO2 / CH4 separation, belonging to the field of gas separation technology. This method prepares a mixed matrix membrane by incorporating Cu(Qc)2 into a 6FDA-DAM matrix, which improves the limiting effect between the permeability and selectivity of the 6FDA-DAM membrane and greatly enhances the CO2 permeability coefficient and CO2 / CH4 selectivity.

The application belongs to the technical field of preparation of photo-thermal water production membranes, and discloses a CAT-based mixed matrix membrane, a preparation method and application, which is made of Ti-CAT, CNT and PCMVIMX; the three-dimensional network structure Ti-CAT is used as a water transmission channel, the CNT acts as a solar light absorber to increase the light absorption of the membrane, and the self-crosslinking property of PCMVIMX under ammonia gas is used as an adhesive to crosslink Ti-CAT and CNT together, and finally a dense photo-thermal water production membrane is formed. The water production membrane has good acid-base stability, excellent cycle performance and salt resistance. The membrane preparation method is simple and convenient, and can quickly prepare a high-speed water production membrane. The method is suitable for preparing a mixed matrix membrane of a porous material and a carbon material, and in general cases, the preparation of a photo-thermal water production membrane usually uses a coating method. The method for preparing the membrane by using such a polyelectrolyte as an adhesive is helpful to improve the stability of the membrane.

The invention discloses a preparation method and application of an in-situ copolymerized PIM-pillararene composite membrane, a tetrahydroxy-containing compound and a tetrafluoro-containing compound are used as reaction monomers, a precursor matrix is synthesized by adjusting the proportion of the tetrafluoro-containing compound, and then a mixed matrix polymer is obtained by in-situ doping of polyhydroxy pillararene. Dissolving a polymer in an organic solvent to obtain a membrane casting solution; and coating a solvent-resistant substrate with the membrane casting solution, and drying in a drying oven to obtain the composite membrane with high separation performance. Fluorine groups in a PIM matrix and hydroxyl groups on cyclic polyhydroxy aromatic hydrocarbon molecules are subjected to chemical cross-linking reaction to enhance the porosity of the polymer and increase the specific surface area, and column aromatic rings are introduced to promote adsorption of guest molecules, so that rich high-performance transmission channels are formed. On the basis of PIM synthesis, a polyhydroxy pillar arene compound is further introduced, the membrane stability can be improved through a rich net structure, and the separation performance of common organic solvents is remarkably improved.

The invention belongs to the technical field of preparation and application of carbon molecular sieve membranes, and discloses a preparation method of a heteroatom induced pore and transition metal coordinated carbon molecular sieve gas separation membrane. According to the heteroatom and transition metal modified carbon molecular sieve, a high-molecular polymer is used as a precursor, an additive containing heteroatoms and a transition metal compound are introduced for blending modification, a mixed matrix membrane containing heteroatoms and transition metal components is prepared, and the mixed matrix membrane is carbonized into a carbon molecular sieve membrane at a certain carbonization temperature and atmosphere. By introducing heteroatom components with different thermal stability, the heteroatom components are partially decomposed in the pyrolysis process, so that the microporous structure of the membrane material is regulated and controlled; meanwhile, the transition metal component exists in the carbon molecular sieve membrane in an atomic or nanoscale form and forms reversible pi coordination with a C = C bond of C2H4, so that the selectivity is improved. The method provides a wide-prospect strategy for developing a high-performance CMS membrane and realizing efficient C2H4 / C2H6 separation.

This invention belongs to the field of MOF mixed matrix membrane technology, and discloses a MOF mixed matrix membrane for ion sieving and its preparation method. The preparation method includes dissolving an organic ligand and a metal source in an organic compound, ultrasonically treating it to obtain a precursor solution, subjecting the precursor solution to a hydrothermal reaction to obtain a first intermediate product, washing and vacuum drying the first intermediate product to obtain MOF-808 powder; dissolving 8-hydroxyquinoline in anhydrous ethanol, adding the MOF-808 powder, and sealing and stirring to obtain 8-Hq@MOF-808 powder; filtering the 8-Hq@MOF-808 powder onto a substrate, spin-coating an epoxy resin solution onto the substrate containing the 8-Hq@MOF-808 powder, and drying at room temperature to obtain the MOF mixed matrix membrane. The phenolic hydroxyl oxygen atom and pyridine ring nitrogen atom of 8-hydroxyquinoline act as bidentate ligands, forming a stable five-membered chelate ring with metal ions, exhibiting high coordination efficiency.

The invention discloses an electroencephalogram signal reconstruction method and system based on artifact removal. The method comprises the steps that multi-channel electroencephalogram signals are obtained and subjected to filtering preprocessing; blind source separation is carried out through independent component analysis, and statistical independent signal source components and a hybrid matrix are obtained through decomposition; constructing an equivalent current dipole model to calculate a space artifact index, evaluating signal complexity in combination with a time sequence sample entropy, and judging and identifying an artifact component and a neural activity component through weighted fusion and a self-adaptive threshold value; neural activity components are reserved, artifact components are zeroed, and pure electroencephalogram signals are reconstructed through mixed matrix inverse transformation. According to the method, accurate identification and effective removal of the electroencephalogram artifacts are realized, and high-quality data are provided for electroencephalogram analysis.

The invention belongs to the technical field of pervaporation membrane preparation, and relates to preparation and application of a zwitter-ion vinyl covalent organic framework mixed matrix membrane for ethanol and water separation. The preparation method comprises the following steps: adding an aldehyde monomer, a methyl monomer and 4-dimethylaminopyridine into deionized water, carrying out ultrasonic treatment to obtain turbid liquid, freezing with liquid nitrogen, sealing with flame, heating for reaction, collecting a solid product after the reaction is finished, and carrying out centrifugal washing and vacuum drying to obtain yellow powder. The preparation method comprises the following steps: adding deionized water, uniformly mixing, adding sodium alginate, carrying out a stirring reaction, filtering and standing after the reaction is finished to obtain a homogeneous solution, spin-coating the homogeneous solution on a polyacrylonitrile substrate, carrying out cross-linking treatment by using a Ca < 2 + > solution, and drying to obtain the mixed matrix membrane. The preparation process provided by the invention is simple and controllable, has good stability, is applied to an ethanol / water system, has high permeability and high selectivity, and provides a new possibility for an efficient separation process of ethanol and water.