23 results about "Membrane matrix" patented technology

The invention belongs to the technical field of membrane separation, and discloses a composite membrane formed by compounding a loose nanofiltration layer on an ultrafiltration layer and a preparation method and application of the composite membrane. Polyphenol covalent bonds and non-covalent bonds (hydrogen bonds, pi-pi accumulation) are adsorbed on an ultrafiltration membrane matrix to form functional active sites, and then a low-activity aldehyde group substance and polyphenol are subjected to a Schiff base reaction to form a covalent anchoring network; then a flexible long-chain amido substance is introduced to slowly permeate into the network to carry out Michael addition reaction or Schiff base reaction, supplementary crosslinking is carried out with residual functional groups, and finally, the flexible long-chain amido substance reacts with a low-concentration aldehyde solution for a short time to carry out secondary surface crosslinking to form a stable and loose nanofiltration layer network structure. Through step-by-step and interface regulation and control design, the process is simple, the condition is mild, stable and repeated preparation can be realized, and an innovative high-performance technical solution is provided for the practical application of the membrane material for deep treatment and resource recycling of dye wastewater.

The invention relates to the technical field of membrane materials, and discloses a preparation method and application of a metal organic framework surface modified flat sheet membrane, the preparation method of the metal organic framework surface modified flat sheet membrane comprises the following steps: step 1, preparing MMOF nanoparticles; step 2, preparing liquid PFS; step 3, preparing a PFS-MMOFs dispersion liquid; 4, material surface modification; 5, material surface post-treatment: soaking a pre-treated flat sheet membrane substrate in the PFS-MMOFs dispersion liquid obtained in the step 3 for a seventh preset time, taking out the flat sheet membrane substrate, washing the flat sheet membrane substrate with deionized water, and drying the flat sheet membrane substrate to obtain a PFS-MMOFs modified flat sheet membrane; the removal performance of the polyvinyl alcohol membrane on new pollutants is effectively improved by using a metal organic framework and combining with a chemical method for modification, the modification process is easy to implement, and in addition, the method has important significance on application of the polyvinyl alcohol flat sheet membrane in the field of water treatment and can be applied to the fields of sewage treatment, seawater desalination, new energy and the like.

The invention relates to the field of fuel cells, in particular to a high-performance membrane electrode for electrolyzed water as well as a preparation method and application of the high-performance membrane electrode. The membrane electrode comprises a proton exchange membrane and catalyst layers coating the two sides of the proton exchange membrane, and the proton exchange membrane comprises a sulfonated polyethersulfone base membrane, a reinforcing layer covering the sulfonated polyethersulfone base membrane and a sulfonated polyethersulfone top layer membrane covering the reinforcing layer; the enhancement layer is an expanded polytetrafluoroethylene porous membrane; and the catalyst layer contains sulfonated polyethersulfone. Meanwhile, an integrated thermal crosslinking strategy is adopted in the preparation method, and the ionomer layer and the membrane substrate are jointly crosslinked, so that the body proton conductivity is remarkably improved, and the interface contact resistance is reduced.

The invention belongs to the technical field of separation membrane materials, and relates to a preparation method and application of a one-step bionic beetle catalytic membrane, and the preparation method comprises the following steps: directly dispersing a hydrophilic nano-catalyst in a trifluoroacetic acid membrane casting solution of PET, and carrying out one-step molding through a non-solvent induced phase separation technology. In the phase inversion process, the catalyst spontaneously segregates and is anchored on the surface of the membrane and in pore channels to form a'hydrophilic bulge-hydrophobic substrate 'heterogeneous wetting structure simulating the backs of desert beetles, so that one-step in-situ integration of a membrane matrix, bionic morphology and a catalytic function is realized. The prepared membrane has excellent oil-water separation performance and catalytic degradation capability, the water-in-oil emulsion separation efficiency is greater than 99.5%, and organic pollutants can be rapidly degraded in the presence of hydrogen peroxide. The invention has the advantages of simple and efficient process, low cost and stable structure, and is suitable for advanced treatment and synchronous purification of complex oily wastewater.

The invention relates to the technical field of biological tissue engineering, in particular to injectable amnion compound gel as well as a preparation method and application thereof. The problems that an existing material is non-adjustable in degradation and mechanical property, amnion particles are prone to displacement and sedimentation, cell loading is insufficient, and repairing is not long-acting are solved. Comprising a composite stent membrane and aldehyde hyaluronic acid gel in a mass ratio of 1: (3-10), and the membrane is formed by freeze-drying and grinding a composite stent; the stent comprises an upper electrostatic spinning fiber membrane layer, a decellularized amnion matrix middle layer and a lower electrostatic spinning fiber membrane layer which are sequentially stacked and are crosslinked and combined into a whole; electrostatic spinning fibers in the upper electrostatic spinning fiber membrane layer and the lower electrostatic spinning fiber membrane layer are of core-shell structures, and raw material components of shell layers comprise natural high polymer materials; the core raw material component comprises a synthetic high polymer material. The preparation method comprises the following steps: preparing the decellularized amniotic membrane matrix, constructing the gradient fiber membrane layer through coaxial electrostatic spinning, cross-linking tannic acid, freeze-drying and grinding, and preparing and compounding formylated hyaluronic acid gel.

The invention provides a subject-object interface assembled double-ligand MOF and PVA mixed matrix membrane, which is prepared by the following steps: jointly dissolving metal salt and amino acid in deionized water, carrying out ultrasonic treatment, adding a solubilizer, carrying out ultrasonic treatment, adding an active substance, carrying out ultrasonic treatment, carrying out hydrothermal reaction on the obtained mixture at 60-100 DEG C for 1-3 hours, centrifuging to take a solid, and drying to obtain the subject-object interface assembled double-ligand MOF and PVA mixed matrix membrane. Washing with ethanol, and drying to obtain a subject-object interface assembled double-ligand MOF (Metal Organic Framework); dispersing the film-forming matrix in deionized water, and performing water bath at 60-100 DEG C for 1-3 hours to obtain a film-forming matrix solution; adding the host-guest interface assembled double-ligand MOF into the film-forming matrix solution, uniformly stirring to obtain a film-forming solution, carrying out tape casting on the film-forming solution, and drying to obtain a host-guest interface assembled double-ligand MOF (at) PVA mixed matrix film; the preservative is safe and non-toxic, has good hydrophobic property, barrier property and remarkable antibacterial property, and lays a solid and reliable foundation for deep research in the field of preservation.

The invention provides an anticoagulant hollow fiber membrane for blood purification and a preparation method thereof, and relates to the technical field of medical polymer membranes, and the preparation method comprises the following steps: respectively introducing a spinning solution and an internal solidification solution into a coaxial spinning nozzle for hollow fiber spinning, so that the spinning solution is firstly in contact with the internal solidification solution on a lumen side, an initial phase separation interface is formed on the lumen side, and the initial phase separation interface is formed on the lumen side; according to the preparation method, a hydrophilic polymer component and a surface anticoagulation modification component are introduced into a polyether sulfone membrane matrix, and the solvent exchange rate between an internal coagulation liquid and a spinning liquid is controlled in the spinning phase inversion process, so that a sulfobetaine polymer is directionally migrated to a lumen side interface and is enriched on a blood contact inner surface; on the premise of ensuring the structural strength of the membrane body and the stability of the pore structure, a high-density anticoagulation functional layer is constructed on a blood contact interface, so that the separation of structural support and interface functions is realized, the blood compatibility is improved, and the blood coagulation risk is reduced.

The invention relates to the technical field of medical instruments, in particular to an anti-blocking self-elution flow divider for treating hydrocephalus, which comprises a liquid storage vessel, the outer wall of the liquid storage vessel is provided with a liquid inlet hole, the inner wall of the liquid storage vessel is rotatably connected with a micro turbine, and the outer wall of a rotating shaft of the micro turbine is fixedly connected with a micro fan blade. Heavy impurities are separated through centrifugal force generated by flowing of cerebrospinal fluid through the liquid storage vessel and the tangentially-formed liquid inlet holes, the hidden danger of blockage is reduced fundamentally, the coating of the drainage tube can also actively degrade attached blockages such as protein and biological membrane matrixes, and through the drainage tube, the functional coating of the drainage tube is utilized, so that the drainage effect is improved. Depending on the slow release characteristic of the biodegradable polymer matrix and the long-term effect of the catalyst, the degradation function can last for a long time, the expected service life of the shunt tube is matched, meanwhile, the coating integrates the antibacterial function and the anticoagulation function, shunt failure caused by infection and thrombus is reduced, and the service life is further prolonged.

The application discloses a kind of nanometer coating modified ceramic membranes for oxygen-enriched combustion and a preparation method thereof, and belongs to the technical field of ceramic oxygen-permeable membrane.The ceramic membrane grows in situ a zinc-tin composite oxide nanostructure layer with specific stoichiometric ratio and micro-morphology on the surface of mixed conductor ceramic oxygen-permeable membrane matrix, significantly improving the oxygen permeability and high temperature stability.The three-dimensional "nanoflower" porous covering layer structure can effectively increase the oxygen permeation active sites, promote the surface exchange and bulk diffusion of oxygen ions.The perovskite oxide selected as the matrix has excellent oxygen ion and electron mixed conduction characteristics, providing a basis for high oxygen permeation flux.The preparation method precisely controls the steps of matrix membrane preparation, pretreatment, precursor preparation, in-situ hydrothermal growth and programmed temperature calcination, and cooperatively improves the high temperature oxygen permeation flux, CO2 corrosion resistance and long-term stability of the membrane, solving the problem that flux and stability are difficult to balance in the prior art.

The application belongs to the field of water treatment, and particularly relates to a graphene-based quinone mediator membrane as well as a preparation method and application thereof. The graphene-based quinone mediator membrane comprises a membrane matrix and graphene, amino imidazo pyridine and humus dispersed in the membrane matrix; the material of the membrane matrix is polyvinylidene fluoride / butadiene, the polyvinylidene fluoride / butadiene is a random copolymer of vinylidene fluoride and butadiene, and an anthraquinone modification unit is connected to a butadiene structural unit of the random copolymer. The graphene-based quinone mediator membrane provided by the application has a high initial denitrification rate and a denitrification rate over time.

This invention relates to the field of bio-tissue engineering technology, and particularly to an injectable amniotic membrane compound gel, its preparation method, and its application. It addresses the problems of degradation and unadjustable mechanical properties of existing materials, easy displacement and sedimentation of amniotic membrane particles, insufficient cell loading, and short-lasting repair effects. The gel comprises a composite scaffold membrane and an aldehyde-based hyaluronic acid gel in a mass ratio of 1:3 to 10. The membrane is formed by freeze-drying and grinding the composite scaffold. The scaffold comprises a sequentially stacked upper electrospun fiber membrane layer, a decellularized amniotic membrane matrix intermediate layer, and a lower electrospun fiber membrane layer, cross-linked and bonded together. The electrospun fibers in the upper and lower electrospun fiber membrane layers have a core-shell structure. The shell layer raw material components include natural polymer materials, and the core raw material components include synthetic polymer materials. The preparation method includes preparing a decellularized amniotic membrane matrix, constructing a gradient fiber membrane layer through coaxial electrospinning, cross-linking with tannic acid, freeze-drying and grinding, and preparing and compounding the aldehyde-based hyaluronic acid gel.

The present application relates to the technical field of waterproofing membrane, and particularly relates to an anti-aging waterproofing membrane and a preparation process thereof. The preparation process of the anti-aging waterproofing membrane comprises the following steps: preparing a composite antioxidant, preparing a composite ultraviolet inhibitor, preparing a modified chitosan flame retardant, and preparing the waterproofing membrane. In the present application, the halloysite nanotube is pretreated, dispersed in an ethanol solution, and then reacted with tetraethyl orthosilicate under the catalysis of dibutyltin dilaurate to obtain a nano hybrid carrier. Then, the nano hybrid carrier is surface-modified with KH-560, and 4-amino diphenylamine is loaded onto the surface of the nano hybrid carrier by the bridging action of the KH-560, so as to prepare a supported composite antioxidant. After the supported composite antioxidant is added into the waterproofing membrane, it can be uniformly dispersed in the waterproofing membrane matrix, so as to improve the thermal-oxidative aging resistance of the waterproofing membrane. In addition, after being dispersed in the waterproofing membrane matrix, the supported composite antioxidant can act as a rigid skeleton, so as to effectively improve the tensile strength of the waterproofing membrane.

Provided are a decellularized amniotic membrane matrix hydrogel and its preparation method, which includes the following steps: pre-treatment of an amniotic membrane tissue, washing, decellularization, grinding, freeze-drying, digestion, and acid-base neutralization processes. The decellularized amniotic membrane matrix hydrogel provided in this disclosure retains components such as collagen, fibronectin, and glycoproteins from the amniotic membrane while removing viable cells, thereby reducing its immunogenicity at the source. The decellularized amniotic membrane matrix hydrogel may mimic the microenvironment in which cells exist in vivo, providing the necessary support and signals for cell adhesion and growth. It can be used to construct tissue engineering scaffolds, supporting directed cell growth and tissue regeneration. Furthermore, the decellularized amniotic membrane matrix hydrogel may also serve as a drug carrier for in vivo drug release and therapy, demonstrating significant potential for application in medical research and clinical settings.

This invention discloses a method for preparing a PEI-anchored KNN / PVDF-TrFE piezoelectric membrane, belonging to the field of water treatment membrane materials and membrane fouling control technology. Addressing the challenges of existing piezoelectric membranes in achieving both high permeability and effective piezoelectric response, as well as the severe membrane fouling in membrane bioreactors and the high energy consumption and potential damage to membrane materials associated with traditional fouling control methods, this invention uses P(VDF-TrFE) as the membrane matrix, lead-free piezoelectric ceramic potassium sodium niobate (KNN) as the functional filler, and polyethyleneimine (PEI) as the interface anchoring agent. A solvent-free / temperature-induced phase separation method is employed to prepare the composite piezoelectric membrane. After optimization using response surface methodology, the resulting membrane achieves a pure water flux of 2180 L / m² / h and a piezoelectric coefficient d₃₃ of 30.2 pC / N under optimal conditions. Driven by a 10 V, 50 Hz AC electric field, the composite membrane exhibits a localized inverse piezoelectric response at the pore edges, reducing the fouling layer thickness by approximately 30% and increasing the steady-state flux by approximately 184%, demonstrating excellent in-situ antifouling performance. This method has a simple preparation process and uses environmentally friendly materials, which can provide a functional membrane material basis for MBR membrane fouling control in municipal and industrial wastewater.

The invention provides a hydrophobic waterproof coating, a coating and a multilayer hydrophobic waterproof interlayer containing the hydrophobic waterproof coating. The hydrophobic waterproof coating comprises a film-forming substrate and a hydrophobic component, wherein the hydrophobic component comprises a phthalocyanine compound as shown in a formula I in the specification. The coating disclosed by the invention contains specific phthalocyanine molecules, so that the coating has extremely low surface energy, and the coating is endowed with a super-hydrophobic characteristic. The multilayer hydrophobic waterproof interlayer comprises a supporting layer located at the bottom and a hydrophobic waterproof layer located at the top, wherein the hydrophobic waterproof layer is coated with the hydrophobic waterproof coating. The hydrophobic waterproof coating and the interlayer are suitable for anti-condensation protection of outdoor power boxes and cabinets, and can effectively improve the operation reliability and prolong the service life of power equipment. Formula I

This invention relates to a proton exchange membrane and its preparation method, comprising the following steps: preparing a composite functional unit, including: dispersing nano-ferroelectric materials in a covalent organic framework; or introducing a precursor for forming the nano-ferroelectric materials into the covalent organic framework and growing the nano-ferroelectric materials in situ within the covalent organic framework; mixing the composite functional unit with a film-forming matrix material to form a casting solution, wherein the mixing method is physical blending or in-situ polymerization of the composite functional unit with monomers for forming the film-forming matrix material; and molding and drying the casting solution to obtain the proton exchange membrane. By combining nano-ferroelectric materials with a covalent organic framework to construct a composite functional unit, and then introducing it into the proton exchange membrane matrix material, the proton dissociation energy can be reduced and the proton conduction rate can be increased; at the same time, cation shuttle is suppressed, improving the overall stability of the membrane, such as temperature resistance, moisture resistance, and swelling resistance.

The invention discloses a nano-coated modified ceramic membrane for oxygen-enriched combustion and a preparation method of the nano-coated modified ceramic membrane, and belongs to the technical field of ceramic oxygen permeation membranes. According to the ceramic membrane, the zinc-tin composite oxide nano-structure layer with a specific stoichiometric ratio and microstructure grows on the surface of the mixed conductor ceramic oxygen permeation membrane substrate in situ, so that the oxygen permeation performance and the high-temperature stability are remarkably improved. Wherein the three-dimensional nanoflower-shaped porous covering layer structure can effectively increase oxygen permeation active sites and promote surface exchange and bulk phase diffusion of oxygen ions. The perovskite type oxide selected by the substrate has excellent oxygen ion and electron mixed conduction characteristics, and provides a basis for high oxygen permeation flux. According to the preparation method, the high-temperature oxygen permeation flux, CO2 corrosion resistance and long-term stability of the membrane are synergistically improved through precise control of the steps of matrix membrane preparation, pretreatment, precursor solution preparation, in-situ hydrothermal growth, temperature programming roasting and the like, and the problem that the flux and the stability are difficult to consider at the same time in the prior art is solved.

The invention discloses a hollow fiber hemodialysis membrane based on in-situ self-assembly and a preparation method thereof. According to the membrane, PES is used as a matrix, PES, PVP and SF are co-dissolved in a N, N-dimethylacetamide DMAc solvent according to a specific proportion, and dry-wet spinning and an accurate non-solvent induced phase separation regulation technology are adopted, so that the silk fibroin and PVP have a synergistic effect in the phase inversion process, and the membrane is prepared. And multi-stage microphase separation and self-assembly are carried out, so that in-situ and lasting anchoring on the membrane substrate and the surface is realized. The dialysis membrane prepared by the method has excellent long-acting pollution resistance, excellent blood compatibility and a stable three-dimensional gradient structure. The invention further provides an intelligent response type expansion scheme of the membrane, and the membrane can dynamically adjust the performance according to the physiological state of a patient by introducing an environment response component, so that individualized precise dialysis is realized.

The invention particularly relates to an anti-virus filtering container which comprises a liquid storage part used for containing liquid, the first end of the liquid storage part is of a closed structure, and the second end of the liquid storage part is provided with an opening allowing the liquid to enter; the cover body is detachably connected with the second end of the liquid storage part, and the cover body is provided with a suction nozzle and a filter element connecting part; the filter element assembly is connected with the cover body through an element connecting part; the suction nozzle is communicated with the filter element assembly through the filter element connecting part so as to allow liquid to flow; the filter element assembly comprises a shell and a hollow fiber membrane, a water inlet hole is formed in the shell, a hollow part for accommodating the hollow fiber membrane is arranged in the shell, and antiviral material particles are doped in the hollow fiber membrane. In the application, the antiviral material particles are added in the preparation process of the membrane, so that the antiviral material particles are distributed in the membrane matrix and on the surface of the membrane in an embedded and dispersed form to form an integrated composite structure, thereby improving the virus removal effect.

This invention provides a method for preparing a polyvinylidene fluoride (PVDF) metal-organic framework (MOF) hybrid membrane and the hybrid membrane itself. The method utilizes the advantages of MOFs, such as well-developed internal pores, ease of functionalization, diverse structural morphologies, and good compatibility with polymer matrices. By introducing monodisperse UiO-66 or UiO-66-NH2 MOF materials into the PVDF membrane matrix through blending modification, the pore shape and size can be effectively adjusted, resulting in a hybrid ultrafiltration membrane with high permeability selectivity. This preparation method is simple, easy to implement, and low in cost, and is of great significance for the development of hybrid ultrafiltration membranes. The prepared PVDF MOF hybrid membrane exhibits a high rejection rate for organic matter in drinking water and good antifouling performance, making it suitable for applications in wastewater reuse and advanced drinking water treatment.

The application belongs to the technical field of separation membrane materials, and relates to a preparation method of a one-step biomimetic beetle catalytic membrane and application thereof, the preparation method comprising directly dispersing a hydrophilic nano catalyst in a PET trifluoroacetic acid casting solution, and one-step forming through a non-solvent induced phase separation technology. In the phase inversion process, the catalyst is spontaneously segregated and anchored on the membrane surface and in the pores, forming a "hydrophilic protrusion-hydrophobic substrate" heterogeneous wetting structure similar to the back of a desert beetle, realizing one-step in-situ integration of the membrane matrix, biomimetic morphology and catalytic function. The prepared membrane has excellent oil-water separation performance and catalytic degradation capacity, the separation efficiency of the oil-in-water emulsion is greater than 99.5%, and the organic pollutants can be rapidly degraded in the presence of hydrogen peroxide. The application has the advantages of simple and efficient process, low cost and stable structure, and is suitable for deep treatment and synchronous purification of complex oily wastewater.

This invention relates to an autologous active biomembrane for promoting the repair of breast augmentation surgery wounds and its application, belonging to the field of medical materials technology, and suitable for skin wound repair scenarios. This invention provides an active biomembrane loaded with an ICA-TGF-DEF fusion protein, wherein the ICA-TGF-DEF fusion protein is selected from any of the amino acid sequences shown in SEQ ID NO:4-6. The biomembrane uses collagen as the membrane matrix, and then the ICA-TGF-DEF fusion protein shown in any of SEQ ID NO:4-6 is cross-linked with the collagen membrane matrix to obtain an autologous active biomembrane for promoting the repair of breast augmentation surgery wounds. In terms of physical properties, this biomembrane has a high expansion rate, porosity, and high protein loading. In terms of biological activity, this biomembrane can significantly enhance cell adhesion and proliferation, and can also create an antibacterial wound microenvironment to promote tissue repair, making it particularly suitable for wound repair after breast augmentation surgery, accelerating tissue healing and reducing the risk of infection and fibrosis.

The application provides a recombinant Pseudomonas aeruginosa cell adhesion protein CdrA-F1, and a preparation method and application thereof. The application predicts the three-dimensional structure, antigenicity, epitope distribution and other information of CdrA and the detection of the physicochemical properties of the recombinant protein by using a biological information analysis tool such as AlphaFold 2, and constructs and screens the gene recombinant protein CdrA-F1. The recombinant protein CdrA-F1 of the application is expressed in a soluble form in Escherichia coli.