62 results about "Hydrogel membrane" patented technology

The present disclosure relates to a layered bimetallic hydroxide-based hydrogel bipolar membrane and a method for preparing the same. The method includes: blade-coating a quaternized polyethersulfone solution on a substrate, and carrying out drying to obtain an anion exchange layer; immersing the layer sequentially and cyclically in a sodium alginate solution and a first metal ion mixed solution to obtain a hydrogel anion exchange membrane; immersing the hydrogel membrane sequentially in a second metal ion mixed solution and an alkaline solution; and blade-coating a sulfonated polyethersulfone solution on the obtained membrane, and carrying out drying to obtain the layered bimetallic hydroxide-based hydrogel bipolar membrane. The anion and cation exchange membrane layers on two sides of the bipolar membrane prepared in the present disclosure are closely bound by way of hydrogel cross-linking. The bipolar membrane has the advantages of high water dissociation efficiency, low energy consumption, and good stability.

The invention provides a cow dung organic controlled-release fertilizer and a preparation method thereof. The preparation method comprises the following steps: preparing porous cow dung biochar; preparing a cow dung organic fertilizer; uniformly mixing and stirring the porous cow dung biochar, the natural fibers in the treated cow dung and the cow dung organic fertilizer, and extruding and granulating in a granulator at normal temperature; drying to obtain the composite porous cow dung biochar with the sea urchin structure; preparing a hydrogel membrane solution, soaking the composite porous cow dung biochar with the sea urchin structure in the hydrogel membrane solution, and drying to obtain the cow dung organic controlled-release fertilizer. The cow dung organic controlled-release fertilizer formed by wrapping the cellulose hydrogel film layer with the composite porous cow dung biochar with the sea urchin structure is adopted, the porous cow dung biochar retains organic matter and nutritional ingredients in cow dung, and meanwhile moisture and pathogenic microorganisms are reduced through the carbonization process; the organic fertilizer is suitable for release and utilization of long-acting nutrient substances, the cow dung organic fertilizer is slowly released and utilized firstly, and the cow dung biochar is released and utilized for a long time.

The invention discloses a bacteriophage-loaded gelatin hydrogel membrane as well as a preparation method and application thereof. The hydrogel film comprises the following raw materials: gelatin, glycerol and bacteriophage, the mass ratio of the gelatin to the glycerol is 1: (0.05-0.3), and the content of the bacteriophage in the hydrogel film is 106-107 PFU / g. Through physical encapsulation of the gelatin hydrogel film, the activity of the bacteriophage is effectively protected, the survival time of the bacteriophage in the storage process is prolonged, controllable slow release of the bacteriophage is achieved, and the continuous antibacterial effect of the bacteriophage on the surface of food is ensured.

The invention discloses a preparation method and application of a zero-emission salt-resistant and acid-resistant hydrogel antibacterial filtering membrane. The method comprises the following steps: preparing a calcium alginate hydrogel membrane through calcium ion cross-linking, filtering a cross-linked cross-linking agent aqueous solution in which the concentration of calcium ions is reduced and sodium ions are introduced by using a nanofiltration membrane, supplementing soluble calcium salt into the ionic cross-linking agent aqueous solution in which the sodium ions are removed, and recovering the mass percent concentration of the calcium ions to be 2.5%, so that the regeneration of the ionic cross-linking agent solution is realized. And carrying out chemical crosslinking on the calcium alginate hydrogel membrane by adopting glutaraldehyde to obtain the zero-emission salt-resistant acid-resistant hydrogel antibacterial filtering membrane. Glutaraldehyde is added into the aqueous solution of glutaraldehyde after chemical crosslinking, and the mass percent concentration of glutaraldehyde is recovered to 3.0%, so that the regeneration of the chemical crosslinking agent solution is realized, and the zero emission requirement is met. The excellent antibacterial property of glutaraldehyde endows the film with obvious advantages in the aspects of storage and bacterial breeding inhibition. The hydrogel antibacterial filtering membrane can be applied to separation of dyes and inorganic salts under the conditions of high salt content and acidic pH.

The invention belongs to the technical field of hydrogel biological materials. Aiming at the problem that the pore size of hydrogel cannot be effectively reduced by the post-treatment method of the existing hydrogel membrane material, the invention provides a preparation method of a hydrogel compound, which is used for reducing the pore size of a biological hydrogel material. The preparation method comprises the following steps of: soaking in a pre-polymerization solution containing methyl methacrylate, 2-hydroxyethyl methacrylate and ethylene glycol dimethacrylate, and carrying out free radical polymerization reaction, so as to generate a composite hydrogel material with smaller pore diameter or no pore. The method is simple to operate and rapid in preparation; by adjusting the concentration of the pre-polymerized solution, the hydrogel and the acrylate polymer in the prepared composite hydrogel are interspersed with each other, and the pore diameter of the composite hydrogel can be adjusted.

An atmospheric water capturing device for transforming water vapor into liquid water has a plurality of channels. The device further includes a plurality of hydrogel membranes. Each hydrogel membrane having a surface that at least partly defines a respective channel of the plurality of channels. A liquid desiccant is in contact with a side of each hydrogel membrane opposite the surface of the hydrogel membrane that at least partly defines the respective channel.

A method for producing a hydrogel membrane includes adding a volume of alginate solution to a solution containing calcium ions, maintaining the volume of alginate solution in the solution containing calcium ions until a hydrogel membrane forms on an exterior surface of the volume of alginate solution by the cross-linking of alginate in the volume of alginate solution by the calcium ions, and recovering the hydrogel membrane. In aspects, the recovered hydrogel membrane is in the shape of a bead, a net, threads, or grains.

The application discloses a fluorescent / colorimetric dual-mode sensor for hydrogen sulfide detection and a preparation method thereof. The method comprises the following steps: synthesizing gold nanoclusters and metal-organic framework materials in situ to obtain a gold nanocluster / metal-organic framework composite material, uniformly mixing the composite material and sodium alginate to obtain a casting solution, and then dropping the casting solution on a substrate to perform scraping, molding and cleaning to obtain a gold nanocluster / metal-organic framework hydrogel membrane sensor. The sensor not only has a significant improvement in the fluorescence performance, but also can respond to hydrogen sulfide in the fluorescence and colorimetric channels respectively, and has the advantages of high sensitivity and high selectivity.

A double-layer hydrogel membrane evaporator containing an activated water layer, belonging to the field of polymer functional membranes, is constructed using optical cross-linking coupled in-situ polymerization technology. The lower hydrogel membrane contains a large number of hydrophilic functional groups, which weaken the hydrogen bonding between water molecules in the hydrogel membrane, increase the proportion of intermediate water, and reduce its evaporation enthalpy, thereby continuously providing activated water molecules for the generation of water vapor in the upper hydrogel membrane. The photothermal conversion material in the upper hydrogel layer provides energy for the efficient conversion of activated water into water vapor molecules, while the pore structure of the hydrogel membrane creates a rapid mass transfer channel for water molecules, achieving efficient water purification.

This invention discloses an aramid 1414-based aerogel membrane material for oily wastewater separation, its preparation method, and its applications. The membrane material comprises a superhydrophilic electrospun substrate membrane and aramid 1414 nanofibers loaded on the surface and internal pores of the substrate membrane. The aramid 1414 nanofibers are filled by negative pressure filtration and then freeze-dried to form an aerogel structure. The preparation method includes: preparing a superhydrophilic electrospun substrate membrane; preparing a nanofiber dispersion of aramid 1414 and polyacrylonitrile; loading the aramid 1414 nanofibers onto the substrate membrane by negative pressure filtration to form a hydrogel membrane; and freeze-drying the hydrogel membrane. This invention achieves highly efficient separation of submicron-sized emulsified oil by filling the electrospun substrate membrane with aramid 1414 nanofibers to form a submicron-sized pore structure, achieving a separation efficiency of up to 99.10%. The preparation process is simple and cost-controllable, showing promising application prospects in the field of oily wastewater treatment.

The application discloses a preparation method and application of a poly-amidoxime semi-interpenetrating network hydrogel membrane, and belongs to the technical field of heavy metal removal. The agarose hydrogel material is used as a base and a crosslinking material, and the self-prepared poly-amidoxime is used as a functional monomer, so that the poly-amidoxime semi-interpenetrating agarose hydrogel membrane is prepared by using a one-step method through temperature control. The preparation method is simple, the conditions are mild, the cost is low, and the poly-amidoxime is uniformly loaded. In addition, the poly-amidoxime semi-interpenetrating agarose hydrogel membrane prepared by the method has high adsorption performance on heavy metal lead, is easy to separate, has no secondary pollution characteristics, and has excellent stability and reusability, and in particular, has little influence on active ingredients in traditional Chinese medicine extract. The poly-amidoxime semi-interpenetrating agarose hydrogel membrane can be used in the fields of heavy metal removal of traditional Chinese medicine extract, various waste water, organic phase heavy metal adsorption and separation.

This invention relates to a method for preparing a biomass-based biodegradable dust suppressant and a spraying device, comprising the following components by weight percentage: 0.78% biomass matrix, 20.7% salt-precipitating solution, and the remainder being an acetic acid solution diluted with deionized water. The specific steps are as follows: adding biomass matrix powder to the acetic acid solution; pouring the salt-precipitating solution powder into the biomass matrix acetic acid solution; magnetically stirring for 30 minutes at 200 r / min and 30°C; and then sonicating for 10 minutes to ensure a complete reaction. This invention combines salt-precipitation with dust suppression technology, using high-concentration salt solutions such as sodium citrate and sodium sulfate. Utilizing the physicochemical interaction between salt ions and biomass material molecules, and through the synergistic effect of salt-precipitation-assisted precipitation and weak ion cross-linking, it breaks the limitations of traditional cross-linking methods, promoting the rapid formation of a three-dimensional network structure, thereby constructing a high-strength hydrogel membrane. This method allows for the simple and convenient preparation of a long-lasting and safe dust suppressant, effectively improving dust suppression efficiency and reducing dust suppression costs.

To prevent unwanted scarring after surgery.SOLUTION: A biocompatible membrane comprising alginate and hyaluronate is provided. The membrane may be used to prevent unwanted scarring after surgery. The tissue adherence and the rate of bioresorption of the membrane may be modified through an external stimulus comprising a sequestering agent and a viscosity modifier.SELECTED DRAWING: None

The invention relates to a drug sustained-release anti-adhesion hydrogel membrane and a preparation method and application thereof.The hydrogel membrane achieves physical adhesion resistance through a matrix of the hydrogel membrane and achieves the anti-hyperplasia effect through continuous release of loaded vitepofen, and the hydrogel membrane and the loaded vitepofen cooperate with each other, so that the clinical problem of two complications of stenosis and adhesion after a cavity pipeline operation is effectively solved.

The invention provides a multi-effect balanced private care hydrogel film as well as a preparation method and application thereof, and belongs to the technical field of medical biological materials. By integrating traditional Chinese medicine antibacterial components, inactivated probiotics and a hydrogel slow release technology, the hydrogel film with a three-layer structure, which has the functions of inhibiting bacteria, repairing mucous membranes and maintaining pH balance, is developed, and matrine inhibits staphylococcus aureus (the diameter of an inhibition zone is greater than or equal to 15mm); inactivated bacteria competitively inhibit the adhesion of pathogenic bacteria (the in-vitro adhesion inhibition rate is greater than or equal to 70%); zinc hyaluronate promotes mucous membrane repair (the cell migration rate is increased by 40%), and through the multi-target-point synergistic effect, good nursing and postoperative repair effects are achieved.

The invention discloses a chitosan / sodium carboxymethyl cellulose / calcium ion antibacterial composite hydrogel self-supporting membrane as well as a preparation method and application thereof. The composite hydrogel membrane takes nano-hydroxyapatite as a multifunctional calcium source and an adsorption enhancing component, and chitosan and sodium carboxymethyl cellulose are crosslinked through mandelic acid steam to form a dual-network matrix. The hydrogel film prepared by the method has the advantages of large metal ion adsorption capacity, excellent antibacterial property, good mechanical property and the like, and can realize the targets of high-efficiency removal of heavy metal ions in industrial wastewater and low-consumption pollution degradation.

The invention discloses a preparation method of a silver phosphate-containing hydrogel film for photodegradation of high-salt pollutants. The preparation method comprises the following steps: reacting silver nitrate with trisodium phosphate to obtain silver phosphate, preparing a mixture aqueous solution of silver phosphate and sodium alginate as a membrane casting solution, coating a non-woven fabric with the membrane casting solution under a winding transmission device, and crosslinking with an oxalic acid aqueous solution to obtain the silver phosphate-containing hydrogel membrane for photodegradation of high-salt pollutants. The hydrogel film is arranged in a fixed frame, the hydrogel film and the fixed frame are soaked in an aqueous solution of pollutants containing high-concentration inorganic salt, and the pollutants are degraded under irradiation of ultraviolet light or visible light. The preparation method comprises the following steps: dissolving a hydrogel film with reduced catalytic performance after repeated use with a sodium carbonate aqueous solution, carrying out centrifugal separation, washing with deionized water, and drying to obtain recovered silver phosphate powder, thereby re-preparing the hydrogel film containing silver phosphate for photodegradation of high-salt pollutants. The preparation method is simple, industrialization is easy, the photocatalyst silver phosphate can be recycled and regenerated, and good application prospects are achieved.

A biocompatible membrane comprised of alginate and hyaluronate. The membrane may be used to prevent unwanted scarring after surgery. The tissue adherence and the rate of bioresorption of the membrane may be modified through an external stimulus comprising a sequestering agent and a viscosity modifier.

The invention provides a method for preparing cellulose from traditional Chinese medicine industrial byproducts and application of the method, the traditional Chinese medicine industrial byproducts are used as raw materials, firstly, an acid solution is used for effectively destroying an anti-degradation barrier of lignocellulose and promoting dissolution of hemicellulose to realize preliminary purification of a fiber product, and then sodium chlorite-alkali liquor treatment is carried out to obtain the cellulose. Lignin and pigment components are deeply removed, so that the color of the extract is changed from light yellow to white, the purity of cellulose is improved to 90%, the best use of materials is realized, the green circular economy concept is met, the preparation operation is simple and convenient, the solvent is environment-friendly, and the method is suitable for industrial application. The cellulose is further subjected to ultrasonic dispersion to obtain a nano cellulose suspension, the nano cellulose suspension is subjected to reduced pressure filtration by adopting a microfiltration membrane, and a hydrogel membrane is formed on the surface of the microfiltration membrane, can be assembled in a vacuum filtration device as a filtration medium, is used for purification treatment of an aqueous solution containing suspended solids, and can purify a polluted water body; a solution which is low in cost and easy to operate is provided for water treatment.

The invention provides a medical dressing with high water absorption, high moisture retention, a drug loading function and good mechanical properties and a preparation method thereof. The medical dressing comprises a fiber skeleton and a hydrogel film, the fiber skeleton loads medicine components, calcium alginate hydrogel forms the hydrogel film on the fiber surface, the medicine components loaded on the fiber skeleton are embedded by the hydrogel film, gaps or grooves in the fiber surface are filled with medicine, and the hydrogel film is formed by calcium alginate hydrogel. After embedding, original gaps of the fiber skeleton are reserved, and the hydrogel film forms a honeycomb structure. The fiber skeleton provides required mechanical properties for the dressing, is used as a carrier of drug components, and has the remarkable advantages of wide adaptability to the drug components and large drug loading capacity. The hydrogel film swells when encountering water, and the medicine is continuously released. The hydrogel and fiber porous structure provides excellent moisture absorption and moisture retention performance for the dressing. The device can be designed into a gauze type, a porous foam type, an application type and the like according to needs, and has wide adaptability.

The present disclosure relates to a layered bimetallic hydroxide-based hydrogel bipolar membrane and a method for preparing the same. The method includes: blade-coating a quaternized polyethersulfone solution on a substrate, and carrying out drying to obtain an anion exchange layer; immersing the layer sequentially and cyclically in a sodium alginate solution and a first metal ion mixed solution to obtain a hydrogel anion exchange membrane; immersing the hydrogel membrane sequentially in a second metal ion mixed solution and an alkaline solution; and blade-coating a sulfonated polyethersulfone solution on the obtained membrane, and carrying out drying to obtain the layered bimetallic hydroxide-based hydrogel bipolar membrane. The anion and cation exchange membrane layers on two sides of the bipolar membrane prepared in the present disclosure are closely bound by way of hydrogel cross-linking. The bipolar membrane has the advantages of high water dissociation efficiency, low energy consumption, and good stability.

The application relates to a Ca3(PO4)2 crystal reinforced zwitterionic hydrogel membrane and a preparation method and application thereof, the application uses PVDF as a base film, the material is low in price, good in mechanical performance, friendly to the environment and good in recycling performance. Through a polyphenol-metal dual autocatalysis method, a layer of zwitterionic hydrogel is simply and efficiently grafted on the surface of the PVDF film without heating and ultraviolet irradiation. Through a mineralization technology, the zwitterionic hydrogel membrane reinforced by inorganic crystals is used for constructing an inorganic crystal reinforced zwitterionic hydrogel membrane, preparing an oil-water separation membrane which is resistant to pollution, good in mechanical performance and long-term stable and cyclic. The inorganic crystal reinforced zwitterionic hydrogel membrane has the advantages of strong hydration performance and high mechanical stability, has a high separation efficiency on oil-in-water emulsion, shows obvious anti-pollution performance and good cyclic stability. The preparation method is simple, convenient to operate, low in energy consumption, easy to handle and free of secondary pollution, meets the green chemistry concept and has a good application prospect in the field of oil-water separation.

The invention discloses a bacterial cellulose-based biological material and a preparation method thereof in the field of biomedical materials, and the method comprises the following steps: taking foal bacillus, fermenting, purifying and drying to obtain a BC hydrogel film; sequentially dropwise adding a zinc sulfate solution and a sodium phosphate solution into the BC hydrogel film to form a compact porous mineral layer; then immersing the BC hydrogel film into a dopamine hydrochloride solution to form a polydopamine layer; immersing the BC hydrogel film into the antibacterial peptide solution, so that the antibacterial peptide is anchored on the BC hydrogel film; and carrying out post-treatment on the BC hydrogel film to obtain the BC hydrogel film. The biological material disclosed by the invention has a dual-functional surface structure, one side of the biological material is a compact porous mineral layer which can efficiently and physically block bacteria, and meanwhile, the microporous structure allows free exchange of gas; the other side is in contact with a wound, and the high water holding property can be used for absorbing exudate to promote wound repair; and the polydopamine layer can realize a long-acting controllable antibacterial effect on the local part of the wound surface.

The invention discloses an AMPS-ethylenediaminetetraacetic acid antibacterial composite hydrogel film for removing heavy metal ions in industrial wastewater as well as a preparation method and application of the AMPS-ethylenediaminetetraacetic acid antibacterial composite hydrogel film. According to the composite hydrogel film, carbon felt is used as a reinforcing carrier and a skeleton, 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and ethylenediamine tetraacetic acid are subjected to cross-linking polymerization through polyethylene glycol diacrylate to form a three-dimensional network active matrix, and methacryloyloxyethyl trimethyl ammonium chloride is introduced to provide antibacterial performance. The hydrogel membrane prepared by adopting a cross-linking polymerization-solid solution pouring method has the advantages of large heavy metal ion adsorption capacity, excellent antibacterial property, good mechanical property and the like, and can realize simultaneous and efficient removal of various heavy metal ions such as copper, lead, nickel, cadmium and the like in industrial wastewater and stable operation of the membrane process.

Provided is a method of manufacturing an electrolyte for dye-sensitized solar cells, the method including: preparing a hydrogel membrane; immersing the hydrogel membrane in an electrolyzing solution containing iodine or iodide such that the hydrogel membrane is impregnated with iodide ions; and drying the hydrogel membrane.

The utility model relates to the technical field of automobile protective films, in particular to an anti-scratch self-repairing paint surface protective film which comprises a film base layer and a film surface layer, a release film layer is arranged on one side of the film base layer, and the film surface layer is arranged on the other opposite side of the film base layer; the membrane surface layer comprises a transparent grid layer and a hydrogel membrane, the transparent grid layer is laid on the surface of the membrane base layer, the hydrogel membrane is arranged in each grid of the transparent grid layer, and the hydrogel membranes in the adjacent grids are mutually independent. Compared with the prior art, the anti-scratch self-repairing paint surface protective film provided by the utility model has the advantages that the hydrogel films in the adjacent grids of the transparent grid layer are mutually independent, so that the hydrogel films with scratches in the grids cannot influence the hydrogel films in the surrounding grids; therefore, after scratches are generated on the surface of the protective film, the surface tension of the film around the scratches is not reduced.

The invention discloses a noninvasive blood glucose detection sensor based on anodic aluminum oxide and a preparation method thereof.The sensor comprises a flexible substrate, a first electrode layer, an organic insulating layer and a second electrode layer which are sequentially arranged from bottom to top, and the second electrode layer comprises a plurality of cavities; the cavities extend downwards from the upper surface of the second electrode layer to the upper surface of the first electrode layer, and the cavities are filled with honeycomb-shaped anodic aluminum oxide layers; a patterned third electrode layer is further arranged on the upper surface of the second electrode layer, and a part of the third electrode layer surrounds the upper edge of the cavity; the first electrode layer and the second electrode layer can be externally connected with a cathode and an anode of a constant-voltage power supply respectively; and the first electrode layer, the second electrode layer and the third electrode layer can also be externally connected with a blood glucose detection device. Honeycomb anodized aluminum oxide is used as a detection cavity, the diameter and depth of the cavity can be adjusted, the detection performance of the noninvasive blood glucose detection sensor is improved, and the problem of evaporation of a hydrogel membrane of a traditional device is solved.

The invention relates to the technical field of microbial reactors, in particular to a heating band based on microbial reaction control, which comprises a heating band matrix, the surface of the heating band matrix is provided with a shape memory polymer grid, and magnetostrictive microparticles are embedded in grid nodes. The reaction cabin adopts a bionic honeycomb structure, the first reaction diaphragm and the second reaction diaphragm in the reaction cabin form a unique substance transport and reaction regulation and control system, and the first reaction diaphragm made of a porous nanofiber membrane allows metabolites to pass through and blocks microorganism loss; when the temperature exceeds 40 DEG C, the porosity of the second reaction diaphragm of the temperature-sensitive hydrogel film is suddenly reduced, so that a self-feedback reaction inhibition layer is formed, the reaction rate of microorganisms in the reaction cabin is effectively regulated and controlled, and further heat generation is accurately controlled; the reaction cabins are distributed at equal intervals up and down, so that substances are efficiently and stably conveyed between the reaction cabins, and the uniformity and stability of the reaction in the whole heating belt are ensured.

This application discloses a taratin waste residue hydrogel membrane and its preparation method and application. The method includes: S100, pretreating the taratin waste residue and modifying it using an alkali activation method to obtain modified taratin waste residue; S200, preparing a matrix solution using a water-soluble polymer matrix and adding the modified taratin waste residue to the matrix solution, then dispersing and mechanically stirring to obtain a uniform mixture; S300, pouring the mixture into a mold for spreading and allowing it to stand for 24-48 hours to obtain the taratin waste residue hydrogel membrane. This application uses tannic acid in the taratin waste residue as a crosslinking agent, fully utilizing the active groups in the waste residue to form a multi-site hydrogen-bonded complex hydrogel membrane with polymers, thereby improving the mechanical strength and adsorption performance of the hydrogel membrane; the preparation method is simple, green, and mild.

The invention discloses a preparation method of a composite thermoelectric material based on regenerated nano cellulose, comprising: a, soaking paper in water and washing away impurities, and dispersing after dilution to obtain paper pulp; b, adding TEMPO, NaBr and NaClO into the paper pulp, and adjusting the pH value with sodium hydroxide; c, repeatedly centrifuging and washing the solution obtained in step b, so as to prepare a nano cellulose aqueous solution; d, dispersing SWCNT in an ethanol solvent to obtain a SWCNT suspension; e, mixing the nano cellulose aqueous solution and the SWCNT suspension, and preparing a hydrogel membrane by vacuum filtration; f, freeze drying the hydrogel membrane to obtain a porous regenerated nano cellulose / SWCNT composite aerogel membrane; g, cold pressing the porous regenerated nano cellulose / SWCNT composite aerogel membrane to obtain a regenerated nano cellulose / SWCNT composite aerogel membrane with a microporous structure.