47 results about "Hydrogel membrane" patented technology

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.

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.

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.

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.

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 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 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 belongs to the technical field of hydrogel-based ion selective membranes, and particularly discloses a cation selective permeable hydrogel membrane as well as a preparation method and application thereof. A plurality of pore channels penetrating from top to bottom are distributed in a hydrogel film, the pore channels are tightly arranged, and any two adjacent pore channels share the same side wall to form a three-dimensional honeycomb structure; the inner surfaces of the pore channels are loaded with uniform and dense negative charge organic groups, and the pore channels are filled with water. The preparation method of the hydrogel film comprises the following steps: preparing a precursor solution, carrying out primary light-induced curing on the precursor solution to generate a hydrogel film semi-finished product, standing in situ to fully swell the hydrogel film semi-finished product, and carrying out secondary light-induced curing on the swelled hydrogel film semi-finished product. The invention provides a novel structure hydrogel film with high surface charge density and a long-range ordered vertical pore channel honeycomb structure, and the hydrogel film has excellent cation selectivity, rapid ion transmission capability and stable mechanical properties, and has wide application prospects.

This invention belongs to the field of biopolymer materials technology, specifically relating to a gelatin-based hydrogel membrane, its preparation method, and its applications. The gelatin-based hydrogel membrane is prepared from gelatin, bovine serum albumin (BSA), a crosslinking agent, and water, with a mass ratio of gelatin, BSA, and crosslinking agent of 2-5:0.5-5:0.05-1. The gelatin is either type A or type B gelatin. Type A gelatin has a gel strength of 100-500 gBloom. The crosslinking agent is one or more of glutaraldehyde, formaldehyde, genipin, and methacrylamide. The gelatin-based hydrogel membrane prepared by this invention is a solid film with both excellent mechanical properties and good biocompatibility.

The invention provides a nitrogen-doped graphene filter membrane for removing phenolic pollutants and a preparation method thereof, and the preparation method comprises the following steps: adding graphene oxide into deionized water, and uniformly mixing to obtain a graphene oxide aqueous dispersion solution; performing ultrasonic treatment on the graphene oxide aqueous dispersion solution, adding a hydrazine hydrate solution into the graphene oxide aqueous dispersion solution after the ultrasonic treatment is completed, and performing hydrothermal reaction to obtain nitrogen-doped graphene hydrogel after the reaction is completed; and washing the nitrogen-doped graphene hydrogel with water, carrying out suction filtration, and loading the nitrogen-doped graphene hydrogel on a microporous filter membrane to obtain the nitrogen-doped graphene filter membrane. The nitrogen-doped graphene filter membrane for removing the phenolic pollutants has stronger adsorption and catalysis synergism, the hydrogel membrane prepared from the graphene oxide dispersion liquid with the concentration of 3 mg / mL has the pore diameter in a mesoporous-macroporous composite interval, bisphenol A (BPA) is efficiently adsorbed, a smooth channel is provided for diffusion of peroxydisulfate (PDS), and the nitrogen-doped graphene filter membrane can be used for removing the phenolic pollutants, so that the service life of the nitrogen-doped graphene filter membrane is prolonged, and the service life of the nitrogen-doped graphene filter membrane is prolonged. And the near-layer concentration of the BPA at the active site is greatly improved.

This invention belongs to the field of water treatment membrane material technology, and more specifically relates to a high-strength SA-based hydrogel membrane and its preparation method based on a two-level pore-forming strategy and dual-nano synergistic reinforcement. This invention introduces CNF as a three-dimensional interpenetrating network framework, utilizing its high aspect ratio to construct a "steel bar"-like support structure within the membrane; simultaneously, GO is introduced as a two-dimensional interface enhancer, utilizing the abundant oxygen-containing functional groups in GO sheets to form strong hydrogen bonds between the SA matrix and the CNF framework, solving the problem of weak interfacial bonding between one-dimensional fibers and the polymer matrix. Based on this, this invention employs a two-level pore-forming strategy, utilizing the synergistic occupancy and elution of small-molecule PEG and large-molecule PEG to construct a hierarchical pore structure of macroporous water transport and microporous sieving, breaking the trade-off effect of traditional membrane material flux and retention rate.

The invention belongs to the technical field of hydrogel-based ion selective membranes, and particularly discloses a high-toughness self-repairing cation selective hydrogel membrane as well as a preparation method and application thereof. I) a three-dimensional network formed by cross-linking polymerization of a carboxylic acid group-containing monomer and a sulfonic acid group-containing monomer in the presence of a cross-linking agent is distributed in the hydrogel film; ii) a high-molecular polymer chain which is selected from any one or a combination of more than two of poly (sodium 4-styrenesulfonate), poly (2-acrylamide-2-methyl-1-propanesulfonic acid), polyvinyl alcohol or polyethylene glycol; and iii) an ion transport medium, which comprises 1-ethyl-3-methylimidazole ethyl sulfate and water, the three-dimensional network and the high-molecular polymer chain are interpenetrated and wound to form an interpenetrating network structure; and the interpenetrating network structure is filled with an ion transmission medium. The hydrogel film has excellent cation selectivity, high toughness and self-repairing performance, is easy to prepare and can be applied to high-performance permeation energy conversion.

To provide a microcapsule production method enabling easy control of particle diameters and a microcapsule production apparatus that allows easy manufacture of microcapsules adjusted to a desired particle size range.SOLUTION: A method for producing microcapsules comprises: a step of growing a droplet of a first solution while keeping it in contact with a discharge port of a discharge head that holds the first solution, while controlling the distance between the discharge port and the liquid surface of a second solution stored in a storage section; and a step of contacting the droplet with the second solution without scattering, thereby forming a microcapsule covered with a hydrogel membrane, wherein the first solution contains a first substrate and the second solution contains a second substrate that reacts with the first substrate to form a hydrogel.SELECTED DRAWING: Figure 2

The invention discloses a CMC (Carboxymethyl Cellulose) / PVA (Polyvinyl Alcohol) nanofluid hydrogel membrane. The CMC / PVA nanofluid hydrogel membrane is prepared by soaking citric acid cross-linked CMC / PVA hydrogel in a structure promoting ionic salt solution. The invention also provides a method for preparing the CMC / PVA nanofluid hydrogel membrane and application of the CMC / PVA nanofluid hydrogel membrane in osmotic energy conversion. The high-performance nanofluid hydrogel membrane forms a compact dual-crosslinked network, presents a high-charge nanopore structure, has significantly improved power density when applied to osmotic energy conversion, has excellent tensile strength, realizes rapid ion transmission and excellent cation selectivity, and can be used in the field of osmotic energy conversion. Meanwhile, the energy can be effectively dissipated by remarkably improving the mechanical strength.

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.

The present invention relates to a self-healing covalent organic framework-based composite membrane, its preparation method and application. By dehydrating boric acid with the hydroxyl groups on polyvinyl alcohol, a boron-crosslinked PVA / KCl hydrogel membrane is obtained; then the covalent organic framework is composited onto the boron-crosslinked PVA / KCl hydrogel membrane by in-situ polymerization growth. Based on the designability of the COFs structure and the high toughness of the hydrogel membrane, the application of the self-healing covalent organic framework-based composite membrane in supercapacitors not only achieves excellent electrochemical performance, but also exhibits excellent toughness, strength and self-healing behavior under strong mechanical deformations such as stretching or bending, and has good application prospects.

The invention belongs to the technical field of wound dressings, and particularly relates to enzyme-mimetic hydroxyapatite, a wound dressing as well as a preparation method and application of the enzyme-mimetic hydroxyapatite and the wound dressing. According to the invention, enzymatic active carbon dot functionalized hydroxyapatite is prepared by a one-step hydrothermal method, and collagen stimulation activity of hydroxyapatite is combined with multi-enzyme activity of enzymatic active carbon dots. By embedding the enzyme-like hydroxyapatite into the bionic bi-crosslinking silk fibroin hydrogel film, the wound dressing with good flexibility and adhesion is prepared, and the wound dressing has excellent active oxygen removal and immune regulation functions. Researches prove that the dressing can utilize matrix reconstruction and enzymatic active oxygen removal to synergistically aim at oxidative stress, inflammation and extracellular matrix disorder, and a potential new treatment direction is provided for repair of various wounds including chronic diabetes wounds.