61 results about "Polyacrylamide Hydrogel" patented technology

The invention belongs to the technical field of battery dressings, and particularly relates to a wearable magnesium battery self-powered dressing for chronic wound healing and a preparation method and application thereof. A flexible conductive carbon cloth coated with a viologen-based covalent organic framework material is used as a battery positive electrode, a magnesium sheet is used as a negative electrode, polyacrylamide hydrogel is used as a solid electrolyte, and the flexible wearable self-powered dressing is assembled. The formed electrode can effectively input electrical stimulation to the wound surface, the dressing can simulate an endogenous electric field in the wound, induce migration of fibroblasts, regulate the immune microenvironment of the wound and inhibit inflammatory response, polyacrylamide is used as gel electrolyte, and the dressing has good hygroscopicity, can absorb exudate at the wound surface and keep a wet healing environment, and can be applied to the wound healing. The chronic wound healing of the rat is effectively promoted. The self-powered dressing prepared by the invention provides a reliable electrotherapy method for chronic wound healing.

The invention discloses an N-type gel ionic thermal battery, a quasi-solid gel electrolyte and a preparation method of the quasi-solid gel electrolyte, and belongs to the technical field of thermal regeneration batteries. The preparation method comprises the following steps: fully soaking polyacrylamide hydrogel in an electrolyte containing [Cu (NH3) 2] < + > / [Cu (NH3) 4] < 2 + > redox couple to obtain the quasi-solid gel electrolyte. And preparing the N-type gel ionic thermal battery by using the quasi-solid gel electrolyte. According to the prepared N-type gel ion thermal battery, the thermoelectric conversion performance such as thermoelectric potential and output power is remarkably improved through the synergistic effect of solvated structure entropy change generated by the oxidation-reduction reaction of the copper ammonia complex reaction couple and the quasi-solid gel electrolyte. The problems that research and development of an existing N-type gel ion thermal battery focuses on physical performance regulation and control of a gel matrix, thermoelectric contribution of an oxidation-reduction reaction cannot be effectively enhanced, and improvement of the Seebeck coefficient and the power density is limited can be effectively solved.

The invention discloses a high-heat-power thermoelectric cell hydrogel for low-grade heat energy collection and a preparation method thereof, and belongs to the technical field of heat energy recovery. The polyacrylamide hydrogel is selected as a substrate of the thermoelectric cell hydrogel, so that a hydrogel internal structure which is easy to regulate and control can be obtained; excellent hydrogel stretchability is obtained by using a cross-linking agent and an initiator with relatively low concentration; potassium ferricyanide and potassium ferrocyanide are used as redox ions to generate a thermoelectric effect, so that stable P-type thermal power is obtained; by using guanidine hydrochloride, the solvation entropy difference between potassium ferricyanide and potassium ferrocyanide is enlarged, and the thermal power of the hydrogel in the thermoelectric cell is greatly improved; sodium pyrrolidone carboxylate is used, so that the concentration of ions in the hydrogel is further improved, the conductivity of the thermoelectric cell hydrogel is improved, meanwhile, a hydrogen bond network between water molecules is destroyed, and the water-retaining property of the thermoelectric cell hydrogel is improved.

The invention relates to the field of oil exploitation, in particular to temperature-resistant and salt-resistant efficient gel as well as a preparation method and application thereof, which are used for solving the problems that the efficiency of the gel is influenced and the oil displacement effect is reduced due to poor high temperature resistance and salt resistance and easiness in failure of the existing polyacrylamide hydrogel. According to the preparation method, through a copolymerization technology, various monomers with excellent temperature resistance and salt resistance, such as acrylamide, methacryloyloxyethyl trimethyl ammonium chloride, 2-acrylamido-2-methylpropanesulfonic acid, a temperature-resistant monomer and a hydrophobic macromonomer, are integrated, so that the gel can bear a relatively high temperature without degradation or performance reduction; the prepared oil displacement gel has good stability in a high-salinity environment, does not lose an oil displacement effect due to the existence of salt, ensures the activity and stability of the gel in a high-temperature and high-salt-content oil reservoir environment, and obviously enhances the oil displacement efficiency of the gel in crude oil exploitation, thereby greatly improving the exploitation efficiency and recovery rate of crude oil.

The invention discloses a biconvex crystalline lens organ relying on stiffness-controllable hydrogel external directional induction as well as a construction method and application thereof. A crystalline lens organ model provided by the invention is jointly realized by virtue of stiffness-controllable hydrogel and a composite growth factor; and the pluripotent stem cells are rapidly and directionally induced into crystalline lens organs with high quality in vitro. According to the technical scheme, the method comprises the following steps: (1) directionally inducing and differentiating the pluripotent stem cells into primary ectoderm cell clusters; (2) preparing hydrogel with specific rigidity and carrying out surface cell adhesion treatment; (3) planting the primary ectoderm cells on the cleaned polyacrylamide hydrogel and inducing the primary ectoderm cells into a neural ectoderm cell cluster; and (4) inducing the neural ectoderm cells to directionally differentiate into mature crystalline lens organs. The three-dimensional lens organ-like model obtained by the method has a sphere-like biconvex morphology with a top surface and a bottom surface, is transparent and has structures such as capsule membranes, lens epithelial cells and lens fibrocytes, and the bottom surface is also wrapped by a complete lens capsule membrane. Compared with the prior art, the method realizes the formation of a complete capsule film on the bottom surface and a sphere-like form. The obtained crystalline lens organ can be used for research on crystalline lens embryonic development, research on cataract pathogenesis and research, development and screening of cataract drugs.

The invention belongs to the technical field of flexible electronic materials, and particularly relates to conductive hydrogel with a strain monitoring function and a preparation method and application thereof. The conductive hydrogel with the strain monitoring function, provided by the invention, comprises polyacrylamide hydrogel, MXene nanosheets dispersed in the polyacrylamide hydrogel, and alcohol and water which are filled in the polyacrylamide hydrogel. The conductive hydrogel has high strength and toughness and low hysteresis quality, and can realize high sensitivity and high stability of strain sensing under the condition of not damaging the mechanical properties of the hydrogel.

The invention relates to the technical field of high polymer chemical polymerization, in particular to sodium alginate-based polyacrylamide hydrogel and a preparation method thereof. The sodium alginate-based polyacrylamide hydrogel is prepared from the following components in parts by mass: 10 to 20 parts of acrylamide, 10 to 15 parts of sodium alginate, 3 to 7 parts of modified montmorillonite, 1 to 3 parts of nano titanium dioxide, 0.3 to 0.9 part of anhydrous calcium chloride, 0.1 to 0.5 part of a cross-linking agent, a photoinitiator and tetramethylethylenediamine. The invention provides a sodium alginate-based polyacrylamide hydrogel and a preparation method thereof, and aims to solve the problems of poor mechanical properties and poor heat resistance of sodium alginate-acrylamide composite gel in related technologies.

The invention discloses a roof component based on evaporation and radiation collaborative cooling and preparation and construction thereof. The roof component breaks through the limitation of a single cooling mode through a multi-layer structure coupling evaporative cooling and radiation cooling technology. The reflective film specifically comprises a base layer, an evaporation radiation synergistic cooling material layer and a reflective protection layer. The synergistic material layer is formed by modifying polyacrylamide hydrogel through lithium bromide moisture absorption salt, titanium dioxide nanoparticles are embedded to improve the short-wave reflectivity and long-wave emissivity, and the synergistic material layer has the functions of radiation cooling and moisture absorption evaporation; the reflective protective layer is made of polyvinylidene fluoride-hexafluoropropylene copolymer, so that radiation cooling power is supplemented and pollution is prevented on the premise of moisture permeability; the heat entering a room is reduced by combining an evaporation radiation synergistic cooling material and a reflection protection material; by means of the roof component based on evaporation and radiation collaborative cooling, the limitation of cooling power can be broken through, the cooling effect is enhanced, and the purpose of building energy saving is achieved.

The invention discloses an alkali-activated fly ash rapid gel hole sealing material as well as a preparation method and application thereof, and belongs to the technical field of preparation of flexible hole sealing materials for gas drilling. The invention provides an alkali-activated fly ash rapid gel hole sealing material which is prepared by the following steps: mixing a polyacrylamide hydrogel precursor solution prepared from an acrylamide monomer and a cross-linking agent with fly ash, adding an alkali accelerator and a thermal initiator, and standing. The preparation method comprises the following steps: mixing an acrylamide monomer, deionized water and a cross-linking agent to obtain a polyacrylamide hydrogel precursor solution, and mixing the polyacrylamide hydrogel precursor solution with fly ash to obtain a mixed solution; mixing sodium hydroxide and deionized water to obtain an alkali accelerant; and mixing with the mixed solution, adding a thermal initiator, standing and curing to obtain the rapid gel hole sealing material. The rapid gel hole sealing material prepared by the invention can be rapidly gelated in a short time, and can well permeate into cracks for filling; after gelling, certain obdurability is achieved, deformation is achieved along with the change of the stress effect, and long-term and efficient sealing performance is achieved.

The invention discloses chlorophyll carbon dot-based hydrogel and a preparation method thereof, and belongs to the technical field of hydrogel materials.The chlorophyll carbon dot-based hydrogel is prepared by taking chlorophyll carbon dots as nanofiller and combining the nanofiller with acrylamide (AM) through ultraviolet-induced polymerization reaction, the chlorophyll carbon dots have excellent sp2 crystal nucleuses, and the chlorophyll carbon dots have good biocompatibility and have good biocompatibility. According to the present invention, the carbonized chlorophyll can provide good interfacial interaction (such as pi-pi accumulation, CH-pi and the like) to the material, and the carbonized chlorophyll can well retain the functional group of the carbonized precursor, has good dispersibility, and introduces a large number of physical cross-linking reaction sites to the polyacrylamide hydrogel, such that the hydrogel has ultra-high tensile strength and ultra-high toughness; the hydrogel is simple in preparation process and excellent in performance.

The invention discloses a construction method of an aptamer modified photonic crystal sensor for visually detecting oxytetracycline, and belongs to the technical field of sensing. In the invention, a photonic crystal array obtained by a vertical evaporation self-assembly method is combined with polyacrylamide hydrogel to form the photonic crystal hydrogel membrane material. Gold nanoparticles serve as a bridge, one side of each gold nanoparticle is connected with an amide framework of the hydrogel through chelation, the other side of each gold nanoparticle is connected with the oxytetracycline aptamer through covalent bonding, and the aptamer modified photonic crystal sensor is constructed. The oxytetracycline aptamer and oxytetracycline are highly selectively combined through pi-pi stacking and hydrogen bonds, so that the hydrogel swells, the lattice spacing of the photonic crystal is increased, a reflected signal and a structural color are subjected to red shift, and high-selectivity detection of the oxytetracycline is realized. The rapid detection requirements in the fields of food safety, environment monitoring, biological medicine and the like are met. The linear range of oxytetracycline detection is 0.1 mu g / mL-80 mu g / mL, and the lowest detection limit is 0.033 mu g / mL.

The invention belongs to the technical field of polyacrylamide hydrogel, and discloses rapid temperature-sensitive response polyacrylamide composite hydrogel as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving N-isopropylacrylamide NIPAM, acrylic acid AA, [2-(methylacryloyloxy)-ethyl] dimethyl-(3-sulfopropyl) SBMA, an initiator and a chemical cross-linking agent in an amphiphilic cellulose acetate WSCA solution, mixing and stirring until a uniform and transparent hydrogel precursor solution is formed, and carrying out cross-linking polymerization on the obtained hydrogel precursor solution to obtain the hydrogel. Finally, the polyacrylamide composite hydrogel with rapid temperature-sensitive response is generated, and the polyacrylamide composite hydrogel is marked as the WSCA-PNSA composite temperature-sensitive hydrogel. The composite thermosensitive hydrogel provided by the invention has a phospholipid-like characteristic, so that the PNIPAM hydrogel has high thermosensitive driving force while realizing rapid thermal shrinkage, skin functional recovery can be promoted, and rapid and scar-free wound healing is realized.

The invention discloses ultra-white high borosilicate glass and a preparation method thereof, and belongs to the technical field of borosilicate glass, the ultra-white high borosilicate glass comprises the following raw materials by mass: 70-80 parts of pretreated quartz sand, 10-15 parts of B2O3, 3-5 parts of Al2O3, 1-2 parts of a clarification auxiliary agent and 4-6 parts of Na2O; wherein the pretreated quartz sand is obtained by performing acid leaching and iron ion collecting agent pretreatment on quartz sand; and the iron ion collecting agent is tannic acid / polyacrylamide hydrogel. Iron ions in quartz sand are separated through acid leaching, then the iron ion collecting agent is added, the iron ions in a solution can be effectively adsorbed and fight for, and effective separation of impurity iron is achieved. The iron ion collecting agent is tannic acid / polyacrylamide hydrogel, a stable complex can be formed between the tannic acid / polyacrylamide hydrogel and iron ions, the iron ions can be better attracted and fixed through a cross-linking and branched network of the hydrogel, and therefore the light transmittance of the high borosilicate glass is improved.

The application provides a lateral flow chromatography test paper and application thereof. The lateral flow chromatography test paper comprises a quality control line and an absorption pad. The lateral flow chromatography test paper further comprises an intercept line arranged between the quality control line and the absorption pad, and the material of the intercept line is one or a mixture of two or more of gelatin, carrageenan, polyacrylamide hydrogel, polyacrylic acid hydrogel, polyvinyl alcohol hydrogel or polyvinyl alcohol-sodium alginate hydrogel solution. The lateral flow chromatography test paper can improve the sensitivity of commercial test paper strips, and can be applied to new crown antigen detection, human chorionic gonadotropin detection (HCG) and cardiac troponin detection. The lateral flow chromatography test paper provided by the application can significantly improve the sensitivity by adding a cheap hydrogel intercept line after the quality control line, has good universality, and can be widely applied to various colloidal gold method test paper detection and immunofluorescence test paper detection.

The invention belongs to the technical field of functional three-dimensional composite material preparation, and particularly relates to ion-modified carrageenan-polyacrylamide composite hydrogel and a preparation method thereof.The preparation method comprises the following steps that S1, carrageenan, acrylamide and N, N-dimethylformamide are mixed and stirred to be uniform, and a mixture is obtained; the preparation method comprises the following steps: dispersing and dissolving carrageenan, polyacrylamide, N, N '-methylene bisacrylamide and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methyl propiophenone in deionized water, and heating and stirring until solids are completely dissolved to obtain a carrageenan-polyacrylamide hydrogel prepolymer solution, namely a CA-PAM hydrogel prepolymer solution; s2, transferring the CA-PAM hydrogel pre-polymerized liquid into a watch glass, and refrigerating the CA-PAM hydrogel pre-polymerized liquid in an environment of 4 DEG C until the CA-PAM hydrogel pre-polymerized liquid is solidified to obtain a condensate; s3, irradiating the cured product by using an ultraviolet lamp, so as to prepare carrageenan-polyacrylamide composite hydrogel; s4, the carrageenan-polyacrylamide composite hydrogel is soaked in chlorate solutions with different concentrations respectively, and the ion modified / carrageenan-polyacrylamide composite hydrogel material is prepared.

The invention discloses an ultrahigh-strength carbon material and a preparation method thereof, and belongs to the technical field of carbon materials, and the preparation method comprises the following steps: adding reinforced particles, acrylamide, water-soluble saccharides, N, N '-methylene bisacrylamide, an initiator and a catalyst into deionized water, uniformly mixing, and then sequentially carrying out drying, heat treatment, crushing and ball milling treatment to obtain the ultrahigh-strength carbon material. Composite powder is obtained; the composite powder is sequentially subjected to forming and carbonization treatment, and the ultrahigh-strength carbon material is obtained. By adopting an innovative two-step preparation process, the production process of the graphite block carbon material is remarkably simplified, and the problems of complex process, long production period, high raw material cost, difficulty in controlling the microstructure and the like in the prior art are effectively solved. A strategy of combining a sugar-polyacrylamide hydrogel technology and reinforced particles is utilized, the carbon yield is greatly improved, and carbon loss caused by gas release in a carbonization process is reduced, so that the microstructure of the material is optimized, and the mechanical properties, including key indexes such as compression resistance and bending strength, of the material are improved.

The application discloses a crosslinking agent for degradable hydrogel and a preparation method of degradable polyacrylamide hydrogel based on the crosslinking agent; the crosslinking agent for degradable hydrogel is composed of hydantoin epoxy resin, N, N-dimethyl benzylamine and acrylamide; the degradable polyacrylamide hydrogel prepared by using the crosslinking agent comprises acrylamide, 1.8-4.6 parts of water, potassium persulfate and the crosslinking agent; the crosslinking agent for degradable hydrogel can realize the preparation of the degradable hydrogel by chemical crosslinking method, and by adjusting the crosslinking agent, the degradable hydrogel prepared based on the crosslinking agent is applicable in the temperature environment range of normal temperature to 150 DEG C, the degradable hydrogel has selectivity to gel breaking liquid, and can realize gel breaking only by adding alkaline gel breaking liquid, and the gel breaking time is adjustable in the range of 90 min to 72 h; in addition, the crosslinking agent and the preparation method of the hydrogel are simple, the conditions are easy to control, and have good market application and promotion prospect.

The application discloses a dye-free naked-eye recognizable nucleic acid culture detection counting method, and belongs to the technical field of digital nucleic acid culture. The method comprises the following steps: (1) adding water gel monomers acrylamide and methylene bisacrylamide into a loop-mediated isothermal amplification reaction system of a to-be-detected sample, and initiating crosslinking to form a water gel system; (2) isothermal amplification reaction; (3) after the amplification is completed, a magnesium pyrophosphate precipitate point formed in the water gel system is recognized and counted, and the concentration of target nucleic acid molecules in the to-be-detected sample is calculated. The application combines polyacrylamide water gel and digital LAMP, utilizes the adsorption flocculation capacity of PAM to control the LAMP reaction by-product magnesium pyrophosphate precipitation in the vicinity of a nucleic acid amplification group, forms a white point which has a clear color difference with a background, and the position and size of the white point are basically consistent with those of the nucleic acid amplification group, and thus the dye-free naked-eye recognizable nucleic acid culture counting effect is realized.

The application discloses a PAM-AA-NHS-based multifunctional biomimetic polymer adhesive for wound repair and a preparation method thereof, and belongs to the field of biomaterial preparation and biomedical application. N-hydroxysuccinimide acrylate copolymerized polyacrylamide hydrogel is used as a substrate and as a main chain network, and functionalized materials tannic acid and phenolic hydroxyl chitosan containing o-diphenol groups are introduced, so that effective adhesion can be formed at a biological tissue interface, and cross-linking can be generated with the main chain network through hydrogen bond action to form a secondary network. In addition, aldehyde group-rich oxidized dextran side chains are introduced, which can form Schiff base cross-linking with the main chain network and amino groups in the biological tissue interface to form long-acting adhesion performance. The adhesive has good tissue adhesion, biocompatibility, antibacterial activity and wound healing promotion capacity, can replace sutures, has a positive effect on the formation of new tissues and tissue healing, and is expected to be applied in clinical treatment of wound surfaces.

The invention provides a capsaicin / sodium alginate-polyacrylamide hydrogel modified PDMS antifouling coating, a preparation method and application, and belongs to the technical field of marine antifouling materials, the capsaicin / sodium alginate-polyacrylamide hydrogel modified PDMS antifouling coating comprises hydrogel, natural antifouling agent capsaicin and polydimethylsiloxane, the synthesis process is divided into three steps, and the preparation method is simple. The preparation method comprises the following steps: 1, adding natural capsaicin into the synthesis process of acrylamide hydrogel, 2, mixing a sodium alginate solution with the natural capsaicin to form a precursor solution, and adding an initiator for polymerization, and 3, slowly adding polymerized and dried capsaicin-hydrogel powder into a defoamed PDMS prepolymer mixture; natural capsaicin effectively inhibits the growth of marine fouling organisms, hydrogel is used as a toughening reservoir to continuously release an environment-friendly antifouling agent, the low-surface-energy antifouling effect and synergistic gain are achieved through the polydimethylsiloxane layer, the composite material intervenes into the biological fouling process from multiple aspects, and the composite material jointly deals with the marine organism fouling process.

The present invention discloses a β-cyclodextrin-polyacrylamide hydrogel based on a covalent organic skeleton and its preparation method and application, and belongs to the technical field of organic pollutant treatment. The preparation of the β-cyclodextrin-polyacrylamide / covalent organic skeleton hydrogel in the present invention is to use COF TFPB-BD and acrylamide as raw materials, and under the action of β-CD-MA cross-linking agent, ammonium persulfate (APS) and N,N,N',N'-tetramethylethylenediamine (TEMED), vortex mixing to obtain a prepolymer solution; then the prepolymer solution is dripped into a culture plate, and the polymerization reaction is allowed to stand; then the culture plate is soaked and demoulded to obtain a yellow β-CD-PAAM / TFPB-BD hydrogel; the hydrogel has a high selectivity and removal rate for triazole pesticides, and has good salt resistance, acid resistance, alkali resistance, and is easy to recycle, and has application potential in sewage treatment in extreme environments.

The application discloses a surface double-network composite hydrogel with a three-layer structure similar to a flat worm, which comprises a graphene-containing polyacrylamide hydrogel matrix layer, and a poly-N-isopropyl acrylamide gel network thin layer formed on one side of the graphene-containing polyacrylamide hydrogel matrix layer and a poly-sodium methacrylate gel network thin layer formed on the other side of the graphene-containing polyacrylamide hydrogel matrix layer. The application forms a gel double-network structure with photothermal response and pH response on the surface of the two sides of the matrix gel, which is similar to the body structure of a flat worm in nature, in which the back skin and the belly skin sandwich the body. The application can present different initial shapes by adjusting the pH, so as to endow the application with various photothermal response complex driving modes under different initial shapes, and finally realizes the repeatable programming of the photothermal response complex deformation.

The invention relates to the technical field of batteries, in particular to a coating composition for improving leakage resistance, liquid absorption and discharge performance of a battery and application of the coating composition. The prepared coating composition comprises the following raw materials in percentage by mass: 10%-25% of a methacrylate-acrylamide block copolymer, 10%-15% of polyvinyl alcohol, 40%-53% of starch, 1%-5% of an inorganic-organic composite corrosion inhibitor, 0.5%-2% of a compound surfactant and the balance of water. The invention also provides a preparation method of the coating composition and an application of the coating composition in a zinc-manganese dry battery, and the coating composition is used for preparing coated paper so as to improve the leakage resistance, liquid absorption and discharge performance of the battery. According to the invention, the methacrylate monomer is introduced into the traditional polyacrylamide hydrogel polymerization process, so that the liquid absorption amount and the liquid absorption rate are remarkably improved, the leakage resistance of the battery is improved, the liquid absorption amount is doubled, the discharge time is prolonged by 10%, and the retention rate reaches 95% or more after the battery is naturally stored for half a year.

The application discloses a programmable deformation and oxygen production magnetic driving soft robot and a preparation method thereof, and belongs to the technical field of composite materials and photocatalysis. Hard magnetic particles (T-NdFeB) with surface modification are compounded into kappa-carrageenan / polyacrylamide (KC / PAm) hydrogel through a free radical polymerization process to obtain a magnetic driving module. The modules are flexibly assembled into a soft robot with complex geometric shape and magnetization distribution by using a self-healing process between the modules, so that the soft robot can realize various programmable deformations. In addition, a Ru-Bi2CrO6 photocatalyst is obtained by doping Ru elements in Bi2CrO6, and is compounded into the KC / PAm hydrogel to construct a functional module capable of producing oxygen. The magnetic driving module and the functional module are further assembled into a magnetic oxygen production soft robot, so that the purpose of stably and flexibly supplying oxygen to a water environment is achieved.

A polyacrylamide-based aerogel may be an efficient solar vapor generation device. Internal pores of the polyacrylamide-based aerogel may provide capillary forces while elongated surface channels provide a transport force in response to the polyacrylamide-based aerogel contacting liquid. The polyacrylamide-based aerogel may be formed from a photocurable resin doped with reduced graphene oxide particles. The photocurable resin may be printed in layers in a micro continuous liquid interface projection process to form a polyacrylamide-based hydrogel. The polyacrylamide-based hydrogel may be immersed in water to form a swollen hydrogel structure. The swollen hydrogel structure may be frozen. The frozen hydrogel structure may be dried to form a polyacrylamide-based aerogel structure.

The invention discloses a programmable deformation and oxygen production magnetic drive soft robot and a preparation method thereof, and belongs to the technical field of composite materials and photocatalysis. And compounding hard magnetic particles (T-NdFeB) of which the surfaces are modified into kappa-carrageenan / polyacrylamide (KC / PAm) hydrogel through a free radical polymerization process to obtain the magnetic driving module. And the modules are flexibly assembled into a soft robot with a complex geometrical shape and magnetization distribution by utilizing a self-healing process among the modules, so that the soft robot can realize various programmable deformations. In addition, a Ru-Bi2CrO6 photocatalyst is obtained by doping a Ru element into Bi2CrO6, the Ru-Bi2CrO6 photocatalyst is compounded into KC / PAm hydrogel to construct a functional module capable of generating oxygen, the functional module and a magnetic driving module are further assembled into a magnetic oxygen-generating soft robot, and the purpose of stably and flexibly supplying oxygen to a water environment is achieved.

The present invention discloses an ultra-high-strength carbon material and a preparation method thereof, which belongs to the field of carbon material technology. The preparation method comprises the following steps: reinforcing particles, acrylamide, water-soluble sugars, N,N'-methylenebisacrylamide, an initiator and a catalyst are added to deionized water and mixed evenly, and then dried, heat-treated, crushed and ball-milled in sequence to obtain a composite powder; the composite powder is molded and carbonized in sequence to obtain the ultra-high-strength carbon material. The present invention significantly simplifies the production process of graphite block carbon materials by adopting an innovative two-step preparation process, and effectively overcomes the problems of complex process, long production cycle, high raw material cost and difficult control of microstructure in the prior art. The strategy of combining sugar-polyacrylamide hydrogel technology with reinforcing particles is used to greatly improve the carbon yield and reduce the carbon loss caused by gas release during the carbonization process, thereby optimizing the microstructure of the material and improving its mechanical properties, including key indicators such as compressive and flexural strength.

The invention discloses a color-changing indicating adsorption heat storage composite material and a preparation method thereof. The composite material comprises polypropylene acrylamide hydrogel, ionic liquid and a cobalt chloride color-changing indicating agent. The preparation process comprises the following steps: firstly, adding cobalt chloride into a polyacrylamide precursor; then gelatinizing at a certain temperature to synthesize the indicating discoloration polyacrylamide hydrogel; preparing an ionic liquid into an ionic liquid aqueous solution, and dipping the ionic liquid aqueous solution into the polyacrylamide hydrogel to prepare a final product. The product prepared by the invention has the performance of indicating discoloration, displays pink after absorbing water and is blue black after high-temperature desorption, plays a monitoring role, and avoids invalid work of an adsorption heat storage material. The material has high adsorption capacity and high heat storage density, and has important significance in the field of adsorption heat storage.

A preparation method of a nanofiber membrane with multiple response stimuli comprises the following steps: firstly dissolving MXene powder and PVDF in a DMF solution, then heating and stirring to obtain a uniform black mixed solution, and then spinning the black mixed solution through an electrostatic spinning process to prepare a PVDF-MXene nanofiber membrane; the preparation method comprises the following steps: dissolving an acrylamide monomer and an initiator in a silane cross-linking agent solution, stirring at normal temperature until the solution is in a semitransparent state to obtain a hydrogel solution, and introducing nitrogen into the hydrogel solution to obtain polyacrylamide hydrogel; the preparation method comprises the following steps: preparing polyacrylamide hydrogel into a PAM hydrogel nanofiber film through an electrostatic spinning process, and compounding a PVDF-MXene nanofiber film with the PAM hydrogel nanofiber film to obtain the Janus nanofiber film with a double-layer structure. The material can respond to multiple stimuli, and the stability is good through chemical bond connection.

The invention provides a cell culture model for simulating a Bruch membrane-choroid complex in vitro and a construction method of the cell culture model. The model is composed of polyacrylamide hydrogel coated by type I collagen and having different rigidities, can be used for researching the influence of BMCC rigidity change on retinal pigment epithelium (RPE) cells, explores the pathogenesis of RPE layer structure dysfunction caused by BMCC mechanical property change, and can be used for screening drugs for treating related diseases. Compared with a traditional 2D RPE cell line culture model, the model can better simulate the physiological and pathological process of in-vivo RPE cells when the mechanical microenvironment is changed, and convenience is provided for studying the effect of mechanical signals in RPE structure dysfunction. The rigidity of the variable-rigidity polyacrylamide hydrogel provided by the invention is changed by adjusting the ratio of the monomer to the cross-linking agent, and the environment in which RPE cells are located is simulated through I-type collagen coating, so that the variable-rigidity polyacrylamide hydrogel has the characteristics of high simulation property, high biological safety and the like.