527 results about "Porous network" patented technology

The invention belongs to the technical field of seawater desalination, and particularly relates to a solar efficient photo-thermal conversion type floating ball and seawater evaporation application thereof. Specifically, the solar efficient photo-thermal conversion type floating ball comprises a spherical inner core and a photo-thermal conversion material wrapping the spherical inner core, and the density of the spherical inner core is 25-500 kg / m < 3 >; wherein the photo-thermal conversion material is coated at least twice. According to the solar efficient photo-thermal conversion type floating ball, the photo-thermal conversion material is coated at least twice, the loading capacity is improved, meanwhile, a porous network structure is formed, and the seawater evaporation rate can be increased; sunlight irradiates on the floating ball, light energy is converted into heat energy under the action of the surface photo-thermal conversion material, salt is deposited on the floating ball along with water evaporation, and surface salt deposition is automatically and dynamically removed through the free rotating motion of the floating ball on the water surface under the action of centrifugal force and water flow scouring. And self-recovery of the evaporation process and continuous seawater evaporation are realized.

The invention relates to the technical field of sole processing, in particular to a sole composite processing method, which comprises the following steps: according to the rigidity requirement of an arch support area, preparing high-density slurry in which silicon nitride ceramic powder accounts for 30-40%, forming # imgabs0 # crystal phase through microwave-assisted sintering, and controlling the porosity to be 10-20%; according to the energy rebound requirement of the forefoot buffer area, graphene oxide / carboxymethyl cellulose aerogel powder is added into the slurry until the concentration is 25%, and the porosity is increased to 40-60% by combining the honeycomb porous network design; a nano silicon dioxide reinforcing agent is introduced into a wear-resistant area of the heel to 15%, a diamond-like carbon coating is formed through plasma surface treatment, and the porosity is limited to be 5-15%. According to the invention, silane is encapsulated by adopting polyurea microcapsules, and is released only when the material is damaged, so that dynamic self-repairing is realized, the shoe sole is endowed with dynamic repairing capability, and the service life is prolonged.

The invention relates to a liquid metal / MXene / sodium alginate / polyacrylamide composite hydrogel material as well as a preparation method and application thereof. The hydrogel material comprises liquid metal microspheres, a hierarchical porous network formed by sodium alginate and polyacrylamide, and flaky MXene. The preparation method comprises the following steps: S1, adding liquid metal into an aqueous solution, and carrying out ultrasonic dispersion to obtain dispersion liquid; s2, adding the dispersion liquid into a sodium alginate solution, and performing ultrasonic treatment to obtain a sodium alginate-coated liquid metal aqueous solution; s3, acrylamide is dissolved in deionized water, then the aqueous solution of the liquid metal wrapped by sodium alginate is added, then a cross-linking agent, an initiator and MXene are added, and the mixture is stirred to be uniform; and S4, pouring into a mold, and heating to form the hydrogel. The composite hydrogel material prepared by the invention has the advantages of high stretch rate, strong electromagnetic shielding performance and the like, and can be used as electronic skin for electromagnetic shielding, human health monitoring, man-machine communication and soft robots.

The invention discloses a hydrogen evolution electrode for an AEM electrolytic cell cathode and a preparation method thereof, the electrode sequentially comprises a substrate net, a metal bottom layer and a catalyst layer, the substrate net is selected from a stainless steel net or a nickel net, the metal bottom layer is formed on the substrate net through physical vapor deposition, and the material is selected from Ni, Ti, alloys thereof or oxides thereof; the catalytic layer is deposited on the metal bottom layer through physical vapor deposition and sequentially comprises a catalytic bottom layer, a catalytic middle layer and a catalytic outer layer, and the porosity is gradually increased. The preparation method comprises the following steps: roughening the acid etching surface of a substrate net, forming a metal bottom layer on the substrate net through physical vapor deposition, sequentially forming a catalytic bottom layer, a catalytic middle layer and a catalytic outer layer on the surface of the metal bottom layer through physical vapor deposition to obtain a catalytic layer, and performing post-treatment on the catalytic layer through plasmas doped with elements to form a porous network structure. And the corrosion resistance and the catalytic effect of the AEM electrolytic cell cathode in an alkaline environment are greatly improved.

The invention discloses polyelectrolyte carbon-based hydrogel as well as a preparation method and application thereof. The polyelectrolyte carbon-based hydrogel has an ordered orientation three-dimensional porous network structure formed by crosslinking of water-soluble gel, polyelectrolyte and nanocarbon. The preparation method comprises the following steps: uniformly mixing water-soluble gel, water and a nano carbon material to obtain a first mixed solution; uniformly mixing polyelectrolyte with the first mixed solution to obtain a second mixed solution, and adjusting the pH value; mixing the second mixed solution and a cross-linking agent, and performing directional freezing casting to obtain frozen nano composite gel; and performing freeze drying on the frozen nano carbon composite gel to obtain polyelectrolyte carbon-based aerogel, and soaking the polyelectrolyte carbon-based aerogel in water to obtain the polyelectrolyte carbon-based hydrogel. The porous structure of the hydrogel is effectively regulated and controlled in the directional freezing casting process through the polyelectrolyte, and the polyelectrolyte carbon-based hydrogel has a small-pore hierarchical pore structure, has high photo-thermal conversion and light absorption capacity and can be applied to the field of photo-thermal water evaporation purification.

The invention belongs to the technical field of hydrogen production, and particularly relates to an electric heating catalyst and an electric heating catalytic ammonia decomposition hydrogen production system. The electrothermal catalyst comprises a catalyst component and a foam alloy electrode, wherein the catalyst component comprises an active metal, a carrier metal oxide and an auxiliary metal oxide; the interior of the foam alloy electrode is of a porous network structure, the catalyst components are uniformly distributed on the outer surface of the foam alloy electrode and the inner wall of the porous network structure, and the thickness of the catalyst components distributed on the outer surface of the foam alloy electrode and the thickness of the inner wall of the porous network structure are both 5-10 microns. The foam alloy electrode is used as a heating unit and a carrier for catalyst growth, catalyst forming is not needed, good heat transfer and mass transfer efficiency is achieved, meanwhile, the electro-thermal catalytic bed design of multiple sections of bed layers is combined, temperature subsection control of the multiple sections of bed layers is achieved, the optimal reaction conditions can be kept at different reaction stages, and the reaction efficiency is improved. Therefore, the reaction efficiency is obviously improved.

The invention belongs to the technical field of functional composite fibers, and discloses a wear-resistant nanofiber-reinforced protective graphene fiber and a preparation method and application thereof.The wear-resistant nanofiber-reinforced protective graphene fiber comprises a graphene fiber tow and nanofibers, the nanofibers coat the graphene fiber tow in a three-dimensional porous network mode, and the nanofibers coat the graphene fiber tow in a three-dimensional porous network mode. Forming a stress buffer layer; wear-resistant particles are uniformly loaded in the three-dimensional porous network; the preparation method comprises the following steps: fixing the graphene fibers subjected to surface pretreatment on an electrostatic spinning nano-yarn machine, forming a nano-fiber membrane by utilizing electrostatic spinning, uniformly wrapping the graphene fibers subjected to surface pretreatment with the nano-fiber membrane, then rolling into a shaft, and then carrying out hot-pressing roller treatment on the rolled fiber bundle, so as to obtain the graphene nano-yarn. The wear-resistant nanofiber reinforced protective graphene fiber is prepared; the graphene fiber is used for weaving to obtain the graphene fiber fabric. The fiber prepared by the invention and a fabric woven by using the fiber have excellent mechanical properties, wear resistance, electric conductivity and heat conductivity.

The invention relates to the technical field of electrode materials, and discloses a preparation method of a lithium iron manganese phosphate material and a lithium ion battery. The lithium iron manganese phosphate material is prepared by the following steps: performing in-situ growth in a cavity of polyethylene glycol-sucrose hybrid aerogel with a three-dimensional porous network structure to form a manganese iron phosphate precursor; the hybrid aerogel can control excessive agglomeration and disordered growth of ferromanganese phosphate precursor particles and avoid particle agglomeration, so that the finally formed lithium ferromanganese phosphate material particles are finer and more uniformly distributed, and an amorphous carbon-aluminum layer is formed during later calcination, so that the performance of the material is improved. The surface of lithium manganese iron phosphate particles is tightly coated with the composite material, electron transmission can be accelerated, particle pulverization can be reduced, meanwhile, corrosion of corrosive components in electrolyte can be inhibited, interface side reactions such as transition metal ion dissolution can be reduced, and finally the conductivity and cycling stability of the lithium ion battery are remarkably improved.

The invention relates to the technical field of functional polymer composite materials, and provides diatomite modified composite super absorbent and rapid absorbent resin and a preparation method thereof. The preparation raw materials of the diatomite modified composite high-water-absorption and rapid-water-absorption resin provided by the invention comprise acrylic acid, acrylamide, sodium hydroxide, N, N '-methylene bisacrylamide, ammonium persulfate and modified diatomite. The diatomite is modified by the silane coupling agent, the agglomeration problem of the diatomite is solved, the compatibility with organic monomers is improved, and the modified diatomite, acrylic acid and acrylamide are utilized to construct an organic-inorganic synergistic three-dimensional porous network structure, so that the resin has ultrahigh water absorption rate, rapid water absorption performance and good water retention stability. Meanwhile, the preparation method disclosed by the invention does not need nitrogen protection, has the advantages of simple process, controllable raw material cost and easiness in industrial mass production, and is suitable for multiple fields such as water-saving agriculture, soil moisturizing, landscaping and the like.

The embodiment of the invention provides an energy storage device with conductive polymer sponge and an intelligent monitoring system of the energy storage device, and belongs to the field of electrochemistry, the energy storage device comprises a shell, and an electrode assembly, electrolyte and a current collector which are arranged in the shell; the electrode assembly comprises a positive electrode, a negative electrode and a diaphragm arranged between the positive electrode and the negative electrode, and the positive electrode and the negative electrode are composite electrodes of conductive polymer sponge; the conductive polymer sponge is a polymer sponge which is prepared through an in-situ chemical oxidation polymerization technology and has a porous network, and the energy storage device further comprises a control system used for controlling the operation state of the energy storage device. According to the embodiment of the invention, the polymer sponge with a highly interconnected porous network is prepared through an in-situ chemical oxidation polymerization technology on the basis of a unique microstructure of the conductive polymer sponge, and the three-dimensional structure of the polymer sponge increases the effective surface area of an electrode and improves electrochemical reaction active sites, so that more efficient charge transmission and storage are realized.

The invention provides a wear-resistant super-hydrophobic coating and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a porous structure coating which comprises a dispersion liquid of a micron-scale filler, resin and an auxiliary agent; (2) spraying the porous structure coating prepared in the step (1) on the surface of a base material by using a spraying technology to construct a stone-like paint or honeycomb-like firm porous network structure framework; (3) preparing a hydrophobic modified nanoparticle dispersion liquid; and (4) a hydrophobic modified nanoparticle dispersion liquid is sprayed on the porous network structure framework by using a spraying technology, the nanoparticles are embedded into the porous network structure framework, and the water contact angle of the composite coating is 158 degrees. The composite coating has high mechanical strength and excellent super-hydrophobic performance, and is endowed with wide application prospects.

A polyethylene terephthalate aerogel. There is provided a polyethylene terephthalate (PET) aerogel comprising a porous network of cross-linked recycled PET fibers, wherein the PET aerogel has a thermal conductivity of 0.030-0.050 W / m K. There is also provided a method of forming the PET aerogel.

The preparation method comprises the following steps: mixing a catalyst, a pore forming agent, an ionomer and a solvent, carrying out ultrasonic treatment in an ice-water bath until the mixture is uniformly dispersed, then coating a polytetrafluoroethylene membrane with the mixture to obtain a catalytic layer, and then carrying out hot pressing and transferring the catalytic layer to two sides of a proton exchange membrane to obtain the membrane electrode. The catalyst layer of the prepared membrane electrode has a cross-linked porous network structure formed in situ when the pore forming agent is pyrolyzed and separated in the hot-pressing transfer printing process, so that the specific surface area of a three-phase interface and the utilization rate of a noble metal catalyst are increased, the gas and liquid mass transfer resistance of the membrane electrode is reduced, and the material transmission capability is improved; the performance of the membrane electrode is improved, and the membrane electrode has more excellent stability.

The invention relates to the technical field of flexible sensors, in particular to a gradient hierarchical porous structure flexible piezoresistive sensor and a preparation method thereof. The sensor is of a laminated structure and comprises an upper flexible packaging protection layer, a lower flexible packaging protection layer, a conductive fabric electrode and a middle piezoresistive sensing layer, and a limiting frame is arranged on the periphery of the sensor. The sensing layer is prepared by adopting a 3D printing ink direct writing technology, and adopted printing slurry takes silicone rubber as a matrix and is uniformly mixed with expanded conductive microspheres and conductive filler. The printing wires are stacked in order to form a macroscopic gradient porous network structure; after the expanded microspheres are subjected to in-situ foaming, micro closed pores are formed in the material, and a rough microstructure is constructed on the surface of the wire material, so that hierarchical multi-scale regulation and control of a conductive network are realized cooperatively, contact sites are increased remarkably, and the sensitivity of the sensor is further improved effectively. The flexible piezoresistive sensor prepared by the invention has the advantages of high sensitivity, wide pressure detection range and high linearity, and has the commercial values of simple preparation process, high repeatability, lower cost and the like.

The present invention belongs to the technical field of functional composite fibers, and discloses a wear-resistant nanofiber-reinforced and protected graphene fiber, a preparation method thereof and an application. The wear-resistant nanofiber-reinforced and protected graphene fiber comprises a graphene fiber bundle and nanofibers. The nanofibers coat the graphene fiber bundle in the form of a three-dimensional porous network to form a stress buffer layer; wear-resistant particles are uniformly loaded inside the three-dimensional porous network. The preparation method is as follows: fixing the surface-pretreated graphene fiber on an electrospinning nanofiber yarn machine, forming a nanofiber membrane by electrospinning and uniformly wrapping it on the surface-pretreated graphene fiber, then winding it into a roll, and then performing a hot roll treatment on the wound fiber bundle to obtain the wear-resistant nanofiber-reinforced and protected graphene fiber. The application is: used for weaving to obtain a graphene fiber fabric. The fiber prepared by the present invention and the fabric woven therefrom have excellent mechanical properties, wear resistance, electrical conductivity and thermal conductivity at the same time.

The invention relates to a membrane electrode and application thereof in deuterium-enriched water, and belongs to the field of clean energy development and utilization. The membrane electrode comprises a proton exchange membrane, an anode catalyst and a cathode catalyst, the anode catalyst is an iridium / iridium oxide catalyst with a three-dimensional porous network structure, and the cathode catalyst is a platinum-ruthenium alloy catalyst. The preparation method comprises the following steps: coating one side of the N117 proton exchange membrane with the anode catalyst, coating the other side of the N117 proton exchange membrane with the cathode catalyst, and then performing hot pressing to prepare the membrane electrode. The method comprises the following steps: assembling a membrane electrode into an electrolytic cell, and electrolyzing water by using the electrolytic cell to realize deuterium enrichment. The membrane electrode and the electrolytic cell are reasonable in design, the preparation process is simple and controllable, and the obtained product is high in efficiency and long in service life when used for enriching deuterium and facilitates industrial application.

The invention provides a composite hydrogel for infectious bone defect repair and a preparation method thereof, and belongs to the technical field of bone defect repair, the composite hydrogel comprises a three-dimensional porous network structure hydrogel and a bioactive unit, and the bioactive unit is loaded in the three-dimensional porous network structure hydrogel; the hydrogel with the three-dimensional porous network structure is prepared from photo-crosslinked methacrylated silk fibroin and nano-hydroxyapatite; the bioactive unit comprises a strontium metal organic framework loaded with curcumin. According to the invention, the photo-crosslinked methacrylated silk fibroin provides excellent biocompatibility; as an ion / drug dual carrier, the strontium metal organic framework can continuously release strontium ions and bidirectionally regulate bone metabolism (promoting osteogenesis and inhibiting osteoclast), and the porous structure of the strontium metal organic framework can efficiently load a hydrophobic drug curcumin (Cur). Curcumin has strong antibacterial and anti-inflammatory functions; the nano-hydroxyapatite can obviously enhance the mechanical strength of the hydrogel.

The invention provides a sodium ion battery capacitor and a preparation method thereof. The sodium-ion battery capacitor comprises a positive pole piece, a negative pole piece, a diaphragm and an electrolyte, the positive pole piece comprises a composite positive pole material, and the composite positive pole material comprises a capacitive material and a layered oxide; the negative electrode plate comprises a composite negative electrode material, and the composite negative electrode material comprises hard carbon and a surface functional group modified porous carbon nanotube. The capacitive material and the layered oxide are synergistically matched to serve as the composite positive electrode material, a three-dimensional porous network structure is formed, and the synergistic effect of the double-electrode-layer capacity and the oxidation-reduction reaction can be improved; the hard carbon and the surface functional group modified porous carbon nanotube are synergistically matched to serve as the composite negative electrode material, so that the sodium ion diffusion path, the electrolyte infiltration area and the charge-discharge efficiency are favorably optimized, and the sodium ion adsorption capacity is improved. The sodium ion battery capacitor has the characteristics of high energy density, high power density, wide temperature range charging and discharging capability and the like.

The invention provides a porous composite solid electrolyte membrane as well as a preparation method and application thereof, and belongs to the technical field of solid electrolyte materials. According to the porous composite solid-state electrolyte membrane provided by the invention, the three-dimensional porous fiber membrane constructed by the modified nanofibers is used as a framework of the porous composite solid-state electrolyte membrane, so that the interface bonding capacity of the modified nanofibers, the inorganic solid-state electrolyte powder and the membrane-forming polymer can be improved; further, the porous composite solid electrolyte membrane has excellent mechanical properties such as flexibility; the inorganic solid electrolyte powder is uniformly dispersed in the three-dimensional porous fiber membrane, the porous network structure can provide more lithium ion transmission channels, the ion migration rate is improved, and the conductivity of the porous composite solid electrolyte membrane is improved; the porous composite solid-state electrolyte membrane provided by the invention comprises the flame-retardant plasticizer, and the membrane-forming polymer and the flame-retardant plasticizer are compounded to improve interface contact, so that the mechanical property of the porous composite solid-state electrolyte membrane is improved.

The invention discloses a long-acting analgesic compound as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a mixed solution containing a polymer, a local anesthetic, a non-steroidal anti-inflammatory drug and a solvent into drug-loaded microspheres through an electrostatic spraying technology; the preparation method comprises the following steps: dissolving poloxamer and a natural polymer material in water to obtain a hydrogel solution; and uniformly mixing the drug-loaded microspheres and a hydrogel solution to prepare the long-acting analgesic compound. The long-acting analgesic compound comprises drug-loaded microspheres and hydrogel, the long-acting analgesic compound and the hydrogel are both of a three-dimensional porous network structure, the drug-loaded microspheres are evenly dispersed in the hydrogel, and the drug-loaded microspheres are of a solid spherical structure. The advantages of electrostatic spraying microspheres and hydrogel are combined, the preparation method is mild in condition and simple in process, and the preparation process is non-toxic and harmless; the long-acting analgesic compound has the advantages of thermosensitivity, injectability, high drug loading rate and the like, and can be effectively applied to preparation of analgesic products.

Porous-based bone implants with the integration of Triply Periodic Minimal Surface, TPMS, porous architectures are designed to support the growth and proliferation of bone tissue, bone marrow, and capillaries. This disclosure intends to reduce the adverse effect of conventional implants such as bone resorption over time, which is called the “stress shielding effect”. The “stress shielding effect” is caused by the mismatch between the implant and natural bone stiffness. Triply Periodic Minimal Surface, TPMS, porous architectures exhibit interconnected pore features. The interconnection of the porous network allows the TPMS to have a higher permeability than that of other porous structures, leading to more favorable nutrient transport. In addition, many physical characteristics of the TPMS structures including surface-to-volume ratio, pore size, elastic modulus, and fluid behaviors can be controlled precisely through mathematical manipulation. As a result, TPMS-based implants could be physical features, which are vaned based on different bone regions. In other words, the medical implants may exhibit non-uniform or gradient physical features, which can match the characteristic of trabecular and cortical bones. Therefore, TPMS-based implants could adjust the features to mimic neighboring bone regions. As a result, we can achieve medical implants, which have superior mechanical and biological responses, resulting in optimal cell growth and better medical treatment.

The invention relates to the technical field of marine ecological engineering, in particular to a marine coral reef ecological restoration method based on a foamed aluminum base material, which comprises the following steps: preparing a modified foamed aluminum main body structure, constructing a modified bioactive surface layer, filling a modified phase change material capsule, and putting a restoration unit. According to the invention, the foamed aluminum main body structure provides a stable three-dimensional through porous network, and a natural reef habitat environment is simulated; a hydroxyapatite coating or a polymer layer constructed on the surface of the coral bone-imitating material remarkably improves the coral larva attachment and colonization efficiency through coral bone-imitating inorganic components or specific polypeptides respectively; the phase-change material capsules filled inside buffer water temperature fluctuation through phase-change latent heat, a stable micro-thermal environment is provided for coral growth, the functions of all the components are complementary and synergistic, foamed aluminum provides a carrier for surface functionalization, the surface active layer optimizes a biological interface, the internal temperature adjusting unit guarantees ecological suitability, and an efficient repairing system is formed. The coral reef ecological restoration effect is obviously improved.

The invention discloses a Janus air filtering membrane for capturing, detecting and sterilizing integrated biological aerosol and a preparation method of the Janus air filtering membrane, and belongs to the technical field of filtering membranes. According to the technical scheme, the air filtering membrane is provided with an asymmetric two-side structure and a soluble micro-nano porous network structure, the surface of the filtering membrane is asymmetrically modified through an amphiphilic AIE photosensitizer, the Janus structure is constructed on the basis that the overall structure of the filtering membrane is not damaged, aggregation of the AIE photosensitizer on the single side of the filtering membrane is achieved, and therefore the air filtering membrane is formed. The air filter membrane has green capture detection performance and AIE photodynamic disinfection performance. The preparation method comprises the steps of solution preparation, filter membrane forming, surface asymmetric modification and drying. According to the Janus air filtering membrane, efficient capture and enrichment of biological aerosol can be achieved, the Janus air filtering membrane is used for microbiological detection under the guidance of near-infrared fluorescence imaging after being colored, and effective inactivation of air pathogens can be achieved by means of white light irradiation.

The invention discloses a preparation method of a nano-porous melamine / paraffin modified phase change composite material. The thermal conductivity of melamine foam originally used as a thermal insulation material is improved by utilizing a carbonization mode, and then the porous network structure of the melamine foam is utilized to store the thermal conductivity enhanced paraffin, so that the composite material which not only has improved thermal conductivity but also can be used for packaging a phase change material is obtained. The invention also discloses the nano-porous melamine / paraffin modified phase change composite material prepared according to the method, and the preparation method of the nano-porous melamine / paraffin modified phase change composite material disclosed by the invention solves the problems of low load rate and low thermal conductivity of the existing phase change energy storage material. The melamine foam and the paraffin used in the invention are low in cost, the preparation process of the composite material is simple, and the composite material is suitable for industrial and large-scale production of the phase change material.

The invention relates to the technical field of personal thermal management, and particularly discloses a PEG (at) SiO2 (at) MXene composite material and a preparation method and application thereof.The preparation method comprises the following steps that titanium aluminum carbide is etched with hydrofluoric acid, and multiple layers of MXene are obtained; the preparation method comprises the following steps: blending tetraethoxysilane and polyethylene glycol, stirring at normal temperature, and carrying out amination modification on a product to obtain a PEG (at) SiO2 nano microcapsule; and blending the PEG (at) SiO2 nano microcapsule and the multiple layers of MXene, and stirring at normal temperature, so as to obtain the PEG (at) SiO2 / MXene composite material. A PEG long chain is embedded into a SiO2 porous network to form an interpenetrating, cross-linking and coating structure, and SiO2 forms a spherical shell layer on the outer layer of PEG, so that the problem of leakage of PEG can be solved; the preparation method comprises the following steps: preparing a PEG (at) SiO2 nano-microcapsule, inserting the prepared PEG (at) SiO2 nano-microcapsule between multiple layers of MXene through a vacuum injection method, combining the PEG (at) SiO2 nano-microcapsule with the multiple layers of MXene through electrostatic adsorption to obtain the PEG (at) SiO2 MXene composite material with a sandwich structure, and the PEG (at) SiO2 MXene composite material has rapid photothermal conversion and subsequent heat storage capability and thermal cycle stability.

The present invention discloses a nanocellulose graphene quantum dot high-sensitivity humidity sensor and its green preparation process, comprising: a porous composite humidity-sensitive membrane prepared by mixing nanocellulose, graphene quantum dots and polydimethylsiloxane in proportion, wherein the porous composite humidity-sensitive membrane constitutes a sensing surface; a polydimethylsiloxane layer coated on the side of the porous composite humidity-sensitive membrane; a flexible electrode adhered to the side of the porous composite humidity-sensitive membrane through the polydimethylsiloxane layer; and a wire connected to the flexible electrode. The humidity sensor of the present invention has a sensing medium layer, which is a porous composite humidity-sensitive membrane prepared by nanocellulose, graphene quantum dots and polydimethylsiloxane. Nanocellulose and graphene quantum dots are interlaced and combined to form a flexible three-dimensional porous network structure with a large specific surface area, and polydimethylsiloxane improves the stability of the porous network structure, thereby effectively promoting the conduction and penetration of water molecules on the surface of the composite humidity-sensitive membrane, thereby improving the sensitivity and sensing performance of the sensor.

The present application relates to the technical field of nano-catalytic material preparation, in particular to a preparation method of multi-stage pore mesoporous carbon loaded metal nanoparticles, which constructs vertical and through macroporous channels by taking biomass diatomite as a template, forms ordered mesoporous structure by introducing block copolymer, and realizes macro-pore-mesopore-micropore three-stage communication of carbon-based skeleton by adding porogen to produce macro-porous network in the pyrolysis process, and gradientally limits and loads bimetallic components on the multi-stage pore mesoporous carbon. The material has the advantages of macroporous rapid mass transfer, mesoporous limited stable nanoparticles and single-atom site efficient catalysis, and can efficiently catalyze and degrade various wastewater organic pollutants in a wide pH range.

Electrodes for energy storage devices are disclosed that comprise a solventless electrode film. The solventless film comprises a porous network of an active material attached together by binder particles. The binder particles comprise a high density polyethylene polymer.

The invention discloses a composite phase change material containing a directional hierarchical pore heat conduction network and a preparation method thereof.The method comprises the steps that an aqueous solution of polyamic acid salt, an aqueous solution of graphene oxide and modified expandable graphite flakes are mixed and then subjected to directional freezing and freeze drying, and a porous network framework is prepared; sequentially carrying out imidization, thermal expansion and graphitization treatment on the porous network skeleton in an inert atmosphere to prepare a graphite-based directional hierarchical pore network skeleton; and under vacuum, dipping the graphite-based directional hierarchical pore network skeleton in the phase change material to prepare the composite phase change material containing the directional hierarchical pore heat conduction network. By modifying expandable graphite flakes to optimize dispersibility and combining ice crystal template induced assembly and a controllable expansion process, an axial ordered heat conduction network and a porous synergistic confinement structure are constructed, the heat conduction and heat storage efficiency of the material is effectively improved, capillary adsorption of multi-scale apertures is utilized, and the heat storage efficiency of the material is improved. And the leakage problem of the solid-liquid phase change material is effectively solved.

The invention relates to the field of biological materials and nanotechnology, and discloses a nano lignin-based hydrogel preparation method which comprises the following steps: S1, pretreating more than 15% of lignin-rich cellulose biomass raw materials by using a choline chloride-lactic acid deep eutectic solvent to prepare nano lignin particles; s2, the nano lignin particles are mixed with silver nitrate and sodium hydroxide, and lignin-silver nano particles are synthesized through an oxidation-reduction reaction; s3, adding the lignin-silver nanoparticles into a polyvinyl alcohol solution, and mixing to form a mixture; and S4, carrying out freezing-thawing cycle induced physical crosslinking on the mixture to form the nano composite hydrogel. By forming a compact porous network, the hydrogel not only has good mechanical properties (the tensile strength reaches 0.7-0.9 MPa), but also has good toughness and ductility (1.0-1.3 MJ.m <-3 >) and excellent pressure sensitivity (the pressure sensitivity is 2.5-2.7 kPa <-1 >).