463 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 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 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.

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 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 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.

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 >).

The invention discloses an anti-condensation and anti-icing membrane material and a forming process thereof, and relates to the technical field of composite membrane materials, the anti-condensation and anti-icing membrane material comprises the following raw materials: 30-50 parts of silica aerogel particles, 25-30 parts of an EVA base material, 5-10 parts of a hydrophobic modifier, 0.5-1 part of sodium polyacrylate, 5-8 parts of nano calcium carbonate, 3-5 parts of aluminum hydroxide, 0.5-1 part of a silane coupling agent and the like. The silicon dioxide aerogel particles serve as a core heat insulation material, the porous network structure of the silicon dioxide aerogel particles remarkably reduces the heat conductivity coefficient of the base film, passive heat insulation is achieved, the vacuum barrier effect is formed, heat conduction and convection are greatly reduced, the energy-saving and heat-preservation effect is improved, the surface temperature is delayed to be reduced to be below the freezing point, and the freezing time is delayed in the low-temperature environment; and the low surface energy characteristic of the fluorine-containing resin is combined with the micro-nano coarse structure of the nano silicon dioxide, so that a lotus leaf effect imitating super-hydrophobic surface is formed, water drops rapidly roll down, and ice nucleus forming sites are reduced.

The invention relates to hydrogen bond-covalent bond-oriented network nanofiber hydrogel and a preparation method and application thereof.The preparation method includes the steps that PVA and BC are utilized to form a physical cross-linked network through hydrogen bond and TA cross-linking, and BC / PVA aerogel of a three-dimensional porous network structure is prepared through an oriented freezing technology; then, the BC / PVA aerogel is immersed in an AM solution, AM forms a chemical cross-linked network through free radical polymerization, and the composite materials are assembled, entangled and connected together in the polymerization process to form the BPA hydrogel of a physical-chemical cross-linked multi-network structure. Finally, the PPy / BPA conductive hydrogel with the multi-network structure is prepared through pyrrole in-situ polymerization. According to the present invention, the three-dimensional network structure of the directionally arranged micro-nano multi-scale is constructed in the hydrogel, and the three-dimensional network structure and the covalent cross-linked network form the composite hydrogel with the multi-network structure, such that the hydrogel has excellent crack resistance, and the mechanical strength and the sensitivity of the hydrogel are synergistically improved;

The invention relates to a novel phosphorus-fluorine curing agent for phosphogypsum and a preparation method thereof, and belongs to the technical field of industrial solid waste treatment and resource utilization. The curing agent comprises superfine slag powder, anhydrous sodium sulfate, water glass, water, sodium hydroxide and a Fe3O4 (at) SiO2 (at) Zr-Al bimetallic oxide stabilizer. The Fe3O4 (at) SiO2 (at) Zr-Al bimetallic oxide stabilizer is of a core-shell structure, magnetic ferroferric oxide particles serve as a core, and the surfaces of the magnetic ferroferric oxide particles are sequentially coated with an amorphous silicon dioxide protection layer and an active layer. And the active layer is an amorphous and porous zirconium-aluminum bimetallic oxide with a network structure. The preparation method of the curing agent is simple, mild in condition and easy for industrial production, the main raw material is the industrial solid waste slag, the effect of treating waste with waste is achieved, the agent addition amount is small, and the comprehensive treatment cost is low.

The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a self-repairing wave-absorbing composite material and a preparation method and application thereof. Porous biochar is used as a matrix to replace a traditional carbon base. Through the composite design of the manganese selenide nanosheets and the charcoal porous network, the problem that the charcoal loss mechanism is insufficient is solved, the magnetic-dielectric synergistic loss mechanism is realized, and the efficient electromagnetic wave absorption performance is realized by optimizing the filler. A dynamic chemical bond disulfide bond is introduced into polyurethane through a chain extender, so that a polyurethane matrix is endowed with self-repairing capability, the maintenance cost is effectively reduced, and the comprehensive protection of the electromagnetic wave absorbing coating on an electronic device is ensured. Meanwhile, the inherent flexible characteristic of polyurethane is also beneficial to multi-scene adaptation, and the environmental adaptability of the composite material is improved. In addition, a filler conductive network is coupled with the high strain characteristic of polyurethane, so that the composite material has heat insulation performance and strain induction capacity, and combination of an electromagnetic wave absorbing material and novel intelligent wearable heat management equipment is facilitated.

The invention discloses a temperature-sensitive response type medical hydrophilic polyurethane intelligent slow-release foam, and relates to the technical field of medical materials, a foam matrix layer is of a three-dimensional porous network structure formed by hydrophilic polyurethane, pores are connected with one another, an intelligent response layer is compounded on the surface of the foam matrix layer and the inner walls of the pores, and the intelligent response layer is formed by compounding the intelligent response layer and the foam matrix layer. The composite intelligent response layer comprises a temperature-sensitive polymer network and a pH-sensitive functional group, the temperature-sensitive polymer network responds to temperature change to dynamically adjust the opening and closing state of pores, and the pH-sensitive functional group responds to an alkaline environment to release antibacterial components. The temperature-sensitive polymer network can dynamically adjust the opening and closing states of the pores: when the wound temperature rises, the hydrophobicity of the polymer is enhanced, the pores automatically shrink to reduce seepage evaporation, and when the temperature drops, the hydrophilicity is recovered, and the pores expand to accelerate discharge of exudate.

The invention discloses an interface evaporation seawater desalination device based on an armor Janus structure and a preparation method, and relates to the technical field of seawater desalination devices.The device comprises a black copper net frame and a carbon nano tube sponge, the carbon nano tube sponge is filled in the black copper net frame, the black copper net frame is made of a super-hydrophobic material, and the carbon nano tube sponge is filled in the black copper net frame. The carbon nanotube sponge is made of a super-hydrophilic material; the super-hydrophilic carbon nanotube sponge on the inner layer can quickly adsorb and transmit seawater by virtue of excellent hydrophilicity and a porous network structure, and a water micro-channel penetrating through the whole body is efficiently constructed; the super-hydrophobic black copper net on the outer layer is like a protective barrier, and the super-hydrophobic characteristic of the surface of the super-hydrophobic black copper net can remarkably reduce the adhesive force between seawater and the net surface, so that salt crystals possibly separated out in the evaporation process are difficult to adhere to the surface of the super-hydrophobic black copper net, and the problem of interface blockage caused by accumulation of the salt crystals is effectively avoided.

The invention relates to the technical field of engineering plastics, and particularly discloses high glowing filament halogen-free flame-retardant polyamide and a preparation method thereof.The high glowing filament halogen-free flame-retardant polyamide is prepared from, by mass, 40%-60% of polyamide resin, 20%-40% of a reinforcing agent, 10%-20% of a halogen-free flame retardant, 1%-2% of a flame-retardant synergist and 2%-3% of auxiliaries; the main component of the flame-retardant synergist is silicon dioxide. Silicon dioxide with ultralow heat conductivity coefficient, extremely low density and high porosity is introduced into a polyamide flame-retardant composite system, the material is endowed with good adhesion and maintains high mechanical performance due to the unique three-dimensional porous network structure of silicon dioxide, the heat insulation efficiency can be greatly improved, and the flame-retardant effect is effectively achieved; the flame retardant grade of UL94 / 1.6 mm V0 is reached, and the high GWIT performance of the material is improved.

The invention is applicable to the technical field of new energy materials and water treatment, and provides solar-driven multifunctional composite hydrogel and a preparation method and application thereof, the multifunctional composite hydrogel comprises dual-network hydrogel, a nanofiber skeleton and functional particles; the double-network hydrogel is formed by interpenetrating and cross-linking a polyelectrolyte hydrogel and a temperature-sensitive hydrogel; the functional particles are loaded in a three-dimensional porous network structure formed by the double-network hydrogel and the nanofiber skeleton. When the device floats on the surface of a water body, efficient solar interface evaporation water production, stable power generation based on the water photovoltaic effect and efficient adsorption removal of nitrogen and phosphorus nutritive salt in the water body can be synchronously achieved under illumination, and therefore algae growth is inhibited. According to the invention, the integrated collaborative management of water collection, energy conversion and ecological restoration is realized, the preparation process is simple, the environmental adaptability is high, and an innovative scheme is provided for solving the distributed water-energy supply and ecological environment problems in coastal, island and other regions.

The invention provides a light graphene-based aerogel material with a high specific surface area as well as a preparation method and application of the graphene-based aerogel material. The light graphene-based aerogel material with the high specific surface area is prepared by the preparation method. The preparation method comprises the following steps: preparing a graphene oxide aqueous dispersion solution with the concentration of 1-10 mg / mL from graphene oxide; adding siloxane and a reducing agent into the dispersion solution, and carrying out hydrothermal reaction to obtain a graphene-based hydrogel precursor; and pre-freezing the precursor, and then freeze-drying to obtain the product. The light graphene-based aerogel material with the high specific surface area is used for adsorbing pollutants in water. The raw materials used in the method are low in cost, the light graphene-based aerogel with the high specific surface area is prepared through the hydrothermal reaction and freeze drying, operation is easy, secondary pollution is avoided, and large-scale production is easy; the prepared aerogel has a layered porous network structure, has the advantages of hydrophobicity, rapid adsorption, light weight and the like, and has a better effect of adsorbing organic matters and heavy metal ions in wastewater.

The present invention belongs to the field of biomedicine technology, and in particular to a preparation method and use of a composite hydrogel based on bioadhesive nanoparticles. The present invention utilizes bioadhesive nanoparticles BNP based on PLA-HPG to react with carboxymethyl chitosan, and a reversible Schiff base bond is formed by the aldehyde group on the surface of BNP and the amino group of carboxymethyl chitosan, so that BNP and the polymer are cross-linked to form a composite hydrogel with a porous network structure and containing bioadhesive nanoparticles. The composite hydrogel has good biocompatibility and injectability, and the BNP and porous structure therein enable the hydrogel to deliver water-insoluble and water-soluble drugs simultaneously, and has a sustained-release effect, can be applied to aspects such as peritoneal drug delivery and skin drug delivery, greatly expanding the application value of BNP, and has huge potential application prospects.