307 results about "Nanometer particle" patented technology

The invention discloses a photopolymer type holographic recording medium and a preparation method and application thereof.The photopolymer type holographic recording medium comprises a writing monomer, film-forming resin, a photosensitive initiation combination agent and a catalyst, the writing monomer comprises nanoparticles and a polymerizable monomer, and the film-forming resin is prepared from the nanoparticles and the polymerizable monomer; the refractive index of the polymerizable monomer is smaller than that of the nanoparticles, and the difference between the refractive index of the nanoparticles and the refractive index of the polymerizable monomer is larger than 0.5. The film-forming resin includes a polyol compound and an isocyanate-based compound. The catalyst is used for catalyzing a polyol compound and an isocyanate compound to react to form a film. The photosensitive initiation combination agent is used for sensing light and inducing polymerization of the polymerizable monomer. According to the photopolymer type holographic recording medium disclosed by the invention, after exposure, the polymerizable monomers located in the bright area and the nanoparticles extruded to the dark area have relatively large refractive index difference, so that the refractive index modulation degree of the recording grating can be improved; the film-forming resin provides effective support for the nanoparticles, and the nanoparticles are not agglomerated.

The invention discloses a food-grade high-temperature-resistant coating and a preparation method thereof. The high-temperature-resistant coating is prepared from 60-75% of matrix resin, 18-28% of surface hydrophobic modified nano functional filler and 10-20% of auxiliaries, and the nano functional filler is prepared from 10-15% of nano silicon dioxide, 5-8% of nano aluminum oxide and 3-5% of nano titanium dioxide. According to the food-grade high-temperature-resistant coating and the preparation method thereof, surface hydrophobic modification is carried out on nano particles through a silane coupling agent, the compatibility and dispersion stability of the nano particles in a resin matrix are remarkably improved, coating defects caused by agglomeration at high temperature are avoided, a hydrophobic barrier is formed by the modified nano filler, the moisture permeability is reduced, and the high-temperature-resistant performance of the food-grade high-temperature-resistant coating is improved. And the damp-heat aging resistance of the coating is enhanced.

The invention discloses water-based wear-resistant ink and a preparation method thereof, and belongs to the technical field of ink. The ink is prepared from the following components in parts by weight: 20 to 35 parts of waterborne polyurethane resin, 15 to 25 parts of waterborne acrylic resin with an acid value of 40 to 80 mg KOH / g, 5 to 15 parts of KH570 silane coupling agent modified nano aluminum oxide, 3 to 8 parts of polyethylene wax emulsion, 10 to 20 parts of pigment and auxiliaries. The preparation method comprises the following steps: firstly, carrying out surface modification on the nano aluminum oxide by using KH570, and then mixing, dispersing and grinding all the components. Through the synergistic effect of the acrylic resin with a specific acid value and the modified nano aluminum oxide, the problem that nano particles are easy to agglomerate in a system is solved, the nano particles can be stably dispersed, and the interface bonding with the resin is enhanced, so that the ink is endowed with excellent adhesive force, wear resistance and storage stability while the process is simplified and the cost is reduced; the BOPP film packaging material is especially suitable for BOPP film packaging materials.

The invention discloses a preparation method and application of a concave-structure SERS (Surface Enhanced Raman Scattering) substrate for prostatic cancer exosome detection, and relates to the field of Raman spectrum detection. The invention aims to solve the problems that the quantity of electromagnetic field hot spots of the currently reported SERS substrate with the concave structure is small, the SERS substrate does not have good uniformity, the size is not matched with EVs, the detected EVs signal is relatively weak, and the parting detection requirement cannot be met. The preparation method of the SERS substrate with the concave structure comprises the following steps: 1, preparing a PDMS concave trap structure array; 2, preparing a concave well array of which the surface is covered with densely arranged Au NPs; according to the invention, Au nanoparticles are grown in situ in a PDMS concave structure, a concave trap array of which the size is matched with that of EVs and the surface is covered with densely arranged Au NPs is constructed, high-sensitivity detection (lower detection limit of 105 particles / mL) and high-accuracy typing of prostatic cancer EVs are realized, and the accuracy rate can reach 98% or more.

The invention discloses a high-refractive-index nano-composite optical adhesive and a preparation method thereof, and belongs to the technical field of optical transparent adhesives. The optical adhesive is prepared by taking a polyurethane acrylate oligomer with a specific structure as matrix resin, introducing surface-modified barium titanate and zirconium oxide core-shell nanoparticles as a functional filler, and matching with an active diluent, a photoinitiator and a silane coupling agent in a specific proportion. Through the design of the core-shell structure, the core problems that the high-refractive-index nanoparticles are easy to agglomerate in an organic resin matrix, the dispersion stability is poor and the bonding force with a matrix interface is weak are effectively solved. The prepared optical adhesive has a refractive index of more than 1.65, a light transmittance of more than 99% and a haze of less than 0.3% after being cured, has excellent bonding strength, weather resistance and long-term use stability, and is especially suitable for precise lamination of high-end display devices (such as OLEDs (Organic Light Emitting Diodes) and micro-lens arrays).

The invention discloses a preparation method of a photo-thermal super-hydrophobic coating with excellent anti-icing / deicing performance in a low-temperature and high-relative-humidity environment, which comprises the following steps of: firstly, growing photo-thermal Cu-MOF (Metal Organic Framework) nano particles on the surfaces of fibrous clay mineral nano particles with low heat conductivity coefficient in situ to construct composite photo-thermal particles with a two-stage nano / nano structure; the preparation method comprises the following steps: preparing nano-particles, then carrying out low surface energy modification on the nano-particles, introducing a low-heat-conductivity-coefficient binder, inducing the binder to generate phase separation through a non-solvent to form a micron-scale binder / low-surface-energy nano-particle aggregate, and finally, spraying to construct the photo-thermal super-hydrophobic coating with a three-level micro / nano / nano structure. The three-level micro / nano / nano structure of the coating simultaneously endows the coating with excellent photo-thermal performance in a low-temperature and high-relative-humidity environment and Cassie-Baxter state stability of liquid drops on the surface of the coating, so that the coating has excellent passive anti-icing / frosting and active deicing / defrosting performance in the environment. The low heat conduction characteristic of the coating further inhibits heat exchange between the base material and water drops, so that the passive anti-icing / frosting performance of the coating is further improved. In addition, the invention also has the advantages of simple preparation method, large-area preparation and the like, and lays a solid foundation for the practical application of the photo-thermal super-hydrophobic anti-icing coating.

The invention relates to the technical field of metal surface treatment, in particular to a method for achieving titanium metal surface rapid boronizing through electric field induction nanometer assembly in molten salt, titanium dioxide powder, boron powder, inorganic salt and a nanometer particle wrapping agent are evenly mixed, and the molten salt containing nanometer TiB2 is obtained after heating reaction. Graphite and a titanium metal part are put into molten salt containing nano TiB2, the graphite serves as a positive electrode, the titanium metal part serves as a negative electrode, the surface area ratio of the positive electrode to the negative electrode is (3-10): 1, the nano TiB2 in the molten salt is assembled on the surface of the titanium metal part under the action of an electric field to form a boronizing layer, and the boronizing speed is 60-500 microns / h. Compared with an existing high-temperature boronizing technology with active boron atoms as a constituent unit, the high-temperature boronizing technology has the advantages that the boronizing speed can be remarkably increased, the high-temperature boronizing treatment time of titanium metal is shortened, energy is saved, cost is reduced, and meanwhile the negative influence of the high-temperature environment on the organization structure and the mechanical property of a titanium metal part is eliminated.

The invention relates to the technical field of coatings, and provides a nano anti-corrosion waterproof coating capable of resisting high and low temperatures and acid and alkali, which is prepared from the following raw materials in parts by mass: 30 to 40 parts of pure acrylic emulsion, 10 to 20 parts of modified nano silicon dioxide, 2 to 4 parts of nano titanium dioxide, 3 to 6 parts of nano zinc oxide, 2 to 4.4 parts of auxiliaries and 5 to 9 parts of water, the modifier comprises dibasic ester and / or dihydric alcohol. According to the technical scheme, the problem that the performance of the nano coating is low due to the fact that the nano particles are easy to agglomerate and are not uniformly dispersed in the base material in the prior art is solved.

The invention discloses a super-hydrophobic self-repairing polyurethane film for photovoltaics and a preparation method of the super-hydrophobic self-repairing polyurethane film. The super-hydrophobic self-repairing polyurethane film is prepared from the following components in parts by weight: polyether polyol, isocyanate, a catalyst, a solvent, a self-repairing auxiliary agent, a chain extender and super-hydrophobic nanoparticles, the super-hydrophobic nano particles are fluorine-silicon polymer nano particles which are modified hydrophobic nano particles obtained by hydrolyzing two or more organic silicon and then introducing a C-F bond through copolycondensation to realize fluorination modification; the service life of the composite material is prolonged, the durability of the composite material is improved, and the material can be self-healed after being damaged by the outside; on the basis of self-repairing, hydrophobic nanoparticles are added to realize a super-hydrophobic surface; the transparent polyurethane film material for the photovoltaic power generation panel can be adhered through electrostatic adsorption or other adhesives, so that the film material is loaded on the photovoltaic panel, the photovoltaic panel is protected, and the photovoltaic panel is prevented from being damaged due to external environment pollution.

The invention belongs to the technical field of preparation, analysis and detection of new materials, and particularly relates to synthesis of a magnetic cation column [5] arene porous polymer PP5-1F-MNP and a new method for constructing a magnetic solid phase extraction assisted high performance liquid chromatography-tandem mass spectrum based on the PP5-1F-MNP. According to the PP5-1F-MNP, Fe3O4 nano particles serve as a core, column [5] arene porous polymer PP5-1F is coated outside the Fe3O4 nano particles, column [5] arene and 3-fluoropyridine are subjected to an electrophilic substitution reaction to generate PP5-1F, then a one-pot solvothermal method is utilized, the PP5-1F and FeCl3. 6H2O are subjected to a reaction, and the PP5-1F-MNP is prepared. The novel method for magnetic solid phase extraction assisted high performance liquid chromatography-tandem mass spectrometry based on PP5-1F-MNP can be used for quantitative analysis of C8-C14 long-chain PFCs at the same time, can be used for detection of trace PFCs in an actual sample, and provides a novel method and idea for enrichment and detection of PFCs in a complex matrix sample. Meanwhile, the huge potential of the pillararene material in the field of adsorption is shown.

The invention relates to the technical field of material surface engineering, and discloses a plastic surface treatment process to solve the problems that in the prior art, a plastic surface coating is poor in adhesive force and single in function, and a traditional treatment method is not environmentally friendly. The process sequentially comprises the following steps: pre-treating a base material, and obtaining a clean and stress-free base material through ultrasonic cleaning and thermodynamic stress elimination; performing low-temperature plasma surface activation, performing physical bombardment and chemical modification on the plastic surface by utilizing plasma of specific process gas in a vacuum environment, introducing a large number of active functional groups, and remarkably improving the surface energy; and preparing and applying the functional nano coating, namely forming firm covalent bonds by using the coupling agent in a coating solution containing functional nano particles and a coupling agent and the anchor points, so that the chemical coupling of the functional coating and the plastic substrate is realized.

The invention belongs to the technical field of additive manufacturing, and discloses an ODS alloy with dispersively distributed nano oxide and a preparation method of the ODS alloy, and the prepared rare earth nano oxide with a core-shell structure and coated with a metal simple substance improves the wettability of the nano oxide in molten metal, so that the wettability of the nano oxide in molten metal is improved. And meanwhile, rare earth oxide can be prevented from reacting with elements in steel to change chemical components. The size of nano particles in the prepared ODS alloy can be controlled to be 20 nm or below, the nano particles are distributed in a dispersed mode, the number of the nano particles is large, and performance improvement of the ODS alloy is facilitated.

The invention discloses a graphene aerogel modified elastic graphite material and a preparation method thereof, and the graphene aerogel modified elastic graphite material comprises the following components by mass: 50-80 parts of crystalline flake graphite; 8 to 15 parts of graphene aerogel; 3 to 8 parts of aminated modified boron-doped carbon nanotubes; 2 to 6 parts of hydroxyapatite-cerium oxide composite nano particles; 1 to 4 parts of a polyimide-montmorillonite nano composite material; 0.5 to 3 parts of titanate coupling agent modified nano silicon dioxide; 1-3 parts of a dispersant; 2-5 parts of a binder; the amination modified boron-doped carbon nanotubes can enhance the electrical conductivity and interface bonding force of the material, the hydroxyapatite-cerium oxide composite nanoparticles improve the high-temperature stability and mechanical toughness of the material, and the polyimide-montmorillonite nanocomposite improves the corrosion resistance and resilience durability of the material. And the titanate coupling agent modified nano silicon dioxide further optimizes the dispersion uniformity of all the components, and the comprehensive performance of the material is remarkably improved.

The invention discloses a high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating and a preparation method thereof, and belongs to the technical field of organic silicon coatings. According to the invention, methyltrimethoxysilane, silica sol, hydroxyl silicone oil, isopropanol and water are used as raw materials to prepare a high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating, and a design strategy of manufacturing a nanoscale polysiloxane coating through an organic silicon precursor controllable sol-gel hydrolysis process is adopted. According to the present invention, the coating with the matrix completely composed of the in-situ generated nano SiO2 particles is prepared, the defect minimization and the highly-crosslinked Si-O-Si network structure are achieved, the nano-scale inorganic structure has long-term thermal stability, and the visible light transmittance of the coating can achieve 98% due to the inhibition of the light scattering by the sub-wavelength particle size; and tiny nano particles are uniformly and tightly arranged on the surface of the coating, so that the coating is endowed with ultrahigh hardness. In addition, the coating still maintains the inherent antifouling property of the organic silicon coating.

The invention discloses a toughened scratch-resistant polypropylene composite material which is prepared from the following components: polypropylene resin, maleic anhydride grafted polyethylene, modified nano silicon carbide, an organic silane coupling agent, an inorganic filler, an antioxidant, stearic acid, an elastomer and nano zinc oxide. Wherein the weight part ratio of the polypropylene resin to the maleic anhydride grafted polyethylene is 10: 1; wherein the particle size of the nano zinc oxide is 30-40 nm; the polypropylene composite material prepared by the invention not only has excellent mechanical properties, but also has excellent scratch resistance. The modified nano silicon carbide is introduced into the polypropylene composite material, due to the fact that the modified nano silicon carbide is small in particle size and large in specific surface area, physical and chemical defects of the surface are increased, the opportunity of physical or chemical bonding between nano particles and macromolecular chains is increased, the molecular chains are not prone to sliding and breaking, and therefore the rigidity of a matrix is enhanced. The improvement of the rigidity is helpful for resisting the generation of external scratches, so that the scratch resistance of the material is improved.

The invention relates to the technical field of photo-thermal gas treatment, in particular to a pH response type conjugated polymer nano-composite particle as well as a preparation method and application thereof, and develops a conjugated polymer nano-composite particle IN-20-(NH4) 2S capable of intelligently responding to acidic pH in a tumor microenvironment, which is used for photo-thermal and gas synergistic treatment of tumors. The nanoparticles generate heat under NIR-II light induction to promote the conjugated polymer composite material to release (NH4) 2S, the (NH4) 2S responds to acidic pH and can react with acid to generate H2S, the concentration of the (NH4) 2S is gradually increased along with time, the release amount of the (NH4) 2S is more remarkable under the illumination condition, and a new strategy is provided for enhancing the accuracy and effectiveness of tumor treatment.

The invention belongs to the technical field of detection, and particularly relates to an orderly layered SERS (Surface Enhanced Raman Scattering) detection membrane as well as a preparation method and application thereof to detection of purine needling effect substances. The preparation method of the SERS detection membrane comprises the following steps: preparing noble metal nano-sol with different particle sizes, wherein the surface of the noble metal nano-sol is modified with a hydrophilic stabilizer; the preparation method comprises the following steps: respectively dispersing precious metal nano-sol with different particle sizes into water, then adding dispersion liquid, and after shaking, spontaneously assembling nano-particles on a gas-liquid interface to form a single-layer nano-particle film; the method comprises the following steps: transferring a nano-particle film to the surface of a flexible film, drying, transferring nano-particle films with at least two particle sizes on the surface of the nano-particle film, and drying to obtain the SERS detection film loaded with at least three layers of nano-particle films with different particle sizes, wherein the particle sizes of the nanoparticle films are sequentially reduced from outside to inside. According to the SERS detection membrane, macromolecular protein and small molecular purine in acupuncture body fluid can be separated out, and high-sensitivity and high-stability detection on the macromolecular protein and the small molecular purine can be achieved on the front face and the back face of the SERS detection membrane respectively.

The invention discloses a preparation method of nano silicone rubber core-shell particles and application of the nano silicone rubber core-shell particles in 3D printing, copolymer shells of the nano silicone rubber core-shell particles contain electronegative groups, so that the surfaces of the core-shell particles are negatively charged, and charge repulsive force is formed between the particles; and moreover, side groups with large steric hindrance are provided, so that agglomeration among nano particles is effectively prevented. Epoxy groups are contained in a copolymer shell layer, so that the nano silicone rubber core-shell particles have good compatibility when being applied to 3D printing photosensitive resin, and long-term quality stability of the 3D printing photosensitive resin is facilitated.

The invention relates to the technical field of electromagnetic shielding materials, and discloses an anti-electromagnetic interference high-frequency lightweight nano new material, which is composed of 10-35% of graphene quantum dots, 5-20% of multi-walled carbon nanotubes, 5-20% of ferrite nanoparticles and 10-30% of a polymer matrix. The content of the ferrite nanoparticles is 15%-25%, and the content of the polymer matrix is 40%-55%; according to the composite material, through the synergistic effect of the graphene quantum dots, the multi-walled carbon nanotubes and the ferrite nanoparticles, the electromagnetic shielding effectiveness, the mechanical strength, the thermal stability and the lightweight property of the composite material are remarkably improved, and the composite material is particularly suitable for the fields of high-frequency electronic equipment, communication equipment and aerospace; the material has good processability, stable performance and efficient electromagnetic interference shielding capability, and can meet the requirements of modern high-frequency equipment on light, high-temperature-resistant and efficient shielding materials.

The invention discloses a quick-dry transparent super-hydrophobic and super-oleophobic coating suitable for a photovoltaic panel and a preparation method of the quick-dry transparent super-hydrophobic and super-oleophobic coating, and belongs to the technical field of new materials. The invention provides a quick-dry transparent super-hydrophobic and oleophobic coating. The quick-dry transparent super-hydrophobic and oleophobic coating comprises nano-scale hydrophobic silicon dioxide particles and a fluorine-containing acrylate polymer, through reasonable design and combination of the nanoparticles and the polymer, the super-hydrophobic and oleophobic coating with high visible light transmittance and excellent self-cleaning performance is obtained. The coating can ensure the cleanliness of glass on the surface of the photovoltaic panel in a long time, is hydrophobic and oleophobic, keeps a high sunlight incidence rate, and improves the power generation level; meanwhile, the preparation process of the coating is simple and convenient, the flow is simple, the curing and film forming time is short, and the cost waste caused by complex procedures and manual maintenance and cleaning is reduced.

The invention belongs to the technical field of functional coatings, and particularly relates to application of an in-situ growth three-dimensional ZIF-8 / MXene composite material in preparation of a zinc-iodine battery. The protective coating prepared by the method comprises a composite material and a binder, the protective coating is attached to the surface of a zinc electrode, the composite material is composed of an MXene two-dimensional nanosheet and ZIF-8 nanoparticles, and the ZIF-8 nanoparticles are uniformly distributed on the MXene two-dimensional nanosheet. The invention further discloses a specific preparation method of the coating, the prepared coating can effectively avoid aggregation of MXene nanosheets, an electric field is uniform through charge redistribution, the cycle life of a Z-coated M-Zn negative electrode exceeds 1050 h under the current condition of 1 mA cm <-2 >, the corrosion resistance is excellent, and the total battery performance exceeds 2400 circles. The research provides a simple and convenient method for designing the reversible zinc negative electrode, and is expected to be widely applied to other metal-based negative electrode systems.

The invention discloses a preparation method of a woven bag, and the preparation method comprises the following steps: nano reinforced phase pretreatment and master batch preparation, woven cloth layer production, functional layer film co-extrusion, multi-layer compounding process, post-treatment and bag making. In the preparation method, modified nano silicon dioxide and nano calcium carbonate are introduced, so that the tensile strength of the woven bag is improved; wherein the surface of the modified nano silicon dioxide is treated by a coupling agent, strong interface bonding is formed between the modified nano silicon dioxide and a polypropylene matrix, and rigid nano particles effectively bear and disperse stress; nano calcium carbonate is dispersed in polypropylene as a rigid filler, molecular chain slippage is hindered, the material rigidity is improved, and meanwhile the impact resistance of the woven bag is improved through reinforcing phase modification and composite structure design.

The invention provides a preparation method of a spherical layered oxide positive electrode material formed by compactly stacking primary particles, the chemical general formula of the spherical layered oxide positive electrode material is NaxNi < 0.4-y > Fe < 0.2 + y + z > Mn < 0.4-z > O < 2 >, the value range of x is 0.8-1, and the value ranges of y and z are 0-0.1. The preparation method comprises the following steps: dissolving a sodium source precursor and a transition metal source precursor in water, stirring to obtain slurry, sanding, spray-drying and granulating to obtain spherical precursor powder, and finally calcining at high temperature to obtain the spherical layered oxide positive electrode material. The spherical layered oxide positive electrode material is spherical secondary particles formed by agglomerating cuboid-shaped primary nano particles, the particle size of the particles is 4-8 microns, the specific surface area is 0.40-0.55 m < 2 > / g, the tap density is 1.50-1.65 g / cm < 3 >, and the interlayer spacing is 1.50-1.65 g / cm < 3 >. The preparation process is simple and easy to implement; the prepared positive electrode material has relatively high tap density and specific capacity and excellent cycling stability, shows good performance when being applied to the sodium-ion battery, and has a wide application prospect.

The invention discloses preparation and application of a polymer composite material for scattering and absorbing high-energy blue light. The inorganic particle material contained in the composite material comprises at least one of inorganic material submicron particles and nanometer particles; when the types of the contained inorganic material submicron particles and the contained inorganic material nanoscale particles reach or exceed two types, the following characteristics are further included: the diameters of the various inorganic material submicron particles and the various inorganic material nanoscale particles are different, and the mass parts of the inorganic material submicron particles and the various inorganic material nanoscale particles in the total mass are different; and the inorganic material nano-scale particles and the inorganic material sub-micron-scale particles are made of the same or different materials, and the refractive indexes of the inorganic material sub-micron-scale particles and the inorganic material nano-scale particles are different due to the material difference of the inorganic material sub-micron-scale particles and the inorganic material nano-scale particles. The blue-light-proof glass can be widely applied to the aspects of eye protection illumination, liquid crystal display, blue-light-proof glasses / films, sun shading and the like, and has the effects of scattering and absorbing blue light, so that the harm caused by the blue light is reduced.

The invention belongs to the technical field of composite current collector base films, and particularly relates to a high-performance BOPP film for a composite current collector and a preparation method thereof.The preparation method comprises the steps that firstly, PP master batches, functional auxiliaries and composite filler are mixed, melt extrusion and two-way stretching film forming are conducted, and a PP base film is prepared; then carrying out corona treatment on the PP base film, and uniformly coating the PP base film with the coating liquid in an online coating manner; and finally, curing to form a film, and drawing and rolling. Wherein the composite filler is prepared by the following steps: putting MAH-g-PP and nanoparticles into an extruder, adding a stearic acid lubricant and polyvinyl alcohol at the same time, and carrying out extrusion granulation. The preparation method has the beneficial effects that the nano particles treated by MAH-g-PP are added into PP, so that the mechanical strength of the base film is remarkably improved; the cured coating is formed on the surface of the base film, so that the interface bonding force with metal ions is remarkably improved; the synergistic effect of the two improves the heat resistance of the base film.

The invention belongs to the technical field of Raman spectroscopy, and particularly discloses a preparation method and application of a hydrogel in-situ coated Au-Pt nano-enzyme flexible SERS (Surface Enhanced Raman Scattering) substrate, and the preparation method comprises the following steps: synthesis of concentrated gold nanoparticles: stirring and heating a HAuCl4 aqueous solution to boiling, quickly adding sodium citrate, stirring and heating to obtain a concentrated gold nanoparticle solution; heating and refluxing the mixed solution for 10-60 minutes until the mixed solution becomes wine red; gradually cooling to room temperature while stirring to obtain concentrated gold nanoparticles; and preparation of the hydrogel in-situ coated Au-Pt nano-enzyme flexible SERS substrate: mixing the hydrogel and concentrated gold nanoparticles according to a volume ratio, then adding H2PtCl6 and ascorbic acid, and carrying out a reaction to obtain the hydrogel in-situ coated Au-Pt nano-enzyme flexible SERS substrate Au-Pt-Atar. According to the prepared Au-Pt-Agar, due to the fact that the Au-Pt-Agar effectively coats the nano particles, the influence of the external environment (oxygen, acid, alkali and the like) on the nano particles is prevented, the particles are evenly dispersed in the hydrogel, and the detection uniformity and stability of an SERS substrate are improved under the condition that the sensitivity is guaranteed.

A method for preparing a fiber composite material toughened by nano-particles, comprising: first dispersing agglomerated nano-particles uniformly in a low-viscosity, volatile dispersant by ultrasonic and micro-jet treatment (two-stage dispersion), and spraying the dispersant containing nano-particles uniformly on the fiber fabric through a high-pressure spray gun; after the liquid is removed from the fiber fabric, subjecting the nano-modified fiber fabric and resin to composite molding. The method provided by the present application is simple to operate, can be scaled up, and does not change the original manufacturing process of the fiber composite material. Moreover, the method provided by the present application requires only a very small amount of toughening components to achieve a significant increase in the interlaminar fracture toughness of the composite, which has great application prospects.

The invention relates to the technical field of conductive functional coatings, and discloses a preparation method of a conductive antibacterial anti-corrosion anti-aging coating. According to the method disclosed by the invention, the silane coupling agent and the conductive filler are modified and then are co-hydrolyzed with the organic metal salt, so that the high-performance coating formed by bridging the conductive filler and the nanoparticles by an organic polymer chain is prepared, and the selected long-chain organic silicon modified silane coupling agent is used for improving the toughness and hydrophobicity of the coating; the adhesion and corrosion resistance of the coating are improved by introducing epoxy and dopamine structures, the aging resistance is improved by the nano particle effect of nano silicon dioxide and metal oxide, and the coating is endowed with conductivity by the conductive filler. The coating integrating multiple functions is prepared through co-hydrolysis of the organic silicon, the organic metal salt and the modified conductive filler, the defect that multiple functions of an existing coating cannot be considered at the same time is overcome, and the coating has important significance for widening the practical application of the coating.

The utility model relates to the technical field of impurity separation, in particular to a nano-particle amorphous carbon impurity low-speed centrifugal separation device which comprises a separation tank, an internal support and a screening structure, the separation tank comprises a tank body, and four lifting sliding plates are fixedly arranged on the inner wall of an upper opening of the tank body at equal angles; the inner bracket comprises a bearing; the outer ring of the bearing is slidably clamped with the inner wall of the tank body; the screening structure comprises a fixed edge, the outer side surface of the fixed edge is fixedly connected with the bearing inner ring, four lifting sliding blocks are fixedly installed on the lower edge of the outer side surface of the fixed edge at equal intervals, and the bottom sides of the lifting sliding blocks abut against the upper surfaces of lifting sliding plates in a sliding mode. According to the centrifugal separation device, the lifting sliding blocks slide on the upper surfaces of the lifting sliding plates, the supporting frame structure and the screening structure continuously conduct lifting and falling actions through guiding of the lifting sliding plates, and nanoparticles in the screening structure can be continuously turned over while centrifugal separation work is conducted.

The invention relates to the field of functional composite materials, in particular to a preparation method of a multi-stage pore broadband wave-absorbing material based on hollow graphene foam / metal organic framework derivation. The broadband wave-absorbing material is formed by compounding macroporous hollow graphene foam and porous carbon derived from a metal organic framework. The preparation method comprises the following steps: firstly, preparing by utilizing a chemical vapor deposition method, and further etching an original nickel framework to obtain the macroporous hollow graphene foam; the preparation method comprises the following steps: preparing a Co / Ni nano-particle-embedded porous carbon composite material, coating the surface of the Co / Ni nano-particle-embedded porous carbon composite material with nano-particles of a ZIF-8-ZIF-67 core-shell structure, carrying out Ni ion exchange to enhance a magnetic coupling network, carrying out high-temperature carbonization evaporation on a Zn core to obtain a Co / Ni nano-particle-embedded porous carbon structure, obtaining a three-dimensional hybrid composite material with a multi-stage pore structure, and carrying out combination packaging to form the ultra-light and broadband wave-absorbing material. The MOF is applied to preparation of radar stealth coatings, electromagnetic shielding devices or 5G communication equipment, and the problems of poor MOF dispersity and insufficient conductive network loss capability are solved.