190 results about "Nanometer particle" patented technology

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 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 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 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 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 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 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.

The invention provides a nanometer Al3Ti reinforced aluminum-based composite material and a preparation method thereof, and relates to the technical field of aluminum-based composites.The preparation method comprises the following steps that MAX-phase ceramic particles and aluminum raw material powder are mixed and then subjected to first ball milling treatment, and first mixed powder is obtained; wherein the MAX phase ceramic particles are micron-sized ceramic particles; the first mixed powder is heated, the MAX phase reacts with Al to form A13Ti, and second mixed powder is obtained; the second mixed powder is subjected to second ball milling treatment, and third mixed powder is obtained; wherein the average particle size of A13Ti in the third mixed powder is nanoscale; and the third mixed powder is subjected to aftertreatment, and the nanometer Al3Ti reinforced aluminum matrix composite is obtained. According to the method, a nanometer strengthening phase is introduced into an aluminum matrix in a rough-to-fine mode, and the problem that when nanometer raw material powder is directly added, nanometer particles are agglomerated, and consequently the strength and plasticity of the composite material are poor is solved.

The invention provides an extrusion cogging method for realizing alloy surface nanocrystallization, which comprises the following steps: A) sequentially performing two-stage solution treatment and equal-diameter angular extrusion on an alloy bar, and applying alternating pulse current while performing equal-diameter angular extrusion to obtain an alloy subjected to dynamic strain aging pretreatment; b) placing the alloy subjected to dynamic strain aging pretreatment in a magnetic field, driving magnetic nanoparticles to impact the surface of the alloy by utilizing high-frequency vibration, and carrying out surface nanocrystallization; and C) placing the alloy workpiece subjected to surface nanocrystallization in a mold, and simultaneously carrying out in-situ superplastic forming and aging strengthening to obtain the formed alloy workpiece. According to the method, the dislocation density and the nano-structure thermal stability of the alloy material can be improved; the surface roughness Ra of the alloy material is effectively reduced to be smaller than or equal to 0.05 mu m, phase change is induced while in-situ superplastic forming deformation is conducted, a strengthening phase (such as gamma ') can be finer and more evenly distributed, and therefore higher strength and fatigue performance are obtained.

The present invention discloses a preparation method and application of a composite probe for gold nanoclusters emitting enhanced fluorescence induced by the spatial confinement effect of ZIF-8 surface. HAuCl4 and glutathione are dissolved in water, the two solutions are mixed and reacted, and purified to obtain an AuNCs solution; Zn(NO3)2·6H2O and 2-methylimidazole are dissolved in methanol, the two solutions are mixed and reacted, and the generated white precipitate is treated to obtain a zeolite imidazole framework-8 solution; the obtained AuNCs solution and the zeolite imidazole framework-8 solution are mixed, stirred, self-assembled, and treated to obtain ZIF-8@(Au) nanoparticles; zinc nitrate and dimethylimidazole are added to the nanoparticle solution for reaction, and after treatment, a sandwich ZIF-8@Au@ZIF-8 nanomaterial is obtained; the nanomaterial is mixed and treated with the AuNCs solution to obtain a ZIF-8@Au loaded with two layers of AuNCs; the operation is repeated to obtain a ZIF-8@(Au@ZIF-8) loaded with n layers of AuNCs. n The present invention significantly improves the effective utilization rate of assembly space and fluorescence performance, and realizes ultra-sensitive detection of fluorescence immunoassay.

The application belongs to the technical field of biomedical application of nanomaterials, and discloses a magnetic graphene nanocapsule as well as a preparation method and application thereof. The application provides a magnetic graphene nanocapsule, wherein the magnetic graphene nanocapsule is of a core-shell structure, the core is a magnetic metal, and the shell layer is a magnetic graphene nanocapsule, compared with traditional magnetic metal oxides, the heat production capacity and acid resistance are significantly enhanced, and stable hyperthermia conditions can be provided in the stomach. The application further provides a preparation method of the magnetic graphene nanocapsule, wherein inexpensive and readily available raw materials such as metal chloride and nitrate are used, the synthesis conditions are simple, and the method is suitable for mass production. The obtained magnetic graphene nanocapsule can enter a specified site through oral administration, such a drug administration mode can avoid the problems of liver accumulation and side effects of nanoparticles after entering the blood, and potential toxicity of nanoparticles after entering the systemic circulation is avoided.

The application discloses a method for detecting polychlorinated biphenyl by using an electrochemical aptamer sensor. x The sensor comprises a glassy carbon electrode, a surface of a detection end of the glassy carbon electrode is decorated with an electroactive nanomaterial, the electroactive nanomaterial comprises Ti3C2T 0000001 Nanosheet, a conductive polymer material is embedded in an interlayer structure of the nanosheet and forms a composite nanomaterial, and gold nanoparticles are deposited on a surface of the composite nanomaterial; a capture chain is self-assembled on the electroactive nanomaterial, a specific aptamer probe is combined on the capture chain, a DNA double-stranded structure is formed, and an electroactive label is introduced. In the application, the sensor has the advantages of wide detection range, low detection limit, strong anti-interference ability, good stability and the like, can realize specific detection of polychlorinated biphenyl, has the advantages of low cost, short time consumption, high accuracy, good adaptability and the like, and has important significance for rapid detection of polychlorinated biphenyl.

The application discloses a high-durability micro-nano structure carbon ceramic composite brake disc and a preparation method thereof. Gradient nanoparticle distribution is used to realize the synergistic optimization of surface protection and core Si infiltration efficiency. A high SiC concentration is used in the surface layer to inhibit the corrosion of molten Si through a double mechanism of physical blocking and chemical passivation, and the friction coefficient fluctuation is significantly reduced. A low SiC concentration is used in the outer layer to reduce the penetration resistance of molten Si, ensure the uniformity of Si infiltration, and reduce the difference in the thermal expansion coefficient. Meanwhile, the lamination needling process improves the performance through a double mechanism of mechanical interlocking and fiber orientation optimization. The needling density of 12-20 needles per unit area makes the barb of the needle penetrate the carbon fiber layer to form a physical anchor, the needling process optimizes the Si infiltration channel, the interlayer gradient structure and the three-dimensional network formed by needling disperse the braking stress, and the interface debonding risk is reduced. In the high-strength frequent braking scene, the crack initiation probability is reduced, the local stress of the brake disc is reduced, the wear rate is effectively reduced, and the braking process is more stable.

This invention discloses a Sn3O4-Ag-Ag2O photoelectric material based on TiO2 nanotubes and its preparation method, belonging to the field of photoelectric materials technology. The invention uses a hydrothermal Sn3O4-Ag-Ag2O nanoparticle method on a TiO2 nanotube array to construct an indirect Z-type heterojunction. The material exhibits high photocatalytic activity in dye degradation and water decomposition to produce hydrogen. The prepared sample showed strong photocatalytic ability and stability in organic dye degradation and Cr(VI) removal, with a visible light-driven photocatalytic hydrogen production rate of 55.79 μmol·cm ‑2 ·h ‑1 Photoelectrocatalytic data and electron spin resonance (ESR) signal results indicate that the composite photoelectrode forms an indirect Z-type electron transfer pathway, providing guidance for the preparation of composite photoelectrode materials with high optical and photocatalytic properties. The Z-type heterojunction structure will show broad application prospects in the design and application of photocatalysts.

This invention discloses a dodecahedral Co-C / LDH composite electrode material loaded with bismuth nanoparticles, its preparation method, and its application. The composite material has a dodecahedron formed by a Co-C amorphous carbon layer as the core, an outer NiCoAl-LDH layer, and a surface loaded with Bi nanoparticles, forming a unique three-dimensional core-shell structure. Co-C / NiCoAl-LDH@Bi is assembled as the anode and AC as the cathode. The Co-C / NiCoAl-LDH@Bi / / AC device improves the Cl... ‑ Storage capacity, electrochemical reaction kinetics, and long-term cycling stability expand the application boundaries of LDH materials in the field of high-performance CDI anodes, providing high-performance material support for the practical application of CDI technology in seawater desalination. It is expected to promote the development and implementation of low-cost, large-scale seawater desalination systems and has important industrial application prospects and environmental value.

The application relates to the technical field of grinding, in particular to a boron nitride grinding liquid and a preparation method thereof. The boron nitride grinding liquid comprises the following preparation raw materials in parts by mass: modified boron nitride 18-22 parts, a suspension synergist 2-3 parts, a stabilizer 3-4 parts, a dispersing agent 1-2 parts, an accelerator 3-5 parts, nano particles 0.1-0.2 parts and a solvent 60-65 parts, wherein the suspension synergist is prepared by mixing isododecanic acid and ricinoleic acid. The boron nitride grinding liquid has the advantages that the abrasive still maintains good suspension under long-time shearing action, has long cycle life and high grinding efficiency; the grinding liquid has excellent dispersion effect, can effectively disperse the nano particles generated in the grinding process, avoids adsorption to the abrasive surface, avoids generation of agglomerated large particles and reduces scratches generated in the grinding.

The invention relates to the field of C / C-SiC composite materials, and discloses a reinforcement which is sequentially provided with a pyrolytic carbon interface layer, a TiC-carbon composite interface layer and a SiC layer from inside to outside. Wherein the TiC-carbon composite interface layer comprises nano TiC particles and resin carbon, the nano TiC particles are arranged in the pyrolytic carbon interface layer and the SiC layer in a pinning manner, and the resin carbon provides a carbon source for the SiC layer. A reaction carbon source is provided for the SiC layer through the TiC-carbon composite interface layer, the PyC interface strength is reserved, meanwhile, through pinning of nano TiC particles at the interface, crack propagation is controlled, the composite material interface connection strength is improved, TiC and silicon can generate an anti-oxidation barrier composed of Ti5Si3 and Ti3SiC2, and the stability of a material friction layer is improved.

The invention discloses a modified epoxy insulator for reducing surface charge accumulation and a preparation method thereof, and the method comprises the following steps: (1) dissolving dried nano Al2O3 particles in a curing agent, and dispersing to obtain a nano particle curing agent solution; (2) mixing the nano particle curing agent solution, epoxy resin and an accelerant in a vacuum environment, and curing to obtain a nano modified insulator sample; and (3) carrying out ultrasonic treatment on the nano-modified insulator sample by adopting absolute ethyl alcohol, drying, and then carrying out ozone treatment to obtain the modified epoxy insulator capable of reducing surface charge accumulation. According to the invention, material body transport capability can be reduced, charge accumulation through body transport is inhibited, insulator surface conductance is enhanced, and surface charge dissipation is accelerated.

The invention relates to a cross-wavelength response integrated biosensor which comprises a plurality of periodic units, and each periodic unit comprises a substrate layer, a dielectric layer and a metal layer which are sequentially arranged from top to bottom; the metal layer comprises a plurality of metal structure units, each metal structure unit comprises a metal wire and two discrete metal split rings, and the metal wire and the metal split rings are formed by nano particle arrays. According to the invention, a plurality of independent sensors are not needed, and high-sensitivity sensing response of the THz wave band and the optical wave band can be realized only by a single integrated structure; in a single sensor, high-sensitivity detection of biomolecules from small to sub-nanometer scale and from large to micron scale can be realized at the same time; on the microscopic scale, the THz resonance sensitivity of the sensor can reach 63.9 GHz / RIU; on the nanoscale, when the incident wavelength is 785 nm, the SERS enhancement factor of the sensor is 8.8 * 10 < 4 >; the response performance of the biosensor can be realized by optimizing the structural parameters, geometrical shapes, unit arrangement and the like of the metal layer.

The present invention relates to the field of lens technology, and in particular to a film and lens for vision correction. The film for vision correction is deposited on the surface of a lens substrate, comprising a refractive index matching layer, a refractive compensation layer, a defocus prevention and control layer, an anti-blue light interference layer and a super-hydrophobic wear-resistant layer arranged in sequence from bottom to top; the refractive compensation layer covers the entire aperture and forms an optical zone for refractive correction in the central area, and the film thickness of the refractive compensation layer decreases from the center to the edge; the defocus prevention and control layer covers an annular area around the optical zone, including an annular transition zone and a main defocus area extending outward from the outer edge of the annular transition zone; the defocus prevention and control layer is composed of a ZrO2-epoxy resin composite; the film thickness in the annular transition zone increases linearly from the inside to the outside, and a radial electric field is induced to gradually change the concentration of ZrO2 nanoparticles to form a radial gradient of refractive index, the concentration of ZrO2 nanoparticles in the main defocus area is constant, and the peripheral defocus is maintained by a secondary increase in film thickness.

The invention relates to the field of layer structures, and particularly discloses a high-light-transmittance and high-flexibility hard coating film and a preparation method thereof. The invention discloses a hard coating film with high light transmittance and high flexibility. The first initiator is prepared from polybutadiene A-polyurethane-acrylate resin, polybutadiene B-polyurethane-acrylate resin, high-transmittance nano particle-acrylate composite resin and a second initiator, and the second initiator is prepared from 2-methyl-1-(4-methylthiophenyl)-2-morpholine-1-acetone and 2-isopropyl thioxanthone. The hard coating film obtained by the invention has a layer structure and has the double characteristics of high light transmittance and high flexibility, the pencil hardness is not lower than 3H, the elongation at break is not lower than 4.9%, the light transmittance is not lower than 92.5%, the toughness value is not lower than 0.949 MJ / m < 3 >, the application range is wide, and the hard coating film has high use value.

The application discloses a micro electrochemical sensor for detecting amyloid polypeptide A beta 1‑42 and a preparation method and application thereof. The preparation method comprises the following steps: taking an acupuncture needle as a bare electrode, sequentially modifying tetrachloroauric acid trihydrate-gold nanoparticles, single-wall carbon nanotubes, hemin, amyloid polypeptide A beta 1‑42 template molecules, mixed polydopamine and ion liquid to form an imprinting polymer, and then eluting to obtain the micro electrochemical sensor ANME / / hemin / / SMIP electrode. The micro electrochemical sensor can be used for high-sensitivity detection of amyloid polypeptide A beta 1‑42 , and realizes specific detection of amyloid polypeptide A beta 1‑42 .