1650 results about "Nanostructure" patented technology

The invention provides a flexible palladium film hydrogen sensor and a preparation method thereof, the flexible palladium film hydrogen sensor is sequentially provided with a flexible substrate, a hydrogen sensitive sensing layer and a contact connection layer from bottom to top, and the contact connection layer is connected with a resistance measurement unit; and the hydrogen-sensitive sensing layer is a palladium or palladium alloy film with a conical micro-nano structure. The palladium or palladium alloy thin film with the conical micro-nano structure provides a hydrogen sensor conical surface micro-nano structure with a high specific surface area for the flexible palladium thin film hydrogen sensor, and the process that hydrogen is adsorbed, dissolved and diffused into the palladium or palladium alloy thin film is accelerated, so that the response speed of the sensor is increased; according to the hydrogen sensor, the flexible substrate is adopted, so that the hydrogen sensor can be conveniently arranged in various narrow spaces, and the applicability of the hydrogen sensor in various scenes is improved.

The invention discloses a total-space near-far field regulation and control method based on a coherent pixel super-structure surface. The method comprises the following steps: 1) constructing a nano-structure unit and a super-unit; 2) optimizing the structural parameters of the nano-structure unit according to the incident light wavelength lambda, and verifying the regulation and control effects of the super-unit I and the super-unit II; and 3) constructing a nano-structure array, wherein the nano-structure array comprises a plurality of super-units I and super-units II. Left-handed / right-handed circularly polarized light is set to be incident to the surface of the single-layer metastructure, binary nano printing of an image is achieved in a near field, and near-field nano printing intensities in a transmission space and a reflection space are complementary; different holographic patterns are respectively presented in the far-field transflective space, and the far-field transflective channels are regulated and controlled by mutually independent and continuous phases. By properly designing the single-layer nano brick, continuous and independent phase control of reflection and transmission spaces can be realized without additional equipment, far-field holographic imaging and near-field nano printing can be realized, and the single-layer nano brick can be applied to the fields of depth detection, three-dimensional imaging, optical encryption, high-resolution image storage and the like.

The invention discloses a biomass-based reinforcing agent for paper and application of the biomass-based reinforcing agent. The reinforcing agent comprises a biomass-based material, the biomass-based material comprises a micron-sized structure and a nano-sized structure distributed on the micron-sized structure. The reinforcing agent prepared by the invention has abundant nanostructures, is beneficial to physical crosslinking such as entanglement and bridging of fibers in paper pulp, and improves the wet strength of paper; the preparation of the reinforcing agent is a simple physical process, and a complex synthesis chemical process for synthesizing a polymer in a traditional organic reinforcing agent is avoided; the reinforcing agent is prepared by a dissolution regeneration method, so that the energy consumption is low, the solvent can be recycled and reused, no chemicals are consumed, and the reinforcing agent is environment-friendly; the reinforcing agent prepared by the invention can achieve a satisfactory wet strength effect at a lower content.

The invention provides a chiral super-structure surface and a dynamic regulation and control method for circular dichroism of the chiral super-structure surface, and belongs to the technical field of micro-nano optics. The chiral metasurface can perform differential absorption on vertically incident left-handed circularly polarized light and right-handed circularly polarized light. The chiral metasurface comprises: a substrate layer; the optical waveguide layer is arranged on the substrate layer; the nano structure layer is arranged on the optical waveguide layer and comprises a plurality of Z-shaped nano units which are periodically arranged in a square shape; and the hydrogel layer is arranged on the optical waveguide layer and the plurality of Z-shaped nano units and is used for dynamically regulating and controlling the circular dichroism of the chiral super-structure surface when the environment humidity changes. Under the condition that high circular dichroism of the chiral super-structure surface is achieved, the circular dichroism of the chiral super-structure surface is made to move when the environment humidity changes, and therefore the circular dichroism of the chiral super-structure surface is dynamically regulated and controlled.

A method for producing an abrasion-resistant nanostructure (40) on a surface (5) of a support body (2) is proposed in order to permanently provide the support body (2) with advantageous surface effects. The method can be used, in particular, to permanently anchor nanostructures (40) to a surface (5) in an abrasion-resistant manner. For this purpose, in a first process step A, the nanostructure (40) is first applied to or produced on the surface (5), in particular by growing it. In a subsequent process step B, the nanostructure (40) produced in step A is then permanently and abrasion-resistantly bonded to the surface (5) by means of a separate embedding layer (20). For this purpose, the embedding layer (20) is produced separately from the already produced nanostructure (40) on, in particular on and / or in, the surface (5).The embedding layer (20) only partially covers the nanostructure (40), so that surface properties of the nanostructure (40) can be at least partially preserved. At the same time, the embedding layer (20) anchors the nanostructure (40) to the surface (5), whereby the embedding layer (20) can grow into the support body (2), in particular through the nanostructure (40).

The invention discloses a TGV through hole filling method based on magnetic field assisted electrochemical deposition, and belongs to the technical field of TGVs. According to the method, the filling quality of the TGV through hole is remarkably improved, the void ratio is reduced, and the packaging reliability is improved; magnetic field assistance and gradient pulse electroplating processes are adopted, so that the electroplating efficiency is improved, and the production period is shortened; meanwhile, due to nanostructure modification and the design of the TiN transition layer, the adhesive force between metal and the hole wall of the glass is enhanced, and the stability of the overall structure is improved.

The invention discloses a heat-resistant aluminum rare earth alloy wire containing a two-phase nanostructure and a preparation method of the heat-resistant aluminum rare earth alloy wire, and belongs to the field of non-ferrous metal materials. According to the alloy, aluminum serves as a matrix, and the alloy further comprises, by mass, 0.005%-0.2% of Ce, 0.05%-0.25% of Er, 0.05%-0.25% of Yb, 0.1%-0.2% of Zr and 0.05%-0.2% of Fe. The alloy wire prepared by combining two-stage homogenization, hot extrusion and cold drawing processes contains an Al3 (RE, Zr) nano precipitated phase and a nanoscale Al13Fe4 dispersed phase, the inner layer of the Al3 (RE, Zr) nano precipitated phase is Al3RE, and the outer layer of the Al3 (RE, Zr) nano precipitated phase is Al3Zr; and the nanoscale Al13Fe4 dispersed phase is a nano precipitated phase formed by sequentially coating the outer layer of an Al13Fe4 phase with an Al3RE structure and an Al3Zr structure. The alloy provided by the invention has excellent strength, high-temperature service stability and conductivity.

The invention discloses a nanostructure thermal protection coating resistant to long-time high-temperature oxidation and a preparation method thereof.The nanostructure thermal protection coating takes a ceramic matrix composite material as a matrix, and a bonding layer and a composite component coating are sequentially sprayed to the surface of the matrix. Preparing a nano-structure self-healing additive / Re2Si2O7 spherical powder body; preparing a bonding layer on the surface of the ceramic-based composite material serving as a matrix; and 3, depositing the nano-structure self-healing additive / Re2Si2O7 spherical powder on the surface of the bonding layer to form the composite component coating. According to the preparation method, the self-healing additive / Re2Si2O7 is prepared into the nano-structure spherical powder suitable for thermal spraying for the first time, and a method is provided for implementation of the high-performance material on a thermal spraying nano-structure coating. The prepared coating is stable in phase structure at high temperature, phase change of powder is avoided in the spraying process, and the coating has good thermal expansion coefficient matching performance with a base body.

A semiconductor structure includes a substrate; first nanostructures suspended over and vertically arranged over the substrate; a first gate structure wrapped around each of the first nanostructures; and gate spacers formed on opposite sides of the first gate structure and over a topmost one of the first nanostructures. The semiconductor structure further includes first source / drain features attached to opposite sides of the first nanostructures; and a first bottom dielectric layer formed over the substrate and below the first nanostructures. The first bottom dielectric layer is vertically sandwiched between the substrate and the first gate structure.

The invention provides a micro-nano optical fiber probe for biochemical component detection based on infrared spectroscopy and detection equipment, and a preparation method of the micro-nano optical fiber probe comprises the following steps: S1, selecting one section of a multimode quartz optical fiber as a sensing area, and then removing a cladding layer and a coating layer of the sensing area to expose a bare fiber; s2, dripping a mixed acid solution prepared from hydrofluoric acid and citric acid to the bare fiber to corrode the bare fiber, and then cleaning and blow-drying; immersing the treated multimode quartz optical fiber into a silane coupling agent solution, reacting for 0.5-1 hour, and then drying; s3, immersing the multimode quartz optical fiber treated in the step S2 into a solution containing silver nanoparticles, and reacting for 10-20 minutes to obtain an optical fiber modified by the silver nanoparticles; and S4, sputtering a gold layer on the surface of the silver-modified optical fiber by adopting a vacuum magnetron sputtering technology to obtain the micro-nano optical fiber probe with the silver-gold film layer. After the surface of the silver nanostructure is covered with the gold film, oxygen, water, corrosive molecules and the like are effectively prevented from making direct contact with silver. In addition, both the gold and the silver can support a surface plasmon resonance (SPR) effect, and particularly, the prepared detection equipment can ensure the sensitivity of the SPR.

The invention discloses a two-dimensional bionic nanostructure assembled based on receptor-ligand acting force and a preparation method of the two-dimensional bionic nanostructure. The core characteristic of the two-dimensional bionic nanostructure is that the ultrafine particles modified by ligand molecules are anchored on the surface of a cell membrane fragment with a corresponding receptor expressed on the surface through a receptor-ligand effect, so that uniform compounding of the ultrafine particles and the cell membrane is realized; the bottlenecks of low compounding efficiency, functional site masking and the like caused by high surface curvature of small-size particles in the traditional cell membrane complete wrapping technology are broken through. According to the preparation method disclosed by the invention, the binding force between the cell membrane and the ultramicro particles is stronger, the off-target phenomenon of the ultramicro particles in the in-vivo circulation process can be avoided, the response release of the ultramicro particles under the competition effect in a lesion region expressed by a high-abundance receptor can be realized, and the preparation method has a good application prospect in the aspect of precise drug delivery. Meanwhile, the in-vivo circulation time of the ultrafine particles is prolonged by membrane loading, the biocompatibility of the ultrafine particles is improved, and the effectiveness and low toxicity of a drug delivery system are ensured.

The invention discloses a three-fluid three-dimensional flow guide spinning head, electrostatic spinning equipment and a batch preparation method of three-chamber embedded parallel structure nanofibers, three different fluids are synchronously guided into a high-voltage electrostatic field by simultaneously arranging a plurality of nozzle outlets with combined structures, and a plurality of complex combined nozzle outlets are used as macroscopic templates, so that the three-chamber embedded parallel structure nanofibers are prepared under the high-voltage electrostatic field. Through interaction of a high-voltage electrostatic field and fluids, batch preparation of the three-chamber embedded and column-structured nanofibers by multi-fluid common electrospinning is realized. The three spinning solutions are guided to a common outlet through the first series of metal capillary tubes, the second series of metal capillary tubes and the spinning solution insulating container respectively; the first series of metal capillary tubes and the second series of metal capillary tubes are respectively dispersed from respective capillary tube gathering inlets, penetrate through the interior of the spinning solution insulating container to the bottom of the spinning solution insulating container and vertically penetrate out to form a plurality of outlets which are parallel in pairs; a through hole outlet is formed in any parallel outlet at the bottom of the spinning solution insulating container to form a common outlet of the three spinning solutions, and the three-chamber embedded and arrayed nano structure is directly prepared in batches in a single step.

The invention relates to the technical field of optical materials and nano structures, in particular to an ultraviolet broadband light absorber based on graphene and a multi-layer periodic structure. The structure of the ultraviolet broadband light absorber sequentially comprises a graphene layer, a distributed Bragg reflection grating structure layer and a SiO2 substrate at the bottom from top to bottom. The preparation process of the ultraviolet broadband light absorber comprises the following steps: preparing the graphene layer; a SiO2 layer is deposited; depositing a TiO2 layer; carrying out multi-layer superposition; adding a graphene layer; and completing the device. The light absorption efficiency of graphene in the ultraviolet band is greatly improved, broadband efficient absorption within the wavelength range of 240-370 nm is achieved, the highest absorption rate can reach 99.75%, the absorber is not sensitive to polarization, the preparation process is simple, and technical support is provided for design of the efficient ultraviolet absorber.

A near-far field encryption method based on singular point amplitude characteristics comprises the following steps: 1) constructing a nano structure unit which is composed of a substrate and nano bricks deposited on the substrate; 2) optimizing parameters: optimizing the structural parameters of the nano brick through CST electromagnetic simulation software according to the selected working wavelength; 3) determining the structural parameters of the EP, and determining a singular point EP by using CST electromagnetic simulation software by changing the structural parameters of the nano brick; 4) determining phase distribution of the two holographic images IA and IB; (5) arranging a nanostructure array: according to the phase distribution of the two holographic images IA and IB determined in the step (4), obtaining a PB phase by changing the rotating angles of the two nano bricks to meet the phase distribution; (6) observing the nano array arranged in the step (5), enabling RCP light to enter from the front surface of the metasurface, detecting a first hologram IA on a reflecting surface, and displaying a pattern IC in a near field; lCP light is incident from the front surface of the metasurface, a second hologram IB can be detected on the reflecting surface, and a complementary pattern of the pattern IC is displayed in a near field. The method is ingenious in design, the phase information of the unit structure is manipulated, the near-field pattern is achieved through the amplitude difference, and the method can be used for simultaneous encryption of the near field and the far field.

The invention discloses a design method for realizing a virtual polarization element, relates to the field of optical device design, and aims to solve the problems of large size, difficulty in integration and limited regulation and control capability of a traditional polarization device. According to the method, a virtual polarization function (including a Jones matrix and an additional phase) is preset on a target plane, a plane wave weighting factor is solved through high-dimensional Fourier transform, and source plane light field distribution is generated through superposition. The metasurface is used as a platform, and accurate mapping from a source plane Jones matrix to a device structure is realized by adjusting geometric parameters of a nanostructure and combining a double-matrix holography. According to the design scheme, a polarization state with controllable spatial distribution can be generated as required in a two-dimensional plane at any propagation distance, and additional phase information can be flexibly superposed, so that the flexibility, precision and integration capability of light field regulation and control are remarkably improved, and technical support is provided for applications such as new-generation lens-free imaging, polarization coding communication, light field synthesis and the like.

Interbody implants formed by disposing a polymeric body between superior and inferior metallic endplates and the methods of forming the implants are disclosed. In some embodiments, the interbody implant comprises a plurality of porous and non-porous metallic sheets that are bonded to form metallic endplates. In various embodiments, a polymeric body may be infilled between the superior metallic endplate and inferior metallic endplate by an injection molding process. In various embodiments, the metallic endplates may comprise a plurality of grooves produced by a subtractive manufacturing process. In various embodiments, the metallic endplates may further comprise providing a surface treatment to produce nanoscale metallic oxide nanostructures.

The invention discloses a design and implementation method of a near-infrared light-splitting super lens, and relates to the technical field of super lenses. The super lens is composed of a rotational symmetric structure, so that polarization insensitivity is achieved, incident broadband light can be dispersed to different positions of the same focal plane according to different wavelengths through ingenious optical design, an effective light splitting effect is achieved, and the polarization insensitivity of the super lens is improved by adjusting geometric parameters and shapes of the super lens nano structure units. The positions of light with different wavelengths on a focal plane can be accurately controlled; in the optimization process, a particle swarm optimization algorithm is adopted to reduce errors, and performance attenuation and optical distortion caused by dispersion can be effectively reduced by adjusting dispersion characteristics and geometric parameters of the nano-structure units, so that the precision and reliability of light splitting are improved, and the light splitting precision is improved. The identification capability of the laser detection system is greatly improved, and integration and miniaturization are realized.

The invention discloses an azobenzene polymer material and an application of the azobenzene polymer material in nanoimprint lithography. The azobenzene polymer is prepared by adopting a one-step simple ring-opening metathesis polymerization method, is endowed with excellent thermal stability and light stability, and can keep excellent performance under the conditions of high temperature and sunlight irradiation. Compared with the traditional nanoimprint photoresist, the nanoimprint photoresist provided by the invention has higher stability and precision in the nanoimprint process, can effectively reduce the problems of distortion, blurring and the like of an imprint pattern, and ensures the accuracy of nanostructure transfer printing. The finished product quality and the production efficiency are improved, and meanwhile, the uncertainty and the cost in the manufacturing process are reduced.

A composite, comprising a binder, the binder comprising one or more of polymeric, metallic, or ceramic, or pyrolytic carbon binder and a nanostructured carbon having a cellular structure. The cellular structure comprises one or more cell walls having a structure formed by a template and one or more cavities. Each cavity is substantially enclosed by the one or more cell walls and substantially unimpregnated by a liquid or solid.

The invention discloses a preparation method of an ultra-infiltration nano coating, and relates to the field of ultra-infiltration nano coatings, and the preparation method comprises the following steps: S1, base material pretreatment, S2, nano material dispersion liquid preparation, S3, coating: adopting an impregnation method, a spraying method or a spin-coating method to attach the nano material dispersion liquid prepared in the step S2 to the surface of the base material pretreated in the step S1, and S4, low-temperature curing to obtain the ultra-infiltration nano coating. And S5, surface modification: carrying out hydrophobic modification or hydrophilic modification on the base material subjected to low-temperature curing in the step S4 according to the type of the base material. The effect of enhancing the adhesive force of the base material and the coating is achieved through the means of pretreating the base material, it is ensured that nano particles of the dispersion liquid are always uniformly dispersed through preparation of the nano material dispersion liquid and the coating, coating is conducted through proper methods such as dipping, spraying and spin coating, and then low-temperature curing is conducted; the effect of constructing a stable porous nano-structure coating with excellent performance is achieved, and meanwhile, different requirements are met through multiple coating modes.

The invention discloses a deoxidizer for metal smelting and a preparation process thereof, and belongs to the technical field of steel for high-strength fasteners, and the deoxidizer comprises aluminum powder, silicon powder, titanium powder, zirconium powder and carbon-coated lanthanum nano powder in a mass ratio of (45-50): (20-25): (15-20): (8-12): (0.2-0.4). In a sol crystallization stage, lanthanum nitrate and a composite ligand form a directionally growing metal organic framework under the assistance of an external field, and a regular pore structure of the metal organic framework provides a nano-scale template for subsequent carbon coating, so that the decomposed organic ligand is gradually carbonized in a segmented heating process and forms a gradient structure; the low-temperature section promotes the carbon layer to be converted from an amorphous state to an ordered state so as to enhance the electron conduction capability, and the high-temperature section forms a through mesoporous network through external energy etching, so that excessive agglomeration of lanthanum nanoparticles is limited, and a controllable release channel is constructed. The preheating and pre-pressurizing process provides support for the nanostructure on the macroscopic scale, and the aluminum powder is softened through low-temperature plastic deformation to fill gaps of the titanium-zirconium powder, so that a compact initial blank structure is formed.

The invention relates to a device (1) for imaging micro- and / or nanostructures, in particular structures on microlithography masks. The device (1) comprises an illumination device (10) for illuminating an object (20) with illumination radiation and an image capture unit (40) for capturing the illumination radiation transformed by the object (20), wherein the device (10) is designed to be focusable, wherein the image capture unit (40) comprises at least two image capture sensors (45, 46, 47) which are arranged such that at least one image capture sensor (45, 46, 47) is defocused regardless of the focusing of the device (1).

An anode assembly for an X-ray tube and an X-ray tube wherein the anode assembly for an X-ray tube comprises: an anode target having a bombardment surface for receiving an electron beam emitted in a first direction to generate an X-ray; and the first nano-structure layer at least covers the bombardment surface, and the first nano-structure layer is used for absorbing the first electrons on the bombardment surface. According to the technical scheme, the service life of the X-ray tube can be prolonged, and the working efficiency of the X-ray tube is improved.

The invention discloses an optical metasurface structure parameter design model training and application method and a related device, and relates to the technical field of nanometer photonics nanometer structure design, the method comprises the following steps: obtaining a data set, the data set comprises multiple groups of sample data of each optical metasurface in a plurality of optical metasurfaces, the sample data comprises a sample structure name, a sample structure parameter and a sample spectral response, word embedding and position code embedding are respectively carried out on the sample structure name and the sample structure parameter to obtain an embedded sample structure name and an embedded sample structure parameter, a feature extractor is further utilized to extract and obtain a fusion feature, and the fusion feature is extracted to obtain a fusion result; and taking the fusion features as input, generating an embedded sample structure parameter predicted value by using a structure parameter generator, subsequently calculating total loss, and performing iterative updating based on the total loss until training is completed. The method can be suitable for design of structure parameters of optical metasurface of different structure types and different spectral targets, and generalization ability is improved.

The invention provides a self-cleaning liquid crystal display screen system based on nanostructure enhancement, and relates to the technical field of liquid crystal display screens, the self-cleaning liquid crystal display screen system comprises a liquid crystal display panel, a reconfigurable surface phonon polariton regulation and control layer, a pollutant identification module, an excitation source module, a central control processing unit and an energy recovery module, by dynamically tuning the surface phonon polariton resonance characteristics of the reconfigurable surface phonon polariton regulation and control layer micro-nano structure unit, selective resonance coupling with a target pollutant detected by the pollutant identification module is carried out, and selective activation is carried out by an excitation source. High-selectivity energy transfer generated by resonance causes molecular decomposition or generates field gradient force to achieve physical effects such as particle stripping migration, pollutants are efficiently and intelligently removed, and meanwhile the integrated energy recovery module collects panel waste heat and converts the panel waste heat into driving energy to assist system operation so as to improve energy efficiency. The problems of poor selectivity, low efficiency, high energy consumption and screen damage in the traditional technology are solved.

The present invention discloses a nanoparticle transport device, comprising a silica substrate, a droplet-shaped gold nanoarray, polarized light waves, and nanoparticles; the silica substrate serves as a substrate; the droplet-shaped gold nanoarray is disposed on the silica substrate and serves as a driving unit, interacting with the polarized light field to form an excited local electric field to capture and directionally transport nanoparticles; the polarized light wave is used to provide a light source, interacting with the droplet-shaped gold nanoarray to generate an evanescent field; the nanoparticles serve as the objects to be captured and transported; the droplet-shaped gold nanoarray includes a periodically arranged droplet-shaped plasma gold nanostructure, which is composed of a droplet-shaped tail and a circular body, and the transport direction of the nanoparticles forms a certain angle with the droplet-shaped tail. The present invention can achieve more stable capture with lower light power, and also enables the device to achieve highly operational transport of target particles.

The invention relates to the technical field of functional materials, and discloses a bionic hydrophobic anti-corrosion coating construction method which comprises the following steps: S1, substrate pretreatment: performing ultrasonic cleaning on a metal substrate to remove surface oil stains and oxides; s2, laser-electrochemical composite texturing: manufacturing a micron-nano hierarchical structure on the surface of the base material by adopting femtosecond laser, and then growing a metal organic framework layer on the nano structure in situ by adopting an electrochemical method; s3, plasma activation: bombarding the surface of the metal organic framework layer by adopting Ar / O2 mixed plasma; s4, carrying out gradient fluorosilane grafting; s5, filling the dynamic covalent network; and S6, roll-to-roll continuous coating is carried out. Through a laser-electrochemical composite texturing technology and a gradient fluorosilane grafting technology, the problems that a traditional hydrophobic coating is single in structure and poor in binding force are solved, and the effects that a micron-nano hierarchical structure is constructed on the surface of a metal base material, molecular gradient arrangement is formed, the hydrophobic performance is improved, and the interface binding strength is enhanced are achieved.

The invention belongs to the technical field of kitchen ware coatings, and discloses a preparation method of a wear-resistant coating based on nano structure optimization, through a specific ratio of nano silicon carbide, titanium dioxide, boron nitride and silver, four particles form a complementary and synergistic functional system-silicon carbide provides a hardness basis, boron nitride optimizes the antifriction performance by means of a layered structure, and the wear-resistant coating is prepared. Titanium dioxide enhances the chemical stability; by matching with a composite dispersion process of high-energy ball milling and ultrasonic treatment, particle aggregation is broken, so that the coating forms a uniform and compact nano-structure, the structure can effectively disperse friction stress, the wear resistance is remarkably improved, and the service life of the kitchen ware in a high-frequency cooking friction environment is greatly prolonged; a kitchen ware substrate is subjected to 80-mesh white corundum sand blasting to form a rough surface, then impurities are removed through ultrasonic cleaning, and a good interface condition is created for coating adhesion; and a subsequent stepped vacuum curing process promotes chemical bonding of the nanoparticles and the polyimide resin, and the binding force of the interior of the coating and the binding force of the coating and the substrate are enhanced.

The application relates to a modified separation membrane in the technical field of membrane materials, a preparation method and application thereof. The modified separation membrane comprises a base film and a nanostructure layer on the upper surface of the base film and the membrane hole surface close to one side of the upper surface of the base film; wherein the pore size of the base film is 120-400 mu m; the nanostructure layer is composed of microparticles with a size of 100-1000 nm; the preparation method comprises 3D printing of the separation membrane; and the upper surface of the separation membrane and the membrane hole surface close to one side of the upper surface of the separation membrane are subjected to plasma treatment. The modified separation membrane preparation method combines the 3D printing technology and the membrane separation technology, improves the traditional membrane preparation process, finds a more optimal membrane replacement process, and the modification method is free of chemical agents, has the advantages of being more convenient and fast to operate, high in separation efficiency, low in processing cost, green and pollution-free, and the like, and has important significance in the aspects of membrane separation technology improvement and application of oily wastewater treatment.

The invention provides a metasurface design method. The metasurface design method comprises the steps that metasurface efficiencies corresponding to different film layer parameters are calculated through simulation software; selecting ideal film layer parameters to form a multilayer film structure, wherein the metasurface efficiency corresponding to the ideal film layer parameters is not lower than a first threshold value; a nano structure is formed by adopting a multi-layer film structure, and nano structure arrangement is carried out; the multi-layer film structure is constructed through the screened ideal film layer parameters, the resonance effect can be reduced under the condition that the phase requirement range is large, the situation that the transmittance or reflectivity of a nano structure is suddenly reduced is avoided, and therefore high-efficiency metasurface design is achieved.