275 results about "Nanoscopic scale" patented technology

The invention discloses a cross-scale rock elastic mechanical parameter measurement method and system, and relates to the technical field of rock measurement, and the method comprises the following steps: obtaining nano-scale rock elastic mechanical parameters and micro elastic-plastic deformation of rock through a nanoindentation experiment, so as to construct a molecular dynamics model of the rock; according to the molecular dynamics model of the rock, using an inclusion homogenization theory to upgrade the rock elastic mechanics parameters of the nanoscale to the rock elastic mechanics parameters of the centimeter scale, so as to construct a rock elastic mechanics parameter conversion model, and using environmental data in an in-situ environment for correction; and inputting the nano-scale rock elastic mechanical parameters into the corrected rock elastic mechanical parameter conversion model to obtain centimeter-scale rock elastic mechanical parameters. According to the invention, centimeter-scale rock elastic mechanical parameters in a deep stratum in-situ environment can be accurately measured.

The invention provides a micro-nano impact press-in tester operation monitoring system based on digital twinning, and is suitable for the field of precise instrument maintenance. The system realizes multi-physical field coupling modeling in a micro-nano press-in test through a digital twinning technology, and can monitor the state of an instrument in real time with high precision, predict faults and perform dynamic optimization. The system is integrated with a high-precision sensor, data such as micro force, extremely high temperature and nanoscale displacement are collected in real time, a digital twin model is constructed, and the operation state of an instrument is mapped. Historical and real-time data are analyzed by means of a machine learning algorithm, potential faults can be accurately predicted, maintenance suggestions can be provided, and the precision retentivity and the test stability of the instrument under the material service working condition are ensured. The interaction center provides a visual interface, supports real-time monitoring, dynamic adjustment and early warning functions, and remarkably improves the intelligent maintenance level of the instrument. The invention is suitable for the fields of material science, micro-nano mechanical test and the like, and provides an innovative precise instrument intelligent management scheme.

The invention provides a rapid self-driven anti-icing material and a preparation method thereof. The rapid self-driven anti-icing material comprises a modulus span formed by at least two materials, a Z-axis perpendicular to a substrate direction, and an upper'hard (high-modulus material) 'structure and a lower'soft (low-modulus material)' structure distributed along the Z-axis direction, the surface of the large-area rapid self-driven anti-icing material is provided with a microstructure (micron-scale or nano-scale, continuous or discontinuous, isotropic or anisotropic wrinkles, micro-columns, grooves, inverted triangular bulges and the like). And the surface has an isotropic continuous wrinkle structure (figures), and has modulus span (hard at the upper part and soft at the lower part) in the Z-axis direction. The material can realize zero-energy-consumption deicing (only under the action of self gravity of ice deposits or wind power) without depending on a lubricating layer.

The invention discloses a preparation method of a large-area and distance-adjustable gold nanoparticle single-layer superlattice film and a product and application thereof, and belongs to the technical field of nanomaterials, the method comprises the following steps: modifying the surfaces of gold nanoparticles by using sulfydryl polystyrene and 1, 8-octyldithiol to obtain double-ligand co-modified gold nanoparticles; an interface assembly strategy is adopted to enable the double-ligand co-modified gold nanoparticles to form a film at the interface of toluene and diethylene glycol, and after toluene volatilizes, the large-area gold nano single-layer superlattice film with the adjustable distance is obtained. According to the method disclosed by the invention, by accurately regulating and controlling double-ligand modification on the surfaces of the gold nanoparticles and optimizing interaction among the particles in the assembly process, accurate regulation and control of the particle spacing of the gold nanoparticle single-layer superlattice film from 1nm to 8nm are realized. The electromagnetic field intensity can be obviously enhanced by accurately regulating and controlling the particle gaps to the sub-nanometer scale, so that the material becomes an ideal SERS substrate, and possibility is provided for developing a metamaterial with a high optical index.

A preparation method of porous hafnium carbide superhigh-temperature ceramic is characterized by comprising the following steps: dispersing graphene oxide in a solvent to form a graphene oxide dispersion liquid, mixing a monomer hafnium source solution with the graphene oxide dispersion liquid, and carrying out hydrothermal treatment on a hafnium oxide carbon precursor network structure to obtain the porous hafnium carbide superhigh-temperature ceramic. The organic-inorganic hybrid precursor is subjected to two-stage heat treatment, the first stage is inorganic treatment, the second stage is carbon thermal reduction reaction, and the porous hafnium carbide ultrahigh-temperature ceramic material is obtained. Graphene oxide is used as a structure-directing agent and an in-situ carbon source, a monomer hafnium source is uniformly anchored on the surface of a GO sheet layer on the molecular scale, an organic-inorganic hybrid precursor is formed, after the precursor is subjected to hydrothermal crosslinking, Hf species and a carbon skeleton are highly mixed on the nanoscale, and the Hf / GO composite material is obtained. And the subsequent carbon thermal reduction reaction can be efficiently completed in a low-temperature interval of 1300-1450 DEG C.

Method for investigating at least one nano-scale biological sample (1), said method comprising a step a) (100) of preparing an embedding liquid (3) containing a plurality of nano-scale biological samples (1) wherein the nano-scale biological samples (1) have a maximum diameter MD wherein MD < = 30 nm, a step b) (200) of preparing a film (2) of the embedding liquid (3) on an electrically conductive substrate (4) in an application zone (22), the substrate (4) is wetted by the embedding liquid (3) in the application zone (22), and wherein the film (2) of the embedding liquid (3) has an average thickness AT, where AT < = 30 nm; step c) (300) adjusting the film (2) on the substrate (4) to a measurement temperature MT, wherein-100 DEG C < = MT < =-1 DEG C; step d) (400) measures at least one of the nanoscale biological samples (1) within the film (2) on the substrate (4) in an electron beam device (32) at a measurement temperature MT, where the at least one nanoscale biological sample (1) is exposed to an electron beam (41, 44). The present invention provides a method for studying nanoscale biological samples, wherein single nanoscale biological samples can be studied in a simple manner at high spatial resolution.

The invention provides a waterproof design method and a long-term performance maintaining method for a reinforced concrete structure. Reinforcing steel bars are arranged in concrete, and the top face of the concrete is covered with a waterproof layer. The method comprises the following steps: determining an essential mechanism of waterproof layer cracking caused by concrete cracking from a microscopic scale; based on the essential mechanism, the width value of the concrete top surface crack is applied to the bottom surface of the waterproof layer as forced displacement in the opposite direction; iteratively calculating the cracking height of the waterproof layer; it is ensured that the remaining uncracked solid thickness of the waterproof layer is still larger than the minimum solid thickness meeting the waterproof requirement under the condition that concrete cracking is not considered. And at the moment of initial cracking of the concrete, the longitudinal tensile thickness of the waterproof layer has obvious influence on the final cracking height of the waterproof layer, but the calculation result of the cracking height tends to be stable when the thickness is close to the nanoscale. According to the invention, the long-life design of the waterproof layer is facilitated, and the method is applicable to bridges, roads, tunnels, buildings and hydraulic structures.

The invention discloses a synthesis method and application of rare earth silicate nano composite powder for an environmental barrier coating, and aims to solve the problems of silicon volatilization and poor thermal stability in the thermal spraying process of the rare earth silicate environmental barrier coating. The synthesis method comprises the following steps: 1, preparing asymmetric mesoporous silica based on a nano silicon source; 2, co-precipitating the asymmetric mesoporous nano silicon dioxide serving as a nucleation center and rare earth ions, and calcining to prepare high-activity nano precursor powder; and 3, uniformly mixing the nano precursor with potassium sulfate and sodium sulfate, and calcining to obtain the rare earth silicate nano powder. The asymmetric mesoporous silica is selected as a silicon source, a silicon-rich end is supplemented from the nanoscale, silicon loss caused in the spraying process is made up, meanwhile, the rare earth silicate nano-powder is prepared by combining a chemical coprecipitation method with a molten salt method, the effect of optimizing the purity of the nano-powder is achieved, preparation of a high-quality environmental barrier coating material is achieved, and the application prospect is wide. And the thermal stability of the environmental barrier coating is improved.

The invention belongs to the field of quantum sensors, and discloses a diamond spin quantum sensor and a preparation method thereof. The preparation method comprises the following steps: cleaning and polishing a monocrystal diamond substrate; a microwave plasma chemical vapor deposition method is adopted for preparing a diamond film with the nitrogen-vacancy color center density larger than 10 < 16 > cm <-3 > on the single crystal diamond substrate; and preparing an anti-ferromagnetic NiO film on the diamond film by adopting a radio frequency magnetron sputtering method to obtain the diamond spin quantum sensor. The diamond spin quantum sensor disclosed by the invention contains a high-concentration nitrogen-vacancy color center diamond film, and nitrogen-vacancy color center measurement has extremely high spatial resolution, so that the change of a nano-scale magnetic field can be detected; the diamond spin quantum sensor is applied to precise measurement of the magnetic moment of an antiferromagnetic film and the magnetic coupling effect of an antiferromagnetic / ferromagnetic heterojunction interface. And the preparation method is simple, economical and applicable, and provides possibility for application of the diamond nitrogen-vacancy color center material in the field of quantum magnetic sensors.

The invention discloses platinum nanoparticles doped with non-noble metals, a preparation method and application thereof, and aims to realize large-scale production and application of platinum-based nanoparticles with high efficiency, low cost and high catalytic activity. In the early-stage preparation process, it is ensured that inert bubbles of the nanoscale are always filled with reaction liquid. According to the invention, sodium bicarbonate is used as a gas generating agent or other ceramic and thin film structures with micro-nano apertures are used as a micro-nano bubble generator, inert gas is subjected to nano bubbling, and nano-scale bubbles generated by circulation not only can enable reactants to be in uniform contact, but also provide a template effect in a nano-particle forming stage; the active surface area of the catalyst is obviously increased. According to the method, the size of the platinum nanoparticles doped with the non-noble metal can be accurately adjusted by strictly controlling the size of the nano bubbles and the reaction conditions. The process provides an important means for optimizing the performance of the catalyst and powerfully supports the macro preparation of the low-cost and high-efficiency catalyst.

The invention provides a nanoscale metal tip intelligent detector and a use and analysis method thereof. The device integrates a high-precision imaging and positioning module, an intelligent analysis module, an intelligent control interaction module and an automatic execution mechanism. The imaging and positioning module is composed of an optical microscope, a high-resolution CCD camera and a three-axis precision objective table and supports nanoscale morphology feature capture and micron-scale positioning precision. The intelligent analysis module can automatically extract the curvature radius, the taper angle, the surface roughness and other key parameters. The control interaction module is coupled with the automatic execution mechanism, so that automatic control of the detection process and remote storage and optimization of process data can be realized. The device can automatically complete the detection and intelligent analysis of the morphology of the nanoscale metal tip, is compatible with application scenes such as single nanopore / pore channel preparation, scanning probe tip morphology characterization and nano device detection, and remarkably improves the operation efficiency while maintaining high-precision detection.

The invention relates to a preparation method of an ultra-dispersion nano titanium carbide particle reinforced titanium-based composite material, which comprises the following steps: carrying out die forming on mixed powder of sub-ten nano-scale graphene and a titanium matrix, carrying out vacuum microwave sintering, and carrying out extrusion thermal deformation treatment to obtain the ultra-dispersion nano titanium carbide particle reinforced titanium-based composite material. The microstructure reveals that the nano-scale titanium carbide particles generated by the in-situ reaction are uniformly distributed in the matrix crystal. The prepared ultra-dispersed nano titanium carbide reinforced titanium-based composite material shows excellent mechanical properties and has excellent strength and plasticity, the tensile strength at the room temperature can reach 1030-1150 MPa, and the performance is obviously improved compared with pure titanium.

The invention discloses a preparation method of atomic layer deposition synergistic doping modified sodium vanadate, which uses water as solvent, anhydrous sodium iodide and monohydrated vanadium oxyphosphate as sodium source, vanadium source and phosphorus source, and introduces cobalt acetate tetrahydrate and nickel acetate tetrahydrate, and realizes one-step hydrothermal synthesis of HNaV6O assembled by nanosheets and co-embedded with cobalt ions, nickel ions and phosphate ions by synergistically controlling their concentration and ratio, reaction temperature, reaction time and other parameters. 16 ·4H2O nanoflower structure. This method has a simple reaction process, low temperature, easy control, and does not require large equipment and harsh reaction conditions. On this basis, the atomic layer deposition technology was used to successfully realize the cobalt ion, nickel ion and phosphate ion co-embedded HNaV6O with ultra-thin nanoscale metal oxides. 16 Uniform coating of 4H2O positive electrode material. The present invention provides the application of the material in the positive electrode material of sodium ion battery.

The invention provides an innovative measurement characterization method which integrates X-ray computed tomography (X-CT) and low-field nuclear magnetic resonance (NMR) technologies and aims at comprehensively and accurately analyzing the pore structure of the cement paste. According to the method, nano-crystalline cellulose (CNF) is introduced into a cement-based material in multiple dispersion modes, after standard curing is conducted for 7 days, nondestructive testing is conducted through the X-CT technology, two-dimensional and three-dimensional distribution of pores is qualitatively shown, meanwhile, key parameters of micron-sized pores are accurately measured, and a support is provided for macroscopic understanding of the pore structure. Furthermore, in combination with a low-field nuclear magnetic resonance technology, quantitative evaluation of a nanoscale pore structure is realized, volume information and pore size distribution characteristics of nanoscale pores are accurately acquired, the defect of X-CT in nanoscale detection is overcome, and accurate testing in a full-pore-size range from a gel pore to a non-capillary pore is realized. The combination method not only covers comprehensive analysis from microcosmic scale to macroscopic scale, but also realizes accurate visualization, and provides a new view angle and methodology for scientific research of the pore structure of the cement-based material. The method is expected to promote the development of the field of cement-based material pore structures, and provides powerful technical support and a new research direction for deep research in the field.

The invention provides a method and a device for in-situ determination of quartz oxygen isotope in shale, and relates to the technical field of geological prospecting, the method comprises the following steps: crushing or cutting a shale core sample to obtain a core square block, embedding the core square block into a metal target, and pre-treating to obtain a shale sample; scanning and photographing the surface of the shale sample according to a preset mode, splicing a reflected light panoramic image, judging quartz attribute characteristics and cause types of a test target through observation, and delineating the position of the test target; positioning the position of a test target according to the morphology characteristics of the test target and different surrounding reference objects in combination with the reflected light panoramic image, and performing in-situ oxygen isotope test on the test target by using a nanoscale secondary ion probe mass spectrometer to obtain in-situ oxygen isotope test data; and checking each in-situ oxygen isotope measuring point pit position of the shale sample, performing quality control on in-situ oxygen isotope test data according to a checking result, and determining an in-situ oxygen isotope measuring result.

The invention relates to the technical field of scanning tunneling microscopes, and discloses a scanning probe measuring device and a control method for pinpoint-to-pinpoint imaging, two pinpoints are oppositely arranged, and the pinpoints are accurately controlled and movably positioned based on a basic working mode of a scanning probe microscope. A needle tip-tunnel junction-needle tip working structure is established, after bias voltage is applied externally, electron tunneling between needle tips only relates to a small number of atoms or single atoms at the tail ends of the needle tips, the tunneling effect that the small number of atoms contribute to electrons is achieved, and therefore small number or single atom imaging is achieved. The device can be rapidly transplanted to application scenes of low temperature, strong magnetic field, optical measurement and the like, the double-needle-point structure is regulated and controlled through piezoelectric displacement or an electric field, tunnel junction width and barrier height can be optimized in real time, and research on dynamic construction and dynamic electrical characteristics of nanoscale tunnel junctions is greatly facilitated.

The invention relates to a multilayer electroactive reflective module (1), and to a method for manufacturing same, the reflective module (1) comprising a substrate (10), a multilayer stack (18) arranged on the substrate (10) and configured to reflect a reflected light beam (2') having a specific wavelength dependent on a difference in potential applied to the stack (18), wherein a first electrode (12) and a second electrode (13) are configured to apply the difference in potential, the multilayer stack (18) comprising a metal mirror (14), a layer based on a conductive polymer (15) configured to reflect a wavelength via the Fabry-Perot effect, the layer having a nanometer-scale thickness (d15) that varies according to the difference in potential applied to the stack (18), a layer forming a counter electrode (17), and a layer based on a solid polymer electrolyte (16) arranged between the layer based on the conductive polymer (15) and the counter electrode (17).

The invention discloses a method for analyzing an existence form of an As element in pyrite based on multi-method combination. The method comprises the following steps: S1, selecting pyrite particles containing multi-stage annular bands as a to-be-detected object; s2, carrying out electron probe analysis, and delineating a further analysis area; s3, the substitution property of As to Fe or S is judged, and the existence form of the As element is preliminarily judged; s4, performing focused ion beam processing and spherical aberration transmission electron microscope analysis, and shooting HAADF and ABF images; and S5, analyzing the spherical aberration transmission electron microscope image by using DigilMicrograph data processing software, and analyzing the intensity difference of Z-contrast microscopic images of different atomic sites and the atomic space occupation abnormal conditions of heavy elements and light elements in the ABF image. Based on the combination of the electron probe and the spherical aberration transmission electron microscope, the existence form of the As element in the pyrite is finely analyzed from the micron scale to the nanometer scale, the credibility is high, and the substantive evidence is sufficient.

The invention relates to the field of oil and gas reservoir exploration and development, and discloses a shale oil reservoir carbon dioxide injection exploitation effect prediction method and device, and the method comprises the steps: obtaining the characteristic parameters of a target core and the engineering parameters of a target block; constructing molecular dynamics models corresponding to different minerals in the target rock core according to the characteristic parameters and the engineering parameters; determining a target relational expression according to a simulation result of each molecular dynamics model; based on a target pore network model and the target relational expression, the exploitation effect of carbon dioxide injection of the shale oil reservoir is determined, and the target pore network model is obtained based on the characteristic parameters. Due to the fact that the flow rule of fluid in the nanoscale pores, nanoscale effect changes and differences among different mineral types are considered when the exploitation effect of the shale oil reservoir injected with the carbon dioxide is predicted, the accuracy of prediction of the exploitation effect of the shale oil reservoir injected with the carbon dioxide can be improved.

The invention discloses a preparation method of a magnesium alloy surface composite film, and belongs to the technical field of magnesium alloy surface treatment. According to the preparation method, a pretreated magnesium alloy substrate is firstly soaked in an alkaline solution, then the magnesium alloy substrate is sequentially placed in a first hydrothermal growth solution and a second hydrothermal growth solution to be subjected to a hydrothermal reaction, and in the first hydrothermal reaction, a zinc site, namely a nucleation point for in-situ growth of a zinc oxide nanorod, can be formed while an LDHs sheet is formed; in the second hydrothermal reaction, a zinc site formed in the first hydrothermal reaction is used as a nucleation point for in-situ growth of the zinc oxide nanorod, so that the growth of the zinc oxide nanorod array perpendicular to the LDHs sheet can be effectively regulated and controlled, a better sealing effect on the LDHs irregular micro-gap is realized, the LDHs membrane gap is shrunk to several nanometers, and the LDHs membrane has good sealing performance. Furthermore, the difference between the gap sizes is reduced, and the corrosion resistance of the surface composite film is improved. In addition, the preparation method provided by the invention is simple to operate and beneficial to actual production.

Systems and methods for transferring heat from a heat source using a dual-channel flow boiling structure having a first fluid flow channel configured to receive a flow of a first fluid in a first direction, a second fluid flow channel configured to receive a flow of a second fluid in a second direction, parallel or counterflow to the first direction, and a separator condenser separating the first fluid flow channel and the second fluid flow channel. Opposing sides of the separator condenser define a flow surface of the first fluid flow channel and a flow surface of the second fluid flow channel. One or both opposing sides of the separator condenser has a functionalized surface that includes micro-scale and nano-scale features formed by femtosecond laser surface processing (FLSP) or any other functionalization technique, and / or a surface of the first fluid flow channel other than the flow surface defined by the separator condenser is a functionalized surface that includes micro-scale and nano-scale features.

The invention relates to a nanoindentation and reliability characterization technology thereof, in particular to a heterogeneous material welding reliability characterization method applied to a brush type sealing structure. By means of the nanoindentation technology, mechanical properties such as hardness, elasticity modulus and plastic deformation of the welded joint are obtained by analyzing indenter deformation and indentation morphology. Meanwhile, indentation testing is carried out on different positions of the brush type sealing welding joint, and the performance comparison condition of all areas of the welding joint is obtained. Compared with a traditional reliability characterization means, the device and the method have the advantages that various areas of the heterogeneous welding joint including a base material, a heat affected zone and a fusion zone are tested under the nanoscale, various material performance indexes such as hardness, elasticity modulus and plastic deformation are measured at the same time, and the device and the method have high-precision and multifunctional testing capacity and are suitable for popularization and application. And moreover, the joint cannot be damaged or other properties cannot be influenced, and compared with a room-temperature stretching result, the nanoindentation technology has relatively high reliability and repeatability, and an accurate characterization result is obtained.

The invention provides a method for analyzing and determining an aggregation structure in a condensed state, which comprises the following steps: step 1, measuring a same condensed state substance sample by adopting at least two structure determination means with different principles, at least another kind of structure measurement means is used for obtaining nanoscale or mesoscale aggregation structure information so as to obtain multi-source structure measurement data representing different structure hierarchies. According to the method, multi-scale structure measurement data is obtained by adopting at least two structure measurement means with different principles for the same condensed substance sample, and structure information of different scales is subjected to combined treatment in the same analysis process; and the structural characteristics of the aggregation structure on the atomic scale, the nanoscale and the mesoscale can be simultaneously included in an analysis range, so that the characterization integrity of the overall characteristics of the aggregation structure in the condensed state is improved.

The invention discloses a manufacturing method of a double-sided micro-nano structure, which can realize high absorptivity of a visible light wave band in a space environment based on the double-sided micro-nano structure, so that some structural components of a satellite are enabled, and the manufacturing efficiency of ultra-black structural components of the satellite is greatly improved. The double-sided micro-nano structure is formed by combining three functional structure modules and comprises a nano-scale anti-reflection structure, a substrate and a micron-scale light trapping structure. The nanoscale anti-reflection structure is a dot-matrix type nanocone structure, and the interface reflectivity can be greatly reduced. The micron-scale light trapping structure is of a dot-matrix pyramid structure, and absorption of light entering the double-face micro-nano structure is increased through multiple times of reflection. The substrate provides an attachment space for the nano anti-reflection structure and the micron light trapping structure, and provides the mechanical strength of the whole double-sided micro-nano structure. And the double-sided micro-nano structure is integrally manufactured and formed based on an imprinting process.

The application relates to a light-degradation-driven high-molecular nanomotor and a preparation method, and aims to solve the environmental pollution and biological safety problems caused by the degradation difficulty or long cycle of the nanomotor power assembly. The nanomotor has an asymmetric nanostructure and is assembled by a light-degradation high-molecular assembly and a biocompatible high-molecular effective load in a nanometer scale. The preparation method comprises the following steps: 1. uniformly mixing a light-degradation high-molecule and a biocompatible high-molecule in an organic solvent to prepare a mixture A; 2. mixing the mixture A and water at a high speed to prepare a mixture B; and 3. removing the organic solvent to prepare the nanomotor. Under light, the light-degradation assembly absorbs light energy to degrade and generate bubbles, which push the nanomotor to move in the solution. The start / stop of the nanomotor is controlled by the on / off of the light source, and the fast / slow movement of the nanomotor is controlled by the strong / weak of the light source. The structure of the light-degradation assembly is gradually degraded and finally completely destructed with the reaction, so that the biological safety and environmental pollution problems of the nanomaterial are relieved.

The invention relates to a preparation method of an epitaxial structure with micron holes and the epitaxial structure, and belongs to the technical field of epitaxial wafer manufacturing. Comprising the following steps: sequentially growing an AlN buffer layer, a Si-doped 3D AlN layer containing a nano-scale air gap, a high-temperature AlN layer, an n-type AlGaN layer, a multi-quantum well active layer, an electron barrier layer, a p-type AlGaN layer and a p-type GaN contact layer on the surface of a substrate; etching a region corresponding to the n electrode in the epitaxial structure until the air gap is exposed; growing a SiO2 protective layer; enlarging a nano-scale air gap to a micron-scale air gap through electrochemical etching; and preparing a p electrode metal layer on the p-type GaN contact layer, and preparing an n electrode metal layer on the micron-level air gap of the Si-doped 3D AlN layer to obtain an epitaxial structure with micron holes. According to the invention, the nanoscale fusiform air gap is expanded to the micron scale by using the dry etching process and the electrochemical etching process, so that the light extraction efficiency is improved.

The invention discloses a metal organic framework nano sandwich composite material as well as a preparation method and application thereof. The metal organic framework nano sandwich composite material comprises a two-dimensional sheet material and a nano core material, wherein the two-dimensional sheet material is accurately assembled on the outer surface of the nano core material on the nanoscale; the nanometer core material is accurately assembled between the two pieces of two-dimensional sheet-shaped materials, and the two pieces of two-dimensional sheet-shaped materials are accurately assembled on the outer surface of the nanometer core material on the nanometer scale to form a nanometer sandwich structure. The two-dimensional sheet material and the metal organic framework particles form a sandwich structure, so that the stability of the metal organic framework is improved, a new direction is provided for improving the stability of the metal organic framework, and the method has very positive influence on industrial application of the metal organic framework in the fields of separation, catalysis, energy storage, sensing and the like.

The present invention relates to the field of optical nano-imaging bioassays and discloses a bioassay and optical imaging method based on a one-dimensional nanophotonic platform. The method comprises the following steps: (1) a beam of white light is irradiated along a non-periodic direction on a one-dimensional nanostructure, and the generated scattering and diffraction signals are received using a microscope or mobile phone; (2) defects in the one-dimensional nanostructure disrupt the distribution of the local field, reduce the scattering intensity of the nanostructure, and change the color of the one-dimensional nanostructure; (3) in the visible light region, in addition to a scattering peak, another new diffraction peak can improve the sensitivity of the spectral response, allowing the measurement of size differences of 20 nanometers; (4) by modifying antibodies on the surface of the one-dimensional nanostructure, the detection of a single virus can be achieved, which is beneficial for the early diagnosis of in vitro diseases, especially in underdeveloped areas and areas with harsh biological experimental conditions. The technology is simple to operate, low-cost, and conducive to the rapid and high-throughput detection of nanoscale samples.

The application discloses a high-compression-strength high-plasticity iron-based alloy and a preparation method and application thereof, and relates to the technical field of high-performance metal structural materials.The application provides an element composition of the high-compression-strength high-plasticity iron-based alloy; the microstructure of the alloy comprises a Fe2Nb Laves phase network structure distributed along grain boundaries and an intracrystalline nanometer-scale composition modulation structure; the room-temperature compression yield strength of the high-compression-strength high-plasticity iron-based alloy is not less than 2000 MPa, and the compression fracture strain is not less than 30%. The application further provides a preparation method and application of the alloy. The application forms a multi-level micro-nano strengthening structure in-situ in an alloy block through a specific non-equilibrium solidification process, so that the alloy simultaneously has ultrahigh strength and high plasticity under compression load, and can be applied to high-pressure-resistant structural parts, and effectively solves problems of a complicated preparation process of traditional high-strength materials, high strength necessarily accompanied by low plasticity and the like.

The invention discloses a method for controlling directional transportation of liquid drops in a two-dimensional nano channel. Establishing a two-dimensional nano channel and a nano probe, and constructing a droplet model; the mass center of the nano liquid drop is restrained, atoms on the two sides of the x-axis edge of the graphene sheet are fixed, and the nano channel is kept in a fixed state; the simulation system is optimized, system energy is reduced, and the initial configuration of the simulation system tends to be stable; in a molecular dynamics simulation process, setting boundary conditions of three dimensions as periodic boundary conditions; calculating the time integral of the Newton motion equation; controlling the temperature of the system, keeping the temperature, and enabling the relaxation of the system to reach a steady state; the nanoprobe is pressed down, so that the graphene sheet on the upper layer of the two-dimensional nanochannel is deformed, and the non-parallel two-dimensional nanochannel is constructed; the limitation on the mass center of the nano liquid drop is relieved, and the movement behavior of the nano liquid drop is observed; according to the method, the movement behavior of the liquid drop at the nanoscale can be analyzed from the aspects of atoms and molecules.