156 results about "Nanoscopic scale" patented technology

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.

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 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 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 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 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 present application relates to the technical field of silver-coated copper powder, in particular to a silver-coated copper powder particle with uniform plating thickness and a preparation method thereof. The method comprises raw material pretreatment, plating solution preparation, plating, electroplating solution preparation, electroplating and post-treatment. First, the non-selective deposition characteristics of chemical plating are used to build a complete and non-porous thin silver layer on the surface of the copper powder, ensuring 100% conductive coverage. Then, the uniform conductive layer is used as a substrate to precisely thicken through a highly controllable electroplating process. The synergistic effect of electric field and fluid dynamics is used to achieve high uniformity and structural densification of the silver layer in the nanometer scale. Through the precise relay of "chemical plating bottoming" and "electroplating thickening", the inherent contradictions of traditional single methods in coverage, uniformity and plating quality are cooperatively overcome.

This invention belongs to the field of advanced manufacturing technology and relates to an electro-spraying method for inducing jets with pre-printed functional layers. Based on electrohydrodynamic effects, a jet is ejected to pre-print complex micro / nano functional structure patterns on a substrate. Then, under the action of an electric field, the jet size and deposition position are induced. Dual nozzles work together to rapidly achieve the same shape as the pre-printed functional layer. The pre-printed functional layer fully adheres to and solidifies with subsequent nanoscale continuous jets, forming a composite micro / nano functional structure. This electro-spraying method uses a pre-printed functional layer to change the distribution of the electric field on the substrate, ensuring the accuracy of the jet deposition position and reducing dimensional errors in the composite micro / nano functional structure process. It has advantages such as low equipment cost, simple process, and short processing cycle, optimizing the micro / nano functional structure and improving the performance and lifespan of nanodevices.

The invention relates to a preparation method of a highly ordered, soft and malleable MXene-based organic-inorganic hybrid superlattice material, which comprises the following steps: carrying out surface modification on hydrochloric acid acidified Ti3C2Tx nanosheet aqueous dispersion by using oleylamine, washing the product with ethanol, drying, and dispersing in trichloromethane; and adding small molecular ligands such as oleic acid into the dispersion liquid, and then carrying out solvent evaporation assembly to obtain the superlattice material with a long-range ordered layered structure. The film shows intrinsic flexibility and can be directly formed into a macroscopic three-dimensional block through physical folding and mold pressing. The mechanical property of the MXene material is fundamentally regulated and controlled through molecular intercalation and ordered assembly, integrated construction from a nanoscale ordered structure to a macroscopic functional material is achieved, and the obtained MXene-based organic-inorganic hybrid superlattice material has electrical conductivity, structural orderliness and good deformability; the method has important application prospects in the fields of flexible electronic devices, deformable electrodes, intelligent sensing and the like.

The application discloses a method for analyzing the existence form of As elements in pyrite based on a combination of multiple methods, which comprises the following steps: S1, selecting pyrite particles containing multiple ring zones as the object to be detected; S2, performing electron probe analysis to circumscribe the further analysis area; S3, judging the substitution property of As to Fe or S to preliminarily determine the existence form of As elements; S4, performing focused ion beam processing and spherical aberration transmission electron microscope analysis to shoot HAADF and ABF images; and S5, analyzing the spherical aberration transmission electron microscope images by using DigitalMicrograph data processing software to analyze the intensity difference of Z contrast microscopic images of different atomic sites and the abnormal atomic space occupation of heavy elements and light elements in the ABF images. The application is based on the combination of electron probe and spherical aberration transmission electron microscope, can finely analyze the existence form of As elements in pyrite from the micron to nanometer scale, and has high reliability and sufficient substantial evidence.

1. The name of the design product: hot field emission scanning electron microscope (8200). 2. The use of the design product: precision scientific instrument for high-resolution topography observation and microstructure analysis of sample surface at nanometer scale. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The application discloses a method and device for testing interfacial water in a Z direction with nanometer scale step by Raman spectrum, and the method comprises the following steps: providing a bottom plate and an upper substrate on the top surface of the bottom plate, modifying the top surface of the bottom plate and the bottom surface of the upper substrate according to the interfacial type of the interfacial water to be tested; the left edge surface of the top surface of the bottom plate is attached to the left edge surface of the bottom surface of the corresponding upper substrate, and a partition is arranged between the top surface of the bottom plate and the bottom surface of the corresponding upper substrate; the partition forms a gap with increasing height between the top surface of the bottom plate and the bottom surface of the upper substrate; the water solution to be tested is added in the gap, the step length of the horizontal movement of the laser Raman is set, the Raman spectrum at different distances in the Z direction is obtained by detection, and the interfacial water condition at different distances in the Z direction is obtained by analysis. The method successfully analyzes the change of the interfacial water structure at different distances in the Z direction with nanometer scale for the first time.

The invention discloses a near-field terahertz nonlinear optical effect excitation detection method and system. A femtosecond laser space-time shaping technology is combined, a strong terahertz pulse is generated based on a femtosecond laser filament, the strong terahertz pulse is coupled with a tapping mode atomic force microscope, and space-time matching of probe vibration and the terahertz pulse is accurately controlled by using a synchronous sampling method, so that the time-space matching of the probe vibration and the terahertz pulse is realized. Mismatch between the low-repetition-frequency strong-field terahertz pulse and the vibration frequency of the near-field microscope probe is overcome, and strong-field terahertz near-field coupling and detection are achieved. The local field enhancement effect of the tip of the nanoprobe can realize nanoscale focusing (peak field intensity reaches MV / cm magnitude) of a terahertz field at a probe-sample gap, the near-field nonlinear interaction is remarkably enhanced, the diffraction limit is broken through, and the nanoscale spatial resolution is realized. According to the method, the excitation detection efficiency and the spatial resolution of the terahertz nonlinear effect are remarkably improved, and accurate excitation, characterization and regulation of the nonlinear optical effect of the sample can be realized.

The invention discloses a method for quantitatively detecting uranyl ions by adopting a silicon-based carbon dot material and application of the method, and belongs to the field of nano composite materials and radionuclide detection. Mixing the silicon-based carbon dot composite material with an acid solution containing uranyl ions, carrying out ultrasonic treatment, detecting the fluorescence intensity of the mixed solution by adopting a fluorescence spectrum, and quantitatively analyzing the uranyl ion concentration according to the uranyl ion concentration and a fluorescence intensity curve. The silicon-based carbon dot composite material is a silicon-based carbon dot material of which the surface is modified by functional groups; the functional groups comprise hydroxyl, carboxyl and amino. The method can generate stable fluorescence response change when acting with uranyl ions, accurate quantitative analysis of uranyl ion concentration can be realized, the silicon-based carbon dot composite material has high uranyl ion detection response speed by means of the synergistic effect of the nanoscale effect and the surface functional group, and detection can be completed in a short time.

The invention discloses a reversible dynamic aperture solid nanopore array based on a temperature-sensitive phase change layer and a preparation method and application of the reversible dynamic aperture solid nanopore array, and belongs to the technical field of single molecule detection and nanostructure regulation, the array introduces the temperature-sensitive phase change layer into the inner wall of a solid nanopore, and when the local temperature crosses the phase transition point of the temperature-sensitive phase change layer, reversible volume change is generated; therefore, the effective aperture of the nanopore is continuously adjustable in a sub-nanometer scale range. An independent micro heating unit and an independent temperature sensing unit are integrated below each nanopore in the array, and single-pore-level accurate temperature control adjustment is achieved in a row-column addressing mode. In combination with ionic current monitoring and an external control module, the aperture can be set in real time according to the size requirements of different target molecules, and dynamic aperture regulation and control with a programmable structure, quick response and good repeatability are realized. The array structure provided by the invention is suitable for single molecule level detection of objects such as multiple types of small molecule pollutants, tumor-related biomarkers, biomacromolecules and the like, and has the advantages of high sensitivity, high flux and wide applicability.

The device is capable of monitoring and controlling the layer-by-layer buildup at the molecular level using an etched FBG. Etched FBG enhances the sensitivity of a traditional FBG by increasing the light interaction with the deposited layers. This enables sub-nanometer thickness monitoring during the buildup process, allowing the detailed study of adsorption and desorption processes. the proposed mechanism can be used as an instrument for probing inter-diffusive behaviour of macromolecules, bio-polymers and proteins at sub- nanometer scale.

A nanoscale temperature detector including a diamond sensing probe with a transverse dimension of at least 200 nanometres and a sensing tip-having a curvature radius of less than 100 nanometres, less than 10 nanometres or less than 1 nanometre, and a plurality of colour centres, whose emission count rate show temperature-sensitive features. The diamond sensing probe has a transverse dimension of at least 200 nanometres and is connected to a to a detector system by means of a mounting structure. A thermal isolation barrier thermally decouples the sensing probe from the detector system.

The invention provides an indium-lead composite oxide nanowire and a preparation method and application thereof, the atomic ratio of In to Pb in the nanowire is 0.1-10, and the diameter of the nanowire is 10-300 nm. In the invention, the two metal components indium and lead generate a synergistic component effect and are applied to the electrochemical reduction process, so that the adsorption and activation of the raw materials are greatly enhanced. Different valence states of lead and indium are mutually adjusted, and the electronic structure of the catalyst is optimized. Meanwhile, more active sites can be exposed by the nanowire structure, and the reaction kinetics process is effectively improved by the three-dimensionally arranged nanoscale structure.

The invention discloses a method for preparing a composite nitriding coating on the surface of titanium alloy, and belongs to the technical field of surface engineering and coatings. The coating at least comprises a nitride strengthening layer and a hard coating in sequence from inside to outside. The hard coating comprises a composite coating, the composite coating comprises a nano multilayer structure formed by alternately depositing A layers and B layers on the surface of the nitride strengthened layer, the A layers are TiAlN layers, the B layers are TiSiC-N layers, and the TiSiC-N layers have nano-scale (Ti, Si) (C, N) composite phases. According to the method, one or more hard coatings are deposited on the surface of the nitride layer through the composite process of double-glow combined active screen plasma nitriding and post-treatment hard coating deposition, and the problems that a single nitriding layer is insufficient in hardness, limited in wear resistance and the like are successfully solved. And two procedures are continuously finished in the same vacuum cavity, so that the interlayer bonding strength is ensured, and the production efficiency is improved.

The application discloses 3D printing aramid wave-absorbing honeycomb material and a preparation method and application thereof, utilizes wave-absorbing agents with nano-scale structure and excellent electrical properties and aramid nanofibers with excellent mechanical properties to be tightly combined through hydrogen bonds, and advantages that the surface of the wave-absorbing agents and the aramid nanofibers is easy to produce a strong network cross-linking structure, and the mechanical properties of the 3D printing aramid wave-absorbing honeycomb material are improved, a new aramid nanofiber-based material with good wave-absorbing performance and mechanical properties is developed, and the defects of the current wave-absorbing honeycomb material, such as a large weight of a surface coating and easy peeling, are solved, and the application demand in the fields of aerospace, radar stealth technology and the like can be met. The 3D printing technology is used to print aramid wave-absorbing honeycomb materials with different sizes and densities, energy consumption is low, printing precision is high, the process is simple, the 3D printing aramid wave-absorbing honeycomb material has excellent mechanical properties, good wave-absorbing performance, strong structure designability, and a wide application prospect.

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 invention relates to the technical field of shale reservoir mechanical property evaluation, and provides a shale mechanical property determination method and device based on molecular simulation. The method comprises the following steps: constructing a first slit hole model of minerals of a target shale sample, a second slit hole model of kerogen organic matters and a third slit hole model between different minerals and / or kerogen organic matters; adding molecules of different fluids, and constructing a first slit hole model, a second slit hole model and a third slit hole model containing different fluids; and constructing a mechanical property model of the target shale sample according to the mineral combination of the target shale sample, the first crystal orientation, the characteristics of different fluids, and the first slit hole model, the second slit hole model and the third slit hole model containing different fluids. The method solves the problem that an existing method is difficult to accurately quantify the mechanical effect under the microcosmic nanoscale fluid characteristic-mineral component coupling effect.

An atomic force microscope-based nanoscale photothermal ion in-situ characterization device, comprising: an atomic force microscope module comprising an AFM conductive probe in contact with a to-be-measured region of a to-be-measured sample; a nanometer infrared photothermal excitation module for emitting pulsed mid-infrared laser to the to-be-measured region to cause the micro-cantilever of the AFM conductive probe to deform; a photothermal ion signal detection module comprising a signal detection unit and a data processing and display unit in communication, the signal detection unit being used to acquire the micro-cantilever signal of the AFM conductive probe; wherein the data processing and display unit acquires the photothermal ion second-harmonic signal of the to-be-measured region based on the micro-cantilever signal of the AFM conductive probe to display the image of the ion transport micro-region surface distribution of the to-be-measured region.

The application discloses a universal preparation method of morphology-controllable ordered alloy nanocrystals based on a non-equilibrium nanometallurgical strategy, which comprises the following steps: placing alloy nanocrystals or loaded alloy nanocrystals in a non-equilibrium nanometallurgical platform, heating to a holding temperature at a heating rate higher than a critical heating rate of the alloy, cooling to room temperature after isothermal holding, and obtaining morphology-controllable ordered alloy nanocrystals. The application characterizes a nanometer-scale TTT phase diagram which is different from a traditional bulk alloy, finds an unreported "atomic-level armor formation region", adjusts the temperature and heating rate of alloy nanocrystal ordering to the corresponding atomic-level armor formation region, successfully prepares morphology-controllable ordered alloy nanocrystals with different particle sizes, different geometric shapes and different chemical components, and solves the preparation problem of morphology loss in the ordering process of alloy nanocrystals at high temperature which has not been solved before. The preparation method is simple and universal, and is suitable for large-scale production.

The present application belongs to the technical field of super-hydrophobic coating, and particularly relates to a high-wear-resistance high-transparency super-hydrophobic nano coating and a preparation method thereof. In order to develop a super-hydrophobic coating material with high wear resistance and high transparency, the present application prepares a surface rough structure required by a super-hydrophobic coating through an organic-inorganic nano hybrid material, and prepares a coating surface with a single nano scale and a conical structure through a V-shaped nano pore template, and then chemically modifies the surface structure through a liquid-like molecule with low surface energy and low friction coefficient. After steps such as preparation of a coating, pretreatment of a template, preparation of a coating structure, and chemical modification of a coating surface, a super-hydrophobic nano coating is prepared. Through synergistic effects of organic-inorganic hybridization, nano conical geometry, and liquid-like surface chemistry, the wear resistance of the coating is effectively improved, and the coating has high transparency and super-hydrophobicity.

A method for measuring an atomic scale microscopic thermal conductivity, said method being based on a focused ion beam-based sample preparation method and scanning transmission electron microscopy-electron energy loss spectroscopy. A temperature gradient is generated by locally heating a sample in a scanning transmission electron microscope; the temperature is measured in the electron microscope by means of electron energy loss spectrums; local heating in a nano-scale region of a sample is realized, and a stable temperature field having a large temperature gradient is constructed; and atomically resolved phonon spectrum detection and temperature measurement are realized in space. Local temperature information and a relative value of a microscopic thermal conductivity can be measured at an atomic scale, so that the quantitative analysis of the microscopic thermal conductivities of structures at different positions inside the sample can be performed; and the present invention has the advantages of accurate measurement, high spatial resolution, capability of studying nano-scale thermal transport and micro-zone thermal conductivity, etc., and is suitable for samples having complex structures and a plurality of material systems.

The microporous noise-reducing aerogel coating material is prepared from the following raw materials in parts by weight: 100 to 110 parts of tetraethoxysilane, 1 to 2.5 parts of hydrophilic emulsifier, 5 to 10 parts of pore-foaming agent, 0.5 to 2 parts of initiator, 30 to 40 parts of functional monomer, 5 to 10 parts of cross-linking agent and 2 to 3 parts of lipophilic emulsifier. According to the invention, a hierarchical pore structure from micron to nanoscale is constructed in situ through a one-step method. In the gelation and drying processes, the interface of the emulsion drops is used as a template to guide and form a macroporous skeleton; meanwhile, through a sol-gel process of a silicon source and volatile / reactive pore forming of an organic phase, mesoporous and microporous structures are formed in pore walls. And finally, a three-dimensional through'macropore-mesopore-micropore 'hierarchical pore structure is formed.

The invention belongs to the technical field of magnetic metal powder preparation, and particularly relates to micron-sized low-loss magnetically soft alloy powder and a preparation method thereof. The powder is composed of enriched Fe (Si) or Fe (Ni) solid solution cell crystals, and non-magnetic second phases such as silicon oxide, nitride or carbide are distributed at the boundaries of the cell crystals in a nanoscale continuous net form, so that an insulating network is naturally formed in the powder. The structure is realized through specific component design in combination with ultra-high-speed gas atomization and a controllable cooling rate technology. In the rapid solidification process, alloy elements (such as Si) and impurity elements (such as O and N) are subjected to microscopic segregation, and a nano insulating phase is generated in situ at the cell crystal boundary. The powder disclosed by the invention does not need an additional surface insulation coating process, and an inherent insulation network in the powder can effectively segment a magnetic domain and block an eddy current path, so that high-frequency eddy current loss and magnetic hysteresis loss are remarkably reduced. The powder is particularly suitable for preparing a high-frequency, low-loss and high-strength integrally-formed soft magnetic composite material magnetic core.