98 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 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 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.

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 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 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 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.

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 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.

The application aims to provide a method for loading zinc atom clusters on the surface of ruthenium nanoparticles by breaking Zn-N bonds based on H2 thermal drive and application, and belongs to the technical field of preparation of nanometer catalytic materials; the method takes a double-limiting material containing coordination limited Zn-N4 and narrow hole limited Ru clusters as a precursor, thereby ensuring uniform dispersion and close proximity of initial active sites; H2 is used as a key inducer, active hydrogen species generated by catalytic cracking of hydrogen by ruthenium sites is used, and hydrogen overflow effect is used to realize the breaking of thermodynamically stable Zn-N bonds; high-mobility Zn atoms are obtained and finally selectively captured on the surface of Ru nanoparticles; Zn species diffuse, nucleate and grow on the surface of Ru crystals to form sub-nanometer scale Zn atom clusters through self-assembly; and the material can improve the intrinsic catalytic activity and stability of Ru-based catalysts and provide a new way for efficient energy conversion.

The invention discloses a STEM-EDS quantitative analysis method for micro-trace elements on a high-temperature alloy interface, and belongs to the technical field of material micro-analysis. The method comprises the following steps: preparing a transmission electron microscope sample of which the thickness of a thin region is less than 100nm; adopting a field emission or spherical aberration correction transmission electron microscope to carry out STEM imaging under 200-300kV; the method comprises the following steps: firstly, counting different feature morphology interfaces and a quantity ratio thereof under 2000 *-3000 *, then respectively selecting a representative interface from each type of interfaces under 200k *-300k * to carry out EDS surface scanning for 20-30 minutes, and starting drift correction during the period; dividing the interface into a weak segregation interface and a strong segregation interface according to an EDS result; dividing data into quadrats, and counting to obtain an average value of element mass percentage contents of the two types of interfaces, 95% confidence level of the average value and a quantity ratio of the average value; and calculating the final content of the target element. According to the method, the problem that the nanoscale spatial resolution and quantitative statistical representativeness cannot be considered in the prior art is solved, and the accuracy and repeatability of an analysis result are remarkably improved.

The application is based on a cement-based material original state pore measurement method based on low-field magnetic resonance longitudinal relaxation technology, which overcomes the technical bottlenecks of traditional magnetic resonance test methods in signal acquisition integrity, rapid relaxation signal capture and longitudinal surface relaxation strength determination by optimizing the acquisition and processing technology of longitudinal relaxation signals, and realizes the accurate detection of the pore structure of cement-based materials from the nanometer scale to the micron scale. Compared with the traditional transverse relaxation method, the method of the application is not disturbed by paramagnetic substances when testing ferrosilicate cement-based materials, and has higher applicability and accuracy. Overall, the application can non-destructively, accurately and accurately characterize the pore distribution characteristics of cement-based materials without drying pretreatment of the sample, providing a scientific basis for optimizing the performance of cement-based materials and improving the level of engineering quality control, and effectively promoting the further development of pore structure test technology in the fields of building engineering and material science.

The invention relates to the technical field of superconducting materials, and discloses a multi-element rare earth barium copper oxide high-temperature superconducting thin film and a preparation method thereof. In order to solve the technical problems that the pinning effect of an artificial magnetic flux pinning center of a high-temperature superconducting material is poor and the critical current density under a high magnetic field is low, the rare earth barium copper oxide is prepared by co-doping at least three rare earth elements at a rare earth site; an artificial magnetic flux pinning center of a perovskite oxide BaZrO3 and a double perovskite oxide Ba2YNbO6 is introduced into the rare earth barium copper oxide, and a multi-scale pinning system from the atomic scale to the nanoscale is formed in the superconducting thin film through atomic scale mismatch and introduction of the artificial magnetic flux pinning center; effective pinning of magnetic flux vortexes of different states and different sizes is achieved, and therefore the critical current density of the high-temperature superconducting material under the low-temperature high magnetic field is effectively improved finally.

The invention relates to the technical field of optics, in particular to a photon nanometer jet flow generator based on a concentric ring structure and a design method, and the photon nanometer jet flow generator comprises a medium substrate and a medium concentric ring structure arranged on the medium substrate; the medium concentric ring structure is formed by circular ring structures with different inner and outer radiuses distributed along a concentric circle. According to the PNJ generator based on the concentric ring structure, the concentric ring structure meeting the requirement can be designed as required for any optimization target. Moreover, the concentric ring structure provided by the invention is compatible with a micro-nano processing technology, is easy to process, has the advantage of on-chip integration, and shows huge application potential in the fields of ultrahigh-resolution optical imaging, nano particle control, ultra-sensitive biosensing, nanoscale photoetching, enhanced spectroscopy and the like.

The application relates to a method for obtaining nanometer-scale lines by using a laser, and belongs to the technical field of semiconductors, which solves the problems of complicated process and extremely high cost in obtaining high-density nanometer-scale optical lines in the prior art. The method comprises the following steps: sequentially forming a dielectric layer and an amorphous silicon layer above a substrate; using a laser to irradiate a mask to perform silicon crystallization on a partial region of the amorphous silicon layer, wherein the crystal boundaries of the polycrystalline silicon formed after the partial region of the amorphous silicon layer is subjected to silicon crystallization are determined by the interval of the regularly-shaped apertures on the mask; performing a planarization treatment on the crystal boundaries of the polycrystalline silicon of the amorphous silicon layer; removing the crystal boundaries to form crystal boundary grooves by using an etching liquid; and obtaining nanometer-scale lines on the substrate by using the crystal boundary grooves. The regularly-shaped crystal boundaries formed by the method of laser crystallization and the damascene process obtain a low-cost nanometer-scale line array.

The application discloses a kind of molecular dynamics simulation methods of gas leakage in metal micro crack, the method is first in supercell iron model pre-set hollow microchannel, obtain the iron model containing micro crack;Energy minimization processing and molecular dynamics simulation are carried out based on periodic gas model, obtain the gas model after relaxation;Vacuum layer, iron model containing micro crack, relaxation gas model, isolation layer splicing are established by micro crack gas leakage interface model, then molecular dynamics simulation is carried out to interface model, according to the leakage rate of gas in micro crack is calculated according to simulation trajectory result.This application method has the advantages of high calculation efficiency, low simulation cost, can construct the complete micro crack gas leakage interface model of nanometer scale, from microcosmic angle of view analyzes the leakage rule and mechanism of gas molecule in micro crack, obtains the internal relation of micro crack size, structure and gas leakage evolution, lays the foundation for the sealing performance, life and reliability of precision instrument promotion.

The application discloses a kind of magnetically induced orientation titanium carbide ferrite composite film and its preparation method and application.The application solves the single mode of electromagnetic wave loss of MXene titanium carbide material and the low electromagnetic shielding efficiency, the developed magnetic induction orientation strategy can realize the same pole arrangement of the magnetic pole of introduced ferrite nanoparticles, control material structure in nanometer scale, rich the pore of MXene titanium carbide ferrite composite film, while inducing MXene titanium carbide sheet orientation in the same pole arrangement process of ferrite magnetic pole.In the preparation process of ferrite nanoparticles, by loading citric acid group on the surface of ferrite, the dispersibility of ferrite in MXene titanium carbide gel is improved, and the interaction between ferrite and MXene titanium carbide is enhanced.The prepared magnetically induced orientation MXene titanium carbide ferrite composite film shows an average electromagnetic shielding efficiency of 62.8 dB in the range of 2-18 GHz, and a highest Herman's orientation factor of 0.938.

Systems and methods for manipulating nano- and micrometer-scale particles are described. The system generally includes an optical imaging system for acquiring an image of a particle sample, a processor for analyzing the image, identifying a particle of interest in the image, and determining a lateral position of the particle of interest within the particle sample, and a vacuum-based probe system including a movable probe and a vacuum pump configured to apply a vacuum to the probe. The processor provides instructions for moving the probe to the lateral position of the particle of interest and instructions for applying a vacuum to the probe such that the particle of interest is pulled away from the particle sample and held at the tip of the movable probe.

The invention discloses a preparation method of a material with a plasmon array and the material. The method comprises the steps that based on a preset nickel female template, imprinting is carried out on a pretreated first original metal sheet; performing anodic oxidation on the first surface of the first original metal sheet to prepare an initial mask plate with an anodic oxidation layer; performing reprocessing on the initial mask plate so as to remove redundant materials on the first original metal sheet under the condition of protecting the anodic oxide layer, thereby obtaining the mask plate; and on the basis of a mask plate, imprinting is performed on the preprocessed second original metal sheet, and the material with the plasmon array is prepared. The material with the array period distance equivalent to the resonance wavelength and coupled with the Bloch wave can be prepared in a secondary imprinting mode, it can be guaranteed that the uniformity and stability of the photon local area are improved under resonance, in addition, the material can inhibit radiation damping through surface plasmon resonance, photons are strongly localized at the nanoscale, and the performance of the material is improved. Therefore, the interaction between the light and the substance is enhanced.

The invention belongs to the field of oil and gas field development, particularly relates to a modeling design method and system for manufacturing a shale oil reservoir oil displacement model based on a silicon wafer, and aims to solve the problem that traditional glass or common materials and a traditional process cannot meet nanoscale processing, so that modeling is not accurate enough. The method comprises the following steps: setting an injection end and an extraction end; modeling and data extraction are carried out on the microscopic pattern of the natural rock core sample, and then microscopic pore throat distribution is re-carved; etching the microscopic pore throat distribution on the surface of the silicon-based chip model through a photoetching machine to obtain a porous medium model body; fluid is injected into the porous medium model body through the injection end, flowing of the fluid in a natural rock core is simulated based on flowing of the fluid in the porous medium model body, and then the fluid is extracted from the porous medium model body through the output end. According to the method, nanoscale etching is carried out, and modeling is more accurate.

This invention belongs to the field of catalytic materials technology, specifically relating to a monodisperse nanoscale BaO-supported MWW molecular sieve catalyst, its preparation method, and its application. The catalyst uses MWW molecular sieve as a support, dispersing and loading BaO nanoparticles. 90-95% of the BaO nanoparticles are monodisperse nano-barium oxide, with an average size in the nanometer range, and at least 90% are dispersed on the outer surface of the molecular sieve. At least 80% of the crystals in the support possessing the MWW topology are 2.5-20 nanometer layered nanosheets. The total specific surface area of ​​the catalyst is 300-500 m². 2 / g, with the external specific surface area accounting for no less than 30% of the total specific surface area. Compared with the prior art, this invention solves the problems of easy agglomeration and poor accessibility of active sites of BaO catalysts. This scheme achieves uniform dispersion of BaO particles at the nanoscale on the outer surface of molecular sieves, thereby exhibiting excellent catalytic activity and selectivity in PET saccharification reaction.

The application discloses a kind of ultrafine-grained titanium alloy materials and in-situ synthesis method thereof, the method comprises: one, according to the component proportion of target product, element powder is mixed;Two, green body is pressed;Three, laser vacuum smelting is obtained metal precursor;Four, metal precursor is heated to melt by electrostatic suspension equipment and is obtained after heat preservation cooling ultrafine-grained titanium alloy material.The application is by using electrostatic suspension process without using mould, so that metal melt is uniformly nucleated in the process of cooling and solidification and the nucleation rate is significantly increased, form far less than the nanometer scale metal ultrafine equiaxed crystal organization of traditional smelting method, simultaneously, the application realizes the in-situ alloying of titanium alloy material, and the degree of freedom of component design is large, without multiple smelting, production cost is reduced;Ultrafine-grained titanium alloy material of the application has high specific strength, high specific modulus, excellent corrosion resistance, good strength plastic / tenacity matching, and is widely used in aerospace, ocean engineering, weapon equipment and other high-tech fields.