24results about How to "Achieving controllable equipment" patented technology

This invention discloses a method for controllable preparation of nanoparticles using a multi-channel microreactor. The method utilizes a microchannel reactor to segment droplets and prepare quantitatively synthesized nanoparticles with controllable particle size. The invention employs capillary action to draw the reaction solution into the microchannel, segmenting one or more droplets (each droplet into 10-100 portions). By changing the width of the microchannel, controllable preparation of nanoparticles within a small range (±3 nm) can be achieved; by changing the length of the microchannel, controllable preparation of nanoparticles within a large range (±10-30 nm) can be achieved. Furthermore, the reactor structure of this invention is simple, enabling highly precise and quantitative synthesis of various nanoparticles. Compared to large-scale reactors, the miniaturization of the synthesis reaction in this invention effectively reduces energy waste and safety hazards, making it highly valuable for applications in safe chemical engineering, green chemical engineering, high-efficiency chemical engineering, microchemical engineering, and precise reaction monitoring.

The invention provides a wurtzite boron nitride / diamond composite material and a preparation method and application thereof, the composite material is composed of two phases of wurtzite boron nitride and diamond, and has a stacked sandwich microstructure, the sandwich microstructure comprises at least one first wurtzite boron nitride layer and at least one second wurtzite boron nitride layer, wherein the first wurtzite boron nitride layer is formed by wurtzite boron nitride; at least one second wurtzite boron nitride layer composed of wurtzite boron nitride; the composite material comprises a first wurtzite boron nitride layer, a second wurtzite boron nitride layer and a diamond layer, the diamond layer is arranged between the first wurtzite boron nitride layer and the second wurtzite boron nitride layer and is made of diamond, wurtzite boron nitride is a metastable phase stably existing under normal pressure, and the Vickers hardness of the composite material is larger than 50 GPa. The novel wurtzite boron nitride / diamond composite material disclosed by the invention has high hardness, high toughness and high thermal stability, and the preparation method disclosed by the invention is low in initial raw material price and simple in preparation process.

The invention discloses a method for synthesizing a hierarchical pore MFI molecular sieve membrane based on a sacrificial crystal seed layer, and belongs to the field of zeolite molecular sieve membrane synthesis. The hierarchical pore MFI molecular sieve membrane with a compact selective top layer and a macroporous transition layer with high porosity is successfully constructed on a porous carrier through a surface wet gel secondary growth technology of a sacrificial crystal seed layer. The film layer structure and the gas separation performance are optimized by regulating and controlling the composition, the aging time and the crystallization time of the synthetic gel. The prepared hierarchical pore MFI molecular sieve membrane shows high permeability and excellent selectivity in n-butane / iso-butane separation, and the preparation process is good in repeatability, high in stability and suitable for industrial gas separation application.

This invention discloses a method for preparing a laser-clad anti-sticking steel coating on the surface of a vertical roller, comprising: accurately quantifying the surface morphology and laser process parameters of the anti-sticking steel coating on the vertical roller, namely, forming a heat dissipation channel size control equation based on a Gaussian heat source model and an elliptical double-beta spray gun model, and determining the corresponding cladding process parameters according to the dimensional parameters of the coating's relevant service performance requirements, thereby achieving controllable preparation of the spiral anti-sticking steel coating. This invention, through effective control of the coating's spiral diameter and the size and shape of protrusions and grooves, ensures the coating's high-temperature wear resistance while reducing friction between the steel pipe and the vertical roller, preventing steel sticking and extending the service life of the vertical roller.

The application provides a wurtzite boron nitride / diamond composite material and a preparation method and application thereof. The composite material is composed of two phases of wurtzite boron nitride and diamond, and has a stacked sandwich microstructure, which comprises at least one first wurtzite boron nitride layer composed of wurtzite boron nitride, at least one second wurtzite boron nitride layer composed of wurtzite boron nitride, and a diamond layer composed of diamond and sandwiched between the first wurtzite boron nitride layer and the second wurtzite boron nitride layer. The wurtzite boron nitride is a metastable phase stably existing under normal pressure, and the Vickers hardness of the composite material is greater than 50 GPa. The novel wurtzite boron nitride / diamond composite material has high hardness, high toughness and high thermal stability, and the preparation method has low starting material price and simple preparation process.

The application belongs to the field of electrocatalytic materials and energy conversion technology, and particularly relates to a Ni nanoparticle and Ni monatomic synergistic catalyst as well as a preparation method and application thereof. The preparation steps of the Ni nanoparticle and Ni monatomic synergistic catalyst include: mixing a soluble zinc salt, a soluble nickel salt and an organic ligand in water, then mixing with a solution containing polydopamine, and sequentially performing light-shield aging, drying and pyrolysis to obtain the Ni nanoparticle and Ni monatomic synergistic catalyst. The application provides a strategy of combining a two-dimensional ZIF-L precursor with PDA bifunctional modification, in the catalyst preparation process, the introduced PDA simultaneously acts as a structure directing agent and a metal size control agent, realizing the synergistic coexistence of Ni monatomic and nanoparticles, precise size control and construction of a hollow leaf-shaped carbon-based carrier. By utilizing the hydrogen overflow synergistic effect between the Ni nanoparticle and the Ni monatomic, the catalytic activity, selectivity and stability of the electrocatalytic reduction of CO2 are significantly improved.

The application discloses a method for controllable preparation of nanoscale calcium carbonate by taking regenerated micro powder as a calcium source, and comprises the following steps: taking the regenerated micro powder obtained by treating the hydrated cement-based material as the calcium source, dispersing the regenerated micro powder in deionized water or a water solution containing magnesium ions to form a reaction system, performing a wet carbonation reaction by introducing carbon dioxide gas into the reaction system, and realizing the regulation of the crystal form and particle size of the obtained calcium carbonate product by synergistically regulating the process parameters such as the composition of the reaction medium, the reaction temperature, the reaction time, the carbon dioxide flow rate and the stirring speed, so as to prepare nanoscale calcite crystal calcium carbonate or nanoscale calcite / aragonite composite crystal calcium carbonate.

The invention discloses mussel-imitating bacteria responsive injectable hydrogel as well as a preparation method and application thereof, and belongs to the technical field of biological medicines. The hydrogel is formed by compounding a mussel-imitating viscous hydrogel bracket and a bacterial response agent, the viscous hydrogel scaffold is QCS-EC (Quaternized Chitosan) and is formed by non-covalent binding of QCS (Quaternized Chitosan) and EGCG (Epigallocatechin Gallate); the bacterial response agent is a supramolecular nano cross-linked compound TEBox-B12, and is formed by self-assembly of box-shaped quaternized pyridine heterocyclic organic salt molecules TEBox and salt containing suprachaotropic liquid anions B12H12-through hydrogen bonds and electrostatic interaction. The hydrogel disclosed by the invention has NIR-II photo-thermal and photodynamic antibacterial treatment functions, and can be used for efficiently killing bacteria in deep tissues; the hydrogel also has high adhesion, good biocompatibility and injectability, is strong in convenience and applicability, can provide a good healing environment for wounds, promotes fibroblast proliferation and migration, accelerates wound tissue regeneration and healing processes, and reduces scar formation.

A high-transparency, energy-saving LOW-E glass and its preparation method are disclosed, belonging to the field of LOW-E glass technology. The high-transparency, energy-saving LOW-E glass includes a glass substrate and a composite film layer sequentially deposited thereon. The composite film layer includes a bottom layer, a functional layer, and a protective layer. The bottom layer is an antimony-doped silicon dioxide layer with a gradient doping structure, wherein the doping concentration gradually decreases from bottom to top along the thickness direction. The functional layer includes a first functional sublayer and a second functional sublayer. The first functional sublayer is a fluorine-doped tin oxide layer, and the second functional sublayer is a titanium-doped zinc oxide layer, with a compositional gradient transition region formed between the first and second functional sublayers. The protective layer is a silicon nitride layer. The high-transparency, energy-saving LOW-E glass of this invention has high light transmittance, excellent thermal insulation performance, good chemical stability, and can undergo subsequent deep processing.

The application discloses a preparation method of gamma-phase germanium selenide nanosheets. The application realizes controllable preparation of high-quality gamma-phase germanium selenide nanosheets by adopting a normal-pressure vapor deposition method and based on a rapid cooling strategy. The application realizes controllable growth of gamma-phase germanium selenide nanosheets with different lateral sizes by controlling growth temperature. The application does not need to plate a catalyst such as gold on a substrate surface, and the preparation process is relatively simple. The prepared gamma-phase germanium selenide nanosheets have great application potential in flexible sensors, photoelectric devices, especially near-infrared photoelectric detectors and the like. The gamma-phase germanium selenide nanosheets prepared by the application are still very stable after being placed in air for half a year, and also provide a good experimental platform for subsequent physical property research on the material.

This invention discloses a method for preparing an ultrathin ordered macrocyclic molecular membrane. The method involves synthesizing macrocyclic molecules with high polymerization activity and amphiphilic guest molecules. The inclusion complexes formed by the macrocyclic molecules and guest molecules are orderedly assembled using Langmuir-Blodgett (LB) technology. Photopolymerization is then employed to achieve ordered cross-linking of the macrocyclic molecules, resulting in an ultrathin ordered macrocyclic molecular membrane. The macrocyclic molecular membrane prepared by this invention is monomolecular in thickness and possesses good mechanical strength. With the assisted orientation of the amphiphilic guest molecules, the macrocyclic molecules achieve ordered assembly at the water-air interface. The membrane preparation process proposed in this invention is simple, cost-effective, versatile, and easily scalable, making it significant for the field of high-performance separation membranes.

This invention provides a method and application for the controllable recovery of a specific cobalt-nickel ratio product from a cobalt-nickel mixed solution. The method includes the following steps: adding a complexing agent to the cobalt-nickel mixed solution and adjusting the pH of the solution to acidic, thus obtaining an electrolyte; using the electrolyte as the working electrolyte in an electrodeposition system, performing an electrodeposition reaction under constant potential conditions, causing the specific cobalt-nickel ratio product to deposit on the cathode surface; wherein the cobalt-nickel mixed solution contains cobalt ions and nickel ions. The recovery method of this invention is simple in procedure, reduces production costs, improves recovery efficiency and environmental friendliness, and has good prospects for industrial application.

The invention discloses a 2-x-terephthalic acid copper-based MOFs (Metal-Organic Frameworks) micro-nano sheet and a preparation method and application thereof, and the method comprises the following steps: dropwise adding a copper chloride dihydrate solution into a pre-deprotonated 2-x-terephthalic acid solution, stirring to react, and centrifugally washing and drying the product to obtain the 2-x-terephthalic acid copper-based MOFs micro-nano sheet, x is one of methyl, amino or hydroxyl. The 2-x-terephthalic acid copper-based MOFs micro-nano sheet can be used for electrocatalytic reduction of carbon dioxide. The 2-x-terephthalic acid copper-based MOFs micro-nano sheet prepared by the invention has a unique folded sheet structure, the specific surface area and the exposure degree of active sites of the material are remarkably increased, and mass transfer and charge transfer paths are shortened, so that the kinetics and energy efficiency of a catalytic reaction are integrally optimized.

This invention belongs to the field of electronic component technology, and discloses a SnTe material for a nitrogen dioxide gas sensor, its preparation process, and its application. The SnTe material is synthesized via a solvothermal method. The nitrogen dioxide gas sensor mainly consists of a gas-sensitive material and gold interdigitated electrodes. The gas-sensitive material is coated on the surface of the gold interdigitated electrodes with a coating thickness of approximately 15mm to 75mm. The gas-sensitive material is SnTe. This invention provides a simple, low-cost, safe, and controllable TMDC nanomaterial preparation scheme. Using ethanolamine as a solvent and coordinating agent, and potassium hydroxide aqueous solution as a tellurium source activator, this invention synthesizes SnTe nanomaterials in one step via a solvothermal method. The SnTe nanomaterials prepared by this invention achieve a small nanoscale size. A large number of small-sized nanomaterials can effectively increase the sufficient contact between the material and gas molecules, improving the residence rate of gas molecules on the nanomaterial surface.

The application discloses a kind of modular hydrogel based on liquid shaping technology, preparation method and application thereof.The method first utilizes the plasticity of liquid rubber clay, and obtains the temporary mold of specific shape by pressing or cutting, which is composed of micro-nano particle shell;The mixture containing photosensitive hydrogel precursor, nanoclay and functional factor is injected into the mold and light-cured to form a hydrogel module;Optionally, after removing the particle mold, a functionalized hydrogel module with specific morphology, non-adhesion to the substrate and adjustable mechanical properties is obtained;Finally, different functional modules are bonded and cured by hydrogel precursor to integrate into a modular hydrogel with spatial heterostructure.The application uses micro-nano particle shell as a shapeable and removable temporary mold, realizes the adjustable design of hydrogel macroscopic morphology, mechanical properties and spatiotemporal sequence of drug release, and has wide application prospect in the field of tissue engineering and regenerative medicine.

The invention discloses a method for preparing spherical nano barium fluoride, spherical barium fluoride smaller than 5nm is synthesized by a microemulsion reaction method, and the microemulsion is temperature-responsive and does not contain a surfactant. Controllable preparation of the spherical barium fluoride with the ultra-small size smaller than 5 nm under the surfactant-free condition is achieved for the first time. A ternary surfactant-free microemulsion system composed of diethylene glycol monohexyl ether, octane and water is constructed, the amphiphilic solvent characteristic of diethylene glycol monohexyl ether is used for replacing a traditional surfactant, and the dependence of an existing template method on the surfactant is successfully broken through. The particle size of the obtained BaF2 product is only smaller than 5 nm and enters a strong quantum confinement scale range, and the preparation blank of a barium fluoride material in the field of sub-5-nm ultra-small solid spheres is filled.

This invention relates to the field of lithium-ion battery cathode material technology, specifically a high-performance lithium-rich manganese-based cathode material based on pretreated boron nitride, its preparation method, and its application. The preparation method includes: introducing hydroxyl and amino groups onto the surface of boron nitride nanosheets; preparing a composite precursor powder by mixing a nickel-cobalt-manganese hydroxide precursor, a lithium source, TiO2, a phosphorus source, and pretreated boron nitride; sequentially performing conventional pre-calcination, a first-segment Joule heat treatment, and a second-segment Joule heat treatment; performing a third-segment instantaneous Joule heat treatment, followed by quenching; by introducing a surface-functionalized high thermal conductivity boron nitride network into the bulk phase of the material, and combining a programmed sequential heat treatment of "pre-calcination-two-segment Joule heat treatment" with instantaneous surface melting and quenching, this method effectively solves the inherent thermal gradient problem of the Joule heating method, simultaneously achieving high bulk phase homogenization and surface stabilization, resulting in a product with excellent comprehensive electrochemical performance.

The invention discloses a growth base station for preparing large-size single crystal diamond and a preparation method of the growth base station. The growth base station comprises a base, a main groove and an auxiliary groove located at the bottom of the main groove, and the depth relation meets the following conditions: the depth of the auxiliary groove is 1t; and the seed crystal thickness is less than or equal to the sum of the auxiliary groove depth and the main groove depth. The preparation method comprises the following steps: S1, screening seed crystals; s2, cloning, separating and processing the seed crystal to obtain a prepared seed crystal with the surface roughness Ra being less than or equal to 10nm and the thickness difference being less than or equal to 5mu m; s3, finishing the growth surface and the side surface of the prepared seed crystal, and determining the step flow direction; s4, loading the seed crystal into the auxiliary groove of the base station according to the step flow direction, fixing, and carrying out first epitaxial growth under negative bias; and S5, carrying out vacuum annealing, cutting polishing and secondary epitaxial growth on the growth body. The stable and closed growth environment is provided for the seed crystal through the base station structure, and the process is combined, so that the crystal quality at the splicing seam is effectively improved, and the preparation of the high-quality large-size single crystal diamond is realized.

The invention belongs to the technical field of nano material preparation, and particularly relates to a method for preparing a few-atomic-layer ultrathin SnSe nanosheet based on an intercalation compound precursor. The invention discloses a method for preparing a low-atomic-layer ultra-thin (lt; lt) material by taking ethanolamine as an intercalator based on an intercalation-de-intercalation strategy. According to the method, ethanol amine is used as an intercalator through a hydrothermal method, an ethanol amine intercalated SnSe hybrid precursor is firstly synthesized, then the ultrathin SnSe nanosheet is obtained through deintercalation treatment, the thickness of the prepared nanosheet can reach the atomic level (about 2-3 atomic layers), and the method is simple in process, low in cost, high in product quality and suitable for industrial production. The problems that an existing process is complex, and product size and thickness are difficult to control are solved. In addition, the ultrathin SnSe nanosheet prepared by the method shows excellent application prospects in the fields of piezoelectric devices, photoelectric detection, flexible electronics, energy conversion and the like.

The invention belongs to the technical field of porous carbon materials, and particularly relates to a gradient pore porous carbon material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a carbon source precursor, a soft template and a densification carbonization component, adding a gas release hole regulator and a heteroatom introducing agent, mixing, mixing with a solvent, granulating, carrying out pre-curing treatment and segmented carbonization treatment, carrying out graded gas activation treatment, and finally carrying out post-treatment and heat treatment to obtain the carbon-based composite material. The gradient pore porous carbon material is obtained. According to the method, a continuous mesoporous channel network is constructed through a phase separation soft template, fine trimming and concentration of micropore diameters and channel dredging are achieved through graded gas activation, and the compaction density and the electric conduction continuity are improved by introducing a char-forming densification and structure shape locking strategy; the gradient pore porous carbon material which has high specific capacitance, high rate performance and high volume capacitance and is suitable for thick electrodes and high-surface-density electrodes is obtained, and the gradient pore porous carbon material has the advantages of being mild in process, good in repeatability, easy to amplify and low in aftertreatment burden.

This invention proposes a circularly polarized photodetector based on a triangular ferroelectric nanoisland structure and its fabrication method, belonging to the technical field of ferroelectric materials. It addresses the problems of traditional spintronic devices, such as reliance on external magnetic fields, low energy efficiency, complex structures, and insufficient sensitivity of existing circularly polarized photodetectors. The circularly polarized photodetector of this invention consists of a bottom electrode, a substrate, a ferroelectric layer, and a top electrode stacked sequentially from bottom to top. The substrate is an Nb-doped SrTiO3 substrate, and the ferroelectric layer is an Eu-doped BiFeO3 thin film. The Nb-doped SrTiO3 substrate and the Eu-doped BiFeO3 thin film form a p-n heterojunction. This invention achieves self-driven detection without an external bias voltage, effectively suppresses dark current, and significantly improves the axial selectivity response of circularly polarized light by utilizing the synergistic effect of the chiral geometry of the nanoislands and intrinsic spin splitting. The fabrication process is mature and facilitates large-scale integration applications.

The application discloses a kind of micro-jet continuous preparation methods of micro-pleated spherical silver powder, to solve the problem that traditional stirring reaction method is difficult to continuously prepare high sphericity, high dispersibility and surface has regular micro-pleated structure silver powder using micro-jet mixing reaction mode.The method comprises: configuration and filtration silver precursor and reducing agent solution;Temperature is controlled to 15-35 DEG C respectively;Two solutions are pumped into Y type micro-jet reactor with flow ratio 1:1 by metering pump, and high-speed collision mixing is formed at a certain flow and angle at the reactor outlet, efficient mixing and reaction are realized;Add total addition amount is 1% of silver nitrate weight Gelatin and stearic acid as dispersion stabilizer to inhibit agglomeration and control wrinkle morphology;After suction filtration, washing and vacuum drying, the product is obtained.By using the above technical scheme, continuous, high-stability preparation of micro-pleated high-sphericity silver powder can be realized, and the process method is easy to expand production by modularization.

The invention discloses an MXene and high-entropy metal phosphide composite electrode material and a preparation method and application thereof.The MXene and high-entropy metal phosphide composite electrode material is characterized in that a three-dimensional porous substrate serves as a framework, MXene is loaded on the three-dimensional porous substrate, and five-element high-entropy metal phosphide CoNiZnFeMnP is loaded on the surface of the MXene; wherein MXene is Ti < 3 > C < 2 > T < x >, Al atoms between layers are removed through etching of a TiAlC < MAX > phase, and a surface functional group T < x > is introduced, so that MXene is obtained. The MX-coated CoNiZnFeMnP prepared by the invention has a relatively large specific surface area, a large number of active sites and abundant heterogeneous interfaces, and the composite electrode material has a unique multi-stage flower-shaped hierarchical structure, a remarkable high-entropy effect and a strong interface coupling effect, shows extremely high catalytic activity, excellent charge transfer capability and industrial-grade long-term stability, and has a good application prospect. The electrocatalyst can be used as an efficient bifunctional electrocatalyst, and is widely applied to hydrogen evolution, oxygen evolution and full hydrolysis reaction in the water electrolysis process. Meanwhile, the preparation method disclosed by the invention has the advantages of simplicity, convenience, low cost and easiness in large-scale production, effectively overcomes the bottleneck in the background technology, and provides a new idea for developing a high-performance difunctional electrocatalyst.

The application relates to a polylactic acid polyester nanosheet powder and a preparation method and application thereof, relates to the technical field of high polymer materials, and solves the problem that the preparation technology of the polylactic acid polyester powder cannot simultaneously consider simple process, low equipment cost, controllable morphology and avoidance of exogenous impurity residues. The application adds a polymer into a mixed solvent, stands, obtains a polymer gel, adds a solvent into the polymer gel, stirs to obtain a suspension, filters and dries the suspension to obtain the polylactic acid polyester nanosheet powder, and the polylactic acid polyester nanosheet powder can be applied to the fields of drug slow-release carriers, medical and beauty tissue filling materials and 3D printing materials. The application realizes controllable preparation of a polylactic acid polyester nanosheet structure, significantly reduces monomer residue rate (0.10% to 0.15%) and solvent residue rate (0.01%) of the polylactic acid polyester nanosheet powder, and further greatly reduces impurity residue risk.