61results about How to "Aperture adjustable" patented technology

The invention discloses a preparation method of a self-humidifying membrane electrode of a proton exchange membrane fuel cell, relates to a preparation method of a membrane electrode, and aims to solve the technical problem of poor performance of the conventional self-humidifying membrane electrode. The method comprises the following steps: 1, synthesizing a COFs material by using 2, 4, 6-triformyl phloroglucinol and 2, 5-diaminobenzene sulfonic acid through a two-phase method; 2, preparing slurry a by using a Pt / C catalyst and a perfluorosulfonic acid ionomer solution; preparing self-humidifying catalyst layer slurry b from a COFs material, a Pt / C catalyst and a perfluorosulfonic acid ionomer solution; and 3, coating the slurry a on the anode surface of the proton exchange membrane, and coating the slurry b on the cathode surface to obtain the self-humidifying membrane electrode. According to the electrode, H2 / O2 is used as fuel, and the power density is 756.3 mW / cm < 2 > under the relative humidity of 20%; h2 / air is used as fuel, the power density is 437.8-879.7 mW / cm < 2 > under the relative humidity of 50%, and the material can be applied to the field of fuel cells.

The invention provides a negative electrode lithium supplement agent, a preparation method and application of the negative electrode lithium supplement agent in a lithium ion battery, the negative electrode lithium supplement agent comprises a metal organic framework, lithium nanoparticles and a thin carbon film, and the metal organic framework and the lithium nanoparticles are packaged in the thin carbon film in situ. The negative electrode lithium supplement agent has higher safety performance, conductivity and stability, and can effectively prevent the safety problem caused by high activity of lithium powder.

The invention discloses a flexible three-dimensional MOF (Metal Organic Framework) array SERS (Surface Enhanced Raman Scattering) substrate and a preparation method thereof. The flexible three-dimensional MOF array SERS substrate comprises a flexible substrate, a three-dimensional MOF periodic array layer and a gold nanoparticle film which are sequentially arranged from bottom to top. The three-dimensional ordered MOF periodic array structure on the substrate can provide more attachment points for the gold nanoparticles, and high-density hot spots are formed; meanwhile, the MOF material has the advantages of high porosity, large specific surface area, adjustable aperture and the like, and can adsorb and capture a target analyte, so that to-be-detected molecules are concentrated and enriched in a hot spot region, and finally, the SERS activity is improved. The SERS substrate is a flexible substrate and can be directly attached to the surface of a complex to-be-detected object, and in-situ detection is achieved. The method has the characteristics of high sensitivity, good repeatability and wide applicability, and provides important support for rapid detection in food safety and environment monitoring.

The invention discloses a composite material catalyst MFe2O4 / NH2-MIL-68 (In)-x as well as a preparation method and application thereof, and belongs to the technical field of industrial catalysis. NH2-MIL-68 (In) is used as a carrier, spinel type ferrite MFe2O4 is loaded on the NH2-MIL-68 (In) to form the composite material catalyst, M represents Co or Cu, x represents the percentage content of MFe2O4 in the composite material, the value of x is 10-60, and the unit is%. Through effective compounding of the indium-based MOF material and the spinel type ferrite MFe2O4, the advantages of large specific surface area and multiple metal active sites of the indium-based MOF material and the spinel type ferrite MFe2O4 are fully utilized, the synergistic effect of the indium-based MOF material and the spinel type ferrite MFe2O4 in the aspects of gas adsorption and catalytic hydrolysis is exerted, the COS hydrolysis catalytic activity and the reaction rate are improved, the removal rate of COS in waste gas at 120-150 DEG C can reach 92-96%, and the removal rate of COS in waste gas at 120-150 DEG C can reach 92-96%. The catalyst is suitable for medium and low temperature catalytic hydrolysis removal of carbonyl sulfide in benfenacet synthesis waste gas.

The invention provides a carbon carrier for a catalyst, a preparation method of the carbon carrier, a fuel cell catalyst and a membrane electrode, and belongs to the technical field of fuel cells. The preparation method comprises the following steps: S1, uniformly mixing a carbon source, a nitrogen source, a phosphorus source and a template agent to obtain a mixture; wherein the template agent is selected from at least one of magnesium oxide, magnesium hydroxide, magnesium citrate, magnesium gluconate, magnesium acetate, basic magnesium carbonate, zinc oxide nanorods, titanium dioxide and mesoporous alumina; the mass ratio of the template agent to the carbon source is (0.1-15): 1; s2, calcining the mixture to obtain a calcined product; and S3, stirring the calcined product in an acid solution, filtering, washing and drying to obtain the carbon carrier. The carbon carrier obtained by the preparation method can have a relatively high mesopore ratio, an excellent graphitization degree and a proper heteroatom doping condition at the same time, and the electrochemical performance and durability of a fuel cell catalyst can be effectively improved.

The invention belongs to the technical field of flow batteries, and discloses a porous diaphragm for a flow battery and a preparation method thereof.The porous diaphragm comprises a polymer porous base membrane and polyelectrolyte nanoparticles which are electrostatically adsorbed on the surface of the polymer porous base membrane and openings of surface through holes, the polyelectrolyte nanoparticles are formed by cross-linking a polyanion electrolyte and a polycation electrolyte; the polyelectrolyte nano-particles are electrostatically adsorbed to openings of through holes in the surface of the polymer porous base membrane to form a rivet structure; the preparation method comprises the following steps: preparing a polymer porous base membrane from a polymer membrane casting solution in a non-solvent induced phase separation manner, then alternately soaking the polymer porous base membrane in an acidic salt solution of polycation electrolyte and a salt solution of polyanion electrolyte in sequence, and finally cross-linking in a cross-linking agent aqueous solution to obtain the porous diaphragm for the flow battery. The porous diaphragm prepared by the invention has high chemical stability, high dimensional stability and low vanadium ion permeability, and also has excellent cycle stability.

The invention belongs to the technical field of hydrogel biological materials. Aiming at the problem that the pore size of hydrogel cannot be effectively reduced by the post-treatment method of the existing hydrogel membrane material, the invention provides a preparation method of a hydrogel compound, which is used for reducing the pore size of a biological hydrogel material. The preparation method comprises the following steps of: soaking in a pre-polymerization solution containing methyl methacrylate, 2-hydroxyethyl methacrylate and ethylene glycol dimethacrylate, and carrying out free radical polymerization reaction, so as to generate a composite hydrogel material with smaller pore diameter or no pore. The method is simple to operate and rapid in preparation; by adjusting the concentration of the pre-polymerized solution, the hydrogel and the acrylate polymer in the prepared composite hydrogel are interspersed with each other, and the pore diameter of the composite hydrogel can be adjusted.

The invention relates to the technical field of gas separation materials, in particular to a preparation method of a high-selectivity functionalized ZIF-7-8 mixed matrix membrane. The preparation method comprises the following steps: taking pebax-1657 as a matrix material of a mixed matrix membrane, synthesizing a ZIF-7-8 filling material by virtue of a non-solvent induced crystallization (NSIC) method, then carrying out ionic liquid impregnation on ZIF-7-8, and finally preparing the high-performance mixed matrix membrane in a blending manner, so as to obtain the functional modified ZIF-7-8 mixed matrix membrane material. 1-butyl-3-methylimidazole bis (trifluoromethanesulfonyl) imide salt ([bmim] [Tf2N]) is adopted as an ionic liquid, ZIF-7-8 is subjected to functionalization treatment through a post-synthesis method, and the ionic liquid with high affinity to CO2 is loaded in a nanomaterial pore cage, so that the adsorption capacity of the material to CO2 is improved, and the performance of the membrane material is further optimized; therefore, the purpose of improving the CO2 separation performance of the mixed matrix membrane is achieved.

The utility model discloses a Lamberg distribution tester which comprises an instrument cabin, a diaphragm is arranged in the instrument cabin, a spectrograph is arranged on one side of the diaphragm and connected with the diaphragm through an optical fiber, a rotating table is arranged on the other side of the diaphragm, a light-emitting device is arranged on the rotating table, and the rotating table drives the light-emitting device to rotate. And light emitted by the light-emitting device passes through the diaphragm and then is input into the spectrograph. Furthermore, a calibration light source is arranged on one side of the diaphragm, the calibration light source is connected with the diaphragm through an optical fiber, and light emitted by the calibration light source passes through the optical fiber, penetrates through the diaphragm and reaches a light emitting point of the light emitting device. In conclusion, according to the Lamberg distribution tester provided by the embodiment of the invention, through the innovative designs such as the subdivision design, the high-precision diaphragm, the high-resolution spectrometer and the rotatable light-emitting device, the stability, flexibility and accuracy of a test system are remarkably improved, and an efficient and reliable solution is provided for the test of light source characteristics.

The invention discloses a preparation method and application of a double-quencher Au-coated NiFeMOFs (gold-coated NiFeMOFs) composite material. According to the preparation method of the double-quencher Au-coated NiFeMOFs composite material, NiFeMOF serves as a carrier, gold nanoparticles are evenly loaded on the surface of the NiFeMOF through a surface in-situ reduction method, and the Au-coated NiFeMOF composite material is obtained through synthesis. The porous structure and the high specific surface area of the prepared NiFeMOF can prevent aggregation of gold nanoparticles and improve more active sites, and the gold nanoparticles can improve the conductivity and the electro-catalytic activity of the frame structure, so that the Au-coated NiFeMOF composite material shows excellent electrochemical performance. The preparation method is simple in process, raw materials are easy to obtain, cost is low, large-scale production can be achieved, and the prepared composite material has the advantages of being consistent in shape, stable in performance, excellent in electrochemical performance and the like.

This invention belongs to the field of fluorescent detection materials technology, specifically disclosing an open-type colorimetric fluorescent covalent organic polymer and its preparation and application. The preparation includes the following steps: dissolving 4,4',4''-(1,3,5-triazine-2,4,6-triyl)tris(2,6-dimethylaniline) and trialdehyde-resorcinol in 1,4-dioxane; uniformly adding acetic acid via ultrasonication; degassing three times using a refrigerated pump followed by heating reaction; sequentially washing with tetrahydrofuran and dichloromethane using a Soxhlet washing method; drying; passing through a 200-mesh sieve; and dry grinding. This invention utilizes the aforementioned open-type colorimetric fluorescent covalent organic polymer and its preparation and application. This open-type colorimetric fluorescent covalent organic polymer reacts sensitively with aminourea and 3,5-dinitro-2-hydroxyphenylenehydrazine, and can be used in open-type fluorescent chemical sensors to reduce the influence of other impurities on the detection results, thereby improving the detection sensitivity.

The invention provides a preparation method of an N-doped graded porous carbon material, and belongs to the technical field of environmental functional materials and water treatment.The preparation method comprises the steps that a microporous self-template carbon source and a nitrogen source are dissolved in water together, and a mixed solution is obtained; freeze-drying the mixed solution to obtain a mixed material; performing high-temperature carbonization on the mixture in an inert atmosphere, and washing and drying an obtained product to obtain the graded porous carbon material, wherein the microporous self-template carbon source comprises potassium sodium tartrate, and the nitrogen source comprises any one of urea, dicyandiamide, ammonium chloride and thiourea. The graded porous carbon material prepared by the method has excellent adsorption performance on trace organic pollutants and can be used for adsorbing and removing the micropollutants in water, and the method does not need additional physical and chemical activation, is low in manufacturing cost, is easy to realize large-scale industrial production and has a good application prospect. The invention also provides an N-doped graded porous carbon material and application thereof.

The embodiment of the present application relates to a kind of copper intermetallic compound porous materials and its preparation method and application, wherein, preparation method includes: metal Mg, Zn, Cu, M is mixed, is handled by induction smelting, and MgZnCuM alloy ingot is obtained;MgZnCuM alloy ingot is treated by spinning, and MgZnCuM precursor is obtained;MgZnCuM precursor is placed in gas phase de-alloying system and is treated by first vacuum heat treatment, and copper intermetallic compound porous material MgCuM is obtained;MgCuM has double continuous structure.The preparation method is simple and easy to operate, pore size is adjustable, and pore distribution is uniform, and the preparation process is environment-friendly and pollution-free.

The invention discloses a dsRNA nano preparation for preventing and controlling phytophthora capsici as well as a preparation method and application of the dsRNA nano preparation. The nucleotide sequence of the phytophthora capsici sugar transporter protein HXT4 gene is as shown in SEQ ID NO.1, and the ASPN-dsRNA nano preparation is obtained by mixing dsRNA as shown in SEQ ID NO.2 and amino-modified mesoporous silica. By exogenous application of the ASPN-dsRNA nano preparation, gene expression silencing of the target gene phytophthora capsici sugar transporter HXT4 is induced, so that pathogenicity of phytophthora capsici is reduced or even lost, and the purpose of protecting crops is achieved. The preparation can effectively reduce the pathogenicity of phytophthora capsici, the inhibition rate on phytophthora capsici infection can reach 72%, and the prevention and control efficiency on phytophthora capsici reaches 87%. The ASPN-dsRNA nano preparation is high in stability and obvious in prevention and control effect, and provides a new prevention and control strategy and means for developing a precise prevention and control method for crop epidemic diseases.

The present application relates to the technical field of composite material pressing die, in particular to a modular sample preparation die for drum peel test and a sample preparation method thereof, wherein the modular sample preparation die comprises, sequentially stacked in the vertical direction: an upper die plate, an intermediate cavity plate and a lower die plate, and a hole forming pin; the intermediate cavity plate is provided with a main cavity penetrating through itself in the vertical direction, at least one end of the main cavity is provided with an extension cavity communicating with itself in the horizontal direction, and the extension cavity does not penetrate the intermediate cavity plate in the vertical direction; the hole forming pin penetrates at least the upper die plate and the intermediate cavity plate, and is inserted into the interior of the extension cavity. The present application can directly form a drum peel test sample with a hole at one time; the position, aperture and pitch of the clamping hole are adjustable, and no flash is formed between the main body and the extended end of the drum peel test sample.

The invention relates to the technical field of sodium ion batteries, and in particular to a MOF-derived screening type carbon sodium negative electrode material and a preparation method and application thereof. The preparation method comprises: preparation of a MOF-derived porous carbon material precursor and preparation of a screening type carbon negative electrode material, wherein the MOF-derived porous carbon material precursor is prepared by heat-treating and modifying a MOF material and a nitrogen source; the screening type carbon negative electrode material is prepared by chemical vapor deposition processes of the MOF-derived porous carbon material precursor twice at the same temperature and with different carbon source gases; the MOF-derived screening type carbon sodium negative electrode material has a rich closed-pore structure and the pore size of micropores in the closed-pore structure is adjustable, and is used in a sodium ion battery, with a first-cycle reversible capacity of 419 mAh / g, an initial coulombic efficiency of 89%, and a capacity retention rate of up to 75% at -30°C. Compared with the prior art, the technical problem that the prior art cannot have both a rich closed-pore structure and an adjustable pore size, resulting in poor energy density and poor low-temperature performance of the sodium ion battery, is solved.

This invention relates to the field of nanomaterials technology, specifically to a method for preparing silica using continuous flow. The method involves mixing an organic base, a surfactant, and water to obtain solution A; mixing a silicon source and an organic solvent to obtain solution B; reacting solutions A and B through a continuous flow apparatus, separating the solid product, and calcining it to obtain silica; wherein the flow rates of solutions A and B are 5-10 mL / min, and the reaction temperature is 20-45℃. In this method, silica is prepared using a continuous flow process, and the prepared silica has a nanosphere morphology with a specific surface area of ​​200-800 m². 2 / g, with a pore size distribution of 2-50 nm and a particle size distribution deviation (PDI) of less than 2%.

The present invention relates to a polyvinylidene fluoride hollow fiber membrane with an easy-to-clean pore structure, which includes an outer membrane structure and an inner membrane structure, both of which are prepared by a thermo-induced phase spinning process, and are synchronously extruded by two twin-screw extruders and respectively formed by two layers of dies, wherein the pore structures of the outer membrane structure and the inner membrane structure have different pore diameters, and the pore diameter of the pore structure of the inner membrane structure is larger than that of the pore structure of the outer membrane structure. The present invention also provides a method for preparing a polyvinylidene fluoride hollow fiber membrane with an easy-to-clean pore structure. The present invention uses the same thermo-induced phase membrane making process to ensure the effective combination of the inner membrane raw material and the outer membrane raw material from the source, avoid the membrane stratification problem, and the pore diameter is adjustable; and the present invention changes the structural morphology of the hollow fiber membrane with a single pore structure in the past, and effectively avoids the problem of the membrane product being difficult to clean after being blocked during operation by forming two layers of pore structures with uniform size and filter pore diameters that increase from small to large from the outside to the inside.

The present invention provides a plastic powder feeding device, which relates to the field of plastic powder processing technology. The plastic powder feeding device comprises a box, a reciprocating mechanism, an adjusting mechanism, a screening mechanism and a conveying mechanism. The output end of the reciprocating mechanism is provided with a connecting gear, the upper side of the connecting gear is meshedly connected with a first rack fixedly connected to the inner wall of the box, the lower side of the connecting gear is meshedly connected with a second rack slidably connected to the inner wall of the box, the right end of the second rack is fixedly connected with a dividing hopper, the interior of the box is provided with two synchronous and reversely rotating crushing rollers, the adjusting mechanism drives the two crushing rollers to adjust the spacing, the inner bottom side of the box is provided with an upper screen plate and a lower screen plate, the screening mechanism drives the upper screen plate and the lower screen plate to reciprocate synchronously and reversely, and realizes the adjustment of the moving distance. The present invention can crush and screen materials while ensuring the linkage of the overall device, and the subsequent feeding effect is good.

The invention belongs to the field of alumina powder preparation, and particularly relates to a method for preparing spherical Al2O3 nanocrystals at low temperature, which mainly comprises the following steps: S1, preparing a porous material; s2, preparing a carboxyl precursor; s3, preparing an aluminum oxide precursor; and S4, calcining the precursor to obtain the spherical nano aluminum oxide. The preparation method comprises the following steps: grafting carboxyl into a porous material to obtain a carboxyl precursor material, adsorbing boehmite with a proper particle size on the surface of a pore channel by virtue of a relatively large specific surface of the porous material, replacing an aluminoxane precursor with carboxylic acid, and decomposing or carbonizing the carboxyl precursor by virtue of subsequent one-step high-temperature pyrolysis, so as to obtain the porous material. Partially decomposed long-chain organic groups or degraded carbides thereof can inhibit too fast growth of aluminum oxide particles and reduce the transformation temperature of an alpha-Al2O3 phase, and spherical nano alpha-Al2O3 with the size of 20-30 nm can be obtained.

The invention discloses a preparation method of a mesoporous titanium dioxide nano composite material coated with iron oxyhydroxide. The preparation method comprises the following steps: preparing a FeOOH (at) mTiO2 nano composite material, taking FeCl3. 6H2O as a precursor, taking tetrabutyl titanate as a titanium source, and taking ammonia water as a pore regulator. As a nano composite material, the nano composite material is used for capturing exosomes and is combined with an electrochemical sensor to establish a method for quantitatively detecting the exosomes. The method for quantitatively detecting the exosome by the electrochemical sensor, which is simple to operate and high in sensitivity, is realized by taking the FeOOH (at) mTiO2 nano composite material as an electrode material.

The invention is applicable to the technical field of electrocatalysis, and provides a preparation method of a nitrogen-doped carbon nanotube (NCNT) packaged CoCu bimetallic electrocatalyst, which comprises the following steps: cleaning carbon cloth (CC); the preparation method comprises the following steps: dissolving Co (NO3) 2.6 H2O and CuCl2. 2H2O in deionized water, dissolving 2-methylimidazole in deionized water, mixing the two solutions, immersing a CC substrate in the mixed solution, and standing at room temperature; cleaning the obtained product, and drying the product to obtain CoCu-MOF / CC; and putting the CoCu-MOF / CC into a porcelain boat, putting the porcelain boat containing a melamine ethanol solution in front of the CoCu-MOF / CC, and heating and calcining to obtain the CoCu-coated NCNT / CC. The invention further provides the nitrogen-doped carbon nano tube packaged CoCu bimetallic electrocatalyst and application of the nitrogen-doped carbon nano tube packaged CoCu bimetallic electrocatalyst. According to the preparation method, MOF is selected as a template, CoCu-MOF grown on a CC substrate in situ is taken as a precursor, alloy particles are packaged in a carbon layer through a coating effect, so that agglomeration and corrosion of an alloy catalyst are effectively avoided, pyrolysis in-situ conversion is performed under the assistance of melamine, an electronic structure is adjusted, a reaction energy barrier is reduced, excellent activity and durability are realized, and OER catalytic activity is efficiently promoted.

A temperature-responsive water harvesting hydrogel and a preparation method thereof, the water harvesting hydrogel is composed of N-isopropyl acrylamide, N,N,N',N'-tetramethylene ethylenediamine, N,N-methylene bisacrylamide, polyethylene glycol, ammonium persulfate and black titanium dioxide. The temperature-responsive water harvesting hydrogel of the present application combines the adjustable pore size of hydrophilic polyethylene glycol, the temperature response characteristics of N-isopropyl acrylamide and the excellent light-heat conversion performance of black titanium dioxide nanoparticles, and can be used as an efficient solar "switch". The temperature-responsive water harvesting hydrogel of the present application has good ability to remove pollutants tetracycline in water and sterilization ability under sunlight; has excellent water harvesting capacity; can realize self water harvesting-release cycle, thereby significantly improving water use efficiency and reducing water resource waste.

The invention relates to the technical field of sound source localization microphone array design, in particular to a multi-band sound source localization microphone array mounting device. The installation device comprises a center array disc, the center array disc comprises a supporting ring and a supporting disc arranged in the center, the supporting ring and the supporting disc are connected through a plurality of spirally-distributed array supporting arms, the array supporting arms are in central symmetry, and the outer side of the supporting ring of the center array disc is detachably connected with one end of an array main supporting arm. The array main supporting arms correspond to the array supporting arms in a one-to-one mode, and the other ends of the array main supporting arms are detachably connected with the array secondary supporting arms. According to the invention, the aperture of the microphone array can be adjusted, the aperture of the microphone array can be changed along with the change of the sound source positioning frequency, the array with various array apertures can be obtained through the disassembly and assembly of the array main support arm and the array secondary support arm, the aperture of the microphone array is increased in a stepped manner, and the stepped expansion of the positioning frequency band is realized.

This invention relates to medical-grade polyetheretherketone (PEEK) composite materials, their preparation method, and human bone implants, belonging to the field of medical materials technology. It addresses the limitations of existing human bone implants in promoting bone tissue regeneration and repair, as well as their poor antibacterial properties. The composite material comprises 1000 parts PEEK powder, 100-500 parts of HAP-modified ZIF-8 composite material after sizing, 1-3 parts of silane coupling agent, and 2-5 parts of calcium stearate. The sizing-treated HAP-modified ZIF-8 composite material is obtained by reacting HAP, methylimidazole, and anhydrous zinc nitrate in a DMF solution of polyetherimide; wherein HAP comprises 3-21 parts, methylimidazole 100-350 parts, and anhydrous zinc nitrate 120-380 parts. This invention can be used in human bone implants, possessing antibacterial properties, strong binding ability to bone cells and tissues, and the ability to promote the regeneration and repair of bone cells and tissues, showing broad application prospects in the medical field.

The invention relates to a preparation method of an aperture-adjustable wet-process polyolefin microporous membrane, which comprises the following steps: blending polyolefin resin and a diluent to form a uniform suspension, carrying out melt extrusion on the suspension through a screw extruder to form a transparent melt sheet, annealing the transparent melt sheet, cooling to room temperature, and carrying out hot stretching to obtain the polyolefin microporous membrane. Compared with the prior art, the method has the advantages that liquid-liquid phase separation is carried out in the annealing process, the pore diameter is increased by utilizing mutual fusion of polymer lean phases, and the pore diameter is regulated and controlled by adjusting the phase separation time, so that the purpose of adjusting the pore diameter is achieved. Meanwhile, the crystallization time is prolonged, the cast sheet crystal structure is improved, and the mechanical strength of the membrane is also improved.

The invention belongs to the field of biological materials, and particularly discloses a cytoskeleton and leather prepared from the cytoskeleton, and the cytoskeleton is prepared by a preparation method comprising the following steps: mixing polysaccharide-containing hydrogel with a cross-linking agent solution to obtain a mixed solution; forming the mixed solution at 0-10 DEG C to obtain the cell scaffold, the temperature of the polysaccharide-containing hydrogel and / or the crosslinking agent solution is-40 DEG C to-10 DEG C. The preparation method of the cell scaffold is simple, efficient and wide in raw material source, complex equipment is not needed in the preparation process, and large-scale mass production can be achieved; according to the preparation method of the cell scaffold, the ice crystal pore-forming principle is utilized in the preparation process, a large number of through pore channels can be formed in the cell scaffold, no pore-forming agent needs to be used, and a series of problems caused by using the pore-forming agent can be avoided.

The application discloses a kind of solid supported copper-based N-heterocyclic carbene catalytic materials and preparation method and application thereof, and it is related to material synthesis technical field.The preparation method of the catalytic material includes: cuprous oxide is reacted with N-heterocyclic carbene ligand containing bromine group in solvent, and copper-based N-heterocyclic carbene complex is formed;The complex is subjected to Sonogashira coupling reaction with alkyne compound under the action of catalyst, and bromine group on the complex is coupled with alkyne compound and occurs copolymerization, forms porous organic polymer skeleton, and copper-based N-heterocyclic carbene complex is distributed in the skeleton, and solid supported copper-based catalytic material is obtained;Wherein alkyne compound is selected from 1,3,5-triethynylbenzene or 1,3,5-tri (4-ethynylphenyl) benzene.The obtained catalytic material has porous organic polymer skeleton, and copper active species is uniformly distributed in the whole material, belongs to heterogeneous catalytic material, is easy to separate and recycle, can be recycled, and shows excellent catalytic performance in alkyne alkylation reaction of trifluoromethyl ketone.

The utility model relates to a kind of fruit and vegetable juice extraction equipment, belong to fruit and vegetable juice processing technical field.The equipment aims at the problem of laborious and inconvenient cleaning of manual juice extraction, provides a kind of solution.Equipment includes base, fixed rod, juice barrel, fixed inclined block, detachable juice extraction assembly (including funnel box and metal filter box), extrusion assembly (including pressing handle, rotating plate, gland) and brake assembly.When using, fruit is placed, and pressing handle drives gland to extrude juice vertically by rotating plate structure, and juice flows out after filtering.When cleaning, brake assembly is operated to quickly remove the fixing of juice extraction assembly, and funnel box and metal filter box are conveniently taken out for cleaning.This way reduces the strength needed for operation, and makes disassembly and cleaning more convenient.

The invention discloses dsRNA and application thereof in preparation of a nano preparation for preventing and treating pepper phytophthora blight, and relates to the technical field of pepper phytophthora blight prevention and treatment. 1, and the dsRNA sequence is as shown in SEQ ID NO. 2; the dsRNA sequence is used for inhibiting the HK2 gene, and the nucleotide sequence is shown as SEQ ID NO.1. When the dsRNA is applied to preparation of the nano preparation MSNs-dsRNA for antagonizing phytophthora capsici and preventing and treating phytophthora capsici, expression of the HK2 gene can be inhibited in a targeted manner, and the MSNs-dsRNA nano preparation has high efficiency in prevention and treatment of phytophthora capsici infection induced phytophthora capsici infection induced phytophthora capsici infection induced phytophthora capsici infection induced phytophthora capsici infection induced phytophthora capsici infection induced phytophthora