702results about How to "Uniform size" patented technology

The invention relates to a stem cell bioactive nano-vesicle with efficient inflammation regulation and tissue repair effects, the average particle size of the nano-vesicle is 100-350nm, the polydispersity index (PDI) is 0.05-0.40, and the expression rate of phosphatidylserine (PS) on the surface of the nano-vesicle is greater than 40%. According to the preparation method, stem cells are subjected to apoptosis induction, and then a programmed serial extrusion process is adopted to prepare the nano-vesicles. The nano vesicles are moderate in particle size, uniform in distribution and high in production efficiency, the preparation process is easy to operate, the quality is stable and controllable, and the nano vesicles have excellent technical effects in the aspects of repair and regeneration of inflammation injury type tissues and organs.

The invention discloses a preparation method and application of a zinc-manganese bimetal organic framework derived composite nano-enzyme, and belongs to the technical field of nano-materials. Zinc-manganese bimetal organic framework nanoparticles prepared by reacting ZIF-8 with manganese (III) acetylacetonate are used as a template, and are calcined at different temperatures in a tubular furnace to obtain zinc-manganese bimetal organic framework derivative composite nano-enzymes with different morphologies. The nano enzyme has peroxidase-like activity, glutathione peroxidase-like activity and catalase-like activity, and has a wide application prospect in anti-tumor treatment.

The invention discloses a method for maintaining DC equalization of a high-voltage cascade energy storage system by using grounding switch backflow, and the method comprises the steps: collecting the data of a battery cell in a battery cluster in real time through a battery management system, carrying out the statistics of the voltage and current data of a battery cluster end, and uploading the data to a system main controller for calculation; the system main controller judges the state of each phase when the current is balanced according to the current battery data statistical state of each phase, and controls the on-off state of the MOSFET in each power module in the corresponding state; after the total charging or discharging current of each phase of battery cluster is determined, the cluster controller of each battery cluster controls the duty ratio of the MOSFET according to the current state of each battery PACK; and after the battery PACK receives the duty ratio parameter issued by the cluster controller, the output waveform of the MOSFET is modulated, and finally multi-level current equalization is realized. According to the invention, the duty ratio of the power module is controlled by applying a strategy, and the magnitude of equalization current between PACKs is controlled, so that multi-stage SOC equalization of the PACKs, clusters, bridge arms and phases is realized.

The invention discloses a method for preparing high-purity uranium carbide microspheres by a microfluidic-assisted internal gelation process, which comprises the following steps of: designing a uranium glue solution component containing carbon black to obtain a uranium glue solution which is stable for a long time at room temperature and quickly gelates at high temperature; the preparation method comprises the following steps: preparing gel microspheres with uniform size by using a uranium glue solution as a micro-fluidic dispersion phase through a micro-fluidic assisted inner gel process; the pore structure in the gel microspheres is maintained through washing and soaking with propylene glycol monomethyl ether, so that the crack-free gel microspheres are obtained; the UC nuclear fuel microspheres which are uniform in size, good in sphericity degree and high in phase purity are prepared through the carbon thermal reduction reaction of the non-cracking gel microspheres under the optimized sintering schedule, and development of ultrahigh-temperature gas cooled reactor nuclear fuel is expected to be promoted.

The organosilicon-polyurethane foam encapsulating material is composed of a component A and a component B. The component A comprises sucrose initial polyether polyol, sorbitol initial polyether polyol, a water-containing alcohol amine foaming agent, a catalyst and a halogen-free flame retardant, and the component B comprises an NCO-terminated polysiloxane-polyurethane prepolymer, silicone oil and a diluent. Wherein the water-containing alcohol amine foaming agent comprises isopropyl alcohol di-sec-butyl alcohol amine, a mixture of isopropyl alcohol sec-butyl alcohol amine and water. The two-component encapsulating material is used for encapsulating a new energy battery module.

The invention belongs to the field of new energy materials and devices, and particularly discloses nitrogen self-doped phenolic resin-based hard carbon microspheres and a preparation method and application thereof.The preparation method comprises the following steps that nitrogen-containing phenol monomers, aldehyde monomers and a basic catalyst are mixed according to a certain sequence, and after prepolymerization is conducted at the low temperature, the nitrogen self-doped phenolic resin-based hard carbon microspheres are obtained; carrying out high-temperature hydrothermal reaction to obtain phenolic resin microspheres; and sequentially carrying out low-temperature carbonization treatment and high-temperature carbonization treatment to obtain the nitrogen self-doped phenolic resin-based hard carbon microspheres. Compared with the existing nitrogen-doped resin hard carbon preparation method, the nitrogen-self-doped phenolic resin hard carbon has the advantages that a nitrogen source is introduced into the phenolic resin hard carbon from the source end of the resin, the production process is simplified, and uniform distribution and atomic-scale doping of the nitrogen element are realized. The material is used for sodium ion batteries, has excellent long cycle stability, good rate capability and high specific capacity, and has industrial application prospects.

The invention discloses nano rare earth oxide-containing titanium-based composite powder for 3D printing. The nano rare earth oxide-containing titanium-based composite powder comprises the following components in percentage by mass: 5.0%-7.0% of aluminum, 1.0%-3.0% of tin, 3.0%-5.0% of zirconium, 0.1%-3.0% of molybdenum, 0.2%-1.0% of silicon, 1.0%-3.0% of rare earth elements, 0.01%-0.05% of boron, 0.1%-0.5% of oxygen and the balance of titanium. The invention further discloses a preparation method of the titanium-based composite powder, according to the method, a vertical ingot pulling technology is adopted, so that the defects such as inclusions and air holes in a melt are reduced, meanwhile, the size and distribution of rare earth oxide are uniform, and then nano-scale rare earth oxide particles are uniformly dispersed and separated out through rapid solidification. The nano-particles are not prone to causing stress concentration while hindering dislocation slippage, and coordination matching of the obdurability of the titanium-based composite material is expected to be further improved.

The invention relates to the technical field of catalysts, and provides a supported sulfonated phenolic resin solid acid catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out hydrophobic modification on the surface of a carrier by adopting a silane coupling agent to obtain a modified carrier; then carrying out polymerization in-situ growth on soluble phenolic resin and a curing agent on the modified carrier to obtain a phenolic resin-loaded modified carrier; the preparation method of the supported sulfonated phenolic resin solid acid catalyst provided by the invention has the advantages that the process is simple, the cost is low, and the utilization rate of phenolic resin is high; the prepared catalyst is uniform in size, high in mechanical strength, not easy to crush, small in resistance and good in stability during liquid-phase flow catalytic continuous reaction, has good catalytic activity and high isosorbide yield when being used for catalyzing dehydration of sorbitol to prepare isosorbide, and can be recycled.

The invention discloses a boron manganese tannate nanoparticle as well as a synthesis method and application thereof. The synthesis method of the tannic acid boron manganese nanoparticles comprises the following steps: sequentially dropwise adding a bivalent manganese salt solution, a boric acid solution, a polyethylene glycol solution and a bovine serum albumin solution into pure water under water bath ultrasonic or magnetic stirring to obtain an assembly stock solution, and adding a tannic acid solution into the assembly stock solution to initiate assembly; and continuously carrying out water-bath ultrasonic treatment or magnetic stirring for a period of time, and then carrying out ultrafiltration to remove free drug molecules, so as to obtain the boron manganese tannate nanoparticles capable of mediating boron neutron capture therapy and magnetic resonance imaging. The boron manganese tannate nanoparticles can improve the boron intake in tumors and prolong the retention time of boron atoms in the tumors in boron neutron capture therapy, drug distribution is monitored through the nuclear magnetic resonance imaging technology, then the treatment effect of the boron neutron capture therapy is improved, the preparation method is simple, the stability is good, the size is uniform, the boron loading amount is high, and the application prospect is wide. The biological safety is good, and the repeatability is high.

The invention discloses micro-chemical continuous synthesis equipment and preparation method of nano barium sulfate / barium carbonate, and the micro-chemical continuous synthesis equipment comprises a support frame for bearing the whole equipment; the outer shell is fixed on the support frame, and a plurality of annularly distributed arc-shaped openings are formed in the lower part of the outer shell; the top of the inner shell is fixedly connected with the top of the outer shell, and the lower portion of the inner shell is provided with an adjusting arc opening corresponding to the arc opening. The rotary adjusting assembly is rotationally arranged between the outer shell and the inner shell; the continuous phase conveying device is fixedly arranged in the center of the upper part of the inner shell; the dispersed phase conveying device is fixed in the center of the lower part of the inner shell; the adjusting conveying device corresponds to the arc-shaped opening in the outer shell and is fixed on the outer side of the dispersed phase conveying device; and the collecting assembly is fixed at the bottom of the dispersed phase conveying device and corresponds to the inner shell and the outer shell. According to the invention, controllable growth of crystal grains can be realized, the product size is uniform, the nanocrystallization degree is high, and supporting facilities such as front-end pretreatment and rear-end filtering and drying of a traditional process can be coupled.

The invention relates to the technical field of phase change materials, and discloses a multifunctional composite phase change material and a preparation method and application thereof. The phase change energy storage microcapsule is prepared from the following raw materials: a core material, a Pickering emulsion template and a wall material, the wall material comprises resin and polypyrrole. The multifunctional composite phase change material is prepared from the phase change energy storage microcapsule, a reinforcing material and a polymer elastomer. The phase change energy storage microcapsule provided by the invention is uniform in size, regular in shape, good in stability and good in coating effect, the surface is doubly coated with the resin and the polypyrrole nanoparticles, the phase change material leakage condition is avoided, and the thermal cycling stability is good; the multifunctional composite phase change material has good photo-thermal conversion capability and conductivity and good thermal cycling stability, can meet the multi-scene application requirements in the fields of intelligent wearing, solar energy conversion and human body near-infrared photo-thermal treatment, and is non-powdery and can be directly used.

The invention discloses a nitrogen-containing chain compound, a preparation method, a composition containing the nitrogen-containing chain compound and application of the nitrogen-containing chain compound. The invention specifically discloses a compound I or a pharmaceutically acceptable salt thereof. The LNP preparation prepared from the nitrogen-containing chain compound is relatively uniform in nanoparticle size, relatively high in encapsulation efficiency and relatively high in in-vivo expression activity. # imgabs0 #

The invention discloses a cream conveying device with an adjusting function and a conveying method of the cream conveying device, and relates to the technical field of feeding equipment. The gearbox is fixedly arranged on the top side of the bottom plate of the rack, the right end of the gearbox is fixedly provided with a driving motor with a driving function through a bolt, the fixed-length assembly is arranged in the conveying barrel, transmission pressure adjustment is achieved, the influence of shearing force on the quality of the conveying barrel is avoided as much as possible, and meanwhile cream transmission data can be collected and calculated; the size and distribution of fat globules are controlled to be more uniform, and the influence on the whipping rate and the cream quality is reduced; the pressing assembly is arranged on the top side of the feeding cylinder, so that fat globules in the single cream guided out by the micro spray head with a fine flow channel can be better stably and uniformly distributed while the single cream is sterilized; by arranging the steam generator and the air compressor, steam is guided into the feeding cylinder, the conveying cylinder and other components through cleaning particles arranged in the multi-way valve assembly for cleaning.

The invention relates to the technical field of integrated circuit chip packaging, in particular to an integrated circuit chip processing and packaging device and a packaging method thereof. Comprising a workbench, two sets of sliding grooves are symmetrically formed in the workbench, a first threaded rod is rotationally connected into one set of sliding grooves, and the first threaded rod is in transmission connection with a glue sealing assembly; the workbench is fixedly connected with a glue guide mechanism; the glue sealing assembly comprises two sets of movable supports, a second threaded rod is rotationally connected between the two sets of movable supports, and the second threaded rod is in threaded connection with a glue outlet mechanism. A plurality of integrated circuit chips are placed on a slide holder, clamping of the slide holder and a glue guide mechanism is completed, the integrated circuit chips are fixed in a glue injection space, and a first threaded rod and a second threaded rod drive a glue outlet mechanism to perform transverse and longitudinal intermittent movable glue injection until glue injection operation on all the integrated circuit chips is completed.

The invention relates to the technical field of inorganic non-metallic materials, in particular to an onion carbon preparation method based on a metal organic framework and onion carbon. The preparation method comprises the following steps: S1, synthesizing a metal organic framework precursor; s2, preliminary pyrolysis of the metal organic framework precursor; s3, etching and decomposing the formed metal particles; and S4, carrying out secondary pyrolysis on the primary pyrolytic carbon material. The carbon diameter of the prepared onion is 5-20 nm, and the carbon layer spacing is 0.34 nm. According to the preparation method, a metal organic framework is taken as a precursor, a two-step pyrolysis method is adopted, the precursor is carbonized at high temperature, a carbon material is etched again by ammonia gas and other gases released by thermal decomposition of melamine, and under the action, graphene is rearranged in the form of the same sphere center layer to form onion carbon particles with uniform sizes. The temperature and the reaction time in the preparation process can be accurately controlled, the preparation process is simple, the cost is low, the prepared onion carbon has relatively high purity and uniformity, and the oxygen reduction catalytic activity can be improved.

The invention discloses a SnO2 modified WO3 nanosheet composite gas-sensitive material as well as a preparation method and application thereof, and belongs to the technical field of inorganic composite materials. The preparation method comprises the following steps: dissolving WCl6 in ethanol, adding into a reaction kettle provided with a ceramic tube, carrying out hydrothermal reaction at 170-190 DEG C for 5-8 hours, taking out the ceramic tube, drying, and annealing to obtain a ceramic tube loaded with WO3 nanosheets; the preparation method comprises the following steps: dissolving SnO2, tin chloride and urea in water to obtain a mixed solution, adding the mixed solution into a reaction kettle filled with a ceramic tube loaded with a WO3 nanosheet, carrying out a hydrothermal reaction at 90-100 DEG C for 1-4 hours, taking out the ceramic tube after the reaction is finished, and drying to obtain the SnO2 modified WO3 nanosheet composite gas sensitive material, and enabling the SnO2 modified WO3 nanosheet to grow on the ceramic tube in situ. The preparation method is simple, the product is high in crystallinity and good in stability and is suitable for preparing a gas sensitive sensor material with high economical efficiency, and a sensor prepared from the SnO2 modified WO3 nanosheet composite gas sensitive material can effectively improve the gas sensitive performance of WO3 and shows an extremely high response value to nitrogen dioxide at a low temperature.

The invention discloses a bimetallic MOFs mediated morphology-controllable catalyst, a preparation method and application thereof, and the preparation method comprises the following steps: respectively adding an iron salt, a cobalt salt and an organic ligand into an organic solvent, and then adding an alkaline regulator and a surfactant; transferring the stirred solution into a reaction kettle to carry out solvothermal reaction, and centrifuging, washing and drying the suspension after the reaction to obtain a bimetal organic framework (MOFs) precursor; and carrying out heat treatment in a gas atmosphere to obtain the catalyst. The bimetallic MOFs are obtained through a one-step solvothermal method, the size and morphology of the product are regulated through the alkaline regulator, agglomeration of catalyst nanoparticles can be reduced by adding the surfactant, the preparation method is simple, the specific surface area of the product is high, and when the catalyst is used for preparing high-carbon hydrocarbon through catalytic hydrogenation of carbon dioxide, the yield of the product is high. The conversion rate of carbon dioxide reaches up to 47.82%, the selectivity of high-carbon hydrocarbon reaches 59.68%, the selectivity of by-products carbon monoxide and methane is low, and the catalytic activity is good.

The invention relates to a montmorillonite-probiotic microsphere preparation as well as a preparation method and application thereof, the microsphere preparation comprises montmorillonite, a probiotic biofilm and functional small molecules, and microspheres of the microsphere preparation are prepared by crosslinking sodium alginate in a collection solution based on a microfluidic technology. The microsphere preparation is mainly used for oral delivery of montmorillonite-probiotic biofilms and functional small molecules, so as to treat intestinal diseases. Compared with the prior art, the microsphere preparation provided by the invention has the advantages of gastric acid invasion resistance, intestinal responsive release and the like, and can effectively treat intestinal inflammation. In addition, the probiotic biofilm wrapped by the microspheres can enhance the interaction with the intestinal mucosa and prolong the residence time in the intestinal tract. Meanwhile, the used functional small molecules have excellent anti-inflammatory and intestinal barrier repairing effects, and can cooperate with the probiotics to regulate and control intestinal flora, so that the intestinal health is further improved.

The invention relates to a preparation method of a zinc nanowire. The preparation method comprises the following steps: mixing a solvent, a zinc precursor and an optional surfactant to obtain a solution 1; mixing a solvent and a catalyst to obtain a solution 2; and mixing the solution 1 and the solution 2 to obtain a solution 3, and heating to enable the zinc precursor to be subjected to decomposition reaction to obtain the zinc nanowire. The preparation method of the zinc nanowire is a solvothermal method, the zinc nanowire can be stably and efficiently prepared, the synthesized zinc nanowire is uniform in size, the length of the synthesized zinc nanowire can exceed 20 microns, the synthesized zinc nanowire is of a single-crystal structure, and the conversion rate of the synthesized zinc nanowire can reach 70%.

The invention belongs to the technical field of high-molecular flame retardants, and relates to a method for preparing spherical aluminum hypophosphite with a rough surface at low temperature and normal pressure, which comprises the following steps: adding aluminum sulfate hexahydrate into deionized water for dissolving according to a certain molar ratio, adding sodium hypophosphite monohydrate into deionized water and ethylene glycol for dissolving, and stirring under the condition of mechanical stirring to obtain spherical aluminum hypophosphite; the preparation method comprises the following steps: dropwise adding an aluminum sulfate hexahydrate aqueous solution into a sodium hypophosphite monohydrate solution at a relatively low temperature to obtain a mixed solution, heating in a water bath to 90 DEG C, reacting with the mixed solution to generate aluminum hypophosphite, washing the prepared aluminum hypophosphite slurry with deionized water and absolute ethyl alcohol in sequence, centrifuging, drying in vacuum, and grinding to obtain the spherical aluminum hypophosphite. Under general double decomposition reaction conditions, the spherical aluminum hypophosphite is synthesized at low temperature and normal pressure by controlling the dropwise adding temperature of the raw materials and adopting water and ethylene glycol as a mixed solvent. The prepared aluminum hypophosphite is excellent in morphology, narrow in particle size distribution and good in dispersity.

The present invention provides a kind of spherical gold powder and preparation method thereof, relate to the technical field of precious metal powder preparation, the preparation method uses aqua regia to prepare chloroauric acid solution, and uses concentrated hydrochloric acid to adjust pH to 1.5-2, then adds ammonia water to adjust pH to 7-9, stirs 20-60s, then adds concentrated hydrochloric acid to adjust pH to 1.2-2 again, obtains mixed solution B;Then, the first dispersant solution is poured into the aforementioned mixed solution B, after stirring evenly, the mixed solution A of the second dispersant and the reducing agent is quickly added, after stirring reaction, sedimentation, post-treatment, obtains spherical gold powder. Wherein, spherical gold powder of different sizes with a particle size within the range of 0.3-4 μm can be prepared by adjusting pH twice, and adding two different dispersants in a specific order of addition can make the prepared spherical gold powder uniform in particle size, good in dispersibility, regular in shape and smooth in surface. The preparation method reacts rapidly, the process is short and stable, and it has been stably expanded to 500g, which can realize large-scale industrial production.

The utility model discloses a high-pressure microcapsule filling machine and relates to the technical field of microcapsule forming devices. A positive electrode connecting wire and a negative electrode connecting wire are arranged on one side of the high-voltage generator; a measuring cup and a magnetic stirrer are arranged on the bottom frame; the magnetic stirrer is arranged at the bottom of the measuring cup; a fixed block is arranged on the bottom frame, a fixed rod is arranged on the fixed block, and a movable block is arranged on the fixed rod in a sliding fit manner. An injector is placed between the arc-shaped plates on the two sides, a needle at the bottom of the injector penetrates through the placing ring to press the injector downwards, the arc-shaped plates are driven by the connecting frames on the two sides to clamp and fix the injector, and injectors of different specifications can be clamped and fixed. Under the action of extrusion of the propeller on the push rod of the injector and electric field force, the solution in the injector drips into the solution in the measuring cup, so that microcapsules with different particle sizes can be selectively prepared according to liquid components, the magnetic stirrer can be dispersed in the generated microcapsule particles in the measuring cup, and finally the microcapsule particles with uniform size and uniform particle size can be formed. The microcapsule is spherical and has a smooth surface.

The invention discloses a high-entropy multiple silicon-carbon functional material and a preparation method thereof, a negative pole piece and a lithium ion battery. The high-entropy multiple silicon-carbon functional material is a composite negative pole material formed by compounding an oxygen-enriched high-entropy oxide, multiple carbon gel and nano silicon; in the high-entropy multiple silicon carbon functional material, the high-entropy oxide material is coated with multiple carbon gel to form a composite material, and the composite material is also loaded with nano silicon particles. The high-entropy multi-silicon-carbon functional material is applied to manufacturing of the lithium ion battery, and the high-entropy material has a specific multi-element synergistic effect, a large number of active sites and structural stability, so that the silicon-carbon negative electrode is further optimized, and the energy density and the electrochemical performance of a battery cell in the lithium ion battery can be obviously improved.

The invention discloses an iron-based bimetallic catalyst as well as a preparation method and a use method thereof. The iron-based bimetallic catalyst comprises an active metal; the composite carrier comprises zirconium oxide, a zirconium-based organic framework and an iron-based organic framework, the zirconium-based organic framework is coated with the iron-based organic framework, and iron and the active metal are loaded on the zirconium oxide. The preparation method comprises the following steps: mixing zirconium nitrate pentahydrate and a first organic ligand for reaction to obtain a zirconium-based organic framework material; mixing the zirconium-based organic framework material, a second organic ligand and a metal salt for reaction to prepare a composite organic framework material; calcining the composite organic framework material, and soaking the calcined composite organic framework material in a metal salt solution; and carrying out drying treatment to obtain the iron-based bimetallic catalyst. The iron-based bimetallic catalyst is used for the catalytic reaction of carbon dioxide hydrogenation to generate low-carbon olefins.

The invention discloses a preparation method of a carbon fiber cloth coated SixFe1-xO2 nanorod material, which comprises the following steps: dissolving a silicon source and an iron source in a mixed solution of ethanol and ethylene glycol, adding hexamethylenetetramine and urea step by step, stirring and dissolving to obtain a mixed solution, then putting the mixed solution and carbon fiber cloth into a high-pressure reaction kettle together, and stirring for 30-60 minutes to obtain the carbon fiber cloth coated SixFe1-xO2 nanorod material. The preparation method comprises the following steps: adding a carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material into a reaction kettle, reacting at a certain temperature in a constant-temperature drying box, then naturally cooling to room temperature, washing and drying to obtain the carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material, putting the carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material into a muffle furnace, and annealing in an air environment to obtain the carbon fiber cloth coated SixFe1 The synthesis process is simple, the cost is low, the requirement for equipment is low, the controllable degree is high, and the obtained product is uniform and novel in morphology, has high charging and discharging capacity and long cycle life as a flexible negative electrode material, and has wide application in the fields of flexible batteries, photoelectric devices and the like.

The invention discloses a coal crushing device for safe sampling of pulverized coal, and relates to the technical field of coal crushing. The device comprises a supporting assembly, a powder tank is arranged in the supporting assembly in a penetrating mode, a funnel is arranged at the top of the powder tank and communicated with the interior of the powder tank, a stabilizing plate is arranged in the supporting assembly and located below the interior of the powder tank, a spiral sampling assembly is arranged on the right side of the powder tank, and a sampling pipe is arranged at the bottom of the spiral sampling assembly; a particle preventing device is arranged in the powder tank, an anti-bonding device is arranged below the particle preventing device, and an anti-erosion device is arranged on the inner side of the anti-bonding device. In the coal crushing process, the movement range of the crushing assembly is continuously changed, the phenomenon that part of coal is indirectly not in contact with the crushing assembly due to traditional static crushing machining is distinguished, and the phenomenon that coal powder is uneven in size due to different coal crushing frequencies is avoided.

The invention relates to the technical field of nano powder material preparation, in particular to a method for preparing molybdenum powder based on a spray granulation precursor and the molybdenum powder. The method for preparing the molybdenum powder comprises the steps that ammonium molybdate and a pore forming agent are dissolved in ultrapure water at the room temperature, and mixed slurry is obtained; carrying out spray granulation treatment on the mixed slurry to obtain composite powder particles containing the pore-forming agent and ammonium molybdate; the composite powder particles are placed in an oxygen-containing atmosphere to be roasted, and superfine nano molybdenum trioxide is obtained; placing the superfine nano molybdenum trioxide in a hydrogen atmosphere for primary reduction treatment to obtain superfine molybdenum dioxide powder; and the superfine molybdenum dioxide powder is subjected to second-stage reduction treatment, the superfine molybdenum powder is obtained, and the reduction conditions of the first-stage reduction treatment and the second-stage reduction treatment are different. According to the preparation method, the superfine molybdenum powder with good uniformity and dispersity can be prepared.

The invention relates to the technical field of lithium ion battery positive electrode materials, in particular to a composite phosphate positive electrode material and a preparation method and application thereof. The provided composite phosphate positive electrode material comprises a phosphate positive electrode material core and a carbon coating layer, the particle size of the composite phosphate positive electrode material is in normal distribution, the thickness of the carbon coating layer is 2.0-3.0 nm, and the variance is 0.01-0.30. The obtained finished product is relatively large in particle size and uniform in particle size, and the compaction density is remarkably improved; moreover, the surface of the core material is uniformly coated with the carbon coating layer, and the thickness of the carbon coating layer is moderate, so that not only can the electronic conductivity of the positive electrode material be improved, but also the discharge capacity, coulombic efficiency and other electrochemical properties of the composite phosphate positive electrode material can be improved.

The invention discloses a nitrogen-containing chain compound, a preparation method, a composition containing the nitrogen-containing chain compound and application, and particularly provides the nitrogen-containing chain compound as shown in the formula I or pharmaceutically acceptable salt of the nitrogen-containing chain compound. An LNP preparation prepared from the nitrogen-containing chain compound is relatively uniform in nanoparticle size, high in encapsulation efficiency and good in stability. The in-vivo expression activity is relatively high. # imgabs0 #

The present application discloses a bimetallic element doped silicon dioxide composite nanomaterial and its preparation method and application. The composite nanomaterial comprises a metal element and silicon dioxide with a hollow shell structure; the metal element is selected from at least two of zinc, cobalt, nickel, manganese, copper or iron; the internal cavity size is 50 to 500 nm; the specific surface area is 500 to 1000 m 2 / g, pore volume is 1.2~2.0cm 3 / g. The process of this application is simple, and the removal of the template and the construction of a complex hollow mesoporous structure are achieved at the same time. The rich and ordered metal composition and unique coordination instability of the coordination polymer are used as a metal source and a structure-guided template to form an internal cavity and dope metal elements at the same time. The material has a regular morphology, uniform size, good dispersion, single / double shell and hollow structure, high specific surface area and large pore volume, and has good application prospects in catalysis, energy utilization and conversion.