50 results about "Thermal decomposition method" patented technology

The invention discloses a component gradient iridium tantalum coating anode and a preparation method thereof, the component gradient iridium tantalum coating anode comprises a titanium-based bottom layer, a middle layer and a surface active layer structure with component gradient, and the middle layer and the active layer are both prepared through a thermal decomposition method. And the intermediate layer is prepared on the titanium substrate and is composed of TiO2 / Ta2O5 mixed oxide. The surface active layer is prepared on the outer side of the middle layer and comprises a plurality of layers of IrO2 / Ta2O5 oxide coatings with different iridium-tantalum proportions. Compared with a traditional uniform coating anode, the prepared component gradient iridium tantalum coating anode can relieve the stress concentration phenomenon and reduce coating cracking, the service life of the anode is remarkably prolonged, and the catalytic activity of the anode is remarkably improved; the modified carbon nano tube is added into the active layer precursor solution, so that the conductivity change caused by component gradient is improved, and the cell voltage of the component gradient iridium tantalum coating anode is effectively reduced; and moreover, the iridium content is lower, and the preparation cost of the electrode is reduced.

The invention discloses a preparation method of a nuclear magnetic resonance imaging contrast agent based on surface hepatocyte targeting molecule modification ferroferric oxide nanoparticles, which comprises the following steps: synthesizing ferroferric oxide nanoparticles (Fe3O4 NPs) by a thermal decomposition method, and connecting the Fe3O4 NPs with a ligand dopamine-PEG2000-EOB carrying hepatocyte targeting molecules by a ligand exchange method to obtain the nuclear magnetic resonance imaging contrast agent. The nanoparticles Fe3O4-EOB-PEG capable of carrying out selective T2 nuclear magnetic resonance imaging on the hepatocytes are formed. The method is simple and easy to operate, the controllability of the preparation process is high, the biocompatibility of the obtained product is good, T2 signals of hepatocytes can be remarkably improved, the good early diagnosis effect on liver tumors is achieved, and wide application prospects are achieved.

The invention discloses iron oxide nanoparticles capable of responding to particle size change in a tumor microenvironment and a preparation method of the iron oxide nanoparticles, and belongs to the technical field of biomedical nano materials. The nano-particle comprises an iron oxide nano-crystal core with the particle size of 3-5nm and a tumor microenvironment response layer coating the surface of the iron oxide nano-crystal core. The response layer contains groups, such as disulfide bonds, enzyme digestion peptide fragments and the like, which can respond to acidic pH, high-concentration reduced glutathione or matrix metalloproteinase and other tumor characteristic stimuli to generate structural changes. In a tumor microenvironment, the hydration particle size of the nanoparticles can be directionally and controllably converted from 3-20 nm to 20-100 nm (or reversely). The preparation method mainly comprises two steps of preparing the core by a thermal decomposition method and modifying the surface response layer. The technical problems of insufficient tumor targeted enrichment capacity, limited imaging contrast and difficulty in balancing permeation and retention caused by fixed particle size of the existing iron oxide nanoparticles are solved, and the accuracy and efficiency of tumor diagnosis and treatment can be remarkably improved.

This invention discloses a rare-earth permanent magnet powder with a TbCu7 structure and its preparation method. The TbCu7 structured rare-earth permanent magnet powder has an Sm... 1‑a Zr a Fe 9‑y‑z‑r Co y Ti z D r M x The preparation method involves using ultrasonic spray thermal decomposition or chemical co-precipitation to prepare spherical composite oxides from soluble metal salts, followed by reduction treatment at a certain temperature, and finally, high-temperature heating to control the introduction of nitrogen or carbon elements into the unit cell. The resulting magnetic powder is predominantly composed of the SmFe9 phase, effectively controlling the Th2Zn content. 17 Sm2Fe 17 The generation of impurity phases is controlled by the process optimization of this invention, resulting in magnetic powder with controllable morphology and particle size, while reducing rare earth loss, which has significant industrial value.

The invention relates to a high-first-effect quick-charge type nitrogen and phosphorus co-doped hard carbon negative electrode material, a preparation method thereof and a sodium ion battery. The preparation method comprises the following steps: crushing biomass by using a crusher to obtain biomass powder; deionized water is adopted to wash the biomass powder, and then the washed biomass powder is dried at a first preset temperature for a first preset time; uniformly mixing the pretreated biomass powder, an activating agent and a nitrogen doping agent according to a preset mass ratio; placing the mixed material in a first tubular furnace in an inert gas atmosphere for carbonization and calcination; cooling the calcined product to room temperature, taking out the calcined product, transferring the calcined product into an acid solution, stirring and cleaning, repeatedly washing the calcined product with deionized water until the calcined product is neutral, and drying the calcined product in a drying oven at a second preset temperature for a second preset time; the mode of high-temperature nitriding presintering and vapor phase phosphorus deposition is adopted, and element distribution uncontrollability, namely uneven distribution, of a traditional co-pyrolysis method is broken through.

The invention relates to the field of photovoltaic power generation, and mainly relates to a Fe2O3 nanorod array perovskite solar cell and a preparation method thereof. The preparation method of the Fe2O3 nanorod array perovskite solar cell is provided for solving the problems that in the prior art, a physical coating technology is complex in process, high in cost and low in production efficiency. A Nb-TiO2 compact layer is prepared through a hydrolysis-pyrolysis method, a Fe2O3 nano array is prepared through a hydrothermal method, a CH3NH3PbI3-xBrx thin film is prepared through a continuous two-step deposition method, a hole transport layer is prepared through a deposition method, and the Fe2O3 nano rod array perovskite solar cell is prepared. The method is simple and environment-friendly in process, low in cost and high in production efficiency.

The embodiment of the invention discloses a Ni < x > Fe < 3-x > O < 4 >-coated SiO2-coated Ni < O > super-hydrophobic-self-cleaning aerogel coating and a preparation method thereof, relates to the technical field of functional materials, and aims to overcome the defects of an existing composite coating. The preparation method of the Ni < x > Fe < 3-x > O < 4 > (at) SiO2 (at) NiO super-hydrophobic-self-cleaning aerogel coating comprises the following steps: preparing a magnetic nanosphere core Ni < x > Fe < 3-x > O < 4 > through a solvothermal method; the preparation method comprises the following steps: preparing Ni < x > Fe < 3-x > O < 4 > (at) SiO2 core-shell nanoparticles through a Stber method and a deposition-thermal decomposition method; and mixing the Ni < x > Fe < 3-x > O < 4 > (at) SiO2 core-shell nanoparticles with methyltrimethoxysilane, performing acid-catalyzed hydrolytic polycondensation, coating the surface of a base material with the mixture, and performing a normal-pressure drying process to obtain the Ni < x > Fe < 3-x > O < 4 > (at) SiO2 (at) NiO super-hydrophobic-self-cleaning aerogel coating.

This invention belongs to the field of inorganic functional material preparation technology, and specifically relates to a method for preparing α-Fe₂O₃ nanopowder by salt-assisted ultrasonic spray pyrolysis. First, an auxiliary salt and a ferric salt are dissolved in deionized water and ultrasonically prepared to form a precursor solution with an iron concentration of 0.01–1 mol / L. Then, the precursor solution is atomized in an ultrasonic atomizer with an ultrasonic frequency of 1.7–3 MHz, and the resulting droplets are collected. After collection, the droplets are ultrasonicated, filtered, and dried to obtain α-Fe₂O₃ nanopowder. This invention, by adding an auxiliary salt as a high-temperature solvent, solves the problems of severe agglomeration, large particle size, and poor uniformity in powders prepared by spray pyrolysis. The α-Fe₂O₃ powder obtained by the above method not only has small particle size, good uniformity and dispersibility, but the added auxiliary salt can also be recycled and reused.

The invention discloses quasi-paramagnetic ferrite nanoparticles prepared through asynchronous dynamic time sequence thermal decomposition and a method. According to the method, a first group of precursors and a second group of precursors with specific thermal decomposition temperature difference are added at a time, and the temperature and time of a plurality of stages such as preheating, nucleation doping, shell doping and grain growth in a programmed heating process are accurately controlled, so that effective coupling of asynchronous decomposition of the precursors and directional doping of core-shell components is realized. The quasi-paramagnetic ferrite nanoparticles prepared by the method have an ultra-small size of 2-6 nanometers, a core-shell structure and high monodispersity, the core part of the quasi-paramagnetic ferrite nanoparticles is an ordered phase rich in a first group of precursor metals, and the shell part of the quasi-paramagnetic ferrite nanoparticles is a disordered phase rich in a second group of precursor metals. The nano-particles show remarkably improved magnetic resonance imaging T1 relaxation efficiency which is far better than that of existing similar contrast agents, and can be used for preparing efficient and safe magnetic resonance imaging T1 contrast agents.

The application discloses a method for electrochemically treating anaerobic fermentation biogas slurry of kitchen waste, mainly comprising the following steps: 1. removing organic matters in the anaerobic fermentation biogas slurry of kitchen waste by electrochemical oxidation, thereby reducing the ammonia nitrogen content and COD value of the biogas slurry; 2. reducing residual hypochlorite in the biogas slurry after electrochemical oxidation in step 1 into chloride ions by a thermal decomposition method, a photo decomposition method or a catalytic decomposition method; 3. constructing a capacitor by using a chloride ion adsorption material and a sodium ion embedded electrode material, and adsorbing sodium chloride in the biogas slurry in step 2 by the capacitor capacitive deionization method; 4. discharging the capacitor adsorbing sodium chloride in a sodium chloride storage tank to resolve the sodium chloride, and returning the capacitor to step 3 to adsorb sodium chloride again after discharging, and repeating the cycle for multiple times until the sodium chloride content in the biogas slurry reaches the discharge standard; compared with the mainstream treatment process of the current anaerobic fermentation biogas slurry of kitchen waste, the method can greatly reduce energy consumption.

The invention discloses a rare earth doped aluminate nanocrystal capable of emitting light in a near-infrared second region through ultrasonic excitation as well as a preparation method and application of the rare earth doped aluminate nanocrystal. The preparation method comprises the following steps: mixing an alkaline earth metal ion compound, an aluminum ion compound, a rare earth ion compound and a polydentate ligand in water for complex reaction to prepare a metal ion chelate precursor; performing high-temperature solid-phase thermal decomposition reaction on the metal ion chelate precursor, performing surface fat-soluble molecular modification in a thermal solvent, and performing surface hydrophilization modification by adopting an amphiphilic polymer to prepare the rare earth doped aluminate nanocrystal capable of emitting near-infrared second region by ultrasonic excitation. The rare earth doped aluminate nanocrystal is prepared by adopting an amorphous complex high-temperature solid-phase thermal decomposition method, the reaction condition is controllable, the operation is simple, the repeatability is good, the used reagent is cheap and easy to obtain, the rare earth doped aluminate nanocrystal has the property of ultrasonic excitation near-infrared second-region luminescence, and the wavelength can be adjusted within 900-2500 nm.

This invention proposes a novel inert titanium anode and its preparation method, belonging to the field of electrochemical technology. The novel inert titanium anode of this invention comprises a titanium substrate and an anode coating. The anode coating is loaded on the surface of the titanium substrate and has a layered structure containing three metal oxides: an inner layer of ruthenium oxide, a middle layer of iridium oxide, and an outer layer of tin oxide. Ruthenium and iridium are deposited sequentially on the surface of the titanium substrate using an electrodeposition method. Then, a tin-containing solution is sprayed onto the surface using a spraying process. Finally, a layered coating containing ruthenium, iridium, and tin oxides is generated in situ on the surface of the titanium substrate using a thermal decomposition method, resulting in the novel inert titanium anode. The novel inert titanium anode prepared by this invention exhibits good electrochemical performance and a long lifespan.

The application provides a chain pyrolysis device with transverse flexible wires and a pyrolysis method, relates to the technical field of pyrolysis, and comprises a closed shell, a chain transmission mechanism, a flexible reaction net, a plurality of flexible scrapers and a baffle; the chain transmission mechanism comprises a pair of parallel horizontally placed flat annular plate chains and driving and supporting components thereof, is divided into a reaction zone, a separation zone and a driving zone; the flexible reaction net comprises a plurality of pairs of fin rods which are arranged at intervals on the two plate chains and a plurality of parallel flexible wires which are connected to the fin rods on the two sides respectively; one end of the flexible scraper is fixed to the inner surface of the closed shell above the separation zone and the other end can contact the flexible reaction net. The application can directly and efficiently pyrolyze large-size strip-shaped organic waste, so as to solve the technical problems that the existing pyrolysis device is prone to softening, caking and blocking of raw materials, serious coking and slagging and high pretreatment cost when processing strip-shaped organic waste.

The invention discloses a preparation process of a cover plate direct writing grid line. The preparation process comprises the following steps: S1, arranging a composite embedded line composed of a core layer and a peelable outer layer on the surface of a cover plate base material; s2, carrying out calibration and pattern compensation on the position of the pre-embedded line by adopting a laser positioning system; s3, depositing a metal conductive layer; s4, removing the outer layer of the pre-embedded wire in a thermal decomposition mode to separate the core layer from the metal layer; s5, laser finishing and forming; s6, annealing treatment is conducted on the grid lines, and transparent passivation layers are deposited on the surfaces of the grid lines; through the steps of pre-embedded line structure compounding, laser positioning calibration, metal deposition and selective removal, laser finishing, post-treatment and the like, high-precision, high-efficiency, low-cost and environment-friendly grid line preparation is realized; the problems of complex flow, high material waste, serious environmental pollution and insufficient silk-screen printing precision of the traditional photoetching etching process are effectively solved.

The invention discloses a photovoltaic module dissociation method based on a freezing-cementing dual force transfer mechanism. The method comprises the following steps: firstly, cutting a module into small blocks and immersing the small blocks into a special seepage system; the seepage system is an oil-in-water type emulsion composed of silica sol, grease, a functional additive and a water phase, the content of the silica sol is 10-30 wt%, and the content of the grease is 5-15 wt%. Then, the soaked assembly block is subjected to at least one time of freezing and thawing cycle treatment, and the cycle comprises the steps that the assembly is cooled to 80 DEG C below zero to 25 DEG C below zero, and heat preservation is conducted; and then rapidly raising the temperature to 40-80 DEG C at a speed of 30-50 DEG C / min for thermal shock, and expanding cracks by using thermal mismatch stress. And finally, obtaining complete glass, a battery piece, a back plate and an EVA (Ethylene Vinyl Acetate) adhesive film through mechanical separation. Efficient and low-temperature dissociation of the assembly is achieved through the physical synergistic effect, the dissociation rate exceeds 90%, the problems of high energy consumption of a traditional pyrolysis method, toxicity of an organic solvent method and low value of a mechanical method are effectively solved, and the method has the advantages of being environmentally friendly, high in material recovery value and simple and convenient in process.

The invention discloses a nano chromium oxyfluoride catalyst as well as a preparation method and application thereof, and the catalyst is prepared by taking a chromium source as a precursor, taking small molecular organic acid, a cationic surfactant and a nonionic surfactant as templates, adding a fluorine source and adopting a template agent guiding-solid phase thermal decomposition method. The preparation method comprises the following steps: grinding and mixing a chromium source precursor, a fluorine source and a template agent, reacting the mixture at 100-200 DEG C for 6-48 hours, centrifugally washing the reactant, drying, and sufficiently roasting the dried product in a muffle furnace to obtain the nano chromium oxyfluoride catalyst. The prepared nano chromium oxyfluoride catalyst has extremely high selectivity and stability when applied to a reaction for preparing fluorine-containing olefins (HFOs) through gas-phase HF removal of hydrofluoroalkanes (HFCs), the catalytic selectivity reaches up to 100% (the selectivity of a cis-product Z-HFO-1225ye reaches up to 98%), the catalytic conversion rate reaches 85% or above, and the nano chromium oxyfluoride catalyst has the advantages of being high in conversion rate, high in selectivity, good in stability and suitable for industrial production. The cost is low, and the operation is simple.

The application relates to the technical field of magnetic particle imaging, and more particularly to an iron oxide nanoparticle and application of the iron oxide nanoparticle in magnetic particle imaging. The nanoparticle is an octahedral superparamagnetic ferroferric oxide nanoparticle, the nanoparticle is synthesized by adding a surfactant and controlling a reaction rate through a high-temperature thermal decomposition method, the surfactant includes oleic acid and oleylamine, the octahedral superparamagnetic ferroferric oxide nanoparticle is coated with an amphiphilic polymer, the amphiphilic polymer includes polymaleic anhydride-1-octadecenoic acid and polystyrene maleic anhydride copolymer, and the outer layer of the amphiphilic polymer includes biological membranes such as macrophage membranes, red blood cell membranes, neutrophil membranes and tumor cell membranes according to biological application requirements. The surface of the octahedral magnetic particle is a crystal face, the crystal face has low spin disorder and low anisotropy, so that the octahedral magnetic particle has the advantages of low coercivity and high initial magnetic susceptibility, and thus becomes a high-sensitivity magnetic particle imaging tracer.

The invention discloses rare earth permanent magnet powder with a TbCu7 structure and a preparation method of the rare earth permanent magnet powder. The rare earth permanent magnet powder with the TbCu7 structure comprises the following components: Sm < 1-a > Zr Fe < 9-y-z-r > Co < y > Ti < z > D < r > M < x >. The preparation method comprises the following steps: preparing a spherical composite oxide from soluble metal salt by using an ultrasonic spray pyrolysis method or a chemical coprecipitation method, then carrying out reduction treatment at a certain temperature, and finally controlling introduction of nitrogen or carbon elements into unit cells through high-temperature heating. In the prepared magnetic powder, the SmFe9 phase is used as the main phase, generation of the Sm2Fe17 impure phase of the Th2Zn17 type is effectively controlled, the morphology and the particle size of the obtained magnetic powder are controllable through process optimization, meanwhile, the rare earth loss is reduced, and important industrial value is achieved.

The invention discloses a preparation method of a high-stability titanium electrode, and relates to the technical field of titanium electrode preparation through a thermal decomposition method. The method comprises the following steps: S1, carrying out surface treatment on a titanium substrate; s2, preparing an iridium tantalum coating solution containing cysteine hydrochloride; and S3, uniformly coating a titanium substrate with the coating solution, sintering to form an active coating, and cooling to room temperature to obtain the coated titanium electrode. Compared with a traditional iridium tantalum system, the coating titanium electrode introduced with cysteine hydrochloride has the advantages that the coating structure can be optimized, and the coating stability can be improved. Cysteine hydrochloride has certain reducibility and can inhibit excessive oxidation of noble metal oxides to a certain extent, so that the coated titanium electrode with better stability and longer service life is obtained and is used for producing a copper foil anode.

The application relates to a preparation method of a composite hydrogen-induced color change film and relates to a preparation method of a color change film. In order to solve the problems of high cost and complex process of existing magnetron sputtering, plasma vapor deposition and other methods and equipment, sol and ZnO sol are prepared by adopting a sol-gel method; mixed sol is uniformly attached to the surface of a glass substrate by adopting a pulling and dipping method; and a composite hydrogen-induced color change film is prepared by adopting a thermal decomposition method and loading a catalyst. The application explores the optimal addition amount of ZnO and the optimal heat treatment temperature, and improves the response rate of the composite film to hydrogen. A catalyst loading method based on the thermal decomposition method is provided. The composite film has a fast response rate to hydrogen, good reversibility, obvious color difference before and after color change, can rapidly and accurately detect hydrogen leakage in the environment, and has a wide prospect in the field of hydrogen leakage detection. The application belongs to the technical field of hydrogen leakage detection.

The invention provides a rare earth doped Cs2NaErF6 at-CaF2 nanocrystalline luminescent material and a preparation method thereof, and belongs to the technical field of fluorescent nano materials. According to the invention, the core-shell structure nano material with Cs2NaErF6 as the core and CaF2 as the shell is successfully prepared for the first time. The method comprises the following steps: firstly, preparing a rare earth doped Cs2NaErF6 nanocrystal core by adopting a high-temperature coprecipitation method; then, calcium trifluoroacetate is used as a precursor, and a CaF2 shell layer grows on the surface of the precursor through a high-temperature thermal decomposition method; the technical problem that rare earth doped Cs2NaErF6 nanocrystals are difficult to coat is solved, the prepared core-shell material is uniform in morphology, good in dispersity and high in stability, the up-conversion luminescence intensity and the fluorescence lifetime of the core-shell material are remarkably improved compared with those of an uncoated core material, and the core-shell material has wide application prospects in the fields of biological imaging, display, anti-counterfeiting and the like.

The present application relates to a kind of crystalline cobalt antimonate coating titanium electrode and its preparation method.The electrode active coating component is crystalline CoSb2O6, and Co and Sb element are uniformly distributed in active coating.The electrode is without noble metal such as Ru and Ir, and cost is far lower than classic TiO2-RuO2 coating titanium electrode.The electrode can achieve good chlorine evolution activity under low chloride ion concentration, and chlorine evolution activity is slightly lower than TiO2-RuO2 electrode, and service life is superior to TiO2-RuO2 electrode.In the field of on-site electrochemical treatment of wastewater, it has wide application prospect.The present application also provides the preparation method of cobalt antimonate coating titanium electrode, precursor solution is prepared by ethylene glycol-citric acid sol-gel method, electrode is coated by dip-coating plating film method, and finally electrode is prepared by thermal decomposition method.The present application is simple in process, low in cost, and suitable for large-scale production.

The invention provides hydrophilic magnetic ferroferric oxide nanoparticles with controllable size and surface groups and a preparation method of the hydrophilic magnetic ferroferric oxide nanoparticles, and belongs to the technical field of biomedical materials. According to the preparation method, benzyl ether, a polyethylene glycol modifier and ferric acetylacetonate are used as raw materials, a hydrophilic ligand type high-temperature thermal decomposition method is adopted, ferroferric oxide nanoparticles with different particle sizes can be obtained by changing the heating rate, the nanoparticles do not need to be subjected to surface modification treatment or ligand replacement, and the ferroferric oxide nanoparticles have good hydrophilic performance; the stability in water is good; the surfaces of the magnetic ferroferric oxide nanoparticles prepared by the method provided by the invention have single modification groups, homodimodification groups or heterodimodification groups, and a convenient chemical modification approach is provided for subsequent application. In addition, fluorescent micromolecules AF647 NHS activated ester and BSA protein are respectively used as model drugs, and the feasibility of the hydrophilic magnetic ferroferric oxide nanoparticles as a micromolecule and biomacromolecule delivery carrier is verified.

The invention belongs to the technical field of preparation of photocatalytic nitrogen fixation materials, and particularly relates to a g-C3N4-N3C / NiS photocatalyst as well as a preparation method and application of the g-C3N4-N3C / NiS photocatalyst. The method comprises the following steps: dissolving g-C3N4 containing N3C vacancy in water, carrying out ultrasonic treatment, and then adding a nickel nitrate hexahydrate solution to obtain a mixed solution; and dissolving thiourea in water, uniformly mixing with the mixed solution, putting into a reaction kettle, heating to react, cooling to room temperature after the reaction is finished, separating, washing and drying to obtain the g-C3N4-N3C / NiS photocatalyst. The CN nanosheet containing the N3C vacancy is prepared through an in-situ thermal decomposition method, then the NiS nanosheet is modified on the CN-N3C-0.5 through an in-situ growth method, the photocatalyst containing the II-type heterojunction structure is successfully prepared, and the photocatalytic nitrogen fixation performance of CN can be effectively enhanced by introducing the N3C vacancy and NiS.

The invention relates to the technical field of tooth whitening, in particular to a spin-polarized sound-sensitive agent, a preparation method and application of the spin-polarized sound-sensitive agent in toothpaste. The spin-polarized sonosensitizer is synthesized by taking a titanium dioxide nanorod with a one-dimensional brookite structure as a substrate through a high-temperature thermal decomposition method, ferromagnetic elements are uniformly doped in the spin-polarized sonosensitizer in a monatomic form, and the ultrasonic catalytic activity is remarkably improved. When the spin-polarized sound-sensitive agent is added into toothpaste, active oxygen can be generated through ultrasonic driving, pigments on the surfaces of teeth can be efficiently degraded, and the spin-polarized sound-sensitive agent has no damage to enamel and is high in biological safety.

The application discloses a preparation method of nanocrystal@conductive polymer superlattice, and single-dispersed oleic acid-coated metal oxide nanocrystals are obtained through a thermal decomposition method; a polymerizable ligand exchange strategy is adopted to obtain oleic acid / polymerizable ligand co-coated colloidal nanocrystals; then solvent evaporation-induced assembly is carried out to obtain double-ligand co-coated nanocrystal superlattice; finally, an in-situ oxidation polymerization strategy is adopted to obtain nanocrystal@conductive polymer superlattice. The method has certain universality, and the doping level and type of the nanocrystal@conductive polymer superlattice can be controlled by changing the content and type of polymerizable monomers. Based on the characteristics of the nanocrystal@conductive polymer superlattice material, such as three-dimensional cross-linked polymer conductive network structure and highly ordered and densely packed active center, the application has wide application prospects in the fields of electrochemical energy storage and electrocatalysis.

The invention belongs to the technical field of medical contrast agents, and discloses a preparation method of a superfine gadolinium oxide T1-MRI contrast agent, which comprises the following steps: S1, preparing hydrophobic gadolinium oxide nanoparticles Gd2O3-OA with stable surface oleic acid by adopting a high-temperature thermal decomposition method; s2, the Gd2O3-OA and gallic acid are subjected to a reaction, and Gd2O3-GA nano particles are obtained; and S3, carrying out a reaction on the Gd2O3-GA and citric acid under an alkaline condition to obtain the ultrafine gadolinium oxide nanoparticles Gd2O3-CA modified by the citric acid. The Gd2O3-CA nano-particles prepared by the method in the scheme are uniform in particle size and superfine in particle size, and have better water dispersibility and stability. The nanoparticles have higher longitudinal relaxation rate and better in-vivo radiography effect, and can realize rapid removal through kidney metabolism at the same time, so that the risk of gadolinium ion deposition is reduced.

This invention relates to a method for enhancing the lifespan of coated titanium electrodes using a polymer-modified coating solution. Compared to electrodes prepared with conventional coating solutions without polymer modification, the electrode coating prepared with the polymer-modified solution exhibits a 20-50% reduction in crack size, a 0.8-2.4-fold increase in accelerated life testing lifespan, and a 1-2.5-fold increase in lifespan during frequent reverse electrolysis of tap water. The polymer-modified coating solution method is applicable to coated titanium electrodes with various active coatings, including but not limited to RuO2-TiO2 coatings, RuO2-TiO2-IrO2 coatings, RuO2-TiO2-SnO2 coatings, and IrO2-Ta2O5 coatings. Furthermore, the polymer-modified coating solution method is compatible with existing industrial electrode manufacturing processes, namely the surface coating thermal decomposition process, and is easily scaled up for production.

The application discloses a kind of loaded manganese doped ceria nanoscale enzyme's Pachyman hydrogel and its preparation method and application, it is related to biomedical technical field.The preparation method is first prepared by high-temperature thermal decomposition method fat-soluble manganese doped ceria nanoscale enzyme, then it is surface-modified using distearoyl phosphatidyl ethanolamine to obtain water-soluble nanoscale enzyme;Polyvinyl alcohol solution is mixed uniformly with Pachyman powder, water-soluble nanoscale enzyme, borax solution is added to crosslink and form hydrogel, after freeze-room temperature processing alternately, it is obtained.The energy storage modulus of the prepared hydrogel is 120-350 Pa at pH 6.5-7.2, 37 ℃, and the adhesion is greater than or equal to 8.5 kPa.The hydrogel prepared by the application has good biocompatibility, can efficiently remove active oxygen, relieve intestinal oxidative stress, and has suitable adhesion and degradation characteristics, can be administered by enema, and be used for preparing drugs for treating irritable bowel syndrome.

The invention discloses a method for preparing pure beta-phase molybdenum carbide particles through one-step carbonization and application of the pure beta-phase molybdenum carbide particles. The preparation method comprises the following steps: (1) preparing molybdenum oxide powder by adopting a method for thermally decomposing a molybdenum metal compound; (2) dividing an organic matter precursor and the molybdenum oxide powder obtained in the step (1) into two stacks, and respectively placing the two stacks on the ventilation side and the exhaust side of a tubular furnace; and (3) introducing carrier gas into the tubular furnace, and carbonizing the molybdenum oxide powder through a temperature programming process. According to the method, the carrier gas is utilized to deliver the gas-phase carbon source produced by thermal decomposition of the organic matter precursor to directly react with the solid-phase molybdenum oxide powder, the carbonization process can be efficiently achieved, high-purity beta-phase molybdenum carbide is obtained through one-step carbonization, high-value and high-risk hydrocarbon gas such as methane and propyl alcohol or alcohol steam is avoided, and the method is suitable for industrial production. The problems of carbon deposition on the surface of the molybdenum carbide caused by using the carrier gas as a carbon source and the like can be avoided, and the preparation method is simple, relatively mild in reaction condition, low in raw material cost, simple and easy to obtain and suitable for large-scale production, popularization and application.