44 results about "Ceo2 nanoparticles" patented technology

The invention belongs to the technical field of metal anticorrosive coating materials, and particularly relates to a super-hydrophobic composite coating and a preparation method thereof. According to the invention, MoS2 is used as a skeleton, CeO2 nanoparticles are uniformly loaded on the surface of a MoS2 two-dimensional layered structure, polydopamine is used as a connecting agent to form a stable Ce-MoS2 composite filler, and an active and passive protective layer with the Ce-MoS2 composite filler is constructed on the surface of a matrix and is used as a bottom layer. And then, forming a hydrophobic coating containing modified SiO2 on the bottom layer to serve as a surface layer, so as to obtain the super-hydrophobic composite coating with double protection mechanisms. According to the coating, the active corrosion inhibition function of CeO2 and the physical shielding effect of MoS2 are combined, meanwhile, hydrophobic SiO2 nano-particles are introduced into the surface layer, the hydrophobic performance of the surface is further enhanced, and therefore the technical problems that a traditional coating is prone to corrosion at the defect position and a corrosive medium is prone to permeation, and consequently the protection effect is remarkably reduced are effectively solved.

The invention relates to a WO-NiSe CeO2 self-supporting heterostructure catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing Ni LDH at CeO2 on foamed nickel through a hydrothermal method, then realizing high-valence tungstate radical doping through impregnation exchange, and finally carrying out secondary hydrothermal selenylation to obtain a porous nanosheet heterojunction material with CeO2 nanoparticles attached to the surface, namely WO-NiSe at CeO2. The introduction of high-valence tungstate radicals and the coupling of CeO2 form a strong electron coupling interface on the surface of NiSe, and HER / OER charge transfer is accelerated. And according to a hard-soft acid-base (HSAB) theory, the high-valence metal serving as a relatively hard Lewis acid shows higher selectivity on OH <-> than Cl <->, so that accumulation of Cl <-> on the surface of the catalyst can be inhibited, the catalytic activity is remarkably improved, and the corrosion-resistant life is remarkably prolonged. According to the strategy, a new'activity-stability-cost 'ternary equilibrium normal form with the advantages of low overpotential, long-period stability and salt corrosion resistance is provided for seawater electrolytic hydrogen production, and the theoretical value and the industrialization potential are both achieved.

The invention relates to the field of waste gas treatment, and discloses a sulfur-chlorine-resistant CeO2Mo-MnO2 catalyst, a preparation method thereof and application of the sulfur-chlorine-resistant CeO2Mo-MnO2 catalyst in catalytic oxidation of VOCs. The CeO2 (at) Mo-MnO2 catalyst comprises Mo doped MnO2 nanorods and CeO2 nanoparticles, wherein the CeO2 nanoparticles are attached to the surfaces of the Mo doped MnO2 nanorods in a dot matrix manner; the mass ratio of Mo to Mn is (0.1-1): 1, and the mass ratio of CeO2 to Mo doped MnO2 is (0.01-0.5): 1. According to the catalyst, on the basis of MnO2, firstly, an acidic site is regulated and controlled by doping Mo element, a dissociation site of chlorobenzene is constructed, and the chlorine poisoning resistance of the catalyst can be remarkably improved; secondly, a layer of CeO2 nanoparticles is attached to the surface of Mo-MnO2 in a dot matrix mode, sacrificial sites are constructed, adsorption of SO2 on the surface of the catalyst is inhibited, and the sulfur poisoning resistance of the catalyst can be remarkably improved. The catalyst disclosed by the invention is applied to catalytic oxidation of sulfur-containing and chlorine-containing VOCs (Volatile Organic Compounds), is not easy to inactivate due to poisoning, and has very excellent stability.

According to the aluminum oxide catalyst carrier and the preparation method thereof, ethyl orthosilicate and cerium oxide are combined with aluminum oxide, a stable Si-O-Al covalent bond is formed on the surface of aluminum oxide, a compact SiO2 protective layer is constructed, direct contact between water vapor and hydroxyl is effectively isolated, and therefore the hydrothermal stability of the carrier is remarkably improved; according to the present invention, with the SiO2 network structure, the SiO2 network structure can effectively fix and disperse the CeO2 nanoparticles and prevent the CeO2 nanoparticles from agglomeration and inactivation, and the Al2O3 can promote the migration of the electrons and the oxygen species at the SiO2-Al2O3 interface so as to provide the second corrosion resistance barrier on the protection layer through the cooperation of the oxygen vacancy introduced by the CeO2 and the excellent Cl ion capture ability, such that the corrosion resistance of the aluminum oxide matrix can be further inhibited; the interface bonding strength is enhanced, so that the water poisoning resistance and chlorine corrosion resistance of the aluminum oxide catalyst in a high-humidity and high-chlorine environment are improved through the dual cooperation of tetraethoxysilane and cerium oxide.

The present invention provides a CeO2@Pd nanozyme and a preparation method thereof, the preparation method comprising the following steps: S1. adding ascorbic acid to ultrapure water, ultrasonically dispersing 5 15min to obtain an ascorbic acid solution, S2. adding cerium acetate powder to the ascorbic acid solution obtained in step S1, stirring the reaction at room temperature for 1 3h to obtain a mixed solution; S3. adding potassium hexachloropalladate powder to the mixed solution obtained in step S2, stirring the reaction at room temperature for 1 3h to obtain a reaction solution; S4. centrifuging the reaction solution obtained in step S3 for 10 20min to obtain a precipitate; S5. washing the precipitate obtained in step S4 with anhydrous ethanol and centrifuging 3 times, collecting the precipitate and placing it in a vacuum drying oven to vacuum dry to obtain CeO2@Pd nanozyme. The present invention loads metal Pd on CeO2 nanoparticles, and the obtained CeO2@Pd nanozyme has excellent antioxidant and anti-inflammatory abilities, good stability and biosafety, and organ targeting, and can be used to remove excessive ROS when sepsis-related organ function is damaged.

The present invention relates to the technical field of hemostatic materials, and in particular to a kaolin hemostatic material with anti-inflammatory function, and a preparation method and application thereof. The kaolin hemostatic material with anti-inflammatory function of the present invention comprises kaolin loaded with CeO2 nanoparticles. The preparation method comprises mixing kaolin with cerium chloride, sodium carbonate and sodium chloride in a certain mass ratio, ball milling the mixture and obtaining a precursor, and calcining the precursor to obtain the kaolin hemostatic material with anti-inflammatory function. The present invention adopts kaolinite, which is inexpensive and abundant in reserves, as a raw material, selects conventional CeO2 raw material, and prepares a kaolin-based nanomaterial loaded with CeO2 by a mechanochemical synthesis method, thereby preparing a CeO2 / K nanomaterial with synergistic anti-inflammatory and hemostatic activity.

The preparation method comprises the following steps: dispersing CeO2 nanoparticles in absolute ethyl alcohol containing diluted hydrochloric acid, activating, adding a certain amount of a silane coupling agent and diluted hydrochloric acid, carrying out a water bath reaction for a certain time, separating after the reaction is finished to obtain a surface-modified CeO2 nanoparticle crude product, and purifying to obtain the organic silicon separation membrane. The CeO2 nanoparticles with the modified surfaces are obtained; dissolving an organic silicon precursor 1, 2-bis (triethoxysilyl) ethylene in absolute ethyl alcohol, adding deionized water and diluted hydrochloric acid, heating and stirring to form a Si-OH intermediate, stirring and adding the surface modified CeO2 to obtain CeO2 modified organic silicon sol; coating a porous aluminum oxide ceramic tube with the CeO2 modified organic silicon sol, and calcining to obtain a CeO2 modified separation membrane; compared with an organic silicon separation membrane modified by noble metal, the separation membrane prepared by the method is relatively low in cost, good in stability in a complex gas environment and relatively good in hydrogen selectivity.

The invention discloses an optical waveguide structure composite material based on SAN resin and a preparation method thereof. The raw material composition is as follows: 60-70 parts of SAN resin; 30 to 40 parts of PMMA (polymethyl methacrylate) resin; 0.1 to 1 part of modified nano CeO2; 1 to 5 parts of a maleic anhydride grafted SEBS compatilizer; and 0.1 to 1 part of an antioxidant. According to the material, through a double-effect anti-reflection mechanism of a synergistic effect, the light transmittance gt of a key ultraviolet band is remarkably improved; on one hand, the refractive index difference between the PMMA fibers which are continuously distributed in the axial direction and the SAN matrix is utilized to guide ultraviolet light to generate total internal reflection conduction at an interface, and the inherent strong ultraviolet absorption characteristic of the SAN matrix is effectively avoided; on the other hand, by means of the Rayleigh scattering effect generated by the CeO2 nanoparticles which are subjected to double surface modification and are uniformly dispersed, the transmission efficiency of ultraviolet light is selectively enhanced. According to the preparation method, a slit die head is adopted for extrusion preforming, and key processes of longitudinal hot stretching (inducing PMMA fibrosis) and water bath shock cooling (locking an optical waveguide microstructure) are combined, so that precise construction and large-scale preparation of an optical waveguide structure in the material are realized. The prepared composite material has high ultraviolet light transmittance, excellent mechanical properties and good chemical resistance, and has wide application prospects in the fields of micro-fluidic chips, electrophoresis plates, medical instruments and optoelectronic devices.

This invention belongs to the field of rust-preventive coating material preparation technology, specifically relating to a water-based self-healing rust-preventive coating and its preparation method. First, an unsaturated ester, a fluorinated unsaturated ester, and 1,4-dithiothreitol are prepared into a fluorinated hydrophilic polymer under the conditions of an initiator, a chain extender, and water as a solvent. Then, the obtained fluorinated hydrophilic polymer is reacted in an aqueous phase to prepare a water-based fluorinated acrylic copolymer. Finally, the water-based fluorinated acrylic copolymer is compounded with modified CeO2 nanoparticles, iron oxide, talc, and antioxidant 168 to obtain a water-based self-healing coating material. This invention achieves self-healing of the coating material by introducing a D-A reaction, and uses water as a diluent, is non-toxic, odorless, harmless to humans, and does not pollute the environment. By introducing cerium groups, this coating improves the corrosion resistance of metals, greatly extending the service life of the material and possessing high application value.

The invention provides a cathode material and a preparation method and application thereof. The cathode material disclosed by the invention comprises the perovskite type ferrite core and the CeO2 nanoparticles covering at least part of the surface of the core, so that the cathode material has relatively high oxygen reduction catalytic activity; the Ca element is used for replacing the Sr element, the defect that the Sr element is prone to segregation in the high-temperature and long-term operation process can be overcome, the problem that the Sr element reacts with electrolyte to generate a high-resistance third phase is thoroughly solved, and the tolerance of the cathode material to CO2 in feed gas is further enhanced. The chemical formula of the cathode material is LaaCa (0.4-x) CexCobFecO (3-delta), element selection of the cathode material is limited, and the proportion of each element is limited in a specific range, so that the cathode material has relatively high oxygen reduction catalytic activity and long-term running structural stability, the electrochemical performance of the battery is enhanced, the overall impedance of the battery can be reduced, and the service life of the battery is prolonged. And the maximum power density of the battery is improved.

The application discloses an oxygen-enriched vacancy CeOx@Cu catalyst, a preparation method thereof and application of the catalyst in nitrate reduction, and belongs to the technical field of electrochemical catalytic materials and preparation thereof. The application solves the problems of slow kinetics of conversion of nitrite into ammonia and insufficient supply of active hydrogen species in the existing electrochemical reduction process of nitrate in water. In the application, CeO2 nanoparticles are uniformly loaded on a copper substrate by an electrodeposition method, and a composite catalyst CeOx@Cu with high-density oxygen vacancies is formed through calcination treatment, overflow of oxygen vacancy-mediated *H from CeOx to the copper surface significantly accelerates the reduction kinetics of nitrate, and side reactions are inhibited, thereby excellent ammonia generation performance (404.08 mu mol h ‑1 cm ‑2 ) and high Faraday efficiency (FE reaches 94.6%) are exhibited, and nitrate in wastewater can be effectively converted into ammonia, and electric energy can be recovered.

The invention relates to a preparation method of a Cu-TA at CeO2 nano-enzyme antibacterial agent. The preparation method comprises the steps of preparation of CeO2, preparation of a Cu-TA nanosheet and preparation of the Cu-TA at CeO2 nano-enzyme antibacterial agent. Due to the fact that natural enzyme is prone to inactivation and poor in environmental adaptability, in order to solve the problem, simple hydrothermal reaction is adopted for synthesizing Cu-TA at CeO2 nano-particles, copper ions, tannic acid and cerium oxide are compounded to form artificial nano-enzyme, and the nano-enzyme is good in environmental adaptability, not prone to inactivation and good in stability. Meanwhile, under the catalytic action of hydrogen peroxide, peroxidase activity and a remarkable antibacterial effect are shown, and the compound can be better applied to the antibacterial field and the like and has a good application prospect.

The application discloses a Ru / CeO2-SiO2 catalyst for hydrogen production by ammonia decomposition and a preparation method thereof, and belongs to the technical field of catalyst preparation. The catalyst comprises an active component Ru and a carrier CeO2 / SiO2. The CeO2 nanoparticles are uniformly dispersed on the surface of SiO2 by using an electrostatic adsorption method, and the active component Ru nanoparticles are selectively loaded on the surface of CeO2. The CeO2 has a unique Ce 3+ -Ce 4+ The variable valence capacity can form rich oxygen vacancies. The generation of the oxygen vacancies is favorable to enhancing the interaction intensity between Ru and CeO2, improving the electronic structure of the Ru surface, activating reactants, optimizing reaction kinetics, and promoting the ammonia decomposition reaction. In addition, the Ru particles are only distributed on the surface of CeO2, and even if the CeO2 moves on the surface of SiO2 at high temperature, the active component Ru will not be agglomerated, so that the Ru / CeO2-SiO2 catalyst exhibits excellent ammonia decomposition reaction catalytic performance and good stability.

The application relates to the preparation of nanomaterials and the field of energy catalysis, and provides a phosphide nickel nanoflower catalyst loaded with superfine CeO2 nanoparticles, a preparation method and application. The nanoflower catalyst is composed of Ni2P nanosheets with a thickness of about 3.6 nm, and the nanoflower is uniformly loaded with superfine CeO2 nanoparticles with a particle size of 5.5 nm. A non-ionic surfactant P123 is dissolved in acetone, and is poured into a solvent in a stirring state. Cerium nitrate and nickel acetate are added. Hexamethylenetetramine is added, the mixed solution is transferred to a reaction kettle after being fully stirred, is taken out after being reacted in a reaction oven, is centrifuged, washed and freeze-dried to obtain a powder sample. Sodium hypophosphite is put into a quartz tube furnace for phosphorization treatment to obtain the catalyst X-CeO2 / Ni2P. The preparation method is simple, raw materials are cheap and easy to obtain, and the catalyst can be prepared in a large amount. The catalyst is widely applied to electrocatalytic water decomposition, oxygen reduction reaction (ORR), carbon dioxide reduction reaction (CO2RR), organic catalytic reaction and zinc air battery catalytic reaction.

The application discloses PPy@CeO2 NPs nanoparticles and a preparation method and application thereof, CeO2 nanoparticles are loaded on the surface of polypyrrole nanoparticles, and the preparation method comprises the following steps: S1, polypyrrole nanoparticles are synthesized by using a chemical oxidation polymerization method; S2, Ce 3+ is oxidized into CeO2 nanoparticles in an alkaline environment provided by hexamethylenetetramine, is mixed with polypyrrole nanoparticles, is coated on the surface of the polypyrrole nanoparticles, and PPy@CeO2 NPs nanoparticles are obtained. The PPy@CeO2 NPs nanoparticles can be applied to preparation of photothermal conversion agents and CDT reagents.

The application discloses a CeO2@ZSM-5 composite abrasive particle and a preparation method and application thereof. The CeO2@ZSM-5 composite abrasive particle is prepared by loading CeO2 nanoparticles on the surface of ZSM-5 molecular sieve through an in-situ precipitation method. The introduction of ZSM-5 effectively inhibits the agglomeration of CeO2 nanoparticles, and the microporous structure of ZSM-5 can adsorb and enrich H2O2 to construct a local high-reactivity environment at the abrasive particle interface. The Brønsted acid and Lewis acid sites in the molecular sieve can synergistically promote the catalytic decomposition of H2O2 and stabilize the active cerium species. The CeO2 and ZSM-5 form a synergistic mechanism of "catalytic decomposition-pore enrichment-acid activation", which significantly improves the generation efficiency of hydroxyl radicals (•OH). Compared with conventional pure CeO2 abrasive particles, the material removal rate of the CeO2@ZSM-5 composite abrasive particle on silicon carbide is increased by 133%, and the surface roughness after polishing is reduced to 1.11 nm, realizing high-efficiency and high-quality polishing.

The invention relates to the technical field of exchange membranes, and discloses an inorganic doping modified proton exchange membrane which comprises the following components in percentage by weight: 10-30% of a proton exchange membrane, the composite material is prepared from 40%-60% of perfluorinated sulfonic acid resin (Nafion), 5%-10% of CeO2 nanoparticles, 5%-10% of TiO2 nanoparticles, 0.1%-1% of quantum dots, 1%-5% of graphene (GO), 2%-5% of ionic liquid and 1%-2% of polyvinyl alcohol (PVA). According to the technical scheme of combining inorganic doping modification with a composite material, CeO2 nanoparticles, quantum dots and graphene are added, so that the technical effect of remarkably improving the conductivity of the proton exchange membrane is achieved, and the problem is solved by optimizing a proton conduction path. The added inorganic particles and graphene obviously enhance the proton conductivity, and the membrane is more stable especially under high-humidity and high-temperature conditions.

The invention relates to the technical field of photocatalysis of water treatment, and discloses a BiOCl / CeO2 heterojunction photocatalyst with a double-electric-field coupling effect as well as a preparation method and application of the BiOCl / CeO2 heterojunction photocatalyst. The preparation method comprises the following steps: firstly, synthesizing a BiOCl nanosheet with an exposed (001) crystal face through a hydrothermal method; then loading CeO2 nanoparticles on BiOCl by adopting a chemical deposition method to form a heterojunction; and introducing surface oxygen vacancies through illumination treatment to obtain the catalyst. By regulating and controlling the exposed crystal face of BiOCl, a bulk phase self-generated electric field (SIEF) of BiOCl is mutually coupled with a heterojunction interface electric field (IIEF), the SIEF drives bulk phase photo-generated electrons to directionally migrate to an interface, and the IIEF promotes interface charge separation, so that bulk phase and interface compounding of photo-generated carriers is synergistically inhibited; the catalyst shows excellent photocatalytic degradation performance on perfluorooctanoic acid (PFOA) in water, the defluorination rate can reach 30.59%, the activity is kept above 90% after the catalyst is recycled for 4 times, and an efficient and stable solution is provided for deep removal of persistent organic pollutants.

A cathode material, and a preparation method therefor and the use thereof. The cathode material comprises a perovskite-type ferrite core and CeO2 nanoparticles covering at least part of the surface of the core, which can make the cathode material have high catalytic activity for oxygen reduction. By replacing Sr with Ca, the drawback of Sr being prone to segregation during high-temperature and long-term operation can be overcome, the problem of Sr reacting with an electrolyte to form a high-resistance third phase can be completely solved, and the tolerance of the cathode material to CO2 in a feed gas can be favorably enhanced. The chemical formula of the cathode material is LaaCa0.4-xCexCobFecO3-δ. By limiting the options for the elements in the cathode material and limiting the proportion of each element to be within a specific range, the cathode material is made to have high catalytic activity for oxygen reduction and structural stability for long-term operation, which thus enhances the electrochemical performance of a battery, and can reduce the overall impedance of the battery and increase the maximum power density of the battery.

The invention relates to the technical field of oral medical materials, and provides ICG-loaded PCF-1 (namely IP particles) / CeO2 (at) SIS double-layer hydrogel and a preparation method and application thereof.The ICG-loaded PCF-1 (namely IP particles) / CeO2 (at) SIS double-layer hydrogel is of an injectable layered spherical shell structure, on one hand, spherical shell outer-layer gel-loaded IP particles are synthesized, and due to the concentration, the hydrogel has better ductility when an outer layer coating is formed; the addition of the PCF-1 crystalline framework can disperse and stabilize the photosensitizer ICG, the photosensitizer can generate a large amount of ROS antibiosis after excitation, and meanwhile, the environment temperature is increased, the degradation and release of the outer gel are accelerated, so that the antibacterial efficiency under unit energy is improved; on the other hand, the SIS gel on the inner layer loads and releases CeO2 nanoparticles (namely CeO2NPs), free ROS is removed, the immune microenvironment is adjusted, the obvious effect on periodontitis treatment is achieved, the maximization of the curative effect is guaranteed, and the good clinical application value is achieved.

The invention discloses high-temperature-resistant thermo-oxidative-aging-resistant flame-retardant oxygen-containing vacancy cerium-based filler silicone rubber and a preparation method thereof, and relates to a silicone rubber-containing composite material and a preparation method thereof. The silicone rubber composite material comprises a silicone rubber matrix and a cerium-based composite filler dispersed in the silicone rubber matrix, the filler is M / CeO2 nanoparticles, and the M / CeO2 nanoparticles are prepared through coprecipitation and calcination; optionally, vinyl-containing siloxane is used for modifying the surface of the Vinyl-M / CeO2 material, and a vinyl-grafted Vinyl-M / CeO2 material is obtained; and finally, mixing and vulcanizing the filler with vinyl silicone oil, hydrogen-containing silicone oil, an inhibitor, a platinum catalyst, white carbon black and other components. The cerium-based filler is subjected to transition metal doping and surface modification, so that the compatibility of the cerium-based filler with a silicone rubber matrix and the participation degree of the cerium-based filler in a curing system are remarkably improved. The material shows excellent thermal stability, flame retardance and thermo-oxidative aging resistance, keeps good mechanical properties and processing fluidity, and has wide application prospects in the high-end fields of electronic packaging, new energy batteries and the like.

This invention belongs to the field of proton ceramic electrochemical battery technology, and discloses a cobalt-free air electrode material for a reversible proton conductor type ceramic electrochemical battery, its preparation, and its application. The air electrode material has PrBa 0.8‑x Ca 0.2 Fe 1.8 Ce 0.2‑y O 6‑δ The three-phase structure of BaCeO3 and CeO2 forms BaCeO3 and CeO2 nanoparticles attached to PrBa 0.8‑x Ca 0.2 Fe 1.8 Ce 0.2‑y O 6‑δ Heterogeneous structure on the surface of the skeleton; where 0

Au@CeO2 nanoparticles comprising an Au core having an average diameter from 5 to 100 nm and a CeO2 shell having a thickness from 5 to 20 nm for use in simultaneous imaging diagnosis and radio-protection are disclosed. It is also disclosed a theragnostic agent comprising Au@CeO2 nanoparticles and pharmaceutically acceptable excipients and a process for its preparation; wherein the theragnostic agent is in the form of an colloidal solution, and wherein the Au@CeO2 nanoparticles are at a concentration from 10 to 100 mg / mL; wherein the theragnostic agent is a dual-purpose radio-protecting and contrast agent. A process for the preparation of the theragnostic agent.

This invention provides a multifunctional rare-earth composite antibacterial fiber and its preparation method, comprising the following steps: 1. Mixing cerium salt and silicate ester compounds uniformly, adding solvent and urea, introducing N2 for protection, adding a pore-forming agent, and reacting to obtain a sol; 2. Quenching the sol with liquid nitrogen and freeze-drying; 3. Calcining and milling the gel under an inert atmosphere; 4. Adding rare-earth composite antibacterial additives to polyester particles, mixing uniformly, and extruding; 5. Mixing, melting, and spinning the rare-earth composite antibacterial polyester masterbatch with polyester chips to obtain the final product. The multifunctional composite antibacterial fiber of this invention can effectively block the aggregation phenomenon of Ce during oxide formation, thereby obtaining a material with superior performance; the abundant mobile oxygen vacancies of CeO2 nanoparticles form heterojunctions with silica, improving the ROS oxidation mechanism and promoting antibacterial performance.

The application relates to the technical field of permanent magnet materials, and discloses a magnetic steel nickel plating layer cleaning and drying process, which comprises the following steps: S1, ultrasonic cleaning: taking ultrapure water as a medium, and placing the magnetic steel material plated with a nickel plating layer into an ultrasonic cleaning machine to perform cleaning; S2, bubble cleaning: taking ultrapure water as a medium, and placing the magnetic steel material cleaned in step S1 into a bubble cleaning machine to perform cleaning; S3, heating cleaning: taking a plating self-repairing type cleaning solution as a medium, and placing the magnetic steel material cleaned in step S2 into a heating cleaning tank to perform heating cleaning; S4, dehydration: placing the magnetic steel material cleaned in step S3 into a dehydrator to perform dehydration; and S5, drying: placing the magnetic steel material dehydrated in step S4 into a drying box to perform heating drying, wherein the active components of the plating self-repairing type cleaning solution comprise perfluoropolyether, nanometer silane and CeO2 nanoparticles, and the solvent is ultrapure water. The process can be operated in batches, has a short time consumption, and is high in safety.

The invention discloses a preparation method of a Ni2Al3 nano composite coating containing CeO2 dispersed nanoparticles. The preparation method comprises the following steps: (1) cutting a nickel plate into a sample; (2) carrying out step-by-step mechanical polishing on the sample by using SiC abrasive paper, and carrying out ultrasonic cleaning in deionized water, ethanol and acetone in sequence; (3) preparing a Ni-CeO2 nano composite layer on the nickel substrate through electro-deposition; (4) characterizing the surface appearance and elemental composition of the Ni-CeO2 nano composite layer by using a scanning electron microscope and energy spectrum analysis, and carrying out quantitative analysis on the CeO2 content through INCA software; (5) confirming the particle size of the CeO2 nanoparticles through a transmission electron microscope; and (6) the Ni-CeO2 nano composite film is treated through a low-temperature embedding aluminizing process, and the Ni2Al3-CeO2 composite coating is obtained. The coating method is not only suitable for pure nickel, but also suitable for nickel-based high-temperature alloy, stainless steel, Ni-Cr and other alloys. The invention provides an economical, efficient, extensible and effective solution for improving the durability of materials in high-temperature industrial application.

The invention discloses a preparation method of CeO2 nanoparticles with controllable grain size and morphology, and belongs to the technical field of rare earth oxide preparation. Cerous nitrate is used as a cerium source, polyvinylpyrrolidone is used as a surfactant, deionized water and / or organic alcohol are / is used as a solvent, a solvent system of different solvent combinations is constructed, and the CeO2 nanoparticles with controllable grain size and morphology are prepared. Meanwhile, by adjusting the solvent type and the solvent proportion of the solvent system, the CeO2 nano-particles with different sizes and morphologies can be obtained without roasting, so that the sizes and morphologies of the CeO2 nano-particles can be accurately controlled, and the particles are highly dispersed and distributed. The problems that in the prior art, it is difficult to achieve collaborative precise regulation and control over the grain size and morphology of CeO2 nanoparticles, the product dispersity is poor, and the process repeatability is low are solved.

The application relates to an antioxidant broad-spectrum sunscreen film and a preparation method thereof and relates to the technical field of biological materials. TiO2 and a dispersing agent are added into water, and the pH is adjusted to be alkaline; a cerium sulfate solution is added, then heating is carried out, CeO2 is obtained by hydrolysis of the cerium sulfate, and the CeO2 is deposited on the surface of the TiO2, TiO2@CeO2 nanoparticles are obtained; the TiO2@CeO2 nanoparticles, the dispersing agent and dopamine hydrochloride are added into water, the pH is adjusted to be alkaline, then heating is carried out, the dopamine is coated on the surface of the CeO2, and TiO2@CeO2@PDA nanoparticles are obtained; the TiO2@CeO2@PDA nanoparticles, polydimethylsiloxane, fumed silica, water, an emulsifying agent, a thickening agent, a preservative, hydroxyethyl cellulose and a catalyst are added into water, uniform mixing is carried out, vacuum is drawn, and an antioxidant broad-spectrum sunscreen film is obtained. The sunscreen film prepared by the application has strong antioxidant property, good biocompatibility and a broad-spectrum sunscreen effect.

This invention discloses a heavy metal passivation and stabilization material, its preparation method, and its application. The heavy metal passivation and stabilization material provided by this invention includes iron-carbon micro / nanofibers and CeO2 nanoparticles loaded on the iron-carbon micro / nanofibers. The above-mentioned heavy metal passivation and stabilization material provided by this invention uses iron-carbon micro / nanofibers as the carrier material. The carrier material is composed of stacked nanoparticles with an uneven surface, providing uniform and abundant nucleation sites for the loaded CeO2, thus stabilizing a large number of loaded CeO2 nanoparticles. Experimental results show that the iron-carbon micro / nanofibers@CeO2 prepared by this invention have good adsorption, passivation, and stabilization effects on heavy metals, especially arsenic, in various media, and also have a good removal effect on arsenic even at low dosages.

The invention provides an artificial bone based on bimetallic site nano-enzyme and a preparation method and application thereof, and belongs to the field of artificial bone preparation. The preparation method of the artificial bone comprises the following steps: preparing Au / CeO2 compounded bimetallic site nano-enzyme; performing laser treatment on the bimetallic site nano-enzyme to obtain modified nano-enzyme; mixing polylactic acid, hydroxyapatite and the modified nano-enzyme, dispersing, drying, grinding and sieving to obtain uniform composite biological powder; based on a three-dimensional model of a bone defect of a patient, printing the composite biological powder layer by layer by using a selective laser sintering additive manufacturing method to prepare an artificial bone with a porous structure. According to the invention, the synergistic catalytic activity of Au and CeO2 nanoparticles is utilized, Au cluster + CeO2 oxygen vacancy neighbor double catalytic sites are constructed through a laser ablation technology, and the personalized artificial bone with the functions of reducing blood sugar, resisting oxidative stress and promoting regeneration by oxygen supply is prepared through laser additive manufacturing.