508 results about "Europium" patented technology

The invention discloses a preparation method of injectable nano composite hydrogel for relieving osteoarthritis, which comprises the following steps: firstly, synthesizing nano rod-like hydroxyapatite with the length of 150-300 nm and the diameter of 10-15 nm, and the hydroxyapatite is hydrophilic hydroxyapatite doped with strontium and europium ions; the preparation method comprises the following steps: by taking Ca (NO3) 2, Sr (NO3) 2, Eu (NO3) 3 and soluble phosphate as main raw materials, carrying out hydrothermal reaction to prepare strontium and europium ion co-doped hydrophobic hydroxyapatite, dispersing the strontium and europium ion co-doped hydrophobic hydroxyapatite in a Tris-HCl buffer solution, adding tannic acid, stirring, centrifugally collecting precipitate, and drying to obtain strontium and europium ion doped hydrophilic hydroxyapatite; the preparation method comprises the following steps: taking chondroitin sulfate and adipic dihydrazide as main raw materials, stirring, dialyzing, freeze-drying, and dissolving in a buffer solution to obtain the chondroitin sulfate solution grafted with the hydrazide group; the preparation method comprises the following steps: taking hyaluronic acid, 3-aminophenylboronic acid and sodium periodate as main raw materials, stirring, dialyzing, freeze-drying, and dissolving in a buffer solution to obtain the phenylboronic acid group grafted oxidized hyaluronic acid solution; the preparation method comprises the following steps: blending hydrophilic hydroxyapatite doped with strontium and europium ions, a chondroitin sulfate solution grafted with a hydrazide group, an oxidized hyaluronic acid solution grafted with a phenylboronic acid group and a recombinant collagen solution, and stirring to obtain the injectable nano composite hydrogel. The injectable nano composite hydrogel obtained by the invention has good biocompatibility, and a favorable local immune microenvironment can be created to immunomodulate macrophages so as to relieve osteoarthritis and promote subchondral bone repair.

The invention provides a samarium / europium / gadolinium-containing zirconium hydride block as well as a preparation method and application thereof, and relates to the technical field of radiation shielding materials. The zirconium hydride block containing samarium / europium / gadolinium comprises the following elements in percentage by mass: 95% < = Zr < = 99.5%, 0% < = Gd < = 5%, 0% < = Sm < = 5%, 0% < = Eu < = 5% and 0% lt. Gd + Sm + Eu < = 5%. The preparation method comprises the following steps: respectively hydrogenating sponge zirconium, metal gadolinium, metal europium and metal samarium to respectively obtain corresponding hydride powder; weighing zirconium hydride powder, gadolinium hydride powder, europium hydride powder and samarium hydride powder according to a required proportion, and uniformly mixing under a protective atmosphere; and carrying out pressure sintering on the mixed powder, and carrying out secondary hydrogenation to obtain the zirconium hydride block containing samarium / europium / gadolinium. According to the invention, the absorption of the material to low-energy-segment neutrons can be obviously improved; and the preparation of the zirconium hydride block containing samarium / europium / gadolinium and the accurate regulation and control of doped elements are realized.

The embodiment of the invention discloses a preparation method of a europium-barium-copper oxide superconducting sputtering target material, which comprises the following steps: mixing europium oxide powder, barium carbonate powder and barium oxide powder according to a set proportion, and then mixing with a dispersing agent and water to obtain first europium-barium-copper oxide slurry; carrying out spray granulation on the first europium-barium-copper oxide slurry to obtain first mixed powder; calcining the first mixed powder, and mixing the calcined first mixed powder with a dispersant, a binder and water to obtain second europium barium copper oxide slurry; performing spray granulation on the second europium-barium-copper oxide slurry to obtain second mixed powder; carrying out compression molding-cold isostatic pressing on the second mixed powder to obtain a europium-barium-copper oxide target material biscuit; wherein the mold pressing pressure ranges from 3 MPa to 6 MPa, and the cold isostatic pressing pressure ranges from 100 MPa to 250 MPa; the europium-barium-copper oxide target material biscuit is subjected to degreasing and sintering integrated treatment, and the europium-barium-copper oxide superconducting sputtering target material is obtained; the relative density of the europium barium copper oxide superconducting sputtering target material is as high as 97.98%, and the bulk resistivity is as low as 1.98 m omega.cm.

A light-emitting device including an organometallic compound having a metal such as is platinum (Pt), palladium (Pd), copper (Cu), silver (Ag), gold (Au), rhodium (Rh), ruthenium (Ru), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), or thulium (Tm) is provided. The light-emitting device may include a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and comprising an emission layer. The light-emitting device may be included in an electronic apparatus.

The invention belongs to the field of magnetic materials, and particularly discloses europium-based silicate as well as a preparation method and application thereof. The general chemical formula of the europium-based silicate is Eu2SiO4, and the europium-based silicate is subjected to secondary magnetic phase change from a paramagnetic state to a ferromagnetic state at the magnetic phase change temperature of 5.8 K; and at the temperature of 5.5 K, when the magnetic field change is 0-2T, the maximum magnetic entropy change is greater than 10J. Kg <-1 >. K <-1 >. The europium-based silicate disclosed by the invention generates paramagnetic to ferromagnetic phase change near the liquid helium temperature, is accompanied by a low-magnetic-field giant magnetothermal effect near the magnetic phase change temperature, shows large magnetic entropy change and refrigerating capacity near the liquid helium temperature, and has a wide application prospect in the field of magnetic refrigeration in a liquid helium temperature region.

The invention relates to a red fluorescent material excited by blue light, an LED device and fluorescent ceramic. The chemical formula of the red fluorescent material is La (2-x) MgNbO6.5: xEu < 3 + >, wherein x is more than or equal to 0.01 and less than or equal to 0.1. The preparation method comprises the following steps: weighing lanthanum oxide, magnesium oxide, niobium oxide and europium oxide raw materials according to a stoichiometric ratio, grinding and uniformly mixing; sintering the uniformly mixed powder in a muffle furnace at high temperature, and cooling to room temperature to obtain the red fluorescent material. Compared with the prior art, the novel oxide-based red fluorescent powder prepared by the invention can emit positive red light of which the central wavelength is 616nm under the excitation of 465nm blue light, and can be used for white light LED (Light Emitting Diode) luminescent devices and fluorescent ceramics.

The invention discloses an acoustic response light-emitting composite nanomaterial as well as a preparation method and application thereof, and belongs to the technical field of light-emitting composite nanomaterials. The acoustic response luminescent composite nano material provided by the invention comprises hollow mesoporous silica nano particles and europium-doped barium titanate nano particles loaded on the surfaces of the hollow mesoporous silica nano particles and in mesopores; the chemical formula of the europium-doped barium titanate nanoparticles is BaTiO3: Eu < 3 + >; the mass ratio of the hollow mesoporous silica nanoparticles to the europium-doped barium titanate nanoparticles is 1: (0.8-1.5). The sound response luminescent composite nano material provided by the invention can realize detection of sound intensity, and has good temperature stability, and meanwhile, the preparation method is simple and low in cost.

The invention belongs to the field of fluorescence detection, and particularly relates to a ratio-type fluorescent nanoprobe for specifically detecting tetracycline antibiotics as well as a preparation method and an application method of the ratio-type fluorescent nanoprobe. The nano-probe is a europium modified zinc gallium germanate nano-material, and is prepared by amino modification, citric acid modification and europium modification of the zinc gallium germanate nano-material. The probe can be specifically combined with tetracycline antibiotics; the fluorescent probe has two different fluorescence emission intensities, so that interference can be effectively eliminated, and the detection accuracy is high. And the synthesis method is simple and low in cost. The ratio type fluorescent nanoprobe provided by the invention also can realize the change of different colors under an ultraviolet lamp, can realize quantitative visual detection of tetracycline by combining the RGB value and the tetracycline concentration change, and can realize rapid on-site detection of tetracycline in a sample without the help of a fluorescent instrument. The tetracycline fluorescent probe is stable in optical performance, not prone to photobleaching, high in tetracycline recognition capacity, wide in response range (0.2-70 [mu] M) and low in detection limit, and has remarkable industrial application potential.

The invention discloses a europium-based metal-organic framework as well as a preparation method and application thereof, and belongs to the technical field of bioassay materials. The preparation method of the europium-based metal-organic framework comprises the following steps: adding europium salt, H4BTA-2OH and ascorbic acid into a binary solution, and sequentially performing ultrasonic treatment, heating and post-treatment to prepare the europium-based metal-organic framework (the molecular formula is {[(CH3) 2NH2] [Eu (BTA-2OH) (H2O) 2]. 4H2O} n). In addition, the invention also discloses an application of the europium-based metal-organic framework in detection of a bacillus anthracis biomarker 2, 6-dipicolinic acid (DPA). The europium-based metal-organic framework Eu-MOF prepared by the method can rapidly detect 2, 6-dipicolinic acid, and has high selectivity and sensitivity, and the excellent fluorescence sensing ability means that the europium-based metal-organic framework Eu-MOF is a potential bacillus anthracis detection material.

The invention belongs to the technical field of magnetic refrigeration, and particularly discloses a rare earth europium-based zirconate magnetic refrigeration material and a preparation method and application thereof. The general chemical formula of the rare earth europium-based zirconate magnetic refrigeration material is (Eu1-xMx) (Zr1-yNy) O3, M is any one of Ca, Sr or Ba, N is any one of Nb, Ta, Ti or Hf, x is more than or equal to 0 and less than or equal to 0.5, y is more than or equal to 0 and less than or equal to 0.5, and the magnetic phase transition temperature of the rare earth europium-based zirconate magnetic refrigeration material is less than 10K. The magnetic refrigeration material shows excellent magnetocaloric performance near the liquid helium temperature, and is expected to be applied to the liquid helium temperature zone magnetic refrigeration technology; and the preparation method is simple in process, safe and environment-friendly, and can be applied to industrial production.

The invention discloses a cobalt-iron layered double-metal hydroxide water treatment catalyst, which is characterized in that the cobalt-iron layered double-metal hydroxide is doped with europium element. Compared with existing ferrocobalt layered double hydroxides, after europium is doped, europium can generate a synergistic interaction effect with iron and cobalt, so that the catalytic activity of the material is remarkably improved.

The invention discloses a preparation method and application of a functionalized hydrogen bond organic framework material induced by high-energy electron beam irradiation, and belongs to the technical field of new environmental detection materials.The preparation method comprises the steps that europium salt and a hydrogen bond organic framework material are added into an aqueous solution and stirred to be uniform, and the mixed solution is irradiated through high-energy electron beam irradiation to obtain the functionalized hydrogen bond organic framework material. And centrifugally cleaning the mixed solution subjected to high-energy electron beam irradiation with ethanol to obtain the high-energy electron beam irradiation induced functionalized hydrogen bond organic framework material. The preparation method of the functionalized hydrogen bond organic framework material induced by high-energy electron beam irradiation has the advantages of relatively simple operation, low cost, large-scale preparation and the like; the high-energy electron beam irradiation induced functionalized hydrogen bond organic framework material prepared by the invention has the characteristics of double emission peaks and self-calibration detection; the high-energy electron beam irradiation induced functionalized hydrogen bond organic framework material prepared by the invention shows stable optical properties; the high-energy electron beam irradiation induced functionalized hydrogen bond organic framework material prepared by the invention can better detect thorium in deionized water through a resonance energy transfer effect and an internal filtering effect.

The invention discloses a rare earth metal doped transition metal electrocatalyst and a preparation method and application thereof, the chemical formula of the catalyst is Eu-CoS1.097, the catalyst is of a crystalline and amorphous structure, and the Eu element exists in a monatomic form; the preparation method comprises the following steps: (1) dissolving polyvinylpyrrolidone and NH2-H2BDC in a solvent to obtain a mixed solution; (2) adding cobalt salt and europium salt into the mixed solution, uniformly mixing, and carrying out hydrothermal reaction to obtain an EuCo-MOF precursor; and (3) adding the EuCo-MOF precursor and thioacetamide into a solvent, and carrying out hydrothermal reaction, so that TAA releases S < 2->, and etching to obtain the rare earth metal doped transition metal electrocatalyst with a hollow spherical structure. According to the catalyst disclosed by the invention, atomic-scale Eu is doped in cobalt sulfide, so that the activity of the transition metal catalyst is effectively improved; the preparation method is simple and efficient.

The invention belongs to the technical field of nano composite materials, and relates to a preparation method and application of a difunctional nano enzyme Eu (at) Ce-MOF. According to the invention, ceric ammonium nitrate is used as an inorganic metal source, terephthalic acid is used as an organic ligand, and Ce-MOF is synthesized in one step by using a hydrothermal method; and then introducing europium nitrate hexahydrate and sodium citrate to prepare the Eu (at) Ce-MOF composite material through one-step in-situ functionalization. Ce-MOF is functionalized by using europium nitrate hexahydrate, and second metal activity is introduced, so that the bi-metal synergistic effect is realized to enhance the peroxidase-like activity of the composite material; meanwhile, the introduced Eu < 3 + > is used as a recognition element and has specific recognition capability on Pi, specific recognition sites of the Eu-coated Ce-MOF composite material are increased, and the difunctional nano-enzyme with strong enzyme-like activity and specific recognition capability is prepared.

The invention discloses an electrochemical test performed by preparing a novel electrochemical luminescence material and application of the electrochemical luminescence material to an electrochemical luminescence sensor. The invention designs an electrochemical luminescence sensor for detecting carbaryl based on a rare earth metal Eu co-reaction-free promoter complex illuminant. Specifically, the electrochemical luminescence sensor is prepared by taking a complex of rare earth metal europium as a luminescent material and potassium persulfate as a co-reactant. The sensor shows an excellent development prospect in the aspect of carbaryl detection.

The invention discloses a novel europium-cerium flow battery electrolyte and a preparation method thereof, and belongs to the technical field of flow battery energy storage. The theoretical voltage of the novel europium-cerium flow battery is 1.9 V, and the novel europium-cerium flow battery has higher energy density and power density. According to the synthesis strategy, a chelating agent is added into a solution containing europium or cerium, the molecular size of the formed chelate is large, and cross contamination caused by active ion transmembrane is avoided. The chelating agent can stabilize the reduction state of metal ions and slow down the oxidation reaction between the electrolyte and oxygen. The electrolyte is low in cost and suitable for being used in a neutral environment, europium and cerium are rare earth metals, have rich resource reserves, a complete industrial chain, advanced technical accumulation and policy support of the government in China, are matched with a chelating agent to improve oxidation-reduction kinetics, can be applied to a photovoltaic energy storage system on a large scale, and has a wide application prospect. Wide application prospects are also realized in the aspect of novel power automobiles.

The invention discloses a triiodothyronine dissociation agent, a detection kit, a preparation method of the triiodothyronine dissociation agent and application of the triiodothyronine dissociation agent and the detection kit, and the triiodothyronine dissociation agent comprises 10-100 mM of acetic acid-sodium acetate buffer solution, 0.05-1 g / L of ethylene diamine tetraacetic acid disodium salt, 1-10 g / L of perfluoroalkyl ethyl methacrylate, 0.2-1 mL / L of Tween-20 and 0.2-2 mL / L of ProClin 300, the pH (Potential of Hydrogen) of the triiodothyronine dissociation agent is 5.5 + / -1; the kit comprises a triiodothyronine dissociation agent and a reagent strip. According to the present invention, the two sites can be specifically recognized, the sensitivity and the specificity are high, the high-specificity detection on the specific antigen can be achieved, and the low-end sensitivity is high; meanwhile, the interference problem of rare earth europium during detection of triiodothyronine can be solved, and the accuracy of a detection result is further improved.

The invention provides a doped yttrium hydride neutron moderation material and a preparation method and application thereof, and belongs to the technical field of radiation shielding materials. At least one of samarium, europium and gadolinium is doped in yttrium hydride in the form of hydride, and the mass ratio of metal yttrium to metal gadolinium to metal europium to metal samarium is controlled, so that the neutron moderation effect of the neutron moderation material can be improved. According to the invention, at least one of gadolinium hydride, europium hydride and samarium hydride is mixed with yttrium hydride under the protective atmosphere, so that the mass content of each element in the doped yttrium hydride neutron moderation material can be accurately controlled. According to the invention, the mixture is sintered and molded, and the sintering parameters of sintering and molding are controlled, so that the components of the mixture are sintered in a compact state, cracks generated by thermal expansion and cold contraction can be reduced, and the doped yttrium hydride keeps high density and has fewer cracks and defects.

The invention provides a porphyrin bimetal organic framework fluorescent probe, a preparation method and application of the porphyrin bimetal organic framework fluorescent probe in trivalent chromium ion detection. According to the preparation method, 5, 10, 15, 20-tetra (4-carboxyl phenyl) porphyrin and 2-amino terephthalic acid react with europium chloride hexahydrate and terbium chloride hexahydrate, so that the bimetal organic framework fluorescent probe is obtained. The fluorescent probe can be used for detecting Cr < 3 + > in water, and the detection limit is as low as 10.83 nM, so that the fluorescent probe can be used for rapid, high-sensitivity and high-selectivity detection of Cr < 3 + >.

The invention discloses a preparation method of a cellulose nanocrystalline composite film with circular polarization luminescence characteristics. The preparation method specifically comprises the following steps: step 1, synthesizing europium macromolecules; and 2, preparing the coating type circular polarization luminous cellulose composite film according to the product obtained in the step 1. The invention further discloses the cellulose nanocrystalline composite film with the circular polarization luminescence characteristic. The problems that an existing composite film is low in asymmetric factor and unstable in CPL performance are solved.

A light emitting device, an electronic device, an electronic apparatus, and an organometallic compound including an organometallic compound having a metal such as platinum (Pt), palladium (Pd), copper (Cu), silver (Ag), gold (Au), rhodium (Rh), ruthenium (Ru), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), or thulium (Tm) are provided. The light emitting device may include a first electrode, a second electrode facing the first electrode, and an intermediate layer between the first electrode and the second electrode and including an emission layer. A light emitting device may be included in an electronic apparatus.

The invention discloses a beryllium-copper alloy and a production process thereof, and belongs to the technical field of copper alloy materials, the beryllium-copper alloy comprises the following raw materials by weight: 2-2.5% of beryllium, 1.3-2% of nickel, 0.05-0.1% of titanium, 1.2-1.5% of a covering agent, and the balance of copper and inevitable impurities; the preparation method comprises the following steps: adding beryllium, nickel, titanium and copper into a medium-frequency induction melting furnace, heating to 1360-1460 DEG C under a protective atmosphere to prepare a melt, adding a covering agent, smelting for 2-4 hours, standing, slagging off, and cooling to room temperature to prepare a beryllium-copper alloy; after the covering agent is added into a melt, on one hand, beryllium can be fully protected from being oxidized to cause loss, on the other hand, the special hollow structure of mullite can play a role in heat preservation and guarantee smooth proceeding of the smelting process, magnesium chloride, europium oxide and yttrium vanadate introduced to the surface can participate in refining of the melt, and the comprehensive performance of the alloy is further improved.

The invention relates to an ultraviolet-excited blue fluorescent material as well as a preparation method and application thereof, the chemical expression of the blue fluorescent material is Rb2La1-xCl5: xEu < 2 + >, and x is more than or equal to 0.005 and less than or equal to 0.08. The preparation method comprises the following steps: (1) weighing raw material powder of a rubidium source compound, a lanthanum source compound and a europium source compound according to a stoichiometric ratio, and homogenizing to obtain a mixture; (2) grinding and uniformly mixing the mixture obtained in the step (1) to obtain raw material powder; and (3) sintering the ground raw material powder, and then cooling to room temperature to finally obtain the ultraviolet-excited blue fluorescent material. Compared with the prior art, the ultraviolet-excited blue fluorescent material provided by the invention is a novel ultraviolet-excited Eu < 2 + >-doped halide-based blue-light-emitting fluorescent powder, and can meet the urgent demands in the aspects of white-light LEDs (light-emitting diodes), sunlight-like LEDs and full-spectrum LEDs at present.

The invention relates to a lanthanide oxide electrochemiluminescence aptamer sensor with dual signal amplification for detecting acetamiprid as well as a preparation method and application of the lanthanide oxide electrochemiluminescence aptamer sensor. According to the sensor, terbium-doped europium oxide (Eu2O3: Tb < 3 + >) modified by gold nanoparticles (Au NPs) is used as a luminous body, and the electrochemical luminescence performance can be remarkably improved through multiple mechanisms: on one hand, the Au NPs can effectively promote generation of more sulfate free radicals; on the other hand, the surface defect passivation effect and the efficient synergistic effect of energy transfer jointly achieve effective amplification of signals. In addition, the wool ball-shaped Ag NPs is used as a plasma resonance signal amplification source, so that the ECL intensity of the sensor is further enhanced. The prepared electrochemical luminescence sensor with the dual signal amplification effect is used for detecting acetamiprid (ACE), has a wide linear range and a low detection limit, and has a wide application prospect in detection of acetamiprid residues in a water environment.

The invention discloses a double-ligand rare earth fluorescent nanoparticle for sensitively detecting copper ions, the double-ligand rare earth fluorescent nanoparticle is a lanthanide element-based ratio type fluorescent nanoparticle for detecting Cu < 2 + >, and the fluorescent nanoparticle has double emission sites, the fluorescent nano particles show strong blue and red fluorescence at the positions of 423 nm and 618 nm; the preparation method of the double-ligand rare earth fluorescent nanoparticles comprises the following steps: preparing a europium nitrate solution, adding a DMSO solution containing luminol into the europium nitrate solution, then adding a PBS buffer solution into the europium nitrate solution, and stirring at room temperature to obtain a clear and transparent solution containing a precursor Eu-lu complex; the preparation method of the double-ligand rare earth fluorescent nanoparticles is simple, the copper ions can be stably measured for a long time, the stability is good, the preservation time is long, and the double-ligand rare earth fluorescent nanoparticles play an important role in high-sensitivity and visual detection of the copper ions.

The invention discloses europium-doped hydrotalcite for enhancing PVC (polyvinyl chloride) light transmission and a preparation method and application thereof, and belongs to the technical field of high polymer materials and inorganic nanomaterials. Trivalent europium (Eu < 3 + >) is doped into a lattice structure of LDHs (layered double hydroxides) through europium-doped coprecipitation, surface silanization and ultrasonic dispersion technologies; refractive index matching (1.50-1.53) is achieved, and light scattering is reduced. The particle size of the optimized hydrotalcite is controlled to be 50-150 nm, so that the light transmittance of the PVC composite film reaches 93% or above, and meanwhile, the PVC composite film has the characteristic of red fluorescence. Compared with the prior art, the material has the advantages that the transparency is improved, the heat-resistant stability and aging resistance of PVC are remarkably improved, the material is suitable for the fields of transparent films, daylighting panels, optical marks and the like, and the hydrotalcite nano material provided by the invention has the dual effects of refractive index matching and conversion from ultraviolet light to visible light; the light transmittance and the ageing resistance of the PVC material can be obviously improved at the same time.

The invention relates to rare earth doped perovskite quantum dot glass and a preparation method thereof, and belongs to the technical field of inorganic functional materials and optical functional glass. The method comprises the following steps: preparing nanopore SiO2-Al2O3 glass as a matrix by adopting a sol-gel method, adding a lead source and a rare earth europium source, drying and sintering to obtain uniformly-doped porous glass, soaking the uniformly-doped porous glass in a CsBr methanol solution, and generating the CsPbBr3 perovskite quantum dots in situ. In the glass, the CsPbBr3 quantum dots show wavelength-adjustable broadband luminescence, the Eu < 3 + > ions show narrow-band luminescence, and the CsPbBr3 quantum dots and the Eu < 3 + > ions show double-peak reverse fluorescence response under the action of hydrogen chloride gas. The aperture structure can be controlled by adjusting the use amount of the aluminum lactate, so that the size and the luminescence property of the quantum dot and energy transfer between the quantum dot and Eu < 3 + > ions are adjusted, and the luminescence property and the response characteristic are optimized. The material is uniform in doping, stable in structure and suitable for the fields of multiband luminescent devices and gas sensing.

The application discloses a preparation method of a customized porous TMJ prosthesis deposited with europium-doped black phosphorus nanosheets, and comprises the following steps: S1, CBCT is used to shoot medical image data, which is imported into Mimics software to reconstruct a model, the reconstructed model is imported into Geomagic software to simulate bone cutting, and a craniofacial model STL file is obtained; S2, TMJ prosthesis customization design is performed on the craniofacial model STL file; S3, SLM printing technology is adopted to perform 3D printing on the customized TMJ prosthesis model, and a prosthesis entity is obtained; and S4, a polydopamine europium-doped black phosphorus nanosheet surface coating is constructed on the porous region of the prosthesis entity model. The application realizes product customization by adopting computer-aided design and three-dimensional printing technology; the europium-doped black phosphorus nanosheet coating is constructed on the porous region of the prosthesis, the mandibular stump and the buccal region are promoted to grow into bone, the traditional "two-dimensional fixation" is changed into "three-dimensional fixation", and the limitation of screw loosening, falling off and bone resorption is got rid of.

The present invention discloses a dual-emission metal organic framework composite nanomaterial and its application in ratiometric detection of tetracycline antibiotics. The dual-emission metal organic framework composite nanomaterial is loaded with blue carbon quantum dots, adenosine-5'-monophosphate sodium salt and Eu 3+ The UiO-66 metal organic framework material has a size of 20 to 50 nm. The present invention uses adenosine-5'-monophosphate sodium salt to modify the metal organic framework, which increases the rigidity of the material and ensures the Eu 3+ The stable loading of carbon quantum dots into a metal-organic framework material overcomes the difficulty of separating carbon quantum dots in practical applications. The composite nanomaterial utilizes the pre-enrichment effect of the metal-organic framework, using the blue carbon quantum dot signal as a reference signal and the red europium signal as a response signal to achieve ratiometric detection of tetracycline antibiotics. This method offers the advantages of high sensitivity and fast response speed, with a detection limit of 5.6 nM for tetracycline and a response time of only 10 seconds.

The present invention belongs to the fields of catalysts and petrochemicals, and specifically relates to a catalyst, its preparation method, and its application. The catalyst comprises a composite support and an active metal Ni supported on the composite support. The composite support is composed of a modifier and a natural mineral compound, wherein the modifier comprises zirconium and a rare earth metal. The natural mineral is selected from one or more of diatomaceous earth, sepiolite, halloysite, attapulgite, vermiculite, and molybdenite. The rare earth metal is selected from one or more of yttrium, lanthanum, cerium, neodymium, samarium, europium, gadolinium, and ytterbium. The catalyst of the present invention has good structural stability and exhibits high activity and selectivity in the catalytic production of DMS. The catalyst of the present invention exhibits excellent performance in the hydrogenation of DMM to produce DMS, effectively improving DMS selectivity and reducing the production of GBL, BDO, and THF.