82results about "Lanthanum oxide/hydroxides" patented technology

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

The present invention generally relates to a lanthanum oxide (La2O3)-reduced graphene oxide (rGO) nanocomposite-based humidity sensor device designed for high-performance detection across a wide relative humidity range of 11-95%. The sensor comprises an interdigitated electrode (IDE) substrate featuring a plurality of electrodes patterned on an insulating base. A sensing layer composed of a nanocomposite of La2O3 and rGO in the ratio of (x)La2O3+(1−x)rGO, where x ranges from 0.1 to 0.3, is deposited on the IDE using a drop-casting method. The slurry used for deposition includes ethanol as a solvent, and the coated substrate is subjected to mild heating at 60° C. to 80° C. for 1 to 2 hours to enhance adhesion and uniformity. The IDEs, made of gold, silver, or their composition, are connected to external leads interfaced with a measurement unit that enables real-time monitoring and quantification of humidity changes in the surrounding environment.

The present invention relates to a mixed oxide of titanium, niobium and lanthanum of formula (I): LiwTi1-xLaxNb2-yM1yO7-zM2z (I) in which: 0.03 ≤ x ≤ 0.08M1 and M2 are at least one element selected from the group consisting of V, Ta, Fe, Co, Ti, Bi, Sb, As, P, Cr, Mo, W, B, Na, Mg, Ca, Ba, Pb, Al, Zr, Si, Sr, K, Cs and Sn; 0 ≤ w ≤ 5, 0 ≤ y < 2 and 0 ≤ z ≤ 0.3. Figure for abstract: [Fig. 8]

The application discloses a kind of red mud gradient depth purification-rare earth-radioactivity synergistic target purification method, by " hierarchical pretreatment and microwave modification→three-stage gradient dealkalization→rare earth-radioactivity synergistic target purification→full quantization recycling" four-stage integrated process, realize red mud harmless and high-value utilization.The three-stage gradient dealkalization uses microwave-CO2-biological synergic system, after dealkalization pH≤8.0, Na2O content<1%;Rare earth-radioactivity purification is extracted by HDES and coupled with multi-ligand magnetic material system, light rare earth recovery rate≥95%, middle heavy / rare earth recovery rate≥90%, U / Th removal rate≥95%;Full quantization recycling realizes red mud total utilization rate≥98.5%, wastewater reuse rate≥95%, every ton of red mud fixed CO2≥0.2 tons.The application is suitable for various high-alkali, containing radioactive and rare earth red mud treatment, with environmental benefits and economic benefits.

The invention relates to a method for producing a gadolinium-doped cerium oxide powder comprising a cobalt oxide, the method comprising the following successive steps of: 1) preparing a wet product comprising a mixture of: - particles of gadolinium-doped cerium oxide; - water containing a cobalt complex; d) optionally, removing at least some of the water; e) calcining the product obtained in step d), or, in the absence of step d), the product obtained in step 1), in an oxygenated fluid, so as to obtain the powder.

The present invention discloses a lithium ion battery ternary positive electrode material, wherein the material is a LiNi x Co y Mn 1‑x‑y A new phase is introduced into the O2 ternary positive electrode material, wherein 0<x<1, 0<y<1; the new phase is a metal oxide, and the new phase is x Co y Mn 1‑x‑y The coherent growth of the lamellar phase in the O2 ternary cathode material. The coherent growth of the two phases in the present invention is achieved by regulating the ternary cathode material components and process parameters during the material synthesis process, thereby inducing a new phase that coexists with the lamellar phase within the bulk phase of the ternary cathode material particles. The coherent growth of the lamellar phase and the new phase within the bulk phase of the ternary cathode particles acts as a "pinning" force within the crystal, preventing crystal structure collapse caused by anisotropic volume changes during charge and discharge, thereby alleviating mechanical failure of the ternary cathode material during cycling.

The present invention relates to a composition comprising monodisperse spherical rare-earth oxide particles having an average particle size of about 20 nm to about 300 nm. The rare-earth oxide particles in this composition have a diameter D of a calculated particle size in nanometers, which can be determined by the following formula. JPEG2026509615000020.jpg16166 Here, SSA is m 2 BET specific surface area in units of / g, ρ is g / cm² 3 The density is per unit area, and the difference from the diameter of the observed particle size measured by SEM is less than approximately 25%. The rare earth particles may be Dy2O3, Ho2O3, La2O3, and Y2O3 particles. This composition has properties beneficial for ceramic and electronic applications. Furthermore, the present invention includes a manufacturing process for these particles and applications for these particles.

A composition includes monodispersed spherical rare earth oxide particles having an average particle size of from about 20 nm to about 300 nm. The rare earth oxide particles of this composition have a particle size diameter D calculated in nm of the following formula (I) wherein SSA is a BET specific surface area in m2 / g and rho is a density in g / cm3 which differs by less than about 25% from the particle size diameter observed by SEM. The rare earth particles may be Dy2O3, Ho2O3, Y2O3, and La2O3 particles. Such compositions have beneficial properties for ceramic and electronic applications. Methods for preparing these particles and uses of these particles are also included. (I)

The application provides a core-shell heterogeneous gradient structure anti-ionizing radiation powder and a preparation method and application thereof, and belongs to the field of radiation protection. The preparation method of the core-shell heterogeneous gradient structure anti-ionizing radiation powder comprises the following steps: adding a high-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a core layer; adding the core layer and a low-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a preliminary wrapped powder in which a low-atomic-number metal wraps a high-atomic-number metal core layer; adding the preliminary wrapped powder and a rare earth salt into deionized water, sequentially performing aging, washing, drying, primary calcination, secondary calcination, airflow pulverization and air rotation blowing to obtain the core-shell heterogeneous gradient structure anti-ionizing radiation powder. Through the synergy of the core-shell heterogeneous structure, high-atomic-number and low-atomic-number oxides and multiple rare earth elements, the shielding performance of the material is significantly improved.

The invention provides a nano rare earth oxide as well as a preparation process and application thereof, and relates to the technical field of nano materials. The nano rare earth oxide is prepared from the following raw materials: rare earth ions, chitosan-hexadecyl trimethyl ammonium bromide, tea saponin, nano cellulose and a hydroxyapatite nano rod; the rare earth ions are selected from at least one of cerium ions Ce < 3 + >, yttrium ions Y < 3 + >, samarium ions Sm < 3 + >, terbium ions Tb < 3 + >, lanthanum ions La < 3 + >, praseodymium ions Pr < 3 + > and neodymium ions Nd < 3 + >. The prepared nano rare earth oxide can be used as an independent antibacterial agent, can also be used as a functional filler to be compounded with a polymer, and has application potential in the fields of medical instrument coatings, food packaging and the like.

) The present invention relates to a method for producing a cobalt oxide-containing, gadolinium-doped cerium oxide powder, comprising the sequential steps of: 1) preparing a wet product comprising a mixture of gadolinium-doped cerium oxide particles and water containing a cobalt complex; d) optionally removing at least a portion of said water; e) calcining the product obtained in step d) or, in the absence of step d), the product obtained from step 1) in an oxygenated fluid to obtain said powder.

The invention relates to a photo-thermal composite phase-change material with a built-in electric field for driving heterogeneous interface electron transfer and a preparation method of the photo-thermal composite phase-change material. The preparation method comprises the following steps: adsorbing multi-element metal through a metal organic framework precursor, and performing high-temperature carbonization to construct a graphitized carbon encapsulated metal nanoparticle coupled metal oxide ternary heterogeneous interface structure carrier; a built-in electric field is induced to be generated at a heterogeneous interface by utilizing Fermi energy level difference between the metal nanoparticles and the metal oxide, and electrons are driven to be transferred between the metal nanoparticles and the metal oxide; rich oxygen vacancies in the metal oxide effectively capture electrons, and efficient and controllable photon-generated carrier separation and utilization are achieved; and a pi-pi conjugate network of graphitized carbon forms a continuous electron transmission channel, so that rapid conduction of heat is further guaranteed. The problems that a traditional composite phase change material is high in carrier recombination rate, single in photothermal conversion mechanism and insufficient in thermal management controllability are solved, and the composite phase change material has application potential in the fields of solar heat storage, industrial waste heat recovery, intelligent temperature control systems and the like.

This invention discloses a method for preparing needle-shaped lanthanum oxide and its applications, belonging to the field of nanomaterials technology. The method involves mixing a lanthanum salt solution with a urea solution and placing the mixture in a microwave-ultrasonic reaction apparatus. Microwave heating is used, followed by ultrasonic stimulation for a certain period to obtain a precursor material. The precursor material is then washed, dried, and calcined to obtain needle-shaped lanthanum oxide. The lanthanum oxide obtained by this invention is needle-shaped, uniform in particle size, and possesses a slit-mesoporous structure, exhibiting dispersion without agglomeration. The nanoneedles intertwine to form a three-dimensional network structure with a certain porosity, which not only increases the specific surface area of ​​the material but also provides more adsorption sites. The needle-shaped lanthanum oxide prepared using this method can efficiently remove fluoride and phosphorus from groundwater, broadening the applications of lanthanum and achieving low-cost removal of fluoride and phosphorus from groundwater.

The present disclosure discloses a method for preparing rare earth oxide by recycling ammonia and carbon, comprising the steps of: (1) heating raw materials containing a first rare earth carbonate and a first rare earth oxide with microwave and calcining at 500-1000° C. for 20-120 min to obtain a second rare earth oxide and carbon dioxide; (2) reacting carbon dioxide with a first ammonia water to obtain a precipitant; (3) reacting the precipitant with rare earth chloride to obtain a second rare earth carbonate and ammonium chloride wastewater. In the method, calcination time is short, rare earth recovery rate, utilization rate of ammonia and carbon resources are high. The present disclosure also provides a use of a rare earth oxide in shortening calcination time and / or increasing rare earth yield.

The invention relates to the technical field of waste recycling, in particular to a method for recycling lithium, lanthanum and cerium in rare earth waste residues through cooperation of microwave fluorine fixation and DES gradient leaching, and the method comprises the following steps: (1) microwave oxidizing roasting and fluorine fixation pretreatment are carried out, Na2O2 and Ca (OH) 2 are used as additives, Ce < 3 + > is oxidized into Ce < 4 + > at the temperature of 400 DEG C, and fluorine is cured; (2) carrying out gradient leaching by adopting a choline chloride / lactic acid eutectic solvent, and selectively leaching lithium and lanthanum step by step by regulating and controlling the pH value so as to realize ternary efficient separation of Li / La / Ce; (3) realizing metal separation and acid-base regeneration by using a nanofiltration and bipolar membrane electrodialysis coupled membrane method system, and constructing an HCl closed cycle; and (4) directionally synthesizing high-added-value products such as nano lithium iron phosphate, ultra-pure lanthanum oxide and a cerium-zirconium solid solution catalyst from the separated product. The method provided by the invention solves the problems of poor separation selectivity, heavy fluorine pollution, high energy consumption and low added value of products in the traditional process, and realizes green, low-carbon and high-value recovery of the rare earth waste residues.

The invention relates to high-dispersion nano rare earth oxide particles and a preparation method thereof, and belongs to the technical field of nano material preparation. The preparation method adopts a Uniform-ST technology and comprises the following steps: (1) adding a rare earth salt precursor and a dispersing agent A into a solvent A to obtain a rare earth salt precursor solution in a homogeneous state; (2) adding a precipitant and a dispersing agent B into a solvent B to obtain a precipitant solution in a homogeneous state; (3) respectively adding the homogeneous solution prepared in the step (1) and the homogeneous solution prepared in the step (2) into a reactor, heating to a certain temperature, controlling the feeding speed, and filtering and washing to obtain a nano rare earth oxide precursor material; and (4) drying and calcining the nano rare earth oxide precursor material obtained in the step (3) to obtain the high-dispersion nano rare earth oxide particles. The preparation method provided by the invention is simple in process, short in reaction time, high in efficiency, uniform in granularity, good in repeatability and easy to industrially popularize.

The present invention relates to a mixed oxide of titanium, niobium, and lanthanum of formula (I): LiwTi1-xLaxNb2-yM1yO7-zM2z (I) in which: 0.03 ≤ x ≤ 0.08; M1 and M2 are at least one element selected from the group consisting of V, Ta, Fe, Co, Ti, Bi, Sb, As, P, Cr, Mo, W, B, Na, Mg, Ca, Ba, Pb, Al, Zr, Si, Sr, K, Cs, and Sn; 0 ≤ w ≤ 5, 0 ≤ y < 2, and 0 ≤ z ≤ 0.3. Figure for abbreviation: [Fig. 8]

Provided are a pure inorganic stimuli-responsive sol, a preparation method therefor, and a use thereof. The sol comprises an inorganic one-dimensional nanomaterial and a solution for dispersing the inorganic one-dimensional nanomaterial. The inorganic one-dimensional nanomaterial at least comprises a rare earth metal element, and the positive charge of the rare earth metal element causes the inorganic one-dimensional nanomaterials to repel each other to form the sol. The preparation method comprises: step (1). adding an inducer to a metal salt solution while stirring to form a uniform liquid; step (2). adding a liquid to a reaction kettle for reaction; and step (3). controlling the environmental hydroxyl concentration to obtain a sol product. Further provided is a method for the stimuli-responsive conversion of a pure inorganic stimuli-responsive sol into a gel, a method for the conversion of a pure inorganic stimuli-responsive gel into a pure inorganic stimuli-responsive sol, and a use thereof in sterilization, hemostasis, wound recovery, drug carriers, medical auxiliary materials, cosmetic materials, or sunscreen products. The method has low cost, can achieve the adjustment of the interaction between one-dimensional inorganic nanomaterials without the need to replace ligands, and has extremely high advantages in stimuli-responsive sol-gel conversion capacity.

The invention discloses a La-Fe bimetal organic framework derived heterojunction material anode and a preparation method and application thereof, and belongs to the technical field of phosphorus adsorption materials. The preparation method of the La-Fe bimetal organic framework derived heterojunction material comprises the following steps: (1) mixing ferric salt, lanthanum salt, terephthalic acid and an organic solvent, and carrying out solvothermal reaction to obtain a La-Fe bimetal organic framework precursor material; and (2) carrying out calcination derivation on the La-Fe bimetal organic framework precursor material in an inert atmosphere to obtain the La-Fe bimetal organic framework derived heterojunction material. The preparation method is simple and low in cost, and the prepared La-Fe bimetal organic framework derived heterojunction material anode has the advantages of being high in adsorption capacity, high in adsorption rate, high in selectivity, wide in pH application range and the like on phosphate.

The invention discloses a method for preparing rare earth hydroxide from alkali metal hydroxide and recycling the rare earth hydroxide, which comprises the following steps: (1) mixing an alkali metal hydroxide solution and a rare earth chloride salt solution and reacting, after the reaction is finished, carrying out solid-liquid separation to obtain a precipitate and a mother solution, and washing the precipitate to obtain the rare earth hydroxide and a washing solution; (2) carrying out impurity removal and concentration on the mother liquor, and then electrolyzing to obtain an alkali metal hydroxide solution, Cl2 and H2; returning the obtained alkali metal hydroxide solution to the step (1), and recycling the alkali metal hydroxide solution as a precipitant; and (3) the Cl2 and H2 in the step (2) react to obtain hydrochloric acid, the hydrochloric acid is used for reverse extraction of the loaded organic phase to obtain a rare earth chloride salt solution, and the step (1) is returned. According to the method, the rare earth hydroxide can be obtained, and comprehensive recycling of the alkaline precipitant, the wastewater and the regenerated acid is realized.

The application discloses a preparation method of an electric contact material and an electric contact, and the preparation method comprises the following steps: adding a graphene oxide dispersion solution into a target dispersion solution to uniformly disperse, so as to obtain a graphene composite material; the target dispersion solution comprises nano copper oxide powder, nano lanthanum oxide powder and a surfactant; the graphene composite material is subjected to removal and reduction treatment, so as to remove the surfactant in the graphene composite material, and a reduced metal composite material is obtained; the metal composite material comprises graphene, copper, copper oxide and lanthanum oxide; the metal composite material is subjected to ball milling treatment, so as to obtain an electric contact composite material containing lanthanum oxide and graphene. According to the embodiment of the application, the lanthanum oxide and the graphene can be uniformly dispersed, so that the electric conductivity and the anti-welding performance of the electric contact material are effectively improved.

A chemical mechanical polishing composition for polishing a substrate having a silicon oxygen material comprises, consists of, or consists essentially of a liquid carrier, cubiform ceria abrasive particles dispersed in the liquid carrier, a self-stopping agent, and a cationic polymer.

The invention discloses a preparation method of high-purity ultrafine powder lanthanum oxide, which comprises the following steps: fully soaking and swelling sulfonic cation exchange resin in a nitric acid aqueous solution, filling the sulfonic cation exchange resin into a chromatographic column by a wet method, inputting lanthanum oxide feed liquid dissolved by nitric acid into the upper end of the chromatographic column, washing with water, and drying to obtain the high-purity ultrafine powder lanthanum oxide. And inputting the prepared mobile phase into a chromatographic column for elution, and collecting an eluent at the outlet end of the column, thereby realizing high-efficiency purification of lanthanum. And directly adding a dispersing agent and a precipitating agent into the product liquid, precipitating under a heating condition, aging under a room temperature condition, and firing to prepare the high-purity ultrafine powder lanthanum oxide. The method disclosed by the invention has the advantages of short separation time, high recovery rate and product purity and uniform powder particle size.

The application discloses a gas-liquid phase parallel flow rotating liquid film reactor and application thereof in preparation of metal hydroxide. The application is based on the basic process of preparing metal hydroxide from a gas-liquid phase precipitation method, and a gas-liquid phase multi-fluid parallel flow rotating liquid film reactor is designed through computational fluid dynamics simulation analysis, multiple gas-liquid fluid inlets are constructed, and the traditional vertical inlet is improved into tangential feeding along the rotating direction, so that the forced mixing process of the gas-liquid two phases in the reaction space is improved, the microscopic mixing and nucleation process of the reactants are strengthened, the inlet anti-overflow device is added, the upward overflow of the increased inlet flow fluid is avoided, the quality control of the product is strengthened, the efficient control of the nucleation particle size and distribution is realized, the production efficiency and product quality can be improved, the product with small particle size and narrow particle size distribution is obtained, the product particle size can be controlled in the range of 15-200 nm, and the primary particle size distribution range can be reduced to 30-60 nm.

The invention belongs to the technical field of rare earth materials, and particularly relates to a preparation method of high-purity nano rare earth oxide powder. The method comprises the following steps: dissolving a rare earth carbonate or rare earth oxide raw material with nitric acid to obtain a rare earth nitrate solution; adding the dispersing agent solution into the rare earth nitrate solution to obtain a mixed material solution; the method comprises the following steps: pumping liquid carbon dioxide, liquid ammonia and deionized water into a sieve-plate tower in a parallel flow manner to obtain a mixed precipitator; the mixed material liquid and the mixed precipitant are pumped into a supergravity reactor in a parallel flow mode to react to obtain suspension liquid; the suspension, the crystal form control agent solution and a mixed precipitator are pumped into an ultrasonic crystallization reactor in a parallel flow mode to react, and rare earth oxide precursor slurry is obtained; and carrying out solid-liquid separation, washing, drying and calcining on the rare earth oxide precursor slurry to obtain the nano rare earth oxide powder. The product obtained through the method is narrow in particle size distribution, good in dispersity, controllable in morphology and suitable for industrial production of high-added-value nano rare earth oxide materials.

The application provides a method for topological transformation synthesis of high-entropy hydroxyl oxide nanosheets, and belongs to the technical field of inorganic materials, and comprises the following steps: 1) component design: Ca2Fe2O5 brown iron ore type oxide is used as a matrix material for element doping; 2) combustion synthesis of a precursor: a low-temperature solution combustion synthesis method is used to in-situ composite the raw material of step 1), and brown iron ore type oxide powder rich in ordered oxygen vacancies is prepared by burning the obtained powder; 3) structure reconstruction: the brown iron ore type oxide powder rich in ordered oxygen vacancies obtained in step 2) is subjected to high-energy ultrasonic activation to form a high-activity ultrathin structure nanosheet, and then an ion exchange reaction is carried out to obtain the high-entropy hydroxyl oxide nanosheet electrocatalyst. Compared with traditional NiFe and CoFe hydroxide / hydroxyl oxide, the nanosheet catalyst also shows higher anti-Fe leaching capacity in the OER process. The assembled zinc-air battery can stably operate for more than 225 hours at a low charging voltage.

A chemical mechanical polishing composition for polishing a substrate having a silicon-oxygen material comprises, consists of, or consists essentially of a liquid carrier, cubic ceria abrasive particles dispersed in the liquid carrier, and a cationic polymer having a charge density of less than about 6 meq / g.

The application belongs to the technical field of rare earth materials, and particularly relates to a preparation method of high-purity nanometer rare earth oxide powder. Rare earth carbonate or rare earth oxide raw material is dissolved by nitric acid to obtain a rare earth nitrate solution; a dispersant solution is added into the rare earth nitrate solution to obtain a mixed liquid; liquid carbon dioxide, liquid ammonia and deionized water are pumped into a sieve plate tower in parallel flow to obtain a mixed precipitant; the mixed liquid and the mixed precipitant are pumped into a high gravity reactor in parallel flow to obtain a suspension; the suspension, a crystal form control agent solution and the mixed precipitant are pumped into an ultrasonic wave crystallization reactor in parallel flow to obtain a rare earth oxide precursor slurry; the rare earth oxide precursor slurry is subjected to solid-liquid separation, washing, drying and calcination to obtain the nanometer rare earth oxide powder. The product obtained by the method has narrow particle size distribution, good dispersibility and controllable morphology, and is suitable for industrial production of high-value nanometer rare earth oxide materials.

The invention provides a Gd-doped and La-coated co-modified lithium ion battery ultrahigh nickel ternary positive electrode material and a preparation method and application thereof.The preparation method comprises the following steps that S1, a nickel, cobalt, manganese and gadolinium hydroxide (Ni < x > Co < y > Mn < z >) < 1-w > Gdw (OH) < 2 > precursor is prepared, x is larger than 0.9 and smaller than 1, and y < lt; 1, 0lt; zlt, zlt; 1, 0lt; w < 1; s2, preparing a gadolinium-doped ultrahigh nickel ternary positive electrode material Li (Ni < x > Co < y > Mn < z > O < 2 >) < 1-w > G < dw > O < 2 >; and S3, coating La2O3 on the surface of the gadolinium-doped ultrahigh nickel ternary positive electrode material Li (Ni < x > Co < y > Mn < z > O < 2 >) < 1-w > Gd < w > O < 2 > to obtain the positive electrode material. The Gd-doped and La-coated synergistically-modified ultrahigh-nickel ternary positive electrode material remarkably improves the electrochemical cycle performance and rate performance of a lithium ion battery, and a synthesis strategy with important reference value is provided for the positive electrode material with ultrahigh nickel content, high reversible capacity and poor cycle performance and rate performance.

A chemical mechanical polishing composition for polishing a substrate having a silicon-oxygen material comprises, consists of, or consists essentially of a liquid carrier, cubic ceria abrasive particles dispersed in the liquid carrier, and a cationic polymer having a charge density greater than about 6 meq / g.