52 results about "Lanthanum Ion" patented technology

The invention discloses a preparation method and application of samarium-doped lanthanum ferrite nanofibers, and the preparation method is a design thought based on synergistic interaction of'defect engineering 'and'morphology control': samarium (Sm) ions with a specific proportion are creatively introduced to the A site of LaFeO3, and lattice distortion is induced by utilizing radius mismatch between the samarium (Sm) ions and lanthanum (La) ions; therefore, high-concentration gas-sensitive active sites (oxygen vacancies) are generated in the intrinsic structure of the material; and the material is constructed into a one-dimensional nanofiber network with a high specific surface area through an electrostatic spinning technology, so that the exposure efficiency of active sites is maximized.

The invention relates to the technical field of organic synthetic chemistry, in particular to a preparation method of ethyl 2-n-butyl acetoacetate, which comprises the following specific steps: S1, preparation of a composite solid base catalyst, S2, synthesis of ethyl 2-n-butyl acetoacetate, S3, post-treatment of a reaction solution, and S4, separation and purification of a product. The preparation method has the following beneficial effects that the magnesium-aluminum composite oxide is used as a carrier, and the composite solid base catalyst loaded with potassium and lanthanum has relatively high catalytic activity and selectivity; the magnesium-aluminum composite oxide carrier has a relatively large specific surface area and rich alkaline sites, so that a good catalytic environment is provided for the reaction; as a main active component, potassium ions can effectively activate alpha-active methylene of ethyl acetoacetate and promote formation of negative ion intermediates; the introduction of lanthanum ions can adjust the electronic structure of the catalyst, enhance the stability of the active center and inhibit the occurrence of side reactions.

The invention relates to the technical field of fuel cell new materials and new energy, in particular to an A-site high-entropy perovskite cathode material and a preparation method thereof. According to the technical scheme, the material comprises the following raw materials: Pr (NO3) 3.6 H2O, La (NO3) 3.6 H2O, Co (NO3) 2.6 H2O, CaCO3, BaCO3, SrCO3 and citric acid. The molar ratio of the praseodymium ions to the lanthanum ions to the cobalt ions to the calcium ions to the barium ions to the strontium ions to the citric acid is 1: (1-2). According to the invention, the A site of the perovskite material is doped with a plurality of elements, a rapid quenching preparation process is combined, the oxygen vacancy concentration and the proton conduction path can be optimized, the ORR activity and the conductivity can be improved, and excellent electrochemical performance and thermal stability can be shown through the synergistic effect of the plurality of elements and structural regulation and control, so that the performance of the cell can be improved.

This invention discloses a heavy metal-free water-based anti-rust primer, its preparation method, and its application, relating to the field of water-based metal anti-corrosion coatings. The primer comprises a modified acrylic copolymer emulsion, a modified zinc phosphate-aluminum tripolyphosphate composite pigment, a diatomaceous earth composite filler, and a lignin sulfonate-grafted polycarboxylic acid dispersant. The modified acrylic copolymer emulsion is prepared by copolymerizing four monomers and then modifying them with epoxy silane and amino silane. The modified zinc phosphate-aluminum tripolyphosphate composite pigment is prepared by rare earth lanthanum ion loading and synergistic modification with a dual coupling agent. The diatomaceous earth composite filler is prepared by high-temperature activation, composite with nano-silica, and silane modification. Through the synergistic effect of its components, this invention significantly improves the primer's adhesion, resistance to damp heat, high temperature, kitchen fumes, weak acid resistance in food, and resistance to alkaline media in the kitchen, making it suitable for corrosion protection of various metal components in kitchens and commercial kitchens.

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.

This invention belongs to the field of rubber antioxidant technology, and specifically relates to an anti-caking composite rubber antioxidant 6PPD and its preparation method. The anti-caking composite rubber antioxidant 6PPD is prepared by reacting 3-aminoadipic acid with 4-pentenyl isothiocyanate, grafting it onto silica using a silane coupling agent, and complexing it with lanthanum ions to obtain a functional antioxidant. This functional antioxidant is then compounded with a base antioxidant N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, microcrystalline wax, and an antioxidant to prepare the anti-caking composite rubber antioxidant 6PPD. The prepared anti-caking composite rubber antioxidant 6PPD possesses multiple protective mechanisms—chemical protection, physical barrier, and multi-mechanism synergy—exhibiting excellent aging resistance, good processability, and easy storage due to its anti-caking properties.

The application discloses a method for improving the performance of oxide solid electrolyte by calcium doping, and belongs to the technical field of solid-state batteries. The method comprises the following steps: mixing raw materials containing a calcium source, a sodium source, a rare earth source and a phosphorus source to obtain a precursor; sintering the precursor to obtain a calcium-doped sodium superionic conductor precursor; and performing ion exchange on the precursor and a lithium salt to obtain a calcium-doped oxide solid electrolyte with a chemical formula of Li 3+ x La 1‑x Ca x (PO4)2, and 0 < x <= 0.1. By partially replacing lanthanum ions with calcium ions, lithium vacancies are introduced, the crystal lattice is relaxed, and the lithium ion migration path is optimized by using the charge compensation mechanism, so that the room-temperature ionic conductivity of the material is significantly improved. The method has low raw material cost, simple process and strong universality, can be expanded to various oxide solid electrolyte systems such as NASICON and garnet, and has good application prospect in the field of solid-state lithium ion batteries.

The invention discloses a preparation method and application of benzenetricarboxylic acid isomer modified chitosan, and the preparation method comprises the following steps: step 1, respectively dissolving trimesic acid, trimellitic acid and trimellitic acid in a sodium hydroxide solution to obtain a benzenetricarboxylic acid solution; 2, dissolving chitosan with an acetic acid solution to obtain a chitosan mixed liquid; 3, slowly adding the benzenetricarboxylic acid solution obtained in the step 1 into the chitosan mixed liquid obtained in the step 2, and continuously stirring to react until a white gel material is formed; and 4, filtering the white gel material prepared in the step 3, washing to be neutral, and drying to obtain the adsorbent. The three adsorbents prepared by the invention all have unique space structures and surface chemical characteristics, and anionic polymer chains of the adsorbents are rich in carboxyl, carbon-carbon double bonds, carbonyl and other functional groups, so that high-selectivity adsorption of rare earth metal lanthanum ions can be realized, and the adsorbent is suitable for recognition, separation and recovery of lanthanum ions in water with complex components.

The invention discloses silicon-germanium fluorescent powder prepared from germanium tetrafluoride and application of the silicon-germanium fluorescent powder in an LED (light-emitting diode), and relates to the technical field of luminescent materials. The general chemical formula of the silicon-germanium fluorescent powder is Ca2 (Si < 0.6 > Ge < 0.4 >) O4: xLa < 3 + >, yEr < 3 + >, zYb < 3 + > (at) ZrO2-TiO2, wherein x is in the range of 0.015 to 0.017; y is in the range of 0.003 to 0.005; and z ranges from 0.025 to 0.03. By introducing ytterbium ions, lanthanum ions and other ions and the ZrO2-TiO2 coating layer, the fluorescence lifetime, the thermal stability and the chroma stability of the silicon-germanium fluorescent powder are effectively improved; and the silane coupling agent KH-570 is used for surface modification and fluidized bed grading treatment, so that the fluorescence lifetime, the thermal stability, the chroma stability and the moisture resistance of the silicon-germanium fluorescent powder are further improved. Therefore, the silicon-germanium fluorescent powder disclosed by the invention has a wider application prospect in the LED.

This invention discloses a preparation method and application of a composite adsorbent based on iron and steel smelting dust, belonging to the field of environmental functional materials and heavy metal wastewater treatment technology. This invention proposes a synergistic modification strategy of "hierarchical enrichment – ​​low-temperature plasma activation – iron-lanthanum gradient doping – lattice vacancy hierarchical regulation – molding and solidification": firstly, the active components in the dust are concentrated and enriched through sieving, gravity classification, and magnetic selection; then, nanopores are etched and functional groups are introduced through low-temperature plasma activation to provide iron-lanthanum ion loading sites; a Fe-La stepwise equal-volume impregnation process is used to construct Fe-La-Mn ternary active centers in combination with Mn in the iron and steel smelting dust, and calcination is performed to form a multi-element heterojunction, La... 3+ With Ca in dust 2+ Lattice coordination lowers the formation energy barrier of oxygen vacancies; gradient oxidation-reduction treatment generates shallow and deep oxygen vacancies in stages, driving in-situ oxidation of As(III) and electron replenishment, respectively; finally, molding and solidification yields spherical adsorbents with a mechanical strength ≥16 N / particle. This invention enables the high-value utilization of iron and steel smelting dust, and the adsorbent is easy to recover and produces no secondary pollution, making it suitable for the deep treatment of arsenic-containing heavy metal wastewater.

The present invention discloses a synthesis method for a layered dimetal-based nano lanthanum material capable of synchronously locking phosphorus, removing algae, and reducing turbidity, and the use thereof, and belongs to the field of environmental functional materials. In the present invention, a synthesis method includes: synthesizing LDHs by means of a single-drop coprecipitation method; filtering out an obtained product, washing the product with distilled water and drying; then adding the product to an alcohol solution of a lanthanum salt at certain concentration, and stirring for reaction; precipitating lanthanum ions in situ by adjusting a pH value of the solution; filtering out the reaction precipitate, washing the precipitate with an alcohol, and drying the precipitate to obtain an LDH-based nano lanthanum material.

The application discloses a preparation method of a Ce(OTf)3-MOF-303@GO composite adsorption material and application thereof, and sequentially comprises the following steps: graphene oxide preparation, Ce(OTf)3 / GO composite preparation, aluminum-based metal organic framework MOF-303 preparation and Ce(OTf)3-MOF-303@GO composite adsorption material preparation. The composite adsorption material prepared by the application can be used as an adsorbent for adsorbing lanthanum ions in a rare earth system, and has the advantages of low adsorbent dosage, short adsorption equilibrium time and the like. Meanwhile, the material has the advantages of simple preparation process, low energy consumption, high adsorption efficiency after repeated use, good environmental benefits and wide application prospect.

The invention discloses a lanthanum ion doped oxygen calcium yttrium borate nonlinear optical crystal material and a preparation method thereof, the lanthanum ion doped oxygen calcium yttrium borate nonlinear optical crystal material belongs to a monoclinic system, the space group is Cm, the chemical formula is La0.1: Y0. 9Ca4O (BO3) 3, the frequency multiplication coefficient is 2 * KDP, the ultraviolet cut-off edge is less than 200 nm, and no absorption peak with the intensity greater than or equal to 0.2 cm <-1 > exists in the range of 200-2500 nm. Therefore, the lanthanum ion doped yttrium calcium oxide borate crystal can be used as a nonlinear optical material with a wide application prospect in the field of optical parameter chirped pulse amplification.

This invention belongs to the field of polymer composite materials technology, specifically relating to a method for preparing and applying an antibacterial agent for ABS composite materials. The method involves reacting lanthanum acetate, sodium carbonate, anhydrous ethanol, and deionized water in a reactor to obtain solution A. Solution A is then filtered, washed, dried, and cooled to obtain lanthanum carbonate. The lanthanum carbonate is then calcined to obtain lanthanum oxide. Lanthanum oxide, linalool, 3-isocyanopropyltrimethoxysilane, anhydrous ethanol, and deionized water are reacted to obtain an antibacterial agent of the linalool / 3-isocyanopropyltrimethoxysilane / lanthanum oxide type. This antibacterial agent is then used in ABS to prepare antibacterial ABS composite materials. The antibacterial agent of this invention inhibits the metabolic activity of bacteria by interfering with their respiratory chain function. Furthermore, lanthanum ions, with their high positive charge density, adsorb onto the bacterial cell membrane surface, disrupting normal cellular physiological functions and thus killing the bacteria.

The application discloses a novel Bao Lan matt glaze for medium-temperature pottery, and belongs to the technical field of glaze materials, which is prepared from the following raw materials: matt frit 45-50 parts, antibacterial silicon powder 15-20 parts, Guizhou soil 5-8 parts, bright frit 10-15 parts, barium carbonate 4-6 parts, strontium carbonate 1-2 parts, ultrafine aluminum powder 3-6 parts, zirconium silicate treated by titanate coupling agent 1-2 parts, gemstone blue colorant 8-12 parts and talc powder 15-20 parts. The antibacterial silicon powder uses zinc ions as antibacterial ions and rare earth lanthanum ions as synergistic ions to improve the antibacterial effect, and compared with the conventional use of nanometer silver antibacterial, the antibacterial particles in the application are not prone to discoloration, the introduction of the lanthanum element as a sintering raw material can reduce the porosity of the ceramic surface, and in the high-temperature processing process, the base body is caused to react to generate a liquid phase, the compactness of the product surface is improved, and surface defects are reduced.

The invention relates to the technical field of adsorbents, in particular to a 13X molecular sieve adsorbent and a preparation method thereof. The preparation method comprises the following steps: firstly, performing lanthanum ion replacement treatment on 13X molecular sieve raw powder, then generating an MFI molecular sieve coating layer on the surface of the 13X molecular sieve raw powder, etching by using sodium hydroxide to prepare a mesoporous structure, and then performing hydrophobic modification treatment on the mesoporous structure, so that water molecules are difficult to adsorb by the molecular sieve raw powder and mesoporous surfaces thereof due to a methyl group on the surface, and the molecular sieve raw powder and the mesoporous surfaces are not easy to adsorb; hydrogen bond connection cannot be formed, so that a rapid'adsorption-diffusion 'transfer process cannot be realized in molecular sieve raw powder, the polarity of carbon dioxide is far smaller than that of water molecules, the carbon dioxide cannot be repelled by methyl, and the diffusion of the carbon dioxide in mesopores is far higher than that in micropores due to the existence of the mesopores. Therefore, the carbon dioxide flux in the molecular sieve raw powder is effectively improved, and the carbon dioxide adsorption rate of the molecular sieve raw powder is improved.

This application relates to the field of coating compositions, specifically disclosing an environmentally friendly epoxy coating that is phosphorus-free and resistant to salt spray for 1000 hours and its preparation method, comprising component A and component B, including the following raw materials in parts by weight: epoxy resin 35-40 parts, n-butanol 2-2.5 parts, xylene 5-5.5 parts, dispersant 0.1-0.5 parts, iron oxide red 10-12 parts, heavy calcium carbonate 4-6 parts, zinc oxide 2-4 parts, rust-inhibiting silica powder 4-6 parts, kaolin 4-6 parts, talc powder 3-4 parts, rust-inhibiting pigment 7-8 parts, precipitated barium sulfate 12-15 parts, petroleum resin 4-5 parts, leveling agent 0.02-0.06 parts; curing agent 12-15 parts, n-butanol 1-2 parts, xylene 1-1.5 parts, dispersant 1-3 parts, mica iron oxide 0.4-0.6 parts; talc powder including one or more of calcium ion exchange talc powder, cerium ion exchange talc powder, and lanthanum ion exchange talc powder. The coating in this application is environmentally friendly, phosphorus-free, and has good salt spray resistance.

The invention belongs to the technical field of antitumor drugs, and particularly relates to a lanthanide / transition metal ion coordination nano-enzyme as well as a preparation method and application thereof. The lanthanum ion / copper ion nano enzyme is formed by coordination of lanthanum ions, copper ions and inhibitors Lap and IWR-1, has SOD (superoxide dismutase), POD (peroxidase) and GSH-Px triple mimic enzyme activity, can respond to tumor microenvironment degradation and release active ingredients, synergistically reverses copper death resistance and induces comprehensive death of tumor cells, and is simple and efficient in preparation method, uniform in nano enzyme size, good in biological safety and suitable for industrial production. Wide application prospects are realized in the field of anti-tumor medicines.

The invention relates to a preparation method and a preparation system of quinclorac, and belongs to the technical field of herbicide preparation, AuPd alloy nanoparticles are loaded on a lanthanum-doped CsPMo composite carrier, a'Lewis acid site + electron-rich metal active center 'synergistic system is constructed, lanthanum ions are embedded into Keggin structural gaps of CsPMo through ionic bonds or coordinate bonds, and the quinclorac is prepared. The specific surface area of the composite carrier is remarkably increased, the number of Lewis acid sites is increased, electron metal-composite carrier interaction between an AuPd alloy and the composite carrier induces electrons to be transferred from the carrier to the alloy, an electron-rich active center is formed, an oxygen activation energy barrier is reduced, oxygen ion active oxygen species are efficiently generated, and the catalytic activity of the AuPd alloy is improved. Meanwhile, hydrogen is accelerated to be dissociated into active hydrogen species, sufficient active species are provided for oxidation reaction and reduction reaction respectively, and efficient promotion of methyl oxidation, nitro reduction and subsequent ring closing reaction of 1-chloro-2-methyl-3-nitrobenzene is ensured.

The invention designs a biosynthetic hydroxyapatite-based protein kinase B (Akt1) electrochemical sensor which is applied to Akt1 activity analysis in a skin cell aging process. Hydroxyapatite is biologically synthesized through bacillus subtilis and is uniformly deposited on the surface of a glassy carbon electrode by utilizing a potentiometric deposition method. The surface of the material contains rich phosphate groups and hydroxyl groups, can be combined with lanthanum ions, and provides a good interface for subsequent sensor detection. In order to detect the activity of Akt1, a substrate polypeptide containing three phosphorylation sites is designed. The Akt1 is subjected to phosphorylation of a substrate polypeptide, negative charges are increased, combination of the Akt1 and lanthanum ions on the surface of the electrode is enhanced, the impedance on the surface of the electrode is increased, and the activity of the Akt1 is reflected. And the unphosphorylated substrate polypeptide cannot be effectively attached and shows a relatively small impedance value. The accuracy of the sensor is verified by adopting an Akt1 inhibitor MK-2206. Human skin fibroblasts (GNHu49) are taken as a model, and research finds that the activity of Akt1 in senescent cells is remarkably reduced, so that an experimental basis is provided for researching the activity change of Akt1 and the change of cell functions in the skin senescence process. The invention provides a new technical means for skin aging research, anti-aging drug evaluation and cosmetic technology.

The application discloses a microwave dielectric ceramic material, a preparation method and application thereof. The microwave dielectric ceramic material comprises a main crystal phase and a doping cation. The chemical formula of the main crystal phase is Mg(Ti2O5) x -Mg(Al2O4) (1‑x) wherein 0.17<=x<=0.26; the doping cation comprises at least one of barium ions, calcium ions, zinc ions, lanthanum ions, niobium ions and bismuth ions; the barium ions and the calcium ions replace magnesium ions in the main crystal phase, and the zinc ions, the lanthanum ions, the niobium ions and the bismuth ions replace magnesium ions, aluminum ions or titanium ions in the main crystal phase; the magnesium ions, the aluminum ions and the titanium ions in the main crystal phase are replaced by the barium ions, the calcium ions, the zinc ions, the lanthanum ions, the niobium ions and the bismuth ions, so that the crystal lattice in the main crystal phase is distorted, the final synthesis temperature is reduced, the dielectric constant and the volume temperature coefficient are adjusted, the dielectric loss is reduced, and the comprehensive performance of the microwave dielectric ceramic material is improved.

This invention provides a lanthanum carbonate pharmaceutical composition and its application in the treatment of hyperphosphatemia, belonging to the field of pharmaceutical technology. The lanthanum carbonate pharmaceutical composition provided by this invention comprises lanthanum carbonate and ethylenediaminetetraacetic acid (EDTA)-crosslinked β-cyclodextrin, wherein the mass ratio of lanthanum carbonate to EDTA-crosslinked β-cyclodextrin is 1:0.2–5.0. The lanthanum carbonate pharmaceutical composition provided by this invention can reduce or even block the absorption of lanthanum ions into the bloodstream without affecting the phosphorus-lowering effect of lanthanum carbonate. Test results show that lanthanum carbonate granules prepared using the lanthanum carbonate pharmaceutical composition provided by this invention, compared with commercially available lanthanum carbonate granules, can prevent the absorption of lanthanum ions into the bloodstream, thus solving the problem that while lanthanum carbonate exerts its phosphorus-lowering effect in the gastrointestinal tract, trace amounts of lanthanum ions are still absorbed into the bloodstream, causing lanthanum accumulation in the body and bone poisoning.

The invention discloses a high-performance Raney nickel net oxygen evolution electrode based on time sequence step-by-step chemical conversion. The high-performance Raney nickel net oxygen evolution electrode is obtained by sequentially constructing an interface stable layer on a substrate Raney nickel net through a step-by-step chemical impregnation method and then growing a catalytic functional layer, the interface stable layer precursor solution comprises at least one of cerium ions, lanthanum ions and yttrium ions; the catalytic functional layer precursor solution comprises main active metal ions and coordinated regulation element ions, the main active metal ions comprise nickel ions and iron ions or nickel ions and ferrous ions, and the coordinated regulation element ions comprise at least one of cobalt ions, manganese ions and vanadium ions. The Raney nickel net oxygen evolution electrode has a gradient composite structure in which the interface stable layer and the catalytic functional layer are tightly combined, the microstructure, the macroscopic performance and the long-term stability are remarkably optimized, and the preparation process is suitable for industrial large-scale production; and a feasible solution is provided for the technical bottleneck restricting the development of the industrial oxygen evolution electrode.

The invention relates to the technical field of materials, in particular to a hydrothermal reaction system of nanofibers as well as a preparation method and application of the hydrothermal reaction system. The reaction system comprises: a calcium source containing calcium ions; a phosphorus source containing phosphorus ions; a doping source containing lanthanum ions; the invention discloses a structure-directing agent capable of being selectively adsorbed on a hydroxyapatite crystal face under an alkaline condition and inducing one-dimensional directional growth. And an alkaline regulator. According to the preparation method disclosed by the invention, crystallization growth is directly carried out under a hydrothermal condition, and a high-temperature calcination step is not needed, so that the problems of fiber breakage, fusion and morphology collapse caused by macromolecular template decomposition and rapid crystal sintering are fundamentally avoided. The prepared nanofiber has ideal morphology with good continuity, uniform diameter and high length-diameter ratio, and can simulate the microstructure of natural collagen fiber more truly, thereby providing a more excellent biological microenvironment for cells.

The application relates to the technical field of polyvinyl chloride, and discloses a wear-resistant and aging-resistant PVC material, which is filled and modified by using glycidyl acrylate grafted ABS as a compatilizer, carboxyl-terminated butyronitrile rubber as a toughening agent and wear-resistant modifier, and polyvinyl chloride. The epoxy groups in the glycidyl acrylate grafted ABS can react with the carboxyl groups at the ends of the butyronitrile rubber, so that the butyronitrile rubber has better compatibility with the polyvinyl chloride, and the notched impact strength and wear resistance of the PVC material are improved. The hindered phenol-lanthanum complex stabilizer contains a hindered phenol structure which can capture free radicals generated in the oxidation process, inhibit the free radical chain reaction, and overcome the decomposition of the polyvinyl chloride; meanwhile, the lanthanum ions in the complex can react with hydrogen chloride generated by the thermal decomposition of the polyvinyl chloride, so that the phenomenon that the hydrogen chloride degrades the polyvinyl chloride is reduced.

This invention relates to a hexagonal basic lanthanum carbonate and its preparation method, belonging to the field of rare earth compound technology. It addresses at least one of the problems of existing methods for synthesizing hexagonal basic lanthanum carbonate, including the presence of impurity phases in the product, dependence on high-temperature and high-pressure synthesis conditions, high cost and energy consumption, long reaction cycles, and low production efficiency, which are unfavorable for large-scale continuous production. This invention uses a lanthanum salt solution and a mixed precipitant, controlling the molar ratio of NH3·H2O and ammonium bicarbonate in the mixed precipitant, as well as the ratio of the total amount of NH3·H2O and ammonium bicarbonate added to water to the amount of lanthanum ions, to carry out the precipitation reaction and aging. Under normal pressure and mild conditions, a single-phase hexagonal basic lanthanum carbonate is prepared, avoiding the high energy consumption and safety hazards caused by high-temperature and high-pressure conditions. The process is simple and suitable for large-scale production.

The invention relates to the technical field of nano materials, in particular to a preparation method of a composite nano lubricating oil additive, which is prepared from the following raw materials in parts by weight: 85 to 92 parts of composite nano particles, 6 to 8 parts of dispersing agent, 4 to 6 parts of extreme pressure anti-wear agent, 2 to 4 parts of antioxidant, 0.5 to 3 parts of nano copper powder, 0.3 to 0.8 part of oleic acid, 1 to 2 parts of clearing agent and 0.2 to 0.4 part of defoaming agent. According to the invention, cracks are filled through physical filling of nano copper powder, corrosion is inhibited, self-repairing is realized, in addition, the composite nanoparticles are uniformly dispersed through strong chelation of lanthanum ions and oleic acid carboxyl, sulfydryl on the surfaces of the composite nanoparticles can further react with metal oxide to generate a ferrous sulfide film, and the self-repairing effect is improved. And a self-repairing network with complementary functions is formed with a copper sulfide film of the nano copper powder, and the self-repairing function is enhanced through cooperation of multiple mechanisms.

A single-mode excitation color-changing luminescent upconversion material, and its preparation method are provided. The molecular formula of the single-mode excitation color-changing luminescent upconversion material is AxMOCly-1:Yb / Ln, where A is at least one of Lithium(I) ion (Li+), Sodium(I) ion (Na+), Sodium(I) ion (K+), or Cesium(I) ion (Cs+); M is at least one of Lanthanum(III) ion (La3+), Yttrium(III) ion (Y3+), Gadolinium(III) ion (Gd3+), or Lutetium(III) ion (Lu3+); Ln is at least one of Erbium(III) ion (Er3+), Holmium(III) ion (Ho3+), or Holmium(III) ion (Tm3+), with 1≤x≤4 and 4≤y≤7. The excitation wavelength range of the material is 950 nanometers (nm)-1100 nm, and the emission wavelength range is 400 nm-800 nm. Under single-mode near-infrared excitation, the material exhibits color-changing upconversion luminescence.

The invention relates to application of rare earth oleate in catalyzing L-lactic acid to prepare L-lactide, and belongs to the technical field of chemical synthesis. The chemical formula of the rare earth oleate is REL3, and RE is selected from one or more of lanthanum ions, neodymium ions, samarium ions, ytterbium ions and yttrium ions; l is oleate; the L-lactide can be prepared from the rare earth oleate through a one-step method, the technological process is simple, the reaction condition is mild, the energy consumption is low, the yield of the prepared L-lactide can reach 93%, the selectivity reaches up to 99%, and the purification difficulty of the L-lactide is reduced.

The application discloses a kind of composite rare earth additive for electrolytic copper foil and its application, belong to electrolytic copper foil technical field.The composite rare earth additive is by weight 1-50 parts of cerium ion, 2-40 parts of yttrium ion, 5-30 parts of lanthanum ion Composition, also provides its application in the preparation of electrolytic copper foil, the corresponding concentration of rare earth element in the electrolyte of the electrolytic copper foil is respectively cerium ion 1-50 mg / L, yttrium ion 2-40 mg / L, lanthanum ion 5-30 mg / L.The composite rare earth additive for electrolytic copper foil provided by the application can effectively refine the grain of electrolytic copper foil, optimize grain orientation, while increasing the number of twin crystal and dispersion precipitated phase, so as to improve the tensile strength and elongation of electrolytic copper foil.