41 results about "Mixed valent" patented technology

A memory using a mixed valence conductive oxides. The memory includes a mixed valence conductive oxide that is less conductive in its oxygen deficient state and a mixed electronic ionic conductor that is an electrolyte to oxygen and promotes an electric field effective to cause oxygen ionic motion.

The invention relates to a method for preparing controllable-morphology-and-size mixed-valence tungsten-based nanoparticles, belonging to the field of the preparation of inorganic oxide materials. The method comprises the steps of dissolving a tungsten source into organic straight-chain alcohol, mixing uniformly under magnetic stirring, then, transferring a solution to a reactor for crystallization reaction, and carrying out centrifugation, washing and vacuum drying on a powder sample after reaction, thereby obtaining a powder sample. According to the method, the synthesis steps are simple, and the obtained particles are uniform, are controllable in morphology and size and have excellent and stable near-infrared ray absorbing performance. According to the sample prepared by the method, the sample is a monoclinic-phase W18O49 nanocrystal, the size can be regulated and controlled between 50nm and 2,000nm, the form is uniform, the morphology can be nanowires, nanospheres, fusiform nanoparticles and columnar nanoparticles, and the chemical valence is of the coexistence of +4, +5 and +6. In addition, the sample prepared by the method has relatively strong near-infrared ray absorbing capacity.

The invention relates to a method for preparing a mixed-valent-state iron doped zeolite imidazate skeleton nano-material. The method comprises the steps of simultaneously dispersing bivalent and trivalent iron salts and zinc nitrate into a methanol solvent to form an iron-zinc precursor solution, mixing a 2-methylimidazole methanol solution with the precursor solution, placing the mixture in an oil bath with the temperature of 40 DEG C to 100 DEG C, carrying out a sustained magnetic stirring reaction, and then, subjecting a product to centrifugation, washing and drying treatment, thereby obtaining the mixed-valent-state iron doped zeolite imidazate skeleton nano-material. The mixed-valent-state iron doped zeolite imidazate skeleton nano-material with relatively high yield and uniform and controllable particle size is obtained. According to the method disclosed by the invention, the total iron doped amount can reach 50% to the maximum through adjusting a ratio of bivalent iron salts totrivalent iron salts, and conversion ratios of zinc ions and iron ions can separately reach up to 78% and 60%. The method is simple and economical, and reacted mother liquor can be reused. The obtained nano-material has a relatively high active oxygen generating efficiency under ultrasonic induction, has a tremendous application value in degradation of environmental pollutants and sonodynamic therapy of tumors and can be applied to preparation of high-concentration monoatomic iron-carbon based catalysts.

Methods and compositions for reduction of contaminants using manganese-based octahedral molecular sieves.

The invention discloses mixed-valence-state europium (Eu) ion doped single-matrix color-adjustable fluorescent powder and a preparation method thereof. An expression formula of the chemical composition of the fluorescent powder is Ca2-xEuxSiO2F2, wherein Eu is an active ion, and is in +2 and +3 mixed-valence state; x is a molar percentage coefficient accounted by the active ion Eu relative to an alkaline earth metal ion Ca, and x is more than or equal to 0.001 and less than or equal to 0.10; according to the fluorescent powder, the active ion Eu is doped into a matrix Ca2SiO2F2, and under the condition that the matrix Ca2SiO2F2 can be effectively activated by near-ultraviolet light, adjustable emission of a fluorescent powder material from blue light to orange red light can be achieved by changing the doping concentration of the active ion Eu and adjusting the emission peak ratio of the blue light of bivalent Eu ions to red light of trivalent Eu ions; and specifically, with the increase of Eu ion doping concentration, the relative strength of red light emission of Eu<3+> can be increased, and the light emitting color of Ca2-xEuxSiO2F2 is gradually changed from blue to white, and is continuously changed to orange.

The invention relates to tungsten-molybdenum-based superfine composite oxide solid solution and a preparation method thereof. The preparation method is characterized in that: ammonium molybdate and tungstic acid are used as main raw materials, and meanwhile a surfactant is added into the raw materials so as to disperse the system more uniformly and facilitate the formation of more stable solid solution; and deionized water is used as a medium, oxalic acid and hydrazine hydrate are used as reducing agents, and the solid solution with good conductive performance and thermal stability is obtained through reduction reaction. The volume resistance of the tungsten-molybdenum-based superfine composite oxide solid solution is 0.01 to 0.001 ohm per centimeter, and the anti-oxidation temperature is310 DEG C, so the thermal stability and the application range of the mixed-valent conductive material are greatly improved. The method has the advantages of quick reaction, no any waste discharge, simple process, high product purity, low energy consumption and the like, and meets the requirements of low-carbon economy and sustainable development economy strategies.

The invention relates and provides a Ti<3+>/Ti<4+> mixed-valence lithium titanate negative electrode material doped with an iron element and a preparation of the negative electrode material. The chemical formula of the negative electrode material is Li<4>Ti<5-x>Fe<x>O<12-y>, wherein x is more than 0 but less than 1, and y is more than 0.01 but less than 0.5. A solid phase synthesis method is adopted, iron powder is taken as a reducing agent and a doping agent, the Ti<3+>/Ti<4+> mixed-valence lithium titanate negative electrode material doped with iron ions is prepared by a one-step solid phase method under the protection of an inertia gas, and a part of Ti<4+> is reduced to Ti<3+> by the reducing agent. The conductivity of an electrode is improved due to mixed valence generated by spinelle material lithium titanate, thus, the charge impedance is reduced, and the polarization of the electrode is reduced.

The invention belongs to the field of inorganic nonmetal functional ceramic powder materials, and particularly relates to a method for realizing synthesis and sintering integration of a metastable-state mixed-valence rare earth iron-based oxide ceramic material through a sintering technology for triggering synchronous reaction of a precursor by using pressure and discharge breakdown under a metastable-state or unbalanced condition. Through cooperative regulation and control of applied current and pressure, and in combination with sintering mold design, sintering time control and precursor character control, accurate regulation and control of nucleation and growth characteristics of the metastable phase material system can be realized, and the physical properties of the synthesized ceramic material are further regulated and controlled. The prepared block material has the temperature-induced charge ordered transition characteristic, multiferroic property, thermistor characteristic and piezoresistor characteristic; the material has considerable application value in preparation of functional electronic devices, sensors, thermistors, magnetic sensing devices and the like.

The invention discloses a frame compound catalyst material containing mixed valence Cu, the chemical formula is {[Cu3(H2O)6(SQPA)2(bipy)]2bipy](b).(/b)4H2O}n, wherein n is greater than 1. The preparation method of the catalyst material is as follows: step one, dissolving an organic ligand in a mixed solution of water and organic solvent to obtain a solution A; step two, adding copper source and 4,4'-dipyridyl into the solution A, uniformly stirring to obtain a solution B; step three, stirring the solution B by using a magnetic stirrer at normal temperature and pressure, and the regulating pH value to obtain a precursor solution C; step four, transferring the precursor solution C into a reaction kettle to react, cooling after reaction, collecting the crystal, washing and drying to obtain a blue crystal metal organic frame compound catalyst material. The catalyst material has good heat stability and catalysis and can be recycled.

The invention discloses a high-activity ozonolysis manganese-based catalyst and a preparation method thereof. The catalyst is mixed valence state manganese oxide manganous-manganic oxide with a spinel structure. The preparation method comprises the following steps: mixing a divalent manganese source, ammonium persulfate and deionized water, fully stirring, and keeping the obtained mixture for 4-8 hours under the hydrothermal condition of 70-140 DEG C, wherein the molar ratio of the divalent manganese source to the ammonium persulfate is 1: (0.5-2); and drying a solid, obtained by filtering, at 60-110 DEG C for 3-12 hours, and finally roasting at 200-400 DEG C in a reducing atmosphere for 4-8 hours. The ozone decomposition catalyst with efficient catalytic activity under the conditions of high humidity and low ozone concentration is obtained, meanwhile, the valence state and the type of the manganese-based ozone catalyst are enriched, and the application of manganous-manganic oxide is widened.

This invention relates to compositions and methods for achieving the efficient aziridination of organic molecules, especially olefins. More specifically, the invention is directed to a mild, selective, and efficient aziridination protocol that involves catalysis by a mixed-valent dirhodium(II,III) catalyst (Rh₂⁵⁺). Especially preferred sources for forming such mixed-valent dirhodium(II,III) catalyst (Rh₂⁵⁺) are dirhodium(II) carboxamidates, such as dirhodium(II) caprolactamate, and their derivatives and analogues.

The present invention provides a flake compound which is useful for a conductive film. The flake compound comprises a conductive layer containing M and O, wherein M represents at least one metal element, preferably at least one transition metal element in mixed valent state.

The invention discloses preparation of a superfine mixed valence Ce-MOF nanowire and application in electrochemical luminescence sensing. The preparation of the superfine mixed valence Ce-MOF nanowire comprises the following steps of: mixing cation CTAB and an SDS surfactant to form a cation and anion micelle system, and generating a stable monocrystal superfine Ce-MOF nanowire colloidal solution in water. The size of the prepared Ce-MOF mixed valence state nanowire is about 50 nm, the nanowire has good water stability and conductivity, on the basis, the nanowire is introduced into a luminol hydrogen peroxide luminescence system, a novel two-channel self-circulation ECL catalytic amplification mechanism is provided, and finally, a molecular imprinting technology is combined, so that an ECL sensor based on the superfine mixed valence Ce-MOF is developed, the ECL sensor is used for detecting trace imidacloprid in plant-derived food, the linear range of the sensor is 2-120 nM, and the detection limit is 0.34 nM.

The invention provides a method for preparing mixed-valence (Cr(IV) and Cr(VI)) chromate Ca5Cr3O12, which comprises the following steps: uniformly mixing CaCrO4 and CaO, and carrying out high-temperature calcination in a mixed atmosphere (oxygen partial pressure is 10kPa-15kPa) of oxygen and nitrogen to reduce part of Cr(VI) in the mixture into Cr(IV) so as to generate Ca5Cr3O12; and using deionized water and organic acid (such as dilute acetic acid or formic acid) for washing an obtained product, and then heating and drying filter residues to remove moisture and other impurities. The Ca5Cr3O12 is prepared by adopting a reduction method, the process is simple, required raw materials can be purchased or prepared in a laboratory, the cost is relatively low, the purity of the prepared Ca5Cr3O12 can reach 80-97%, and the yield reaches about 90%.

The invention discloses a MnO2/MnO/Co3O4/C composite material and a preparation method thereof. The MnO2/MnO/Co3O4/C composite material has a core-shell structure, wherein the core is a manganese dioxide material, the shell is a MnO/Co3O4/C material; the manganese element in the composite material has a mixed valence state, the conductivity of the manganese element is higher than that of a transition metal oxide with only one valence state to a certain extent, the performance is improved, and the manganese element and the transition metal oxide have a synergistic effect. The MnO2/MnO/Co3O4/C composite material is prepared by a one-step method, and the operation is simple and convenient; meanwhile, the negative influence of high temperature on the morphology and the performance of the composite material is avoided; the carbon source can increase the overall conductivity and stability of the composite material and ensure that only part of manganese dioxide is reduced in the reaction; thecobalt salt is also added into the composite material, so that the electrical advantages of the cobalt salt can be exerted to improve the comprehensive performance of the whole composite material.

The invention relates to a preparation method of a poly(3,4-ethylenedioxythiophene)/self-doped defect-rich tin oxide nano composite photocatalytic material. A self-doped defect-rich tin oxide heterojunction material is loaded and dispersed on PETOT in a chemical bond complexing form to obtain the nano composite material; and the self-doped defect-rich tin oxide is selected from defect-rich tin oxide SnO2-x consisting of Sn-doped nonstoichiometric or mixed valent tin oxides. The electron-hole separation can be facilitated by utilizing the visible light responsive oxidation and reduction capacity of the self-doped defect-rich tin oxide heterojunction material, conductivity and hole transport capacity of PETOT as well as the chemical bonding heterojunction structure among different components, so that the excellent photocatalytic performance can be achieved. Meanwhile, the easy-to-mold characteristic of polypyrrole can effectively avoid the recycling difficulty of the powder material, sothat the poly(3,4-ethylenedioxythiophene)/self-doped defect-rich tin oxide heterojunction nano composite material is a novel environment-friendly photocatalytic material convenient to recycle.

The invention belongs to the technical field of preparation of inorganic materials, and particularly relates to a preparation method of cerium oxide with a specific mixed valence state. The method comprises the following steps: (1) under the condition of continuous stirring, sequentially adding a complexing agent and a template agent into a trivalent cerium salt aqueous solution to obtain a mixedsolution; then adding a pH value regulator into the mixed solution until the pH value of the mixed solution is 2-6; (2) continuously stirring for 10-60 minutes, carrying out solid-liquid separation, and drying to obtain a precursor of cerium oxide powder; and (3) carrying out spray roasting on the precursor of the cerium oxide powder at 200-500 DEG C, and cooling the roasted product by adopting inert gas to obtain the cerium oxide powder of which the mass content of trivalent cerium is 60% and the mass content of tetravalent cerium is 40%. According to the method, cerium oxide with the specific mixed valence state can be prepared and has a relatively good ultraviolet shielding effect.

The invention discloses a preparation method of an LSPR effect-based metal modified self-doped defect-enriched tin oxide nano composite material. The nano composite material modifies nano metal particles with a plasma resonant effect to a self-doped defect-enriched tin oxide nano composite catalyst material through chemical bond complexing; the self-doped defect-enriched tin oxide is selected fromSn-doped non-stoichiometric or mixed valent oxygen-enriched defective tin oxide (SnO2-x). The nano metal with the plasma resonant effect is selected from metal nanoparticles of a single component metal or a multi-component alloy such as Pt, Au, Ag, Cu and the like which have the plasma resonant effect. The photo-induced electron-hole separating rate in a photocatalytic reaction is fully improvedby means of the visible light photocatalytic oxidizing and reducing characteristic of the self-doped defect-enriched tin oxide, the plasma resonant effect of the metal nanoparticles and a heterogeneous structure with chemical bonding between the two components, so that the performance of degrading pollutants by photocatalytic oxidization and reduction and decomposing water to generate hydrogen bymeans of light catalysis is improved favorably.

The invention discloses a mixed-valence iron-based fluoride positive electrode material and a preparation method thereof. The method comprises the steps that 1, newly-prepared FeF3.3H2O is weighed, heated to 180-220 DEG C under the argon protection condition and then subjected to heat preservation for 2 h; raising the temperature to 400-420 DEG C again, keeping the temperature for 2 hours, and naturally cooling to room temperature to obtain a precursor; 2, mixing the precursor with oxalic acid, and carrying out high-speed ball milling and drying treatment; and 3, putting the mixture of the precursor and oxalic acid into a high-temperature reactor, introducing hydrogen-argon mixed gas, heating to 420 DEG C, keeping the temperature for 10-30 minutes, stopping introducing the hydrogen-argon mixed gas, introducing argon again, and quickly cooling to room temperature to obtain the mixed-valence iron-based fluoride positive electrode material of which the structural general formula is FexF3,wherein x is more than 1 and less than or equal to 1.2. The preparation method of the positive electrode material is good in flexibility, the content of ferrous iron in the positive electrode material can be controlled by adjusting the addition amount of oxalic acid and the reaction time, the technological method is simple, the operation labor intensity is low, and the requirement of large-scaleindustrial production is met.

The invention relates to a preparation method of a polypyrrole/self-doped defect-rich tin oxide heterojunction nano composite photocatalytic material. The nano composite material is obtained by loading and dispersing a self-doped defect-rich tin oxide heterojunction material on Ppy in a chemical bond complexing form; and the self-doped defect-rich tin oxide is selected from defect-rich tin oxide SnO2-x consisting of Sn-doped nonstoichiometric or mixed valent tin oxides. The electron-hole separation is facilitated by utilizing the visible light responsive oxidation and reduction capacity of theself-doped defect-rich tin oxide heterojunction material, the conductivity and photo conduction characteristic of polypyrrole as well as chemical bond heterojunction structure among different components, so that the excellent photocatalytic performance can be obtained. Meanwhile, the easy-to-mold characteristic of polypyrrole can effectively avoid the recycling difficulty of the powder material,so that the polypyrrole/self-doped defect-rich tin oxide nano composite material prepared by the method is a novel environment-friendly photocatalytic material convenient to recycle.

The invention belongs to the field of lithium ion battery energy storage, and discloses a preparation method and application of a mixed valence manganese-based oxide composite material. The method comprises the following steps: dissolving manganese salt and carbonate and/or bicarbonate in an alcohol organic solvent, and carrying out solvent heat treatment at 150-200 DEG C to obtain a manganese carbonate precursor; performing dopamine hydrochloride interface modification and calcination treatment to obtain a MnO@NC composite intermediate; and finally, the intermediate is subjected to oxidation treatment, 87.9% of MnO is oxidized into Mn3O4, and the secondary porous mixed-valence manganese-based oxide (MnO/Mn3O4@NC) nano composite material which is coated with a carbon layer and composed of primary nano particles and has a 3D structure is obtained. The preparation method is simple and low in cost; and the prepared MnO/Mn3O4@NC composite material is stable in structure, and has excellent lithium storage capacity, reaction reversibility and rate capability as a lithium ion battery negative electrode material.