97results about How to "Pure" patented technology

The invention discloses a method for compounding YAG single crystal nanometer powder, wherein routine inorganic salt is used as raw material to obtain a solid precursor material by a coprecipitation; supercritical water and sub-critical water are used as reaction media; the YAG single crystal nanometer powder material is compounded under the pressure of 8-30MPa and the temperature of 300 - 420 DEG C. The YAG nanometer powder material compounded by the method of the invention has the advantages that the phase is pure; the feature of the grain is a regular approximate spherical polyhedron; the distribution of the grain size is appropriate; foundation is established for preparing YAG transparent pottery laser material or device and promoting the study and development of novel laser material.

The invention relates to a solvothermal method for preparing a three-dimensional nanometer layered structure WS2 and an electrochemical application thereof. The method comprises the following steps: adding tungstic acid and S powder into a mixed solution of octylamine and n-hexyl alcohol, and rapidly stirring at room temperature, so that the components are fully mixed; transferring the fully stirred mixed solution into a hydro-thermal synthesis reactor, reacting under the constant temperature of 180-240 DEG C for 24 hours, filtering and collecting the reaction solution after the reaction solution is cooled to room temperature, cleaning by using ethanol and deionized water, drying, and performing heat treatment on the obtained solid products in a nitrogen atmosphere under the condition of 400-750 DEG C for 2 hours, thereby obtaining the three-dimensional nanometer layered structure WS2. The three-dimensional nanometer layered structure WS2 is applied to lithium ion battery and electro-catalysis hydrogen evolution reaction, good electrochemical performance can be obtained under the condition that mixing and coating are absent, and when the current density is 20mA/g, the discharge capacity of the lithium battery is 468mAh/g; and moreover, a hydrogen evolution initial potential more correct than WS2 in the prior art is obtained under the scanning speed of 10mV/s.

The invention relates to a calcium silicophosphate biomaterial, and a preparation method and a use thereof. Pure-phase calcium silicophosphate (Ca5(PO4)2SiO4) powder is synthesized through adopting a sol-gel method and treating a soluble silicon source, a soluble phosphorus source and a soluble calcium source as raw materials and water as a solvent, and the calcium silicophosphate powder is subjected to compression molding and is sintered to obtain a calcium silicophosphate (Ca5(PO4)2SiO4) ceramic block. The surface of the ceramic is deposited with a bone-like apatite layer after the calcium silicophosphate (Ca5(PO4)2SiO4) ceramic block is immersed in a stimulation body fluid for 1 day, and the thickness of the apatite layer increases with the prolongation of the immersion time. The calcium silicophosphate (Ca5(PO4)2SiO4) material prepared in the invention has good biological performances, is a most potential biological and medical material, and can be used as a material for bone tissue restoration and filling, and dental restoration.

The present invention relates to one kind of red long afterglow phosphor material and its preparation process. The matrix of the phosphor powder is aluminate in the chemical expression of SraAlbO6:cEu2+, dDy3+, where, a=3-c-d, b is 1.9-2.1, c is 0.1-0.2, and d is 0.05-0.1. It is prepared through a nanometer pseudoboehmite sol-gel and microwave ignition process including hot air spray pelletizing of composite RE sol, ignition of dry gel in reducing atmosphere inside a microwave oven and cooling to room temperature to obtain the red long afterglow phosphor material. The red long afterglow phosphor material has the advantages of pure physical phase, homogeneous granularity distribution, loose powder, low material cost, simple preparation process and easy industrial production.

The invention discloses a fireproof composition product of cement rotary kiln transmitting belt through dried method, which comprises the following parts: 50-79% alumina clinker aggregate with Al2O3 not less than 90% and bulk density not less than 3.0g/cm3, 5-20% silicon carbide, 3-15% clay with Al2O3 not less than 32%, 3-15% alumina, wherein the silicon carbide, clay and alumina are added at 0.1-10mm fined powder pattern, which possesses 63-75% Al2O3,8-32.5% SiO2 and 4.5-19% SiC for sintered components.

The invention discloses a synthetic method of pore size-adjustable nanometer mesoporous CuAl2O4 spinel. The synthetic method is characterized by comprising the following steps of: reacting for 24 hours at the constant temperature of 80 DEG C by using Cu(NO3)2.3H2O and Al(NO3)3.9H2O as raw materials, using n-butylamine and dodecanol as co-template, and using water and alcohol as solvent; washing the product by water and alcohol, centrifugally separating and drying the washed product to obtain a copper-aluminum hydroxide coprecipitation precursor; roasting the precursor for 2 hours in a muffle furnace of 800 DEG C to obtain mesoporous CuAl2O4 spinel. The synthetic method of pore size-adjustable nanometer mesoporous CuAl2O4 spinel disclosed by the invention is reasonable in design, simple in process, smaller in product particle dimension, large in specific surface area, concentrated in pore size distribution and adjustable within a range of 5nm-17nm.

The invention relates to a preparation method of a chemical solution of terbium-doped tungsten molybdate green fluorescent microcrystalline. The green microcrystalline provided by the invention can be expressed by a general formula A0.925(WO4)0.5(MoO4)0.5:Tb3+0.05, wherein A=Ca, Sr and Ba. The preparation method comprises the following steps of: preparing the molar ratio of various raw materials required by a certain amount of target system, A0.925(WO4)0.5(MoO4)0.5:Tb3+0.05 microcrystalline, weighing a certain consistency and relative volume of A(NO3)2, TbCl3 solutions in a polytertrafluoroethylene beaker, respectively adding the relative amounts of Na2MoO4 and Na2WO4 solutions, stirring at the room temperature for 15-30min, and putting the polytertrafluoroethylene beaker into a high-pressure reaction kettle; naturally cooling down to the room temperature after carrying out a hydrothermal reaction under 80-180 DEG C for 15-30h; and centrifugalizing and cleaning in deionized water sediments, and baking the sediments under 100-150 DEG C to obtain the A0.925(WO4)0.5(MoO4)0.5:Tb3+0.05 solid solution luminescent microcrystalline. The invention has the advantages of environment protection, energy conservation, simple preparation processes and devices and low reaction temperature. The terbium-doped tungsten molybdate green fluorescent microcrystalline prepared by the preparation method disclosed by the invention has the advantages of pure phase, uniform granularity, suitable grain size, regular appearance, highly pure and bright green and excellent practicability.

The invention discloses a method for synthesizing lithium vanadate Li3VO4 monocrystal micrometer powder with a high-temperature and high-pressure mixed solvent thermal system.The method comprises the steps that solid lithium carbonate powder and solid vanadium pentoxide serve as raw materials, a high-temperature and high-pressure mixed solvent serves as a reaction medium, and the lithium vanadate Li3VO4 monocrystal micrometer powder is synthesized with the condition ranges of 2-9 MPa, 200-350 DEG C and 1-4 h.The method has a unique advantage, the lithium vanadate Li3VO4 monocrystal micrometer powder can be quickly, easily and conveniently obtained, the physical phase is pure, the particle size ranges from 1 micrometer to 20 micrometers, and the dispersibility is good.The synthesizing method is easy, convenient and safe to implement, equipment is convenient to use and simple, the reaction process is easy to control, energy conservation and environment protection are achieved, and the method is especially suitable for industrialized mass production.

The invention discloses a microwave-assisted solvothermal synthesis method of I-III-VI semiconductor material nano-powder. The method comprises the following steps: adding metal salt and a sulfur source or selenium source into a beaker based on the mole ratio of an expected product, adding a solvent, evenly mixing and then transferring the obtained mixed solution to a microwave reaction kettle; after the reaction kettle is closed, heating the mixed solution to rated temperature in a microwave field, and performing heat preservation for rated time; and centrifugally washing the final product to obtain the target powder. In the method, the solvent is one or more of water, ethylenediamine, ethylene glycol, diamine and ethanol; the metal salt is the metal salt of Cu, In, Ga and Al; the sulfur source is thiourea or sulfur powder; and the selenium source is selenium powder or seleninic acid. The microwave-assisted solvothermal synthesis method has the beneficial effects that based on the heating and activation effect of the microwave field, reaction temperature is lowered and reaction time is shortened; and part of reaction that can not be made in the traditional high-pressure solvothermal synthesis process can be performed smoothly. The obtained semiconductor material nano-powder has the advantages of smaller grain size, pure phases, accurately controlled stoichiometric ratio of the phases and the like.

The invention discloses a bimetallic nitride Co3W3N, a preparation method and application thereof. The Co3W3N is prepared by subjecting a cobalt salt and a tungsten salt of equal molar ratio to hydrothermal reaction and then performing nitriding synthesis. The Co3W3N is applied to the electrochemical catalysis field. The bimetallic nitride Co3W3N provided by the invention is a intermetallic mold filling compound, has the properties of covalent compounds, ionic crystals and transition metals, has high oxygen reduction catalytic activity and nitrogen reduction catalytic activity, the catalytic activity is close to that of commercial Pt/C, also the phase is pure, the stability is strong and the methanol resistance is excellent. At the same time, the preparation method is simple, effective andcontrollable, is easy to operate, low in cost and high in yield, and the problems of poor cycle stability and easy agglomeration of particles caused by thermal decomposition of the bimetallic nitrideto form a mixture of metal elements and metal nitrides can be effectively avoided.

The invention discloses a method for synthesizing a tellurium molybdate magnesium single crystal micro powder by using a supercritical water system. With solid magnesium oxide powder, a tellurium dioxide powder and a molybdenum trioxide powder as raw materials and high temperature and high pressure water as a reaction medium, the tellurium molybdate magnesium single crystal micro powder material is synthesized in a sealed pressure container within a condition range of 380 DEG C and 23-25 MPa. The tellurium molybdate magnesium single crystal micro powder material synthesized by the method disclosed by the invention has the advantages of pure phase, comparatively structured particle morphology, particle size range of 15-50 microns, uneasily agglomerated particles and better dispersity. The synthesizing method disclosed by the invention is also suitable for synthesizing a plurality of multibasic oxide single crystal micro materials containing the molybdenum and tellurium and provides a simple, convenient, rapid, safe and environment-friendly preparation process route for novel multibasic oxides containing the molybdenum and tellurium.

The invention relates to research of a novel composite tungsten molybdenate phosphor, and especially relates to a novel fluorescent microcrystal prepared by a chemical solution method. The microcrystal provided by the invention can be expressed by a general formula of Na4-3xEux(WO4)2-y(MoO4)y, wherein 0<x<4/3 and 0<y<2. The preparation method comprises the following steps: according to a molar ratio of raw materials required for the preparation of a certain amount of Na4-3xEux(WO4)2-y(MoO4)y, measuring corresponding volumes of Na2MoO4 and Na2WO4 solutions in a polytetrafluoroethylene beaker, respectively adding a corresponding amount of EuCl3 solution, stirring at normal temperature for 15-30 min, adjusting the pH to 6-9, and finally putting the polytetrafluoroethylene beaker into a high pressure reaction vessel; performing a hydrothermal reaction at 80-160 DEG C for 15-30 hours, naturally cooling to room temperature; centrifuging the precipitates for separation, washing with deionized water, and drying at 100-150 DEG C to obtain the Na4-3xEux(WO4)2-y(MoO4)y microcrystal. The preparation method of the invention is simple in preparation process, low in reaction temperature. The prepared tungsten molybdenate fluorescent microcrystal is pure in phase, uniform in granularity, appropriate in particle size, and regular in morphology, can exhibit red light with high purity and brightness, and has good practicality.

The invention discloses a method for preparing a tungsten trioxide/tungstic acid composite photocatalytic material through in-situ self growth. The method comprises the following steps: by taking water-soluble tungstate and zinc salt as raw materials, preparing nano tungstic acid powder by using a hydrothermal method, carrying out in-situ medium reduction on the tungstic acid powder in the presence of H2 so as to prepare W/WO3/ZnWO4 composite powder, and finally carrying out a thermal treatment process to oxidize W into WO3, thereby obtaining in-situ self growth W/WO3/ZnWO4 composite powder. The method is simple to operate, in-situ self growth of WO3 is carried out on the surface of ZnWO4, the phenomenon that in the prior art components are not uniformly distributed when the W/WO3/ZnWO4 composite powder is prepared can be effectively solved, and the stability of properties of the composite powder can be ensured.

The invention relates to a preparation method of a positive pole material Na1.1V3O7.9 of a lithium ion battery. The preparation method can prepare the positive electrode material Na1.1V3O7.9 with goodelectrochemical performances through a sol-gel method through heat treatment at different temperatures.

The invention discloses a preparation method for ZnNb2O6 microwave dielectric ceramic powder. The preparation method comprises the steps of precursor preparation, a precipitation reaction, a hydrothermal reaction and pumping-filtration drying. Through the preparation method for the ZnNb2O6 microwave dielectric ceramic powder, the resultant temperature of the ZnNb2O6 microwave dielectric ceramic powder can be lowered, ultramicro ZnNb2O6 ceramic powder with excellent microcosmic properties can be obtained, and then the dielectric properties of microwave dielectric ceramic can be improved.

Provided are a carbon nanotube composite barium titanate wave absorbing nano-material and a preparation method therefor. The wave absorbing nano-material is composed of carbon nanotube powder and barium titanate according to a weight ratio of 0.026-0.111 through combination. Carbon nanotube powder is dispersed in a mixed solution of concentrated sulfuric acid and nitric acid with a volume ratio of 3:1 and pretreatment is carried out; tetrabutyl titanate is dissolved in absolute ethyl alcohol, and a solution A with a concentration of 0.5-1mol/L; barium acetate is dissolved in deionized water, polyvinylpyrrolidone is added as a dispersant, and a solution B with a concentration of 1-1.5mol/L; glacial acetic acid and the solution B are added in the solution A in order and transparent sol is prepared; carbon nanotube powder after pretreatment is weighed and dispersed in the transparent sol, and the mass ratio of the carbon nanotube powder to barium titanate is 0.026-0.111; the mixture is placed in a water bath kettle, heat insulation is carried out for 24h, and the mixture is ground into powder; the above powder is placed in a tubular furnace with nitrogen as a protection atmosphere, calcination is carried out for 2h, and the finished product is obtained. The prepared carbon nanotube composite barium titanate wave absorbing nano-material is advantaged by light weight, wide wave absorbing frequency band and strong wave performances.

A process for preparing the cylindrical monocrystal particles of sodium barium niobate by salt smelting method features that the raw materials (BaCO3 and Nb2O3) and the medium (NaCl) are used to synthesize said cylindrical monocrystal particles in the high-temp fused Na salt. Its advantages are high efficiency and high purity and reaction activity of said particles used to prepare the ceramics with texture structure.