154results about How to "High degree of crystallization" patented technology

A process for preparing the cubic silver nanocrystals includes such steps as proportionally dissolving surfactant and silver nitrate in organic solvent while stirring, slowly adding to an organic solvent at 150-180 deg.C to obtain the saturated solution of Ag nanoparticles, continuous reacting, and slow cooling while stirring to obtain the sol of cubic silver nanocrystals. Its advantage is high purity and dispersity.

The invention relates to a luminous metal-organic framework material with a chemical sensing function, a preparation method of the luminous metal-organic framework material, and an application of the material in detection of nitrobenzene organic matters. The preparation method comprises the following steps of: dissolving 5-(4-pyridyl)-1, 3-phthalic acid and zinc salt into an organic solvent in a certain proportion; and then synthesizing in a solvothermal way so as to obtain the luminous metal-organic framework material. The preparation method is simple in preparation process, high in material purity and excellent in stability. The synthesized metal organic framework material has the maximum emission wavelength of 381nm in water, and the fluorescence intensity of the synthesized metal organic framework material is gradually reduced as the unceasing increase of the concentration of the nitrobenzene organic matters, therefore, the material can be well applied to the detection of the nitrobenzene organic matters, and has the advantages of being fast in speed, simple, convenient, great in selectivity, high in sensitivity, etc.

The invention discloses a magnetic carbon-based iron oxide compound material and a preparation method of the magnetic carbon-based iron oxide compound material. Particularly, the invention discloses a prepraation method of the magnetic carbon-based iron oxide compound material. The preparation method comprises the following steps of: (a) providing a mixture comprising a carbon-based precursor, elemental iron and a solvent; and (b) carrying out heating reaction on the mixture in the step (a), thus obtaining the carbon-based iron oxide compound material. The method has the advantages that materials are common and are easily available, and the process is simple, safe and effective and the like. The obtained compound material has stable magnetism, and is wide in application.

The invention discloses a preparation method of a nitrogen oxide sensor component based on WO3 single-crystal particles, which comprises: (1) preparing tungsten hexachloride solution; (2) adjusting the molar concentration of tungsten hexachloride to be 0.003-0.014M; (3) synthesizing quasi-oriented tungsten oxide nanowires; (4) preparing nanowire-based sensitive slurry; and (5) preparing the nitrogen oxide sensor component based on the WO3 single-crystal particles. The prepared WO3 single crystal has a pure single inclined-phase structure, and the single-crystal particles have a complete structure, a high degree of crystallization, a clear crystal face and regular morphology. By adopting the gas sensor based on the single-crystal tungsten trioxide material, high-sensitivity and high-selectivity rapid response can be realized for NO2 at the level of ppm to ppb.

The invention discloses a preparation method for a micro-order platy silver powder, which comprises the following steps: preparing 10-180g/L AgNo3 aqueous solution, and regulating the pH value to be 2.0-5.0; (2) preparing 12/204g/L ascorbic acid aqueous solution; (3) preparing dilute sulphuric acid or soluble sulfate solution, wherein the mass of sulfate ions is 0.3-1.5 times that of AgNO3; (4) at 10-60 DEG C under stirring state, mixing the dilute sulphuric acid or soluble sulfate solution and the reducing agent ascorbic acid aqueous solution with certain volume into certain volume of silver nitrate solution for reaction for 3-6 minutes, standing for 5-300 minutes and carrying out liquid-solid separation; and (5) rinsing the solid product obtained from the step (4) with deionized water and absolute ethyl alcohol respectively until the pH of the cleaning solution is neutral, and drying at 30-65 DEG C for 1.5-5 hours, thus obtaining the micro-order platy silver powder product. By adopting the preparation method, the micro-order platy silver powder which has a width-to-thickness ratio larger than or equal to 10 and plate diameter of 5-50mum; and the preparation method omits the grinding procedure of the traditional machine, is simple in technique, easy to operate, and low in cost and has no pollution to the environment.

A method for preparing positive electrode multielement active material containing lithium / manganese composite oxide includes directly using lithium hydroxide coprecipitation to prepare M ( OH )2 , mixing it with lithium salt in grinding , forming plate by pressing , prebaking , cooled ball grinding , forming plate by pressing and backing . In the method , applied nickel salt is nickel acetate or nickel nitrate , applied cobalt salt is cobalt acetate or cobalt nitrate, applied manganese salt is manganese nitrate or manganese acetate and applied lithium salt is lithium carbonate or lithium acetate .

The invention discloses an ionic liquid sensibilized perovskite solar cell and a preparation method thereof. The ionic liquid sensibilized perovskite solar cell comprises an ITO substrate layer, a TiO2 compact layer on the ITO substrate layer, a mesoporous aluminum oxide layer on the TiO2 compact layer, an ionic liquid-perovskite composite layer on the aluminum oxide layer, and a carbon back electrode layer on the ionic liquid-perovskite composite layer. An ionic liquid is adopted for soaking a perovskite thin film, so that the crystallization degree of perovskite is improved, and the morphology defect of the perovskite is reduced, and therefore the separation and transmission conditions of electron holes at the heterojunction interface are improved, and the photoelectric conversion efficiency of a battery device is improved; a carbon back electrode is prepared through a spraying method; by virtue of the synergistic effect of the relatively small contact interface between the carbon black and the perovskite and the high conductive performance of carbon nano tubes, the filling factor and the photoelectric conversion efficiency of the battery are further improved; and the preparationprocess is simpler, thereby providing a novel method for commercial production of the large-area perovskite solar cell.

The invention discloses a preparation method of carbon-coated cobalt metal nano-particles, which relates to a gaseous compound decomposition-based chemical plating by which reaction product of surface material is not preserved in a plating layer and only carbon is deposited, and is a method for decomposing ethyne and synthesizing carbon-coated cobalt metal nano-particles on potassium chloride carrier by means of chemical vapor deposition. The preparation method comprises the following steps: firstly, preparing cobalt-potassium chloride catalyst, then, synthesizing carbon-coated cobalt metal nano-particles, and finally, performing purification to obtain the carbon-coated cobalt metal nano-particles with purity of 95-99%. The preparation method overcomes the defects that the carbon-coated metal nano-particles synthesized by the existing technology have low purity, poor performance and low yield, and contains overmuch impurities, and the impurities are not easy to remove.

The invention relates to a preparation method of a boron nitride nano tube. The method comprises the steps of carrying out ball milling on metal magnesium powder and low-cost boron oxide as a boron source instead of B to prepare a precursor; preparing the pure-phase boron nitride nano tube with a high length-diameter ratio in high-temperature ammonia gas atmosphere in a vertical induction heating furnace. According to the invention, used raw materials are boron oxide powder and metal magnesium powder which both belong to ordinary chemical raw materials which are industrially produced, are low and easily available and non-toxic; the synthesized boron nitride nano tube is high in purity, large in length-diameter ratio, little in defect and uniform in morphology; the method is non-toxic, reliable and suitable for synthesis on large scale; the prepared boron nitride nano tube can be applied to the fields of nanoelectronics, electronic heat dissipation elements, solid/liquid lubricants, nano composite materials, high-temperature structure members and the like.

The invention relates to a rapid preparation method of a high-dispersible TiO2 nano crystal sol, belonging to the technical field of semi-conductor nano crystal preparation. The preparation method is as follows: dissolving inorganic titanium salt serving as a titanium source in a corresponding solvent so that a solution with a certain concentration is prepared; adding alkali liquor to regulate the pH value to 7.5-8.5 and generate a precipitate; washing the precipitate, carrying out complexing reflux dispergation by utilizing H2O2 so as to obtain a peroxotitauium acid sol; and transferring the peroxotitauium acid sol into a hermetic high-temperature kettle of a microwave sampling system, and crystallizing for a while at a certain power and temperature, so that finally, the TiO2 nano crystal sol is prepared. The advantages of solvent heat and microwave methods are integrated in the method provided by the invention, the zeta potential of the obtained sol is between 50 and 70 mV, and the obtained sol has higher dispersibility; and in the preparation process, no surfactant is introduced, high-temperature calcination is not needed, and the obtained sol has a wide application prospect in the field of photocatalysis.

The invention provides titanium dioxide composite filler, a preparation method thereof and a reflective heat insulation coating, and belongs to the technical field of coatings. According to the invention, activation and modification are carried out on hollow glass microspheres, so that activity of surfaces of the hollow glass microspheres is effectively improved, compact deposition of titanium dioxide crystals on the surfaces of the microspheres is ensured, and the titanium dioxide film coating rate and coating uniformity on the surfaces of the glass microspheres are improved. The concentration of a titanium tetrachloride ethanol solution is controlled, and the addition speed and stirring speed of the titanium tetrachloride ethanol solution are controlled, so that titanium dioxide crystalswith different particle diameters are formed, and emissivity of the coated microspheres to sunlight is greatly improved. Reflective heat insulation performance of the reflective heat insulation coating prepared by the titanium dioxide composite filler is remarkably improved, hemispherical emissivity, sunlight reflection ratio and near-infrared emissivity all exceed 90%, and excellent comprehensive performance such as adhesive force, flexibility, acid resistance, alkali resistance and the like are achieved.

The present invention belongs to the field of chemical preparation technology of RE powder material. The form of the precursor has certain genetic inheritance to the form of final particle after calcinations. Unlike available one-step CeO2 synthesizing process forming single spherical particles, the multiple-step process of the present invention results in CeO2 precursor particles of different forms. The multiple-step process includes the steps of: dissolving trivalent Ce salt in distilled water to compound solution, adding urea to the Ce salt solution to form clear mother liquid of certain Ce ion/urea molar ratio, adding surfactant, continuously stirring in water bath of 70-95 deg.c for full reaction to obtain precipitate, and separating, collecting, washing and drying the precipitate to obtain Ce2O(CO3)2.H2O powder of different forms. The Ce2O(CO3)2.H2O powder has monocrystal structure of orthorhombic system in micron level, different forms and high crystallization degree.

The invention provides a method for preparing a positive electrode material for a lithium ion cell by spraying, combustion and pyrolyzing. The method comprises the following steps of S1, proportionally adding a lithium source and a metal compound into a solvent and mixing them well, thus forming a mixed slurry precursor; and S2, spraying the mixed slurry precursor into a pyrolyzing furnace in a manner of spray, thus pyrolyzing or combusting the lithium source and the metal compound to form the required positive electrode material for the lithium ion cell, wherein the temperate of the pyrolyzing furnace is controlled to be 650-850 DEG C.

The invention discloses a preparation method of low-cost large-batch graphene, relates to a preparation method of a nano carbon structural material, and aims at solving the problems of complicated procedures, strict demands on production equipment, high technological difficulty and high cost of high-quality graphene preparation. The method comprises the steps that carbon dioxide is introduced to semi-solidified or liquefied magnesium alloy, and the reaction of Mg+CO2=MgO+C between the carbon dioxide and the magnesium takes place. A carbon product generated in the reaction is the graphene. Finally the contained graphene and alloy are dissolved by using dilute sulphuric acid, suction filtration is conducted for multiple times to remove impurities, and the graphene is obtained after drying isconducted. According to the method, the graphene is prepared through a magnesium thermal reduction method, the problems of difficult graphene preparation and high cost are solved, and the low-cost high-batch graphene can be produced in a large scale. The method is applied to the field of nano material synthesis.

The invention belongs to the technical field of inorganic nano-materials, and relates to a synthetic method of tungsten oxide nano-wires for preparing gas sensitive sensors. The synthetic method includes the steps: (1) placing tungsten hexachloride into absolute ethyl alcohol; (2) uniformly stirring the tungsten hexachloride, transferring formed light-green tungsten hexachloride alcoholic solution into a stainless steel hydrothermal reaction kettle, performing reaction of predetermined time at the predetermined temperature, and enabling the tungsten hexachloride to convert into tungsten oxide; (3) centrifuging solution of the tungsten oxide obtained by reaction, and ultrasonically cleaning reactants by the aid of ethyl alcohol and water; (4) drying obtained tungsten oxide nano-wires in a vacuum drying oven for 1-2 hours at the temperature ranging from 40 DEG C to 60 DEG C to obtain the tungsten oxide nano-wires. The synthetic method has the advantages that other organic solvents and surface active agents are omitted, so that materials have good purity, subsequent purification is omitted, the tungsten oxide nano-wires have reducibility and the advantages of high safety, high in operability and easiness in popularization, and the obtained materials have high crystallizing degree.

A multiplayer perform having at least a medium or intermediate gas barrier layer is prepared in advance by the injection molding of this perform in a predetermined shape that corresponds to the shape of a finished molded product. The body portion of this perform is heated to a blow moldable temperature. The heated perform is set in a primary blow mold (12), and is blow molded in the biaxial orientation to give a primary molded intermediate (5). The primary intermediate (5) is then heated to deform it forcibly by thermal shrinkage and thereby to give the secondary molded intermediate (6). The shrunken secondary intermediate (6) is set in a secondary blow mold (13), and is subjected to the secondary blow molding in the biaxial orientation to obtain a finished molded product, which is fixed thermally to give heat history to the PET resin. As a result, the PET resin layers are given a high degree of crystallization, which serves to complement the function of the gas barrier layer or layers in such a way that the container has high and effective gas barrier properties.

The invention discloses a method for preparing a reinforced titanium-based composite material of a carbon nanometer tube through vacuum hot pressing, and belongs to the preparation technology of composite materials. The method comprises the following processes: a titanium powder precursor loaded with cobalt hydroxide is prepared by adopting a deposition precipitation method; the carbon nanometer tube is grown on titanium powder loaded with a catalyst by adopting a chemical vapor deposition method to obtain the carbon nanometer tube/titanium composite powder; the carbon nanometer tube/titanium composite powder and pure titanium powder are mixed through ball milling to obtain the reinforced titanium-based composite material of the carbon nanometer tube through a vacuum hot pressing technology. According to the invention, the preparation process is easy to operate, the technology is simple and stable, the vacuum hot pressing forming process is adopted, the composite material can still achieve higher compactness under lower sintering temperature due to the effect of pressure, and the excessive reaction between the carbon nanometer tube and titanium is avoided.

The invention discloses an Ag-MoS2@TiO2 nano photocatalytic sterilization material and a preparation method thereof. Chitosan is applied to the reaction of nano titanium dioxide, molybdenum disulfideand silver ions, so that the prepared Ag-MoS2@TiO2 nano material keeps a good in-situ dispersion characteristic, the catalytic efficiency of titanium dioxide in natural light is improved, and an excellent sterilization effect is achieved. According to the method disclosed by the invention, a MoS2 lamella is opened by using high-frequency and high-energy ultrasonic treatment, and MoS2 can be crushed at 110-140 DEG C, so that MoS2 small molecules subjected to fault crushing can be doped into nano titanium dioxide crystals. The Ag-MoS2@TiO2 nano material prepared by the method disclosed by the invention is uniform in size, good in dispersity, good in photocatalysis effect and good in sterilization effect.

The invention relates to a method for preparing a doping type carbon dioxide adsorbent ceramic. The doping type carbon dioxide adsorbent ceramic prepared by adopting the method is smaller in particle size, larger in specific surface area, high in material activity and strong in carbon dioxide adsorbing capability, and industrial production can be achieved through large-scale preparation.

The invention relates to an iron-containing catalyst, in particular to a method for preparing carbon coated iron-cementite magnetic nanopaticles. According to the method, by means of a mixed solutionof ferric citrate and potassium bromide, ferric citrate particles which are evenly distributed on the surface of a potassium bromide carrier and serves as an iron metal source are obtained through thefreeze drying technology, and a ferric oxide-potassium bromide catalyst precursor is obtained through calcining; and then the carbon coated iron-cementite magnetic nanopaticle products with a carbonlayer as an outer layer and iron and cementite forming a core are prepared through a chemical vapor deposition method. The defects that in the prior art, the prepared carbon coated iron nanoparticlesare low in purity, poor in particle dispersity and particle size controllability, low in particle crystallization degree, poor in stability and not good in overall performance are overcome.

The invention discloses a method for promoting the surface crystallization of glass, which mainly comprises the following step of: introducing a crystallization accelerant into glass when the glass is made so as to promote the surface crystallization of the glass. The crystallization accelerant comprises one or a mixture of titanium oxide and chromium sesquioxide. The surface crystallization of the glass is promoted by the simple method. The surface crystallization speed of the glass or the content of a crystal phase in a surface crystallized layer can be raised by adding glass nucleating agents (TiO2 and Cr2O3) used in traditional overall crystallization without breaking the glass. The process is simple and feasible, and surface crystallization effect is remarkable. Besides, the crystallized glass with different crystallized layer thicknesses and different crystal contents can be obtained through the adjustment of the use quantities of the TiO2 and the Cr2O3, and various requirements are met.