768 results about "Thermal methods" patented technology

Various methods are provided for metathesizing a feedstock. In one aspect, a method includes providing a feedstock comprising a natural oil, heating the feedstock to a temperature greater than 100° C. in the absence of oxygen, holding the feedstock at the temperature for a time sufficient to diminish catalyst poisons in the feedstock, and, following the heating and holding, combining a metathesis catalyst with the feedstock under conditions sufficient to metathesize the feedstock.

The invention provides a method for preparing a titanium dioxide nano belt, belonging to the nano material technical field. The prior methods for preparing the titanium dioxide nano belt comprise the hydro-thermal method and the combination method of the sol-gel method and the hydro-thermal method. The prior electrostatic spinning method is applied to the preparation of nano fibers. The invention comprises three steps that: 1. a spinning solution is prepared; the mixture of polymethylmethacrylate and vinylpyrrolidone is used as a macromolecule template, and the mixture of chloroform and N,N-dimethylformamide is used as a solvent; 2. a titanium alkoxide / macromolecule template compound nano belt is prepared; the electrostatic spinning method is used, and the technical parameters are as follows: the voltage is between 15 and 25kV and the curing distance is between 15 and 30cm; 3. a TiO2 nano belt is prepared; the heat treatment method is used, and the technical parameters are as follows: the rate of temperature rise is between 0.5 and 2 DEG C / min and the heat preservation time at the temperature of between 500 and 900 DEG C is between 10 and 15h; for the TiO2 nano belt prepared, the width is between 5 and 15mu m, the thickness is between 30 and 60nm and the length is more than 200mu m; the TiO2 nano belt comprises a pure phase anatase type TiO2 nano belt and a pure phase rutile type TiO2 nano belt.

The invention has a grain structure with an outer shell and several inner cores. The grain size is from 100 nanometers to 100 microns. The inner cores are compound grain that includes active substance and conducting additive. The outer shell is a carbon layer. The active substance takes 20-95wt% of total cathode active material, and is mixture of one or several transition metallic compound selected from silicon and lithium storage whose thermodynamic equilibrium potential is less than 1.5v. The cathode material can be made by using mechanical process or thermal method, and can be directly used as cathode material or used with other existing cathode material.

Methods for forming a rib on a cannula for cooperation with a safety cover which securably and reliably locks the tip of a cannula in an interior chamber within the safety cover. The cover comprises an elongate body having the interior chamber and an axial through hole which extends along the entire length of the body, through the interior chamber and through which the cannula is slidably received. Displacing elements are positioned within the interior chamber, each of which includes a hole for receiving the cannula therethrough, and which displaces upon retraction of the tip of the cannula, thereby preventing subsequent advancement of the cannula tip. The cannula includes a thickened rib adjacent to the tip, and the safety cover should correspondingly include an annular section in the rear portion thereof. The through hole extending through the rear portion has a diameter which is smaller than the thickened rib of the cannula whereby the cannula tip may not be retracted from the safety cover. The rib is formed by a thermal method in which a sleeve is heated to expand its inside diameter to allow the sleeve to be slid onto the cannula. The sleeve is then cooled to room temperature so that the inside diameter contracts to attach the sleeve to the cannula. In another method, a sleeve is placed on the cannula and crimped at the desired location.

The invention relates to a layered lithium-rich anode material clad by metal fluoride, and a preparation method thereof. According to the invention, a layered lithium-rich material Li[Li(1-2x) / 3MxMn(2-x) / 3]O2 is prepared with a combined technology of a oxalate precipitation method and a hydro-thermal method, wherein M is Ni, Co, Cr or any two of them which coexist, and x=0 to 0.33. The lithium-rich material is impregnated in a solution of soluble salts of metals such as yttrium, magnesium and iron; a soluble fluoride solution is added to the mixture, wherein n(Me):n(F)=1:y; the solution is continuously stirred for 3-8h in a water bath with a temperature of 60-90 DEG C; the solution is subject to centrifugal washing, and is dried under a temperature of 60 DEG C in a vacuum thermostat; a material obtained after drying is roasted for 4-8h under a temperature of 400 DEG C and under the protection of argon gas, such that Li[Li(1-2x) / 3NixMn(2-x) / 3]O2 clad by a fluoride MeFy is prepared. The electrode material provided by the invention is advantaged in high electrochemical capacity, good cyclical stability, excellent rate performance, and the like. The preparation process is simple, the cost is low, and the reproducibility is good.

A non-contact acousto-thermal method and apparatus are provided for detection of incipient damage in materials. The apparatus utilizes an ultrasonic horn which receives an acoustic wave generated by an ultrasonic transducer energized by an RF pulse. The ultrasonic horn is placed at a distance from the sample to be tested with sufficient gap so that when excited, the face of the ultrasonic horn does not come into contact with the sample. An IR camera is placed at a distance from the opposite side of the sample. The acoustic wave is amplified by the ultrasonic horn, and the interaction between the sample and the acoustic wave produces changes in the temperature of the sample in the region of interaction during acoustic excitation such that the temperature of the material rapidly increases. The temperature-time profile is captured by the IR camera and may be analyzed by a data acquisition unit.

The invention relates to a preparation method of nitrogen-doped graphene. According to the invention, urea is adopted as a reducing agent, and is subjected to a hydro-thermal reaction with graphene, such that the nitrogen-doped graphene is obtained. According to the invention, the hydro-thermal method is adopted, a relatively high temperature is not required, requirements on equipment are low, and energy can be saved. During the preparation process, urea is adopted as the reducing agent. Urea is advantaged in non-toxicity and low environment pollution. The preparation method is advantaged in simple process, short reaction time, and relatively high efficiency. With the method, the prepared nitrogen-doped graphene is advantaged in good performance.

The invention relates to a method for preparing graphene / Fe3O4 composite powder by an alcohol thermal method, which comprises the following steps of: (1) weighing oxidated graphite and ferric salt at room temperature, dispersing into a glycol solution, adding polyethylene glycol after dissolving completely, then adding anhydrous sodium acetate, stirring and forming reaction liquid; (2) putting into a reaction kettle, heating to the temperature of 180 to 220 DEG C and reacting for 8 to 16h; and (3) cooling to the room temperature, collecting a product by using a magnet, washing the product by deionized water and drying so as to obtain the graphene / Fe3O4 composite powder. In the invention, the preparation method is simple and is easy for industrialized production; and Fe3O4 in the prepared graphene / Fe3O4 composite powder has pure crystalline phase, little possibility of agglomeration, favorable compounding with graphene and good dispersibility at the surface of the graphene and in the layer of the graphene, and the composite powder has small resistivity and high magnetization intensity.

The invention belongs to the field of nano material preparation, and particularly relates to water-soluble fluorescent magnetic nano particles and a preparation method thereof. The invention adopts the technical scheme that the method comprises the following steps of: preparing magnetic nano particles by adopting a solvent thermal method, coating a SiO2 shell layer on the surface of the magnetic nano particles by hydrolysis of ethyl orthosilicate under the alkali condition, and connecting -NH2 to the outermost layer through a silane coupling agent with amino; and finally, mixing two kinds of aqueous solution, adding a connecting agent such as ethylene dichloride (EDC) or the like, and connecting the magnetic nano particles and quantum dots through chemical bonds formed by condensation reaction between amino and carboxyl to obtain the fluorescent magnetic nano particles. The fluorescent magnetic nano particles obtained by the technical scheme have low toxicity, good stability and magnetic response and excellent fluorescence; and the method has short experimental period, simple and safe operation and low raw material cost, can be completed in a common chemical laboratory, and lays a foundation for wide popularization and application.

The invention relates to a preparation method of a monodisperse nanometer olivine type manganese-based phosphate positive-pole material and a lithium-ion secondary battery thereof. The preparation method of the monodisperse nanometer olivine type manganese-based phosphate positive-pole material comprises the following steps of: dispersing a lithium source compound, a manganese source compound, a phosphorus source compound and a doped element compound into a mixed solvent containing water and an organic solvent; controlling the volume ratio of the organic solvent to the water which are contained in the mixed solvent at (0-5):1; and carrying out mixed solvent thermal reaction in a reactor at the temperature of 120-230 DEG C under the reaction pressure of 0.2-30 MPa for 1 minute-24 hours so as to finally obtain the monodisperse nanometer olivine type manganese-based phosphate granule positive-pole material. The invention also discloses the relevant lithium-ion secondary battery. The monodisperse lithium iron phosphate nanometer material with rod-shaped and sheet-shaped appearance, which is prepared by adopting the mixed solvent thermal method, has the advantages of good crystallinity, uniform dimension, controllable shape and good dispersity; and when the monodisperse lithium iron phosphate nanometer material is used as a positive-pole active material of the lithium-ion secondary battery, the lithium-ion secondary battery has high discharge voltage platform and large specific capacity.

The invention discloses a solvent-thermal method for preparing single-phase bismuth titanate Bi2Ti2O7. Bismuth nitrate and butyl titanate are taken as raw materials, and the method is characterized by comprising the following steps of: dissolving the bismuth nitrate in alcohol serving as a solvent, and adding the butyl titanate and ether, wherein the using amount of the bismuth nitrate is lower than the stoichiometric ratio; uniformly mixing, and reacting at the temperature of between 110 and 230DEG C in an enclosed reaction kettle; and cooling, filtering and drying a solid, and calcining at the temperature of between 450 and 550DEG C to obtain the single-phase Bi2Ti2O7. The prepared bismuth titanate compound has a single-phase structure, is spherical nanoparticles, and has excellent solar photo-catalytic activity. The method has the advantages of low synthesis temperature, high powder purity and the like, the preparation process is simple, the raw materials are readily available, thecost is low, and the equipment is simple, and easy to operate.

A preparation method of an MOFs tube type hybrid membrane for separating aromatic hydrocarbons / alkyl hydrocarbons, and belongs to the technical field of membrane separation. The method comprises the steps: preparing MOFs particles by a solvent thermal method; preparing an MOFs / polymer membrane liquid by a co-mixing method, carrying out ultrasonic dispersion, and standing for defoaming; compounding the MOFs / polymer on the outer surface of a ceramic porous membrane modified by a silane coupling agent through a dynamic compression method, and forming a thin membrane separation layer; and drying the hybrid membrane for 0.1-4 h at the temperature of 30-120 DEG C, to enhance the stability of the separation layer. The invention provides the new preparation method of the MOFs hybrid membrane for separating the aromatic hydrocarbons / alkyl hydrocarbons, the process is simple, and the prepared hybrid membrane has good pervaporation performance, and the mechanical strength is improved to a larger degree.

The invention discloses a multistage pore-structure molecular sieve, particularly discloses a ZSM-5 zeolite molecular sieve catalyst, relating to the field of inorganic materials and catalysts. The ZSM-5 type zeolite molecular sieve has grain size between 0.1 micrometer and 20 micrometers and comprises a microcellular structure and a mesoporous structure, wherein the microcellular structure has the aperture of 0.5-2 nanometers, and the mesoporous structure has the aperture of 2-15 nanometers; and the mole ratio of SiO2 / Al2O3 is 30-500. A preparation method comprises the following steps of: directly adding a high molecular polymer polyaniline to a molecular sieve original solution by taking an organic template agent tetrapropylammonium bromide, silicic acids and aluminum salt as raw materials; synthesizing the ZSM-5 zeolite molecular sieve by adopting a hydro-thermal method; crystallizing, and then baking to remove the organic template agent and the polyaniline.

The invention relates to a preparing method of a simple substance bismuth / bismuth compound nanocomposite with oxygen vacancies. The method includes the following steps that a certain amount of bismuth nitrate pentahydrate and precursors are added into ethylene glycol, centrifugal washing is performed on obtained products after a solvent thermal condition reaction so that residual impurities can be removed, drying and cooling are performed, and then the simple substance bismuth / bismuth compound nanocomposite with the oxygen vacancies can be obtained. The method has the advantages that firstly, the method is universally applicable; secondly, the ethylene glycol serves as a solvent and a reducing agent, the oxygen vacancies and simple substance bismuth are produced through weak reducibility of the ethylene glycol, other reducing agents do not need to be added, and the defect that control is difficult because other reducing agents need to be added is avoided; thirdly, the simple substance bismuth / bismuth compound nanocomposite with the oxygen vacancies can be synthesized and is uniform in size; fourthly, a solvent thermal method is adopted, the synthesizing technology is simple, production cost is effectively reduced, and large-scale production of products can be achieved.

The invention provides a method for preparing gold and silver nanoparticles with a hydro-thermal method. The method comprises the following step of: reducing metal ions into corresponding metal nanoparticles by taking citric acid as a reducing agent under a hydro-thermal condition. The method has a simple process and low cost; and the prepared gold and silver nanoparticles are crystalline and have high purities and controllable particle diameters. The method can be applied to the fields such as chemical catalysis, cosmetics and biology and the like.

A method and composition for generation of a microbubble from a nanoparticle through a non-thermal method, preferably featuring nucleation.

The invention provides a sol-solvent thermal method for synthesizing a nanocrystalline oxide powder. The method comprises the following: (1) a step of preparation of inorganic salt mother liquids, during which the inorganic salt taken as a material is dissolved in an organic liquid medium or water to prepare a mother liquid of the inorganic salt with definite concentration; (2) a step of preparation of a precipitation reactant liquid, during which alkali is dissolved in an organic liquid medium or water, proper quantity of surfactants are added to prepare the precipitation reactant liquid with definite concentration; (3) a step of preparation of sols, during which, at a certain temperature, while stirring, the prepared reactant liquid is slowly added in the prepared mother liquid of the inorganic salt, the reactant liquid and the mother liquid of the inorganic salt are kept reacting for a period of time after adding the reactant liquids in the mother liquid of the inorganic salt, and the transparent sols are obtained; and (4) a step of solvent thermal reaction of the sols, during which the prepared sols are put in a reaction kettle and reacted for a period of time under a certain temperature and pressure, the products obtained are subjected to filtering, washing and drying, and the nanocrystalline oxide powder is obtained.

The invention relates to an antiseptic method of leechee, wherein the invention uses antiseptic polypropylene non-woven cloth, to prepare different fresh-keeping bags, and packs dibutyl fumarate into common non-woven cloth to prepare the non-woven package, while the mass ratio between leechee and fresh agent is 10000:0.1-2; then putts leechee into the fresh-keeping bags, uses lines to tie the bag or uses thermal method to seal the bag, putts into ventilate package box, or putts packed leechee into bamboo frame to be put into fresh-keeping bag. The invention can store leechee at 0-5Deg. C for 30-35days. When the leechee is treated with sulfur, the leechee can be stored at 0-5Deg. C for 90-100day.

The invention provides a nitrogen and oxygen storage catalyst with hydrotalcite-like compound as precursor. The formula of the catalyst is CoxM1-xAlyM'1-yOm. The compositions and contents (calculated according to weight percent) of each component are: cobalt oxide (CoO), 0 to 70 percent; and alumina Al2O3, 5 to 20 percent. 0M refers to magnesium oxide (MgO) or Calcium oxide (CaO); M` refers to lanthanum oxide La2O3 or other oxides of transition metal elements, such as copper, strontium, cerium, manganese, iron, zirconium or titanium. The invention adopts coprecipitation method or hydro-thermal method to prepare catalyst, so the cost is low and the preparation process is simple. The catalyst of the invention is used to store nitrogen oxide of lean-burn gasoline engine or diesel engine in oxygen rich atmosphere. The nitrogen dioxide is absorbed on the catalyst in the form of nitrate or nitrite to be stored. The catalyst still has relatively good storage performance of nitrogen dioxide in case of existence of carbon dioxide and water, and has great anti-oxidation performance and wide application prospects.

The present invention discloses a trinickel disulfide film electrode directly grown on a foam nickel substrate and a preparation method thereof. The foam nickel is used as the substrate and a nickel source, thiourea is used as a vulcanizing agent, and glycol is used as a solvent. The trinickel disulfide film electrode directly grown on a surface of the foam nickel is obtained through a simple solvent thermal method. The preparation method has the advantages of simple process and low costs, and is applicable to large-scale industrial production. The present invention further discloses application of the trinickel disulfide electrode. The trinickel disulfide film electrode has a porous nanometer structure, so that a material and an electrolyte can contact fully. The trinickel disulfide grows on the nickel source, that is, the foam nickel, and is firmly combined with the substrate, so that the electric charge can be transferred rapidly. The prepared trinickel disulfide has high rate performance and excellent circulation stability, and is an ideal super capacitor electrode material.

The invention belongs to the technical field of controllable preparation and application of nano materials, and in particular relates to a magnetic Fe3O4 polymer submicron sphere prepared by a hydro thermal method and application thereof. Ferric salt is taken as an iron source, polymer glucan, chitosan or polyacrylic acid is taken as a surfactant, and the magnetic Fe3O4 polymer submicron sphere, namely the surface of a magnetic Fe3O4 is coated with the glucan, the chitosan or the polyacrylic acid, is prepared by the hydro thermal method at one step. According to the difference of functional groups of the polymer, the magnetic Fe3O4 polymer submicron sphere can be combined with different functional molecules to realize different application in biology. The size, uniformity and monodispersity of the three types of magnetic Fe3O4 polymer submicron spheres can be better controlled through reaction conditions, and the size of the spheres is between 200 and 1,000nm.

The invention discloses a hydro-thermal synthesis method for a copper-zinc-tin-sulfur photoelectric material, belonging to the field of preparation of inorganic nano materials. The method comprises the following steps of: dissolving a zinc salt, a tin salt and a cupric salt into a solvent in the molar ratio (0.5-6):(0.3-1):(0.5-2), adding a sulfur-containing compound of which the mole number is 1-4 times of the total mole number of the metal salts and 0-1 millimole of surfactant and reacting at 150-220 DEG C for 5-48 hours; and centrifuging and drying to obtain copper-zinc-tin-sulfur photoelectric material powder. In the method, tetragonal-phase copper-zinc-tin-sulfur photoelectric material powder and orthogonal-phase copper-zinc-tin-sulfur photoelectric material powder are synthesized respectively with a hydro-thermal method and an ethylene diamine-assisted hydro-thermal method; and the method is easy to operate, has high repeatability and low cost, and is easy for realizing mass production.

The invention discloses hydrophobic water-based fluorescent polyurethane paint and a preparation method thereof and relates to fluorescent materials and preparation methods thereof. The hydrophobic water-based fluorescent polyurethane paint is transparent water-based fluorescent type polyurethane emulsion and composed of polyurethane phases and inorganic fluorescent quantum dots. The preparation method of the paint comprises the steps that a self-emulsifying method is adopted, diisocyanate, dihydric alcohol, hydrophilic chain extenders, siloxane, fluorine-containing acrylic resin and the like are selected as raw materials for preparing water-based polyurethane emulsion which is high in transparency and good in hardness, then a hydro-thermal method is adopted for preparing CdTe quantum dot aqueous solutions different in grain diameter, the polyurethane emulsion is mixed with the different CdTe quantum dot solutions according to different proportions, the fluorescent type water-based polyurethane emulsion is obtained, finally cross-linking agents are added for conducting paint film curing, and the water-based fluorescent type polyurethane paint high in coating performance is obtained. According to the hydrophobic water-based fluorescent polyurethane paint and the preparation method thereof, through the design for polyurethane and adjustment on the percentage of the added quantum dots, a series of fluorescent paint are obtained, and the paint is short in drying time, excellent in hydrophobic performance high in hardness and great in cohesiveness with a substrate.

The invention relates to a preparation method of a bore diameter adjustable hierarchical pore metal organic skeleton nanometer material. The preparation method comprises the following steps: synthesizing terephthalic acid with a zircon salt at the existence of a conditioning agent through a solvent thermal method to form a micropore zirconium-based metal organic skeleton; activating the microporezirconium-based metal organic skeleton with a low boiling point solvent and then drying to obtain an activated micropore zirconium-based metal organic skeleton; and dispersing the activated microporezirconium-based metal organic skeleton into 0.8 to 5.6 mol / L of monocarboxylic acid at the temperature of 25 to 180 DEG C for etching so as to obtain the hierarchical pore metal organic skeleton nanometer material. The invention also relates to the obtained bore diameter adjustable hierarchical pore metal organic skeleton nanometer material and application thereof. In short, according to the preparation method in the invention, a part of micropores is retained in the process that hierarchical pores are formed through etching of monocarboxylic acid, so that the obtained hierarchical pore metalorganic skeleton has chemical stability and heat stability similar to those of an original micropore skeleton.

The invention discloses a method for organically modifying attapulgite, which is characterized in that: attapulgite clay and glucose are taken as raw materials to prepare an attapulgite / carbon nano composite material by a hydro-thermal method, and the composite material is to load 10 to 20 mass percent amorphous carbon containing -CH functional groups on the surface of an attapulgite crystal. The surface of the material is rich in the -CH functional groups, and has organophile property. Compared with attapulgite green ore, the composite material improves the rate for removing organic pollutant phenol in wastewater by more than 2 to 3 times. The method has mild conditions for organically modifying the attapulgite and simple process; and the obtained attapulgite contains hydrocarbon functional groups, has higher capacity of adsorbing the organic pollutants such as the phenol in water, and can be used for advanced treatment on the organic pollutants in the water or organic advanced processing and treatment on the attapulgite.

The present invention discloses a preparation method of a [Beta]-Ga2O3 nano array. The method comprises: employing a water bath method to prepare a GaOOH seed layer, employing a hydro-thermal method to prepare a GaOOH nano array on the seed layer, and finally obtaining a [Beta]-Ga2O3 nano array through thermal annealing. The preparation method of the [Beta]-Ga2O3 nano array is a green chemistry method and employs the chemical method seed layer and the nano array, the array is neatly arranged, the dimension is uniform, the preparation method is simple and low in cost and easy to popularize so as to facilitate large-scale preparation, the GaOOH seed layer is prepared, and a substrate is not limited and can be quartz, silicon, a transparent conductive substrate (ITO or FTO), sapphire (C-AL2O3) and the like so as to facilitate different applications.

The invention provides a preheating method and device suitable for powder laying type additive manufacturing, and belongs to the technical field of additive manufacturing. A movable type plane heating plate capable of covering a whole powder bed is arranged over the powder bed, the mounting height of the plane heating plate is slightly larger than a powder laying device, in the powder laying process, the powder bed and parts are preheated, after powder laying is finished, a plane light source is closed and put away, and the phenomenon that in the machining process, the plane heating plate blocks a high-energy beam is avoided. In the heating process, a temperature measuring sensor is used for monitoring the temperature of the powder bed in real time, a control system is adopted to implement feedback control over preheating of the powder bed according to the temperature monitoring result, full-breadth covering type heating is adopted, and the powder bed and formed parts are subject to high-temperature, efficient and unifier preheating. The invention further provides the device achieving the above method. The method is wide in application material and high in expansibility and is particularly suitable for powder laying type additive manufacturing of multiple large-breadth high-energy beams.

The invention relates to a BiOXs pholocatalyst, a grapheme-compounded BiOXs pholocatalyst and a preparation method thereof and relates to the field of photocatalytic materials. According to the invention, the BiOXs pholocatalyst is prepared by utilizing a solvent thermal method, so that the BiOXs pholocatalyst has excellent photocatalytic performances and is especially capable of efficiently degrading organic pollutants under visible light. Photocatalytic performances of the BiOXs pholocatalyst can be further improved by compounding with grapheme in-situ. The BiOXs pholocatalyst, the grapheme-compounded BiOXs pholocatalyst and the preparation method have the advantages of simple manufacturing process, simplicity in operation, low manufacturing cost, small pollution and one-step compounding process.

The invention discloses a preparation method of a WO3 nano-sheet array. The preparation method comprises the following steps: firstly, growing WO3-x.H2O nano-sheet array thin films with oxygen defects on surfaces of FTO (Fluorine-doped Tin Oxide), carbon cloth and a silicon wafer through an oxalic acid, ethanol and tungsten hexachloride solvent-thermal method; calcining in a muffle furnace at certain temperature to obtain the WO3 nano-sheet array with a relatively good crystallization property. WO3 prepared on a substrate represents a regular and vertically aligned nano-sheet array, so that the specific surface area of the WO3 nano-sheet array is greatly improved; the light current of a WO3 nano-sheet reaches 0.8mA / cm<2> in 0.5ml / L of Na2SO4 electrolyte under 0.7 sunlight light intensity and bias voltage of 1.2V. The method disclosed by the invention is simple and convenient to operate and easy to control; a WO3 nano-sheet array thin film prepared by the method has a large specific surface area and high photoelectric chemical activity and stability.