197results about How to "Low requirements for preparation conditions" patented technology

The invention discloses fluorescent carbon quantum dots as well as a preparation method and an application thereof. The preparation method of the carbon quantum dots comprises the steps of adding secondary water into malic acid (or malic acid and ethanol amine, or malic acid and ethane sulfonic acid), which serves as a raw material, carrying out ultrasonic treatment so as to obtain a clarified solution, putting the clarified solution into a microwave oven, reacting for 5-20 minutes so as to obtain solid, dissolving, filtrating, and dialyzing, so as to obtain undoped (or nitrogen-doped, or sulfur-doped) water-soluble fluorescent carbon quantum dots. The preparation process of the carbon quantum dots disclosed by the invention is simple, and the prepared carbon quantum dots are stable in optical property and good in biocompatibility. The carbon quantum dots disclosed by the invention can be applied to the fields of the analysis and detection on Fe<3+> in water, the biological imaging of living cells, fluorescent ink and the like.

The invention discloses a method for preparing high-yield carbon quantum dots, which comprises the following steps that: (1) ammonium citrate is put into an electric heating furnace, the temperature rises at a heating rate of 5 to 50 DEG C / min, and the reaction is carried out for 2-4h at a temperature of 150 to 250 DEG C to obtain a pyrolysis product; (2) the pyrolysis product is milled into powder and added with ethanol to be stirred and centrifuged to remove insolubles to obtain a brown ethanol solution containing carbon quantum dots; and (3) the drying is carried out to obtain the carbon quantum dots. The process is simple to operate, the source of raw materials is wide, the cost of raw materials is low, the preparation conditions has low requirements and are relatively mild, the yield of obtained carbon quantum dots and the quantum yield are higher, the problems that the carbon quantum dots can not be produced on the scale and the fluorescence quantum yield of the obtained carbon quantum dots is low due to the limit of the process and the raw materials in the traditional preparation method of the carbon quantum dots can be solved, and the method can be applied to the fields such as biomarker, bio-imaging, a photovoltaic device, and a biosensor.

The invention discloses a preparation method and an application of a Cd / CdS heterojunction visible light photocatalyst rich in sulfur vacancies. The method comprises the following steps: synthesizingan intermediate CdO / CdS composite material through a thermal treatment technology by using CdS prepared by a solvothermal technology as a precursor, and performing an in-situ chemical reduction technology by using sodium borohydride to directly obtain the Cd / CdS heterojunction visible light photocatalyst. The prepared Cd / CdS composite visible light photocatalyst contains a lot of sulfur vacancies,so the absorption and the utilization of visible lights by the catalyst are greatly improved, and the contact between highly-conductive Cd and CdS is close, thereby the photogenerated electrons can be well separated from holes, and the photocatalytic efficiency is high. The heterojunction photocatalyst has a high stability, has an excellent photocatalytic activity under the irradiation of visiblelights, and can be used for catalyzing photodegradation of water to produce hydrogen. The preparation method has the advantages of low requirements of preparation conditions, simplicity in operation,cheap and easily available raw materials, environmental protection, high visible light catalysis efficiency, and broad application prospect in the photocatalysis field.

The invention relates to a method for preparing micro-fibrillated nanocellulose by use of degummed ramie. The degummed ramie is used as a raw material and is crushed into short fibers by a physical-mechanical method, then the short fibers are soaked with distilled water, and then are prepared into cellulose pulp by a beating machine; the cellulose pulp is ground continuously in a reciprocating manner by an ultra-fine refiner to enable the cellulose to be stressed in a refining manner to obtain suspension liquid; and finally, the nanocellulose and water are separated by a centrifugal washing method, and drying is carried out by a vacuum freezing method to finally obtain the powdery micro-fibrillated nanocellulose. The method is simple, has high efficiency, raw material price is low, no chemical agent needs to be added, the energy consumption is low, pollution is slight, the control is easy, and the prepared micro-fibrillated nanocellulose has high yield, good repeatability and good performances and has important scientific significance and considerable application prospect.

Disclosed is a preparation method of grapheme. The preparation method of the grapheme comprises the following steps: graphite powder is added to non-water polar solvent dissolved with acene condensed nucleus arene derivative to form a mixed system; the mixed system is shocked, washed, centrifuged and filtered to obtain grapheme solution. The preparation method of the grapheme is not high in requirements for preparation conditions, simple in preparation process, good in quality of obtained grapheme, almost free of structural defects and considerable in productivity.

The invention relates to the field of graphene foam composite materials, and in particular relates to a porous flexible polymer-based graphene foam material and a preparation method thereof. According to the flexible polymer-based graphene foam material provided by the invention, in the foam material, polymer foam accounts for 90-99.9wt%, and graphene accounts for 0.1-10wt%. Compared with the prior art, the volume of the flexible polymer-based graphene foam material provided by the invention can be prepared as required; and the flexible polymer-based graphene foam material has excellent compression and resilience mechanical properties, electrical conductivity and surface hydrophobicity.

The invention relates to a preparation method and application of a modified Fe3O4@MOF composite material, belonging to the technical field of material preparation. According to the invention, super-paramagnetic ferriferrous oxide nanoparticles are prepared by using a solvothermal method; a layer-upon-layer self-assembly method is utilized for deposition of metal central ions and organic ligand on the surface of super-paramagnetic ferriferrous oxide used as a core so as to realize in-situ synthesis of a Fe3O4@MOF composite material; and the Fe3O4@MOF composite material is subjected to surface modification so as to obtain the modified Fe3O4@MOF composite material. The modified Fe3O4@MOF composite material is applicable to adsorption of heavy metal mercury ions in industrial waste water.

The invention discloses a preparation method of molybdenum carbide microspheres. The method comprises the following steps of: (1) adding strongly alkaline anion exchange resin to a molybdate solution, carrying out stirring reaction at a room temperature, obtaining a molybdenum ion-resin compound through washing and suction filtration, and drying the molybdenum ion-resin compound to obtain ion exchange resin microspheres containing a molybdenum element; and (2) putting the ion exchange resin microspheres containing the molybdenum element obtained in the step (2) into a ceramic crucible, roasting the microspheres at 700-1,000 DEG C in the presence of an inert gas for 1-4 hours, and naturally cooling the product to a room temperature to obtain the molybdenum carbide microspheres. The invention further discloses application of the molybdenum carbide microspheres in hydrogen production through electrolysis of water. The preparation conditions are low in demands; the raw materials are cheap and available; the prepared molybdenum carbide microspheres have electrochemical activity of catalytic low overpotential and good stability.

The present invention relates to a method capable of hydrolyzing algae bloom cyanophyte to obtain free amino acid. Said method includes the following steps: placing dehydrated algae bloom cyanophyte whose water content is 75-97% into a reaction still, adding concentrated sulfuric acid or concentrated hydrochloric acid whose added quantity is 15-30% of dehydrated cyanophyte volume, making reaction for 5-8hr, then adding catalyst which can be zinc salt and / or copper salt, continuously making reaction for 2-5hr so as to obtain acid cyanophyte solution, controlling temperature of reaction still at 100-120 deg.C, cooling, acid cyanophyte solution to normal temperature, then regulating its pH value to 6-7 by using alkaline neutralizing agent, evacuating and filtering so as to obtain water preparation containing rich amino acid, making said water preparation containing rich amino acid undergo the process of spray-drying or freeze-drying or vacuum drying treatment so as to obtain powder preparation containing rich amino acid.

The invention is applicable to the field of material preparation, and provides a preparation method of a gallium nitride self-supporting substrate, which comprises the following steps: preparing a uniformly distributed gallium nitride nanocolumn array by electron beam evaporation, electrochemical corrosion and etching, and putting the gallium nitride nanocolumn array in a reaction chamber to grow a gallium nitride film. The preparation method provided by the invention lowers the dislocation density of the gallium nitride epitaxial layer, the dislocation density distribution is uniform, and the gallium nitride self-supporting substrate can be conveniently stripped. The method has the advantage of low facility request, is simple and easy to implement, and is applicable to both scientific experiments and mass production.

The invention discloses a nuclear magnetic resonance testing planar micro coin and a method for production. A planar micro coin (1) takes a spiral shape and is located on the upper surface of an insulating substrate (2), and the planar micro coin (1) is made of copper. The material of the insulating substrate (2) is glass or polymer. The planar micro coin (1) is provided with an inside end pad and an outside end pad (4, 5), the planar micro coin (1) is integrated with the corresponding two ends pads, and thereby a copper micro electroplating is formed. The thickness of the pads (4, 5) is same with the thickness of the planar micro coin (1). The method for production of the planar micro coin (1) comprises a photoresist mask process and a copper micro electroplating process, wherein the photoresist mask process is used for making masks which are used for micro electroplating, while the copper micro electroplating process is used for making the planar micro coils of micrometer structure preciseness in photoresist mask. The planar micro coils of the invention can be used for component and molecular structural analysis of nuclear magnetic resonance upgrading samples, and can be used for nuclear magnetic resonance micro-imaging as tests for mono cells.

The invention discloses a multi-color fluorescent carbon quantum dot and a preparation method and application thereof, and relates to a multi-color fluorescent carbon quantum dot and a preparation method thereof. The preparation method comprises the following steps of: putting ammonium citrate and urea into a reaction container, adding dimethylformamide, fully stirring to obtain a transparent clear solution, transferring the clear solution into a high-pressure kettle, putting the high-pressure kettle into a drying oven, and keeping the temperature at 150-200 DEG C for 14 hours to obtain a carbon quantum dot solution. The carbon quantum dot prepared by the invention has the advantages of controllable light emitting color, excellent optical performance, strong fluorescence, high quantum yield, stability, small influence of acid-base environment and the like. The raw materials of the multi-color carbon quantum dot prepared by the method are cheap and easily available, the experimental repeatability is high, the operation is simple, the preparation time is short, and large-scale production can be realized. The multi-color fluorescent carbon quantum dot is applied to the fields of bioluminescence labeling, white light illumination and the like.

The invention relates to a method for preparing a titanium dioxide coating on the surface of carbon fiber. The method is characterized by comprising the following steps of: mixing titanium alkoxide with absolute ethyl alcohol according to a proportion of 1: 4 to form a sol mixture, and adjusting a pH value to 1-2 through acetic acid; drying the carbon fiber for 30min at a temperature of 100 DEG C, soaking the carbon fiber to the sol mixture, and clamping and pressing the carbon fiber by using an automatic padding machine so that the sol mixture is coated onto the carbon fiber; when the sol mixture is uniformly coated onto the carbon fiber, drying for 10min at a temperature of 80 DEG C for evaporating residual ethanol; and then curing at a temperature of 100 DEG C. According to the invention, the sol mixture is formed at normal temperature, so that requirements on manufacturing conditions can be greatly reduced. According to the method disclosed by the invention, thickness of the coating can be controlled. The carbon fiber with the titanium dioxide coating prepared by using the method disclosed by the invention keeps the flexibility and the knittability of coating-free carbon fiber, and simultaneously solves the problems that interfacial wettability and compatibility between the carbon fiber and certain composite material substrates are poor.

The invention discloses a preparation method of a sulfonic acid group modified super-paramagnetic nano material, and belongs to the field of material preparation and industrial wastewater treatment. The method comprises the following steps: preparing super-paramagnetic ferroferric oxide nanoparticles by using a coprecipitation method; by taking super-paramagnetic ferroferric oxide as a core, coating mono-dispersed spherical silicon dioxide nanoparticles on the surface of ferroferric oxide by using a stOber method; on the basis of coupling reaction principle, modifying on the core coated by silicon dioxide; and by taking 2-(4-sulfonyl chloride phenyl) ethyl trimethoxy silane as a modification reagent, modifying on a core-shell structure so as to connect the sulfonic acid group. The adsorbent is used for selectively adsorbing the heavy metal copper in sewage, is high in adsorption rate and can be repeatedly used.

The invention belongs to the technical field of oil-gas well development and discloses a temperature-responsive high temperature retarder suitable for oil-gas well cementation, a preparation method thereof and a well cementing slurry. The temperature-responsive high temperature retarder comprises a structural unit A shown as the formula (I), a structural unit B shown as the formula (II) and a structural unit C shown as the formula (III), wherein structural percentages of the structural units A, B and C include x=37.2-57.23%, y=40.52-61.4% and z=1.38-4.35%; the addition of the temperature-responsive high temperature retarder can be adjusted according to cementation design so that thickening time of oil well cement meets the requirements of well cementing construction, and the temperature-responsive high temperature retarder helps effectively improve thickening performance of cement slurry and improve early strength of top set cement during well cementation.

The invention relates to a high temperature titanium alloy precision casting method based on a rapid prototyping and relates to a casting method. The high temperature titanium alloy precision casting method solves the problems that the preparation technology is complex, the cost is high and a high temperature titanium alloy part with a complex shape is difficult to obtain in the existing method. The method comprising the following steps: 1, rapidly make mould to obtain a cere; 2, make a shell mold; 3, roast; 4, pour a high temperature titanium alloy casting; 5, post treat, the high temperature titanium alloy casting is obtained after cleaning shell, spraying sand, annealing, finishing and pressure maintaining. The preparation technology of the invention is simple, the cost is low, the design is flexible, thereby being capable of volume production, and the high temperature titanium alloy part with the complex shape can be obtained.

The invention relates to a detection method for molecular weight of polyethylene. The method comprises: (1) adopting a dynamic rheometer to carry out frequency scanning measurement for a polyethylene sample in a linear viscoelastic region; (2) calculating a relaxation spectrum distribution width of the polyethylene sample according to the frequency scanning result, and determining the type of thepolyethylene sample according to the relaxation spectrum distribution width; (3) calculating zero shear viscosity of the polyethylene sample according to the frequency scanning result; (4) substituting the zero shear viscosity of the polyethylene sample into a regression formula of the type of the polyethylene sample to calculate the molecular weight of the sample, wherein the regression formula is as the follow: eta0= K(MW)<alpha>. According to the present invention, no solvent pollution is generated when the method is adopted to carry out testing; the method is easy to operate, and providesgood adaptability for the whole structure of the polyethylene sample; with considering the different dependency relationships between the zero shear viscosity of the polyethylene with the different types and the molecular weight, the method has wide applicability.

A process for preparing a coated TiO2 layer on an object includes such steps as proportionally mixing the precursor of TiO2 with an acidic solvent to obtain a sol mixture, and immersing the object (fabric) in it to form a coated TiO2 layer for obtaining the antibacterial and self-cleaning functions.

The invention discloses a composite protective film with a silane transition layer, a preparation method thereof and a product. The composite protective film with the silane transition layer comprisesthe silane transition layer and a coating, wherein the silane transition layer is formed by plasma chemical vapor deposition of organosilane. After forming the silane transition layer, the coating isformed by a first monomer and a second monomer through the plasma chemical vapor deposition on the silane transition layer, wherein the first monomer is selected from one or two of a low dipole moment organic monomer and a polyfunctionality acrylate chemical compound, and the second monomer is a fluorine carbonate chemical compound.

The invention relates to a preparation method for a carbon quantum dot fluorescent probe used for detection of the concentration of nitric oxide in organisms. The carbon quantum dot is a powdery solidwith excellent water solubility, is synthesized from citric acid and L-cysteine through a microwave-assisted method, and has extremely high quantum yield which is up to 85%. The preparation method for the carbon quantum dot comprises the following steps: 1) dispersing and dissolving the citric acid and the L-cysteine in deionized water; 2) carrying out stirring and ultrasonic dispersion, and allowing the citric acid and the L-cysteine to be uniformly dispersed in a solution; 3) transferring a mixed solution into a microwave oven, and carrying out heating for 2 to 8 min; 4) carrying out cooling to a room temperature, adding water, and carrying out dissolving; 5) transferring an obtained solution into a centrifuge, and carrying out centrifuging at a high speed; and 6) subjecting a centrifuged solution to filtering and drying operations so as to prepare the carbon quantum dot. The carbon quantum dot prepared by using the method provided by the invention has the advantages of high fluorescence quantum yield, good chemical stability, photobleaching resistance and biological compatibility, and applicability to detection of the concentration of the nitric oxide in the organisms.

The invention provides a method for manufacturing nano pipes. The method comprises the following steps of: dripping nano materials or an assembly of the nano materials to a support covered with a carbon film to obtain a compound carbon film; cracking the compound carbon film to obtain a cracked compound carbon film; and illuminating the cracked compound carbon film by using electron beams for crimping to obtain the nano pipe. By the method, the nano pipe can be obtained only through 3 steps, the manufacturing requirement is relatively low, and an expensive instrument is not required; the method is simple; and the nano pipe is formed by the carbon film crimped cladding nano materials or the assembly of the nano materials, and the method does not have limits on the nano materials or the assembly of the nano materials, so that the method is suitable for assembling a plurality of kinds of nano materials.

The invention relates to a deoxidation and organic sulfur hydro-conversion bifunctional catalyst, and a preparation methods and an application thereof, and belongs to the technical field of gas purification. The catalyst, by oxide, comprises, by mass, 1-50 parts of an active component, 0.1-20 parts of an active assistant and 30-89.1 parts of a carrier. The invention also relates to three preparation methods of the catalyst. The catalyst has deoxidation and organic sulfur hydro-conversion bifunctions, and can be used in the purification process of raw gases of sulfur-containing and CO-and-H2-containing industrial coal-to-water gas, semi-water gas, coke oven gas and carbide furnace gas. The catalyst can simultaneously realize deoxidation and organic sulfur hydro-conversion purposes, shortens the process flow, simplifies the flow, reduces the energy consumption and saves the cost. The preparation methods of the catalyst have the advantages of simplicity, strong operability and low preparation condition requirements. The catalyst has a high deoxidation rate and a high organic sulfur hydro-conversion rate, and allows the volume content of oxygen in an obtained product obtained after deoxidation to be lower than 100ppm and the organic sulfur conversion rate to be greater than 95%.

A method for preparing a three-dimensional graphene / high molecular polymer composite material by reinforcing a three-dimensional graphene skeleton structure includes adding carbon nanofibers into graphene oxide, adding a reducing agent and high molecular polymer, and preparing that three-dimensional graphene / high molecular polymer composite material; 3-dimensional graphene aerogel are prepared byadding carbon nanofibers into that 3-dimensional graphene for the first time and drying under normal pressure; Polymer-encapsulated three-dimensional graphene aerogels were used to prepare compositesfor the first time. Carbon nanofibers and graphene have the same preparation method and source, so they have similar properties with graphene. The addition of carbon nanofibers has little effect on the conductivity of graphene, and the preparation process reduces the cost of drying process, which provides a new method for the production of three-dimensional graphene-based composites.

The invention discloses a preparation method and application of a modified superparamagnetic Fe3O4 nanoparticle, belonging to the field of treatment of industrial wastewater. The method comprises the following steps of preparing the superparamagnetic Fe3O4 nanoparticle by adopting a coprecipitation method; by taking superparamagnetic Fe3O4 as a core, coating the surface of Fe3O4 with one or more layers of silica shells by adopting hydrolysis; modifying coated silica by applying a coupled reaction principle; by taking 3-aminopropyl trimethoxysilane as a modification reagent, modifying on a core-shell structure and connecting to an amino group; finally, using chloromethyl thiirane to synthesize a chelate which simultaneously contains nitrogen and sulfur by a nucleophilic substitution reaction; then using the chelate to adsorb heavy metal mercury, and in particular to selectively adsorb Hg<2+> at normal temperature, wherein the adsorption efficiency of the chelate is significantly higher than that of a chelate which is previously synthesized and only contains a sulfur ligating atom. The modified superparamagnetic Fe3O4 nanoparticle has the advantage of easiness in recovery and regeneration.

The invention discloses a preparation method and application of a modified superparamagnetic Fe3O4 nanoparticle, belonging to the field of treatment of industrial wastewater. The method comprises the following steps of preparing the superparamagnetic Fe3O4 nanoparticle by adopting a coprecipitation method; by taking superparamagnetic Fe3O4 as a core, coating the surface of Fe3O4 with one or more layers of silica shells by adopting hydrolysis; modifying coated silica by applying a coupled reaction principle; by taking iminodiacetic acid as a modification reagent, modifying by adopting a nucleophilic reaction to obtain the modified superparamagnetic Fe3O4 nanoparticle; then using the superparamagnetic Fe3O4 nanoparticle to adsorb heavy metal chromium, and in particular to selectively adsorb Cr<6+> at normal temperature. The modified superparamagnetic Fe3O4 nanoparticle has the advantage of high adsorption efficiency.

The invention relates to a superconducting material and a preparation method thereof, and belongs to the technical field of functional material manufacturing. The chemical formula of the superconducting material is CuxNbSe2-ySy (0<=x=y<=0.1). The preparation method is a traditional high-temperature solid-phase method. Simple substances Cu, Nb, Se and S in a stoichiometric ratio are fully ground, vacuumized and sealed in a quartz tube, then the quartz tube is vacuumized and sealed at high temperature, finally, the sealed quartz tube containing the raw materials is placed in a furnace to be sintered for four days at 850 DEG C to obtain polycrystalline powder of CuxNbSe2-ySy (0<=x=y<=0.1), then the obtained polycrystalline powder and a simple iodine substance are put into the quartz tube in the mass ratio of 20:1, the tube is placed in a tubular furnace after being vacuumized and sealed to be subjected to heat preservation for seven days, and single crystals of corresponding components are obtained, wherein the tubular furnace is provided with two temperature areas with the temperatures of 700 DEG C and 600 DEG C at the two ends. The physical properties, mainly including conductivity,the magnetic property, the heat capacity and the like, of the superconducting material are tested through a physical property measurement system (PPMS), and finally, it is determined that a target product has superconductivity. The superconducting material is applied to the aspects such as electric power, communication, high-tech equipment and military equipment, and has an indispensable effect and important strategic significance.

The invention provides a preparation method of a composite potassium monopersulfate disinfectant and antibacterial application thereof in water treatment. The preparation method comprises the steps ofsynthesizing monopersulfuric acid with 30% by mass of hydrogen peroxide and 98% by mass of sulfuric acid, and adding potassium carbonate into the monopersulfuric acid in batch manner to obtain the composite potassium monopersulfate. The composite potassium monopersulfate has excellent performance, with active oxygen content of 3.2-3.4%, monthly average active oxygen loss rate of 0.4% and below, and water content of less than 0.08%; the prepared composite potassium monopersulfate has a wide range of antimicrobial effects, features stability, high efficiency and safety and helps environmentallysolve the problem of disinfection and purification in water treatment.

The invention discloses an SO2 and dust comprehensive treatment absorber and belongs to the technical field of desulfurization and dust removal. The absorber is a mixed liquid 8-11 in pH comprising a protein ion membrane liquid and an alkaline liquid; the protein ion membrane liquid is a liquid membrane carrying negative and positive ions that is formed by adding an amphoteric surfactant and a foam stabilizer in a protein fermentation broth. The protein ion membrane liquid forms small-diameter bubbles during spray atomization, greatly increasing specific surface area (thousands of times in this increase), that is to say the area of contact between SO2 and an absorber liquid is increased, better facilitating the trapping of dust and SO2 in smoke; therefore, mass transfer contact residence time of an absorbed gas between gas and liquid phases is much longer than the retention time of the gas in the liquid phase to react with the alkaline liquid, and reaction is given sufficient time, that is to say the reaction time of SO2 with the absorber liquid is prolonged.

The invention discloses a building energy-saving thermal insulation material, which is characterized being prepared from the following raw materials by weight: 15-25 parts of cement, 15-20 parts of blast furnace water granulated slag, 35-40 parts of volcanic ash, 5-8 parts of surface function modified porous hollow aluminum oxide nanofibers, 2-4 parts of rare earth fluoride hollow nano ions, 3-6 parts of Lambda-cyhalothric acid modified aminated beta-cyclodextrin and 1-3 parts of a coupling agent. The invention also discloses a preparation method of the building energy-saving thermal insulation material. The building energy-saving thermal insulation material disclosed by the invention is excellent in comprehensive performance, strong in thermal insulation property, good in aging resistance, weather resistance and flame retardance, excellent in performance stability and mechanical property, green and environment-friendly in use, high in durability, weather resistance, corrosion resistance, freeze thawing resistance and reliability, and wide in application range.