196results about How to "Low requirements for preparation conditions" patented technology

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 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.

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 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.

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 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 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.