323results about How to "The preparation method is simple and quick" patented technology

The invention belongs to the technical field of new material preparation and lubricating oil additives, and discloses a nanometer copper / graphene composite material and a preparation method and application thereof. The preparation method comprises the following steps of: firstly dissolving a copper precursor compound, a surface active agent and a complexing agent into reducing alcohol, then adding graphene oxide, and carrying out ultrasonic dispersion to obtain a mixed solution; then adding a reducing agent to the mixed solution, transferring into a reaction kettle, introducing CO2 gas, and controlling gas pressure and temperature so that CO2 achieves a supercritical state; stirring the mixed solution inside the reaction kettle for reacting, cooling, decompressing, washing by centrifuging, and carrying out vacuum drying to obtain the nanometer copper / graphene composite material. The preparation method disclosed by the invention is simple, saved in time and fast. The prepared nanometer copper / graphene composite material has the characteristics of single phase, controllability in loading capacity, small nanometer copper particle size, uniformity in nanometer copper distribution on the surface of a graphene nanometer layer, and the like, has a synergetic lubricating effect, and can be used for outstandingly improving the antifriction and abrasion-resistant property of basic lubricating oil.

The invention relates to a preparation method of a graphene supported cerium oxide nano cubit composite, belonging to the technical field of cerium oxide composite material preparation methods. The preparation process comprises the following steps: dissolving graphite oxide in deionized water, and carrying out ultrasonic treatment until the solution is dispersed uniformly and appears semitransparent and bright brown; adding cerous nitrate hexahydrate crystal, stirring, adding ammonia water, and pouring into a reaction kettle; reacting at 220-240 DEG C for 12-24 hours; carrying out vacuum filtration on the solution after reaction until the solution becomes neutral; and finally, drying the mud to obtain the graphene supported cerium oxide nano cubic composite with (200) free face. The graphene supported CeO2 nano cubic composite not only has favorable conductivity and high specific area of the graphene, but also has favorable catalytic and luminescent properties and the like of the CeO2; and the preparation method is simple and quick, does not generate pollution, can be operated repeatedly, and can be used for mass production.

The invention relates to the field of a test method and a test device and particularly relates to a sample shelf and a test method for an X-ray diffraction in-situ test. The sample shelf comprises a sample shelf base frame with a sample slot, a positioning plate, a charge-discharge test channel and a conducting wire, wherein the positioning plate is jointed on the sample shelf base frame; the charge-discharge test channel is riveted on the sample shelf base frame; and the conducting wire is welded on the charge-discharge test channel. In the sample shelf provided by the invention, an X-ray powder diffractometer is free from any structural reformation or an operation of adding a functional component, and a polymeric membrane material, which is environmentally-friendly, non-toxic, easily obtained and simply processed, is used as an X-ray transmission window as well as a packaging material of a sample core, thereby realizing the observation and monitoring for crystal structural change of a cathode active material and an anode active material under different voltages during a charge-discharge process and a process of repeating for different times on the basis of preparing the sample core for the X-ray diffraction in-situ test.

The invention discloses a nano-silver / graphene composite material and a preparation method thereof. The nano-silver / graphene composite material is synthesized through the supercritical carbon dioxide (ScCO2) assisted chemical deposition method. Firstly, a silver-ammonia solution is added into reductive alcohol, and an appropriate amount of a surfactant and a complexing agent are dissolved in the reductive alcohol; afterwards, graphene oxide powder is added, and homogeneously dispersed suspension liquid is obtained after ultrasonic dispersion; then a reducing agent is added, mixed liquid is quickly transferred into a reaction kettle, CO2 gas is pumped into the reaction kettle, the reaction kettle is heated to reach set pressure and a set temperature, and at the moment, the CO2 is in a supercritical state; and after a mixed solution is stirred and reacted for a period, cooling and pressure relief are carried out, and the nano-silver / graphene composite material is obtained after repeated centrifugal cleaning and drying. The preparation method is environmentally friendly, and the prepared nano-silver / graphene composite material has the characteristics that the phase is singular, the load capacity is controllable, and nano-silver is small in grain size and evenly distributed between graphene nanosheet layers.

The invention relates to preparation and application of a paper-based microfluidic chip for colorimetric analysis; the preparation comprises the step of enabling a hydrophilic channel to be jointed on a hydrophobic substrate, wherein the hydrophilic channel is obtained by printing the pattern of the channel on a piece of filter paper and then shearing the pattern, and the hydrophobic substrate is obtained by treating the filter paper with a normal hexane solution containing methyl trichlorosilane and octadecyl trichlorosilane; the paper-based microfluidic chip is combined with a colorimetric analysis method, so that rapid quantitative detection can be realized. The preparation method is simple and fast, short in production cycle, low in cost, low in energy consumption and free from pollution. The preparation and the application of the paper-based microfluidic chip for colorimetric analysis are suitable for the fields such as clinical diagnosis, food hygiene, environmental monitoring and biochemistry, thus having very wide application scope.

The invention provides a binding agent for powder injection moulding, a preparation method of the binding agent and an application method of the binding agent. The binding agent is mainly prepared from the following components in percentage by mass: 65 to 75 percent of polyformaldehyde, 4 to 9 percent of dioctyl phthalate, 6 to 13 percent of polyethylene, 1 to 3 percent of acrylate copolymer, 3 to 8 percent of polyacrylamide, 1.5 to 4 percent of paraffin, 2 to 6 percent of microcrystalline wax and 0.5 to 2 percent of ethylene vinyl acetate copolymer. In the binding agent provided by the invention, multiple types of components are combined through scientific compatibility, so that the compatibility between metal powder or ceramic powder and the binding agent can be obviously improved, and meanwhile, the binding agent can be quickly removed in a degreasing process without causing the defects of bubbling and cracking of a green body, so as to guarantee the quality of the green body.

The invention discloses a preparation method for a paper-based micro-fluidic chip. The trimethoxy silane is processed in a heptane solution to obtain a hydrophobic base. Meanwhile, patterns printed on the channel of a piece of filter paper are cut, and then are immersed in cetyl trimethyl ammonium bromide to obtain a hydrophilic base. The above hydrophobic base and the above hydrophilic base are bonded together to form a hydrophilic and hydrophobic access. Compared with the traditional method, the above preparation method is free of any expensive instrument / agent / metal mold, thus being novel, simple, quick, low in cost and short in production period. The entire preparation process can be completed within 7 minutes.

The invention discloses a fractal acoustic metamaterial based broadband acoustic focusing lens and a preparation method thereof. The broadband acoustic focusing lens comprises a base material and a fractal structure unit array located on the base material. The fractal structure unit array is formed by arranging a plurality of fractal periodic units, and each fractal periodic unit corresponds to a refraction point of the focusing lens. The fractal period unit comprises a fractal unit and air, and a refractive index of the fractal unit corresponding to any refraction point conforms to a theoretical refractive index of the refraction point. According to the invention, the fractal units are adopted for the first time to form the acoustic focusing lens, thereby providing a new way for designing a new material for the acoustic engineering. The actual path length of spreading of acoustic waves in a unit structure is increased in a fractal mode, and the refractive index of the unit structure is improved. The acoustic focusing lens disclosed by the invention has a broadband characteristic, and can realize a good focusing effect of the acoustic waves in the scope of a broad band.

The invention discloses a halogen-free flame-retardant bio-based epoxy resin precursor and its preparation method. The preparation method comprises the following steps: firstly, a bio-based phenol monomer, a phosphorus-containing monomer and an aldehyde-containing bio-based phenol monomer are subjected to a simple condensation reaction; and then, the product is subjected to an epoxidation reactionto prepare the halogen-free flame-retardant bio-based epoxy resin precursor. The preparation method has simple process, is simple to operate, has good controllability, is easy to implement, and is suitable for large-scale industrial production. By preparing thermosetting epoxy resin from the bio-based epoxy resin precursor and an amine or anhydride curing agent, the modified epoxy resin can haveexcellent thermal property, mechanical property and flame retardant property, has the possibility of replacing the existing petroleum base products, and has a wider range of application.

The invention provides a chitosan-nanofiber hemostatic material and a preparation method thereof. The chitosan-nanofiber hemostatic material is a core-shell nanofiber, wherein chitosan forms the shell of the nanofiber, polyvinyl alcohol forms the core of the nanofiber, and the diameter of the core-shell nanofiber is 100nm-20Mum. According to the invention, a coaxial electrospinning technology is adopted to prepare the nanometer material with a chitosan-polyvinyl alcohol (CS-PVP) core-shell structure, and the nanometer material has high chitosan content and a high specific surface and is used for hemostasis on living organisms. Experiments prove that the chitosan-polyvinyl alcohol nanofiber, provided by the invention, has good biocompatibility and excellent hemostasis performance, reserves the good water-absorption and fiber forming property of a PVP material, combines the excellent antibacterial hemostasis performance of a CS material, and can be clinically used for wound hemostasis. The preparation method is simple and fast, and has high efficiency.

The invention discloses a single-component epoxy coating which comprises the following components in parts by weight: 12-16 parts of epoxy resin, 22-26 parts of modified epoxy resin, 0.4-0.8 part of a silane coupling agent, 9-11 parts of iron oxide red powder, 22-24 parts of talcum powder, 5-7 parts of anti-rust pigment, 4-7 parts of a dehydrating agent, 1-3 parts of ketimine, 0.2-0.4 part of an antifoaming agent, 2-4 parts of a thixotropic agent and 10-14 parts of a mixed solvent, wherein the epoxy resin, the modified epoxy resin and the ketimine can be dissolved in the same component. Therefore, the coating has the advantage that the traditional single-component epoxy coating is convenient in construction, and also has crosslinking characteristics of double-component epoxy resin coatings.

The invention discloses a flame-proof and electrostatic resistant unsaturated polyester resin for manufacturing glass reinforced plastic gas pipes of coal mines, which comprises the following ingredients (by weight portions): unsaturated polyester resin 100 parts, decabromodiphenyl oxide 22-26 parts, antimony trioxide 3-6 parts, and acetylene carbon black 1.5-3 parts.

The invention discloses a preparation method and application of a three-dimensional porous electrode material. The preparation method comprises the following steps of: respectively dissolving aniline and an oxidant into acidic aqueous solution to obtain aniline solution and oxidant solution; dipping a loofah sponge into the aniline solution; dropping the oxidant solution into the aniline solution at 0 to 4 DEG C in order to implement oxidative polymerization until the loofah sponge is green; taking out the loofah sponge, and drying; and carbonizing the loofah sponge at an anaerobic condition, thus obtaining the three-dimensional porous electrode material. The three-dimensional porous electrode material prepared by the preparation method disclosed by the invention has the advantages that the specific surface area is large, the activity of the electrode material is high, the preparation method is simple and quick, and the cost is low; the three-dimensional porous electrode material can be applied to a microbial fuel cell; and compared with the conventional plate electrode, the three-dimensional porous electrode material has the advantages that the activity peak current value in the reaction of a microbial electrode is increased by more than four times, and the power density of a cell is increased by more than 2.5 times.

The invention discloses an environmentally-friendly cleaning agent, which comprises the following raw materials in part by weight: 1 to 10 parts of organic acid, 50 to 60 parts of vegetable oil, 3 to 16 parts of potassium hydroxide, 2 to 10 parts of coconut oil, 1 to 10 parts of compatibilizer, 1 to 10 parts of glycerin, 1 to 5 parts of phospholipids and 10 to 600 parts of water. The invention stresses on producing a product with economy, good cleaning effect and excellent environmental safety. Compounds such as methylene dichloride, chlorine compound solvents, halogen solvents and chemicals such as arene and the like with destructive performance on an ozone layer are not used; only environmentally-friendly natural components are used; and the environmentally-friendly water-soluble cleaning agent with good cleaning effect is provided. Moreover, in order to maintain the cleaning performance and the rinsing performance of a surfactant, the phospholipids and the coconut oil are used so as to improve the performance of the cleaning agent; and secondary pollution of water is prevented by using the degradable chemicals.

The invention discloses a nitrogen-doped carbon-supported non-noble metal catalyst prepared on the basis of a metal organic framework material, a preparation method of the nitrogen-doped carbon-supported non-noble metal catalyst and application of the nitrogen-doped carbon-supported non-noble metal catalyst in catalytic oxygen reduction reaction. According to the nitrogen-doped carbon-supported non-noble metal catalyst, a metal organic framework material is used as a precursor, the surface of the metal organic framework material is modified with nano carbon powder, carbon cloth is coated with the nano carbon powder, and the nitrogen-doped carbon-supported non-noble metal catalyst is prepared through a transient Joule thermal method. The obtained catalyst has the characteristics of being controllable in component, stable in structure, uniform in distribution, capable of being directly applied to a fuel cell and the like, and has good catalytic activity and excellent catalytic stability in the field of catalytic oxygen reduction reaction of the fuel cell. Compared with a traditional nitrogen-doped carbon-supported non-noble metal catalyst prepared on the basis of a metal organic framework material, the nitrogen-doped carbon-supported non-noble metal catalyst has the advantages of simple preparation process, stable structure and suitability for industrial production, and is a catalyst with a good application prospect.

The invention discloses an ice-crack-shaped polished crystal tile comprising a ceramic tile blank, a coloured glaze layer, an ice crack layer and a transparent frit layer, wherein the coloured glaze layer comprises the following components in percentage by mass: printing glaze, glaze pigment, kaolin, methylcellulose and sodium tripolyphosphate; the ice crack layer is made of ice flower crystals with crystal glaze as the main material. The ice-crack-shaped polished crystal tile is manufactured sequentially through the steps: manufacturing a flower net; blending coloured glaze; pushing-printing the coloured glaze and ice flower crystal powder; pushing-printing frit particles; firing; and polishing. According to the invention, a crystal effect liked by people is integrated into the transparent frit layer of the polished crystal tile to form a snowflake-like natural, clean and varied embedded crystal effect, so that the tile with the novel technology has stronger decorative performance; the manufacturing method of the ice-crack-shaped polished crystal tile is simple and rapid, capable of realizing large-batch mechanical production under the condition of no great change of the original equipment, extremely simple in operation and capable of realizing flexible production for tiles with different deigned styles.

The invention provides a nickel-based core-shell structured nano catalysis material which has a core-shell structure and material composition of Ni@mSiO2@LDO or Ni@mSiO2@LDH. A preparation method of the nickel-based core-shell structured nano catalysis material comprises the steps of: firstly preparing Ni nano particles, coating the surface of a Ni core with a layer of SiO2, coating the surface of Ni@NiO2 with an LDH shell layer, etching by a NaOH solution, carrying out high-temperature calcination, reducing in H2 atmosphere to obtain the black Ni@mSiO2@LDO core-shell structured catalysis material, and carrying out hydration reaction on the Ni@mSiO2@LDO core-shell structured catalysis material in deionized water under the protection of inert atmosphere to obtain the black Ni@mSiO2@LDH core-shell structured catalysis material. The nickel-based core-shell structured nano catalysis material has good activity and selectivity, and can be used for generating a target compound at high selectivity through catalytic hydrogenation by taking an unsaturated compound as a raw material; and the material is uniform in particle, good in dispersity, good in recycling stability, simple in preparation method, and low in production cost and has broad application prospects in the catalysis field.

The invention discloses a method for preparing a magnetic carbon material from a core-shell metal organic framework. The method comprises the following steps: ultrasonically dissolving an organic ligand and metal salt in a solvent in sequence, dropwise adding 2 to 10 drops of fluoboric acid, transferring the mixture into a polytetrafluoroethylene lining reaction kettle, carrying out reaction in a drying oven, and carrying out filtering and drying to obtain a metal-organic framework material; ultrasonically dissolving an organic ligand and metal salt which are used for synthesizing a 'shell' material in the solvent in sequence, dropwise adding 2 to 10 drops of fluoboric acid, adding the metal-organic framework material serving as a core, then transferring the mixture into the polytetrafluoroethylene lining reaction kettle, carrying out reaction in the drying oven, and carrying out filtering and drying to obtain a core-shell metal organic framework material; carrying out high temperature carbonization heating on the core-shell metal organic framework material to obtain the magnetic carbon material. The carbon material obtained through the method is regular in porous structure, uniform in aperture distribution and magnetic, and has good application value for the aspects such as gas adsorption storage and industrial waste separation; furthermore, the method is simple and feasible in preparation process and high in safety.

The invention discloses a preparation method of a nickel phosphide nano film. The method comprises the following steps: (1) cleaning and drying the foam nickel; (2) using the foam nickel after cleaning and drying in the step (1) as an anode, and conducting anodic oxidation by using a DC stable power supply in an oxalic acid solution to obtain nickel oxalate @ nickel foam; (3) placing the nickel oxalate @ nickel foam prepared in the step (2) in the middle of a tube furnace, placing sodium hypophosphite in the downstream of the tube furnace, and setting temperature control procedures in an inert gas stream as below: heating at the rate of 2-4 DEG C / min to 380-450 DEG C, maintaining for 2-4 h, and then cooling to room temperature naturally to obtain the nickel phosphide nano film. The method employs first anodic oxidation, and then low temperature phosphatization to prepare the nickel phosphide nano film. Compared with other methods, the method has no addition of nickel source in the preparation process, and is simple, rapid effective and economical.

The invention relates to a preservation method of an excrement sample, a solution for preservation, a preparation method and application. A corresponding excrement preservation solution can be prepared from materials according to a formula, without the need of complicated operation; collected excrement is directly put into the preservation solution and can reach the effect of stabilizing microorganism components, without the need of special treatment. The collected excrement is mixed with the preservation solution which takes a water-soluble organic solvent as an effective component to prepare the excrement sample which can keep an excellent preservation property of microorganisms in the excrement sample. When the excrement sample is preserved by utilizing the formula, a frozen preservation effect of a sample can be realized under normal temperature, so that sample collection and preservation of the sample can be carried out at any time and long-time transportation of the excrement sample is convenient to realize. The excrement preservation solution provided by the invention is safe and efficient, can be used for maintaining the abundance of bacteria in the excrement for long time, is low in cost and has a good application prospect and economic benefits.

The invention relates to a small-caliber artificial blood vessel with the surface grafted with a heparin coating and a preparation method of the small-caliber artificial blood vessel. A small-caliberblood vessel is adopted as a substrate. The preparation method comprises the following steps: soaking the surface of the substrate in a dopamine solution for reaction, coating the surface of the substrate with multiple layers of polydopamine coatings, performing chemical bond combination grafting with polyethyleneimine, and finally activating heparin by utilizing 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDC) and N-hydroxysuccinimide (NHS) to obtain the heparinized surface through amido bond combination. The invention has the characteristics of small caliber, favorable mechanical properties, hydrophilicity and long-acting anticoagulation; the preparation method is environmentally friendly and efficient in compounding, the prepared heparin coating is uniform, the grafting amount of heparin is higher and can reach 4.9 mu g / cm < 2 >, and good market application prospects are achieved.

The invention relates to a coated cloth and especially relates to a hydrophobic bacteriostasis multifunctional coated cloth and a processing method thereof. The hydrophobic bacteriostasis multifunctional coated cloth comprises a warp knitting fabric, a bacteriostasis coating on the surface of the warp knitting fabric, and a hydrophobic coating on the bacteriostasis coating. The bacteriostasis coating is prepared from 15-20 parts by weight of bamboo fibers, 0.5-2 parts by weight of Wasabia japonica extract, 0.5-2 parts by weight of white gourd kernel extract, 20-35 parts by weight of a polyvinylidene chloride emulsion and 35-45 parts by weight of an acrylate copolymer-paraffin composite emulsion. The hydrophobic coating is prepared from 100 parts by weight of PVC paste resin, 50-80 parts by weight of an eco-friendly plasticizer, 2-5 parts by weight of a stabilizing agent, 0-60 parts by weight of a filler, 0-20 parts by weight of a fire retardant, 0-5 parts by weight of a mildew inhibitor, 0-5 parts by weight of an anti-oxidant, 0-10 parts by weight of a binder and 0-70 parts by weight of hydrophobic nanometer fibers.

The invention provides a processing method for citrus reticulata blanco slices, and belongs to the technical field of Chinese medicinal herb processing. The method comprises the steps of dried fruit preparation, steam softening, slicing and the like, wherein the temperature of steam during steam softening is 50-60 DEG C, and the softening time lasts 5-8 hours. The method has the beneficial effects that the slices manufactured through the method are free of the application of any additive, and the loss of flavonoids compounds in the slices is emphasized to be prevented in the manufacturing process, so that the manufactured slices contain much more flavonoids compounds and are extremely high in quality; moreover, the manufacturing method provided by the invention is simple and quick, and can be completed without the investment of excessive labor capacity.

The invention discloses a carbon sphere-carbon nitride nanomaterial and preparation and application thereof. The spheres are loaded on the surface of the C3N4 in situ to form a composite two-dimensional layered structure, the mole ratio of the carbon spheres to the C3N4 is 0.025-0.1, and the preparation method includes the steps of 1, dissolving the C3N4 into an organic solvent, and evenly mixingto obtain a solution A; dissolving citric acid or glucose into a same organic solvent, and evenly mixing to obtain a solution B; 2, fully mixing the solution A and the solution B to form a homogeneoussolution for a hydrothermal reaction, after the hydrothermal reaction is completed, conducting centrifugation to collect precipitate, and conducting freeze drying to obtain the C3N4 material loaded with the carbon sphere in situ. The carbon sphere-carbon nitride nanomaterial is used for photocatalytic reduction of CO2.

The invention discloses a preparing method for anti-microbial hemostatic chitosan. The preparing method for the anti-microbial hemostatic chitosan comprises the steps that a cationic reagent solution is dropwise added in an epoxy reagent solution, the reaction temperature is controlled at 25-90 DEG C, reaction is conducted for 2-24h, pressure-reduction and distillation are conducted after the reaction is finished, and a quaternary ammonium reagent is obtained; the quaternary ammonium reagent is dissolved in a solvent, and a quaternary ammonium reagent solution is prepared; chitosan is added in an alkaline solution, then the quaternary ammonium reagent solution prepared in the step S1 is added and stirred for reaction, and the anti-microbial chitosan is obtained after washing and drying of raw products. The invention further discloses the application of the anti-microbialhemostatic chitosan. A chitosan anti-microbial hemostatic sponge is prepared, according to the standard of GB / T20944.3-2008, the detected bacteriostasis rate of staphylococcus aureus is greater than or equal to 98%, the bacteriostasis rate of escherichia coli is greater than or equal to 90%, and it is indicated that the prepared chitosan anti-microbial hemostatic sponge has the anti-microbial effect; the hemostatic effect of the prepared anti-microbial hemostatichemostatic sponge is excellent, and hemostatic time is less than or equal to 60 seconds; and the anti-microbial hemostatic sponge prepared by utilizing the chitosan has no obvious cytotoxicity, and biodegradation can be achieved.

Fully degradable chitosan hemostatic powder is disclosed. The hemostatic powder is chitosan, or composition of chitosan or / and other substance. The other component can be one or more of PVP, hyaluronic acid and oxidized starch. The particle diameter of the chitosan hemostatic powder is in the range of 20 micrometers to 2 millimeters. The chitosan hemostatic powder is porous microballs. The chitosan hemostatic powder is prepared with the spray drying process through chitosan or carboxymethyl chitosan solution of 5-10 g / L of mass fraction, and pH value of the solution is in the range of 4.0-7.4. The solvent used is distilled water or acetum, and the mass fraction of acetum is 10g / L. The prepared chitosan solution is subjected to spray drying, and powder is collected under the conditions that the caliber of the solution is 0.2-2 mm, inlet temperature is 160-180 DEG C, outlet temperature is 100-105 DEG C, and spray speed is 3-10 mL / min.

The invention belongs to the technical field of the sugar industry and discloses a method for separating mycose from glucose. According to the method, nano-gold is as a catalyst and the mixed liquid of mycose and glucose is as a substrate, wherein the nano-gold catalyzes glucose in the mixed liquid to generate gluconic acid; and then the gluconic acid is separated from the mycose through a chromatographic process. The glucose is catalyzed by the nano-gold to generate the gluconic acid, and the sugar-to-sugar separation applied to mycose and glucose is transformed into sugar-to-acid separation, so that the separation efficiency is greatly improved; besides, the method is simple and quick, wide in raw material source and low in cost; therefore, the method is an efficient new process for separating mycose from glucose.

The invention relates to silicon dioxide modified carbon dot fluorescent powder which is prepared from raw materials comprising citric acid, a silane coupling agent KH792 and silicon dioxide in a vacuum heating condition. The invention also provides an application of the silicon dioxide modified carbon dot fluorescent powder in preparing fluorescent silicone rubber and the fluorescent silicone rubber prepared from the silicon dioxide modified carbon dot fluorescent powder. The fluorescent silicone rubber is prepared by the following step of fully mixing and vulcanizing the raw materials of thecarbon dot fluorescent powder, the silicon rubber, silicon dioxide, hydroxyl silicone oil and DMDBH. The preparation method of the silicon dioxide modified carbon dot fluorescent powder provided by the invention is simple and rapid and green and environment-friendly. The silicon dioxide modified carbon dot fluorescent powder is applied to silicone rubber, so that the silicone rubber has an excellent fluorescent performance, and the heat stability and the ageing resistance of the silicone rubber are improved.

The invention discloses a producing method of a micromanipulation holding needle. The producing method comprises the steps as follows: (1) heating and then stretching a glass capillary tube, and breaking the glass capillary tube in a position where the outer diameter is in a range of 150-170 mu m to obtain a tube body connected with a tip part; (2) heating the tip part of the tube body to enable the inner diameter of the tip part to shrink to be in a range of 40-50 mu m; (3) horizontally placing the tube body treated in Step (2) and a heat source, placing the tube body above the heat source, and enabling the distance between the tip of the tube body and the heat source to be in a range of 2-3 mm in the horizontal direction; heating the tube body until the tip part of the tube body is bent downwards by 20-30 degrees; and then realizing production of the micromanipulation holding needle. The producing method is simple and rapid; according to the holding needle produced with the producing method, the producing cost of the micromanipulation holding needle can be effectively reduced; the outer diameter of the holding needle produced with the method is in the range of 150-170 mu m, so that an oocyte and an embryo of a pig can be fixed effectively.

The invention discloses a metallographic specimen preparation method. The metallographic specimen preparation method particularly comprises the following steps: firstly, sampling a metallographic specimen; secondly, inserting the metallographic specimen; thirdly, polishing the metallographic specimen; fourthly, carrying out acid etching and washing on a to-be-polished surface of the metallographic specimen, namely putting the to-be-polished surface into nital for etching and washing with water; and finally, polishing the metallographic specimen. The metallographic specimen preparation method is simple and rapid; abrasive material particles and metal abrasive dust particles on the polished surface are dissolved by adding the nital etching procedure before polishing; obvious polishing marks cannot be left on the polished specimen, and thus the polishing effect of the metallographic specimen is improved; the polishing time of the metallographic specimen is shorter than before, and the polishing efficiency is improved.