54results about How to "Good repeatability of experiment" patented technology

The invention relates to the technical field of nonmetallic mineral finish machining and inorganic processing, in particular to an attapulgite/graphite phase carbon nitride composite material. The attapulgite/graphite phase carbon nitride composite material takes attapulgite as a carrier and takes graphite phase carbon nitride as an active ingredient; the mass ratio of the attapulgite to the graphite phase carbon nitride is 1: 1 to 1: 10. By compounding the graphite phase carbon nitride with the attapulgite, the foreign ions in the attapulgite enter the crystal lattices of the graphite phase carbon nitride to increase the defects and change the energy level; the silicon oxide in the attapulgite can possibly form a heterojunction structure with the graphite phase carbon nitride so as to promote the transfer of photo-generated electrons and avoid the self-compounding of the photo-generated electrons; through the concerted catalysis action between the carrier and the active ingredient, the catalytic activity of the composite material is strengthened to a great extent.

The invention relates to a method for preparing a ceria/monox compounded abrasive, and application of the compounded abrasive. The method uses monodisperse spherical monox as a kernel of a coating type compounded abrasive, hexamethylenetetramine (HMT) as a precipitator and cerium salt as a raw material, and adopts an even precipitation method process to synthesize the ceria/monox compounded abrasive. Through the optimization of process parameters, such as the use amount ratio of monox master particles to the cerium salt, the molar ratio of the HMT to the cerium salt, and reaction and calcination temperature, the method controls the covering amount, the shape and the distribution state of ceria particles on the surface of the monox, thereby preparing the ceria/monox compounded abrasive of which the nanometer-level ceria particles evenly cover on the surface of the monox and which has good monodispersity; the method does not need complex equipment; and the needed chemical materials have less varieties, cheap prices and good experiment repeatability. The ceria/monox compounded abrasive is prepared into polishing slurry for chemical mechanical polishing of a gallium arsenide chip so as to obtain the polishing surface with the roughness in sub-nanometer magnitude and further improve polishing speed, reduce polishing pass and improve efficiency.

The invention provides a method for preparing fluorinated graphene through a microwave hydrothermal method. The fluorinated graphene is prepared by employing the microwave hydrothermal method and is rapidly heated by utilizing the change of the electric field and magnetic field in the space, the low-temperature (150-200 DEG C) temperature is realized, the reaction time (30-60 minutes) is greatly shortened, the energy consumption is reduced, and the preparation efficiency is improved. The adopted preparation method does not have temperature gradient in the reaction process, a hysteresis effect is avoided, and the reaction process is easy to control and fewer in influence factors; and the prepared fluorinated graphene is uniform in fluorine doping and high in experimental repeatability. The process conditions such as raw material ratio, reaction temperature and reaction time are adjusted, and the fluorinated graphene of different fluorine contents can be prepared. The prepared fluorinated graphene is high in yield, and the yield is up to 90-95 percent. The preparation method is easily popularized and applied.

The present invention provides a fine finishing of nonmetalic mineral resource and inorganic chemical industry field, characterized in that natural attapulgite clay is produced to sizing agent which solid content is about 10% after being pretreated by hydrochloric acid, a certain quality attapulgite clay and cerous salt are mixed to dissolve in the de-ionized water, the solution is evenly blended by electric mixer, wherein Ce3+ relative to the concentration range of solution is 0.001mol/l-0.5mol/l, the concentration range of the attapulgite clay is 2-50g/l; further adding a certain quality HMT, and mixing evenly, mol ratio of HMT and cerous salt is between 2:1-20:1; the blended solution is placed in the 70-100 Celsius water bath to react 1-5h under the mixing of the electric mixer, removing and cooling to the room temperature, calcining 1-5h under the temperature 200-700 Celsius after filtering, washing and drying, attapulgite powder loading nanometer cerium oxide is obtained. The attapulgite powder of the invention has a homogeneous load, better dispersivity, has no complex equipment, and less chemical material sorts, lower cost and better experiment repeatability.

The invention relates to methods for testing foam properties. The methods include an antifoaming property testing method and a defoaming property testing method. The two testing methods comprise the following steps: (1) adding 800-1200ml of liquid to be tested to a transparent test tube with inner diameter of 20-100mm and capacity of 2200-3500ml in advance; (2) vertically injecting the liquid to be tested downwards at a flow rate of 2-12L/min at the height 30-80cm distant from the level of the liquid in the step (1) to generate foams and at the same time, the liquid to be tested flowing out from the bottom of the test tube at the same rate; and taking the amount of the generated foams and the generation time of the foams as well as the subsequent defoaming time as the corresponding parameters. The invention also relates to a device for testing foam properties. The methods and the device have the following beneficial effects: various errors generated by manual operation can be avoided; and the methods and the device not only are suitable for evaluating the defoaming effects of the defoamers for working fluid under various temperature but also can be used for evaluating the antifoaming effects of various systems to which the defoamers are not added and the inspection methods of the defoaming properties of other water-based products (such as washing agents and the like).

The invention provides a TiAl based alloy metallographic specimen corroding method. The method comprises the following steps: kibbling and polishing a TiAl based alloy specimen on silicon carbide paper, and then carrying out electrolytic corrosion, wherein the metallographic specimen to be observed is utilized as an anode, a stainless steel sheet is utilized as a cathode, an electrolytic corrosion solution is utilized as a conducting medium, the electrolytic corrosion voltage is 15-18V, and the electrolytic corrosion time is 30-240s; then washing clean and blow-drying; and observing a clear TiAl based alloy microscopic structure under an ordinary light microscope bright field image condition. The method provided by the invention has the advantages of solving the problem of difficulty in display of the TiAl based alloy metallurgical structure, enabling the to-be-observed surface of the specimen to form megascopic color, integrally and clearly displaying TiAl based alloy structures in different states, obtaining clear and beautiful images by virtue of observation under an ordinary optical metalloscope, enabling grain boundaries in the alloy to be clear and visible and integrally displaying the internal structure characteristics of grains. The method is simple and convenient to implement and does not need special equipment. Compared with other chemical metallographical corroding methods, the method provided by the invention has the advantages of easily controlled conditions, simplicity in operation and good experiment repeatability.

The invention discloses a method using hypha as a template for preparation of a graphene tube with a controllable aperture, the method comprises the following steps: (1) preparing a liquid culture medium; (2) inoculating fungus and observing; (3) separating hypha; (4) performing heat treatment on the obtained hypha, to be more specific, putting the hypha obtained by the step (3) into a crucible, placing in a tube furnace, leading in nitrogen for protection, heating to 500-800 DEG C, keeping warm for 2 hours and automatically cooling; (5) after calcination, taking a prepared grapheme tube out for cooling. The grapheme tube material is prepared by a relatively simple chemical process, needed chemical raw materials are less and non-toxic, no complex equipment is needed, the cost is low, a biological template is easy to remove and free of pollution to the environment, the experimental repeatability is good, and the method has great industrial popularization value.

The invention discloses a hydrothermal synthesis method for a nitrogen-doping graphene-loaded cobalt oxygen reduction reaction electrocatalyst. The hydrothermal synthesis method comprises the steps of fully mixing and placing GO (graphene oxide) and urea in a baking oven for nitrogen-doping thermal treatment; smashing and adding the nitrogen-doping GO into deionized water for ultrasound dispersion for 0.5 hour, transferring the obtained product to a hydrothermal reaction kettle, performing magnetic stirring for 20 minutes, adding a cobalt salt, continuing to stir for 10 minutes, and sealing the reaction kettle for hydrothermal reaction; and adding hydrazine hydrate after the hydrothermal reaction is completed, adjusting pH of a solution to be 10 with concentrated ammonia water, sealing the reaction kettle, and continuing hydrothermal reduction reaction to obtain a nitrogen-doping graphene-loaded cobalt composite material. The nitrogen-doping graphene-loaded cobalt composite material prepared according to the method is used as the oxygen reduction reaction electrocatalyst, a cyclic voltammetry reduction peak potential in 0.1M of KOH solution is -0.18V (vs.Ag/AgCl), and an initial potential is -0.1V (vs.Ag/AgCl).

A device for preparing double-shell microcapsules comprises a core material liquid inlet, a wall material liquid inlet, a vibrating system, a concentric nozzle, a collector, a stirrer, a peristaltic pump I, a second layer coating chamber, a rotatable screen, a coating liquid inlet, a peristaltic pump II, an atomizing nozzle, an air compressor, a temperature control system and the like. The deviceis simple; through control over the liquid inlet speeds of the core material liquid inlet and the wall material liquid inlet and the vibrating frequency of the vibrating system, the sizes of microcapsule cores are controlled, so that the microcapsules with uniform sizes are prepared and damage during microcapsule preparation is reduced; through hardening liquid filtration and hot air fluidization,rapid moulding of first-layer microcapsules is achieved; through control over the atomizing pressure and the coating liquid solubility, the shell thickness of second-layer coating is controlled. A preparation technology is simple, the reaction condition is mild, the control is easy, and the repeatability is relatively good; in addition, because of a sealing property of the device, influence of the environment on the microcapsules is greatly reduced, so that the double-shell microcapsules can be effectively prepared and the preparation time is greatly shortened.

The invention belongs to the technical field of chemical catalysis, and particularly relates to a preparation method of a high-activity electrochemical oxygen reduction catalyst. The preparation method comprises the following steps: ultrasonically stirring and dissolving a phthalocyanine material in an organic solvent, loading the phthalocyanine material on a specially treated conductive materialin an organic matter leaching manner, filtering, and cleaning to obtain the high-activity electrochemical oxygen reduction catalyst. According to the invention, the preparation method of the high-activity electrochemical oxygen reduction catalyst is developed, and the obtained electrochemical oxygen reduction catalyst has excellent electrochemical performance; the method is low in raw material cost, simple in reaction process, low in experimental operation difficulty, good in experimental repeatability and free of additives difficult to remove; and the prepared high-activity electrochemical oxygen reduction catalyst has high electrochemical oxygen reduction efficiency and good electrochemical stability, and can achieve the half-wave potential of 0.9 V compared with the traditional commercial Pt/C (0.86 V) under the same condition.

The invention discloses a method for efficiently producing chlorinated graphene. The method comprises the following steps that graphene powder is heated, so that a part of moisture is removed, vacuumizing is conducted until moisture of the graphene powder is completely removed, and the graphene powder continues to be heated; the graphene powder and chlorine react at a certain temperature, and a chlorinated graphene powder material is obtained; the chlorinated graphene powder material is treated with nitrogen, free chlorine adsorbed on the surface of the chlorinated graphene powder is removed, and pure chlorinated graphene powder is obtained. Negative electricity exists among the chlorinated graphene powder prepared according to the method due to the action of a chlorine functional group, and the chlorinated graphene powder is fluffier and easier to scatter in use due to the action that like charges repel; in addition, the number of steps of the preparation method is small, the productivity is high, the technology is simple, and large-scale industrial production is easy to achieve.

The invention relates to a preparation method of olivary porous stannic oxide sensitive to hydrogen sulfide. The preparation method comprises the steps of respectively dissolving 0.4g of surface active agent polyvinylpyrrolidone (k=30) and 0.8g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (PEO-PPO-PEO) in a solvent prepared by 60ml of deionized water and ethanol solution in a volume ratio of 1:3; dissolving stannous chloride dihydrate and oxalic acid dihydrate in a molar ratio of 1: 10 to 1: 30 in a settled solution of (1); pouring the solution into a 100ml hydrothermal reaction kettle to have hydrothermal reaction at the temperature of 180 DEG C for 12 hours; centrifugally separating, washing and annealing a reaction product to obtain olivary porous stannic oxide nano particles sensitive to hydrogen sulfide. The prepared stannic oxide nano particles are good in selectivity and response property to toxic and harmful gas, namely hydrogen sulfide. The olivary porous stannic oxide has characteristics of simple and easy preparation method, good product performance and the like, so that the stannic oxide nano particles have good application prospects in the field of a gas-sensitive sensor.

The invention discloses a preparation method of a two-dimensional porous Co3O4-ZnO composite nanosheet. The method comprises the following steps: (1) collecting plant petals and pretreating the petalsto obtain a petal template; (2) dipping the template; and (3) taking out the dipped template, cleaning, soaking and drying the template, calcining the template by a muffle furnace and then naturallycooling the template to obtain the two-dimensional porous Co3O4-ZnO composite nanosheet. The preparation method of the two-dimensional porous Co3O4-ZnO composite nanosheet is simple, sources of raw materials are wide, the cost is low, the method is green and pollution-free, the prepared material has a unique two-dimensional porous structure, high catalytic activity and heat stability, and when thematerials is used for purifying organic dyestuff wastewater, the organic dyestuff wastewater can be decomposed catalytically.

The invention relates to a preparation method of an ATP (attapulgite)/ Ce-Ti (cerium-titanium ) sold soluble oxide composite material, and belongs to the technical field of finish machining of nonmetallic minerals and the inorganic chemical industry. The preparation method of the ATP/Ce-Ti sold soluble oxide composite material comprises the steps that a proper amount of cerium salt and titanium alkoxide at a molar ratio of 9:1 to 3:7 are solved in anhydrous ethanol and evenly mixed with the anhydrous ethanol to serve as a component A; a proper amount of ethanol, deionized water and glacial acetic acid are additionally taken and mixed to serve a component B; the component B is dropwise added to the component A under a continuous stirring condition, the pH (potential of hydrogen) value A is regulate to 2 to 4 by using nitric acid, and the ATP is added to an obtained solution and continuously stirred for 24 hours; and an obtained mixture is placed in a thermostat to be aged for several days to form xerogel, and after the xerogel is calcined, the ATP/Ce-Ti sold soluble oxide composite material is obtained. The method is simple to operate, requires a low cost and facilitates the realization of large-scale industrial production; and prepared ATP/CeO2-TiO2 is evenly loaded, has good dispersity and has very high industrial application value.

The invention provides a synthesis method and application of a nanometer silver/silicon dioxide Raman surface enhanced thin film. The thin film is prepared from the following steps of: taking PVP (polyvinyl pyrrolidone) to dissolve into ethanol; performing magnetic stirring for 2 hours; slowly dripping tetraethoxysilane; performing stirring for 4 hours to obtain a solution A; then, taking and dissolving silver nitrate into water; then, slowly dripping the silver nitrate into the solution A to be stirred; then, performing static spinning at the temperature being 18 to 22 DEG C and the humidity being 50 percent to 60 percent; preparing spinning liquid into a thin film material on a receiving plate; performing illumination by a fluorescent lamp; standing for 6 hours; taking down the thin film; putting the thin film into a vacuum drying box to be dried for 24 hours at the temperature being 25 to 30 DEG C; then, performing calcinations for 3 to 5 hours; performing natural cooling; thereby obtaining the nanometer silver/silicon dioxide Raman surface enhanced thin film. The material can be used as a Raman enhanced material with the advantages of high stability, high repeatability, high universality, high activity and simple and cheap preparation method; good application prospects are realized in the aspect of antibiotic pollution monitoring.

The invention discloses a nitrogen-doped graphene/cobaltous oxide composite material. Graphite oxide, a cobaltous acetate solution and ammonium carbonate are taken as the main raw materials, and cobaltous oxide is loaded on nitrogen-doped graphene by adopting a water bath-hydrothermal-calcining method to obtain the nitrogen-doped graphene/cobaltous oxide composite material. Compounding of nitrogen-doped graphene and cobaltous oxide is proposed initially in the invention, the obtained composite material is high in cobaltous oxide purity, and a synergistic effect between cobaltous oxide and nitrogen-doped graphene can be achieved, so that an excellent catalytic ability on a fuel cell negative electrode oxygen reduction reaction can be achieved; meanwhile, the material cost of a catalyst is greatly lowered; and the involved preparation method is simple, high in repeatability and suitable for popularization and application.

The invention discloses a method for preparing a novel genome simplified methylation sequencing library. The method comprises the following steps: respectively performing enzyme digestion on genome DNA by using two dual enzyme digestion combinations of EcoRI/MspI and EcoRI/HapII, and purifying fragments after enzyme digestion; designing a specific connection primer for connecting the purified DNA fragments; dividing the connected products into two groups, and mixing into two tanks; purifying mixing tank samples and recycling fragments of 300-400bp through agarose gel electrophoresis; and performing PCR enrichment and agarose gel electrophoresis recycling on the recycled fragments, thereby obtaining the sequencing library. The method has the advantages of high cover rate, low redundancy, high sensitivity, large-scale sample, high cost performance ratio, high result reliability, good experiment repeatability, and the like, and is generally applicable to various genome methylation difference studies in ordinary molecular biological laboratories.

The invention discloses a method used for automatically extracting a target cell mitochondrion and belongs to micro nano robot assisted control systems, and automatic cell pose control and two-dimensional cell biopsy operation are realized. The method comprises the steps that a CCD camera connected with a fluorescence microscope is used for collecting a cell image, and the position and the pose angle of the to-be-extracted target cell mitochondrion are recognized with an image processing algorithm; accurate control of the cell position and the pose angle is realized respectively through different operation modes of optical tweezers; a pump is externally connected to a micro-fluidic chip to add negative pressure, so that the target cell is firmly fixed in the passage of the micro-fluidic chip to keep the pose; the sharp end of a glass micro pipe moves to the nearby of the to-be-extracted target cell mitochondrion with a visual feedback control strategy; a target cell is extracted from the to-be-extracted target cell mitochondrion through the negative pressure applied by the pump externally connected to the glass micro pipe.

The invention relates to a preparation method of a ferrous sulfide/attapulgite composite and belongs to the field of utilization of nonmetal mineral materials. The preparation method comprises the steps as follows: a certain amount of ferric nitrate, thioacetamide and attapulgite are weighed and added to deionized water for ultrasonic treatment and stirring, a mixed liquid is transferred to a reaction kettle to react at the temperature of 160-220 DEG C, water washing and alcohol washing are performed after the reaction, drying is performed, and the ferrous sulfide/attapulgite composite can beobtained. The prepared ferrous sulfide/attapulgite composite is uniform in loading and good in dispersity, experimental raw materials are easy to obtain, no complicated equipment is required, and theferrous sulfide/attapulgite composite has a good low-temperature conversion effect on nitrogen oxide under the assistance of light.

The invention discloses a method for preparing a tubular ZnO-SnO2 composite nano material based on a bean sprout template method. The method comprises the following steps: (1) purchasing fresh bean sprouts, and pretreating the fresh bean sprouts to form a bean sprout template; (2) dipping the template; and (3) taking out the impregnated template, cleaning, soaking and drying the template, calciningthe template in a muffle furnace, and naturally cooling the template to obtain the tubular ZnO-SnO2 composite nano material. The method for preparing the tubular ZnO-SnO2 composite nanomaterial is simple, the raw materials are wide in source, low in cost, green and free of pollution, and the prepared material has high catalytic activity and thermal stability; when the material is applied to purification treatment of organic dye wastewater, the organic dye wastewater can be effectively catalytically degraded.