697results about How to "Good repeatability" patented technology

A reaction-based process has been developed for the selective removal of carbon dioxide (CO₂) from a multicomponent gas mixture to provide a gaseous stream depleted in CO₂ compared to the inlet CO₂ concentration in the stream. The proposed process effects the separation of CO₂ from a mixture of gases (such as flue gas/fuel gas) by its reaction with metal oxides (such as calcium oxide). The Calcium based Reaction Separation for CO₂ (CaRS—CO₂) process consists of contacting a CO₂ laden gas with calcium oxide (CaO) in a reactor such that CaO captures the CO₂ by the formation of calcium carbonate (CaCO₃). Once “spent”, CaCO₃ is regenerated by its calcination leading to the formation of fresh CaO sorbent and the evolution of a concentrated stream of CO₂. The “regenerated” CaO is then recycled for the further capture of more CO₂. This carbonation-calcination cycle forms the basis of the CaRS—CO₂ process. This process also identifies the application of a mesoporous CaCO₃ structure, developed by a process detailed elsewhere, that attains >90% conversion over multiple carbonation and calcination cycles. Lastly, thermal regeneration (calcination) under vacuum provided a better sorbent structure that maintained reproducible reactivity levels over multiple cycles.

The invention provides a carbon nanofiber aerogel as well as a preparation method and the application of the carbon nanofiber aerogel. The method comprises the following steps: a), obtaining neutral bacterial cellulose blocks by soaking bacterial cellulose blocks into deionized water for deacidification; b), using liquid nitrogen to refrigerate the neutral bacterial cellulose blocks and drying in a freeze dryer to obtain a bacterial cellulose aerogel; and c), warming the bacterial cellulose aerogel and performing high-temperature pyrolysis to obtain the carbon nanofiber aerogel. The preparation method for the carbon nanofiber aerogel, provided by the invention, is simple, feasible and good in repeatability, and the raw material is cheap and easy to obtain, so that large-scale preparation can be realized easily; the carbon nanofiber aerogel prepared by the invention has good lipophilicity and facilitates adsorbing raw oil and chemical reagent during raw oil pollution and chemical reagent leakage; and in addition, as the carbon nanofiber aerogel has electrical conductivity and elasticity, the carbon nanofiber aerogel can be further used for preparing a pressure sensor.

The invention relates to a method for automatically measuring human body dimensions on the basis of three-dimensional point cloud data. According to three-dimensional human body point cloud data acquired by a laser three-dimensional color human body scanner developed on the basis of independent innovation, the original three-dimensional point cloud data is denoised and the like; and then human body dimensions, which are required by costume design, model measurement and the like and comprise height, body measurements and curve length, are acquired by automatically fetching human body characteristic points and characteristic sections. A measuring system adopted by the invention acquires three-dimensional human body outline data, which can reflect the body form of the human body best, by directly scanning the human body; joint points and outline convex points of the human body can be automatically fetched by a maximum and minimum measurement method and a most convex and concave point method; and characteristics and dimensions of the human body longitudinal sections and cross sections can be directly acquired. The method is convenient in operation, high in speed, high in measuring precision, high in repeatability and suitable for human body measurement on a large scale.

A two-mode nanometer fluorescence labelling material based on a rare earth doped sodium gadolinium fluoride core-shell structure and a preparation method thereof relate to a two-mode nanometer fluorescence labelling material with the rare earth doped sodium gadolinium fluoride core-shell structure, in particular to a method which can be used to ensure that the rare earth doped sodium gadolinium fluoride nanometer crystal can have up-conversion and down-conversion luminous modes. The preparation method is as follows: up-conversion ions and down-conversion rare earth ions are doped in the core and shell layers of the sodium gadolinium fluoride nanometer crystal respectively to obtain the two-mode nanometer fluorescence labelling material with the sodium gadolinium fluoride core-shell structure, wherein the material has monodispersity and integrates up-conversion luminescence and down-conversion luminescence. The prepared nanometer fluorescence labelling material with the sodium gadolinium fluoride core-shell structure is xRE<3+>-(1-x)NaGdF4 (RE = Ce, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm or Yb and x is 0-50mol%). A spectrometer is used to measure the luminescence of a sample; and by exciting Gd<3+> and Yb<3+>, the up-conversion luminescence and down-conversion luminescence of rare earth ions can be realized respectively.

This invention relates to an electromagnetic progressive shaping method for plate moving coils and a device, in which, said device includes a computer control system, an electromagnetic force generation system and a three-shaft digital control shaping system including a plate clamping elevating device, a supporting model frame and an electromagnetic shaping clamping rod, in which, the computer controls the coil to move downward along the contour of a model profile from the top according to the contour data of the model profile and the plate is formed partly relying on the magnetic force of coil till to the bottom of the model and finish the entire process.

The invention discloses a method for synthesizing a Li4Mn5O12 sub-micrometer rod, belonging to the technical field of synthesis of active material of a lithium ion battery. The method includes the following steps: firstly, synthesizing a MnOOH sub-micrometer rod through hydrothemal method and secondly preparing Li4Mn5O12 through solid phase technique, wherein the MnOOH sub-micrometer rod is synthesized by taking MnSO4.H2O, KMnO4 and CTAB as raw materials through the steps of keeping the materials warm for 12h-30h under 140 DEG C to 180 DEG C, washing through alcohol and deionized water, and drying; and the Li4Mn5O12 is prepared by taking MnOOH and LiOH.H2O as raw materials through the step of keeping the materials warm for 10h-24h under 500 DEG C-900 DEG C. The method has the advantages of easy implementation, good repeatability and low material cost, and the product of Li4Mn5O12 is of one-dimensional structure which facilitates the transfer of the Li +/charges in the one-dimensional direction when the Li4Mn5O12 sub-micrometer rod is applied on the lithium ion battery and is good for improving the performance of the lithium ion battery.

The invention discloses an organosilicon modified silica sol/polyacrylate composite emulsion and its preparation method. The emulsion comprises the following raw materials, by mass, 30-55 parts of deionized water, 20-65 parts of a modified silica sol, 2-15 parts of a core acrylate monomer, 20-60 parts of a shell acrylate monomer, 0.1-3.0 parts of organosilicon, 0.1-2.5 parts of an emulsifier, 0.02-1.5 parts of an initiator, and 0.01-2.0 parts of sodium bicarbonate, wherein the Si (by SiO2) content in the organosilicon modified silica sol/polyacrylate composite emulsion is 15-25% by mass. The emulsion which has an excellent appearance is a white emulsion with obvious blue lights. A coat of the emulsion is transparent and smooth, and has a hardness reaching 5-6H and an adhesion being 0-1 level. The coat has an excellent water resistance, so the coat does not have whitening and foaming phenomena after immersed in water for 7-10 days; the coat has no changes after resisting neutral salt fog for 15-20 days; and the solvent wiping resistance of the coat can pass an MEK test 180-200 times.

The invention discloses composite conductor application of carbon nano tube fiber and a preparation method thereof. The invention is characterized in that a high strength carbon nano tube fiber material is combined with electroplating or chemical plating surface treatment process, and conductive metal coating is compounded on the carbon nano tube fiber, thus obtaining a carbon nano tube composite conductor with light weight, high strength and high electric conduction. The preparation method includes the following steps: firstly high strength carbon nano tube fiber material is prepared, and then chemical plating or electroplating is adopted to prepare uniform metal coating on the surface of fiber, thus obtaining the carbon nano tube composite conductor. The type of metal coating and the thickness of metal coating are controlled, so that the conductivity of carbon nano tube conductor can be consistent with the conductivity of metal body. The application and preparation method of the invention are simple and feasible, step is simple, and repeatability is good, thus being applicable to mass production, thereby having significance in development of novel superfine conductor with light weight, high tenacity and high strength and in showing potential application value thereof in electronic industry.

A portable air temperature controlling device useful for warming air surrounding an aerosolized drug formulation. Warming the air of an aerosol makes it possible to reduce the diameter of aerosol particles produced by an aerosol generation device. Additionally, warming the air forces the diameter of the aerosol particles to be in the range required for systemic drug delivery independent of ambient conditions. Smaller particles can be more precisely targeted to different areas of the respiratory tract.

The invention discloses a detection kit for a novel coronavirus, influenzas A and B and a respiratory syncytial virus. According to the detection kit, through combining primer probe design and adaptive detection system optimizing research, a group of nucleic acid combined detection primer and probe combinations and nucleic acid combined detection kits for the novel coronavirus (2019-nCoV/SARS-CoV2), an influenza A virus (FluA), an influenza B virus (FluB) and the respiratory syncytial virus (RSV) are developed, and sequences of primers and probes are shown in SEQ ID NO: 1-18. The kit has theadvantages of high detection sensitivity, good repeatability and low false negative and false positive and can effectively distinguish novel coronavirus infection from ordinary viral influenza and respiratory syncytial virus induced respiratory tract infection, so that precise diagnosis and subsequent precise treatment on a sufferer are achieved.

The invention relates to a method for growing single-layer molybdenum disulfide by chemical vapor deposition. The method comprises the steps of growing a substrate, pre-treating implanted seeds, pre-treating a precursor, carrying out ready growth, growing to obtain single-layer molybdenum disulfide monocrystal and a continuous molybdenum disulfide single-layer film, and the like. The single-layer molybdenum disulfide prepared by the method has the characteristics of high sample quality, large area, good reproducibility and the like.

The invention discloses a graphene oxide/polystyrene nano composite and a preparation method thereof. The preparation method includes preparing a graphene oxide nanosheet; using graphene oxide as a solid surfactant to obtain stable Pickering emulsion under actions of coordination and stabilization of salt; and polymerizing the in-situ emulsion to obtain the graphene oxide/polystyrene nano composite. The specific steps of the preparation method include oxidizing natural flake graphite by oxidants to obtain graphite oxide, carrying out ultrasonic exfoliation and centrifugal separation to obtain graphene oxide, adding the graphene oxide into salt solution and stirring the mixed solution to form a uniform dispersed system containing the graphene oxide and salt; and adding styrene into the dispersed system, carrying out ultrasonic treatment to obtain the stable Pickering emulsion, adding initiators into the Pickering emulsion, stirring and polymerizing to obtain the graphene oxide/polystyrene nano composite. The preparation method is good in repeatability, has the advantages of mild reaction conditions, low energy consumption and easiness in operation and brings convenience for industrialized implementation.

The invention discloses a method for manufacturing a porous pyramid-type silicon surface light trapping structure for a solar cell and belongs to the technical field of solar cell. The method comprises the following steps of: after cleaning a silicon wafer, manufacturing a pyramid structure surface by using an alkali etching technology; and manufacturing the porous pyramid-type surface light trapping structure by combining a noble metal nanoparticle catalyzing and etching process. The average reflectivity of a porous pyramid-type silicon surface light trapping structure manufactured by the method within a spectral range of 300 to 1000nm is reduced to 3.3 percent, so that a new technical measure is provided for improving the efficiency of a silicon solar cell; and when the method is used, the conventional alkali etching process and the noble metal nanoparticle assistant etching process are comprehensively utilized, the characteristics of a wet etching method are kept, and a higher anti-reflective effect of the silicon surface is achieved.

The invention discloses a water-soluble carbon quantum dot and a preparation method thereof. The preparation method of the water-soluble carbon quantum dot comprises the following steps of: sealing a mixed solution to a hydrothermal kettle for carrying out hydrothermal reaction by using aldehyde group-containing saccharide carbohydrate as a carbon source and using noble metal salts as an oxidant and catalyst; centrifuging and separating the obtained product to obtain an aqueous solution of the carbon quantum dot; separating the aqueous solution through an ultra-filtration centrifugal tube or an ultra-filtration membrane, collecting the filtered solution, drying the filtered solution under vacuum to obtain the carbon quantum point. The carbon quantum dot prepared by the preparation method disclosed by the invention can stably exist in the aqueous solution for a long time, is uniform in dimension distribution, high in fluorescence intensity and adjustable in light-emitting wavelength with the laser wavelength. Meanwhile, the surface of the carbon quantum dot is rich in carboxyl and hydroxyl, easy to realize surface functionalization and capable of being extensively applied to the fields including the biological field, the chemical field, the material field and the like. The preparation method disclosed by the invention is simple, good in repeatability, easily available in materials, short in preparation period, low in cost and easy for popularization.

The present invention provides a ceramic heater having better anti thermal shock property. A ceramic substrate 12 is formed by providing heat generation bodies 14a and 14b on the surface of a green sheet made from a slurry containing powdered ceramics, sandwiching the green sheet with other green sheets from both upper and lower sides and then laminating and pressing the compiled green sheets. At least some of the heat generation bodies 14a and 14b are disposed on a level P1b offset from a level P1a of other heat generation bodies in the direction of thickness of the ceramic substrate 12.

The invention discloses a method for preparing slab-shaped complex film made by blending polyethersulfone. Various film-forming agents according to certain proportion are made by blending polymer (polyethersulfone and sulfonated polyethersulfone), additive, non-solvent and organic solvent. Complex film is prepared on traditional shearing machine via pouring film-forming agents into loading chute, entering knife-edge groove, covering solution on supporting layer and dipping it into coagulating bath. The invention is characterized in that mainly via adjusting composition of film-forming agents, it prepares slab-shaped complex film with high intensity, high water flux and good hydrophilicity.

The invention discloses a method for preparing a super-hydrophobic nano-magnetic thin film. The method comprises the following steps of: preparing nano iron oxide-silica core-shell particles; adding the nano iron oxide-silica core-shell particles into an alcohol solution, and adding a silane coupling agent and a catalyst to obtain nano iron oxide-silica core-shell particles of which the surfaces are modified by ethylene; and dispersing the surface modified nano iron oxide-silica core-shell particles in a benzene organic solvent, adding an initiator and styrene to obtain a nano iron oxide-silica-polystyrene composite material, dispersing the nano iron oxide-silica-polystyrene composite material through ultrasonic waves, and preparing the super-hydrophobic nano-magnetic thin film by using acasting method or a pulling method. The method has the advantages of simple preparation process and low cost, and can be applied to the fields such as magnetic recording, magnetic separation, biomedicines, environmental protection, military and the like.

The invention relates to a catalyst for preparation of ethanol through acetic acid hydrogenation and a preparation method thereof, and provides a catalyst for preparation of ethanol through acetic acid hydrogenation, which is environment-friendly, mild in conditions, excellent in catalysis performance and high in stability, and a preparation method thereof. The catalyst comprises the following components in percentage by mass: 0.5-2% of platinum, 0.5-6% of tin and the balance of carrier; and the composition of the catalyst is expressed as x%Pt-y%Sn/carrier, wherein x% represents the mass percent of Pt in the catalyst, y% represents the mass percent of Sn in the catalyst, and the carrier is silicon carbide or carbon nanotube. The preparation method of the catalyst comprises the following steps: mixing surfactant sodium lauryl sulfate with the platinum and tin components; then adding the carrier; performing liquid-phase reduction to prepare a catalyst precursor; and roasting the catalyst precursor under the air atmosphere to obtain the supported platinum-tin bimetallic catalyst for acetic acid hydrogenation. The invention has the advantages of simple preparation process and good repetitiveness, and is easy to implement scale-up production.

The invention relates to a serum-free culture system for efficiently culturing human umbilical cord mesenchymal stem cells in vitro. The serum-free culture system comprises the following components: a basal culture medium a-MEM, cell factors, hormones and proteins, unsaturated fatty acids, antioxidants, energy substances, an amino acid additive, vitamins and metal additives. The serum-free culture system comprises simple and clear components, is free from harms of pathogens, does not have difference between batches, has good repeatability, can obtain plenty of high-quality human umbilical cord mesenchymal stem cells in a short time and has high passage stability, so that the serum-free culture system can be applied to scientific researches and can provide high-purity vibrant cells for cell therapy as a mating system in cell therapy.

The invention discloses a slice production method for treating tobacco waste extract by using membrane separation technology, and belongs to the technical field of tobacco slice production by a papermaking method. The method is carried out by the following steps in turn: (1) extracting, (2) separating, (3) removing impurities, namely removing the impurities in the tobacco waste extract through a membrane separation device, (4) concentrating, namely concentrating the obtained ultra-filtrate after impurity removal through a nano-filtration membrane separation device, (5) coating, and (6) drying. The method has the main advantages that the separation process is easy to control, has good repeatability, and is suitable for industrialized production conditions. By adopting a nano-filtration membrane to remove the impurities, macromolecular substances such as protein, pectin and the like in an extract system can be effectively intercepted. Substances influencing the sensory quality of the tobacco slice in the obtained ultra-filtrate basically do not exist. Small molecular substances such as amino acid, monosaccharide, nicotine and the like in the system are kept, and the substances can improve the quality of the tobacco slice.

The invention provides a front end assembly method suitable for a mobile phone. The front end assembly method comprises a resource folder used for defining an assembly, wherein the folder comprises pattern information of the assembly, layout information, a main logic method and a resource file; in a configuration file, the required assembly is registered; the assembly is identified according to the configuration information and a label in a page; label rendering and addition are carried out by calling a related method in the assembly; a user is allowed to define own assembly and adds the assembly into an assembly package, and the user-defined assembly can be a brand new assembly which is developed by the user, and can also be obtained by amending and processing an old assembly; after the assembly is normally produced, an interface and an event are externally provided and interaction with external resources is realized. Since assemblies are increased, application items are increased, and the reuse frequencies of the assemblies are also increased; when the technology is adopted in the development process, the development cost is gradually reduced, and the development efficiency is gradually increased.

A preparation method for a silicon carbide ceramic pipe includes preparation of plasticity pug, vacuum pug milling of the plasticity pug, extrusion molding and shape keeping of pipe blank bodies, shade drying and drying of the pipe blank bodies and pressureless sintering. The plasticity pug is formed by adding deionized water into silicon carbide powder, sintering auxiliaries, adhesive, plasticizer, dispersing agent and lubricant and ball-milling and mixing the deionized water, the silicon carbide powder, the sintering auxiliaries, the adhesive, the plasticizer, the dispersing agent and the lubricant. The silicon carbide ceramic pipe prepared in the preparation method has the advantages of being highly-compact, super-thin in walls and high in precision and is applicable to industrial heat exchangers.

The invention provides a preparation method of reconstituted tobacco. The preparation method comprises the following steps of: 1, uniformly mixing tobacco stems, tobacco powder and water, then adding a cell disruption enzyme and an assistant I for carrying out enzymatic hydrolysis; 2, heating and extracting a mixture in the step 1, carrying out enzyme deactivation, then filtering to obtain filtrate and filter residue, concentrating the filtrate to obtain a concentrated solution; 3, adding a mixed culture and an assistant II in the concentrated solution, carrying out fermentation and enzymatic hydrolysis to obtain a tobacco extraction solution; 4, adding slurry in the filter residue in the step 1, uniformly mixing, adding hydrogen peroxide for carrying out oxygenolysis, then adding catalase for hydrolyzing residual peroxide to obtain mixed slurry; and 5, preparing the mixed slurry into a slice paper base, coating the tobacco extraction solution on the slice paper base, drying and preparing into the reconstituted tobacco. According to the preparation method of the reconstituted tobacco, the mixed culture is fermented in the concentrated solution, and thus the content of lignin can be reduced, and the smoking effect is improved.

The invention discloses a reciprocating type shaft seal sealing performance testing method and device. The device comprises a test bed frame, an outer cylinder, a sealing ring mounting loop for mounting of a sealing ring, a sealing main shaft, a pulling-pressing sensor, a supporting block, a reciprocating straight line moving device, an auxiliary device and a detecting device. The outer cylinder is fixedly arranged on the test bed frame through a support. The detecting device and the auxiliary device are connected with holes formed in the outer cylinder respectively. The sealing ring mounting loop is arranged in the outer cylinder. The two ends of the outer cylinder tightly press and seal the sealing ring mounting loop through end covers. The sealing main shaft is arranged in the outer cylinder and is connected with the pulling-pressing sensor through a coupler. The pulling-pressing sensor is connected with the supporting block which is connected with the reciprocating straight line moving device. The reciprocating straight line moving device, the pulling-pressing sensor and the auxiliary device are electrically connected with a data collecting control system.

The invention relates to a composite microbial inoculum used in a biogas generating pit, which consists of four kinds of microbial fermentation liquor, namely, 0.06-0.15 part of pseudomonas fluorescens solution, 0.04-0.08 part of waxen bacillus solution, 0.06-0.10 part of bacillus subtillis solution and 0.05-0.08 part of bacillus circulans solution, which are mixed in proportion. The composite microbial inoculum can promote the biogas generating pit to generate biogas normally in winter and can prepare the biogas by taking straws as main raw material.

The invention relates to a measuring method of adhesive strength, and in particular relates to a measuring method for adhesive strength of flexible substrate material coating. The measuring method for adhesive strength of flexible substrate material coating comprises the following steps: measuring the interior binding power of the coating and measuring the bonding strength between the coating and a substrate; the measurement of the interior binding power of the coating comprises the following steps: calculating the interior binding power of the coating according to the formula: theta=F/S, wherein F is stripping force, S is the width of the binding strip; the measurement of the bonding strength between the coating and the substrate comprises the following steps: winding a coating body on stainless steel bars with different diameters, and calculating the strength value of the binding power between the coating layer and the flexible substrate according to the separation state between the coating layer and the flexible substrate during winding. According to the measuring method, the repeatability is good, the operation is simple, the defects that the measurement result subjectivity is strong and the repeatability and the veracity are poor in the grid method in the prior art can be overcome. The defect that the coating is impacted by 180-degree bending during the testing process of the stripping method is also overcome, and the interior adhesive force of the coating and the adhesive force between the coating and the flexible substrate are separately measured.

The invention provides a polystyrene-divinylbenzene microsphere used for absorbing bilirubin. The diameter of the polystyrene-divinylbenzene microsphere ranges from 5 Mu M to 25 Mu M, which is controllable. The polystyrene-divinylbenzene microsphere is monodisperse and porous with the specific area from 200m<2>/g to 800m<2>/g. The polystyrene-divinylbenzene microsphere is prepared with styrene and divinylbenzene as a monomer and a cross-linking agent, as well as toluene, ethylbenzene, normal heptane, normal octane, n-heptyl alcohol or the mixture of the toluene, the ethylbenzene, the normal heptane, the normal octane and the n-heptyl alcohol as a pore-foaming agent by adopting the seed swelling polymerization method. In the method for preparing the polystyrene-divinylbenzene microsphere, seed solution and the emulsion prepared with the monomer, the cross-linking agent and the pore-foaming agent are further swollen and polymerized to get the polystyrene-divinylbenzene microsphere which is applied for absorbing bilirubin in solution or blood. The polystyrene-divinylbenzene microsphere has the advantages that the diameter of the microsphere is uniform and is controllable in a range, and the microsphere is very efficient for absorbing or removing bilirubin in solution or blood; the preparation process is simple and highly repetitive, which can be executed in large scale.

The invention provides a color difference meter for color measurement and a color measuring method thereof and belongs to the technical field of color measurement. A LED light source is connected with a light path of a collimation lens through an arranged ground glass and an aperture, the back part of the collimation lens is provided with a spectroscope, wherein, the reflected light is connected with the light path of a reference light sensor after reflected by the reflector; the transmission light is connected with the light path of an integrating sphere; the reference light sensor and a measurement light sensor connected with and arranged on the integrating sphere are respectively connected with an embedding processor in a transmission way; the integrating sphere is provided with a sample pool corresponding to the position of the transmission light. The invention adopts the light source consisting of a blue chip, a purple chip and flurescent powder, the reference light sensor is adopted to monitor light source fluctuation and eliminates non-stability of the light intensity of the LED light source as well as reduces the error due to the light source fluctuation. The reference light sensor and the measurement light sensor transforms the optical signal into the electric signal and then the electric signal is sent into the embedding processor after processing, at last, color measurement or color difference measurement can be achieved after the procession of the embedding processor. The invention has simple structure, low power consumption and good repetitiveness of the detected result.

A method for determining non volatile organic acids in tobacco is as below: first extracting treatment liquid corresponding to a tobacco sample: crushing the tobacco sample and placing the sample in a food grade double-layer composite bag, adding 25-50ml of sulfuric acid methanol solution and 1ml of 2.0 mg / ml adipic acid internal standard solution in every 1.0000g of the tobacco sample; then conducting heat sealing on the double-layer composite bag and pressure treatment under 600-900 MPa for 10-15 min to obtain an ultrahigh pressure treatment liquid; then taking 10ml of the ultrahigh pressure treatment liquid, adding 20-30 ml of saturated NaCl solution, extracting with dichloromethane for 6 times, merging the extraction liquid, and adding 3.5 g of anhydrous sodium sulfate for drying; and determining the extraction liquid by gas chromatography to confirm the content of nonvolatile organic acids in tobacco. The method for determining nonvolatile organic acid in tobacco is carried out under ambient temperature, and has the advanategs of fast detection speed, no side effect, the determination value close to the theoretical value, good repeatability and high reliability.

The invention discloses a multi-scale uniform and single-dispersion magnetic microsphere and a preparation method of the multi-scale uniform and single-dispersion magnetic microsphere. The multi-scale uniform and single-dispersion magnetic microsphere comprises spinel structure ferrite doped with transition metal elements, the microsphere is a polycrystal micro-nano sphere which is formed by nanocrystalline in an aggregation mode, the diameter of the microsphere ranges from 20nm to 1.23 micrometers, the specific surface area of the microsphere ranges from 0.94 m<2>*g<-1> to 17.31 m<2>*g<-1>, and the size of the nanocrystalline ranges from 9.2nm to 25.8nm. A mixed solvothermal method is adopted, and the size and the composition of particles can be adjusted through adjustment of the volume fraction of water or the ratio of iron to other transition metal salt. According to the preparation method, raw materials are low in price, and can be easily obtained, the cost is low, the technology is simple, the requirement for equipment is low, efficiency is high, and popularization is easy; the multi-scale uniform and single-dispersion magnetic microsphere has the advantages that single dispersion and uniformity are good, and the size and the composition can be adjusted; the multi-scale uniform and single-dispersion magnetic microsphere can have the broad application prospect in the fields such as the magneto-rheological field, the magnetic separation field, the catalysis field, the electrode material field, the pigment field, the high-density magnetic recording material field and the medical diagnosis field.