80results about How to "Does not change shape" patented technology

The invention provides metal ion modified black phosphorus as well as a preparation method and an application of the metal ion modified black phosphorus. The preparation method comprises the following steps of placing black phosphorus raw materials in a metal ion organic solution, performing impregnating under the temperature of 0-50 DEG C for 5min to 2h, and then performing blow-drying under protective gas so as to prepare the metal ion modified black phosphorus. The invention further provides the metal ion modified black phosphorus prepared by the preparation method, and the application of the metal ion modified black phosphorus in thin-film transistor materials, battery negative electrode materials, flexible display materials, light emitting diode materials, optical switch materials and biosensor materials. The metal ion modified black phosphorus provided by the invention can utilize the metal ions to improve the structural stability and the property stability of the black phosphorus in the existence of water and oxygen gas under the condition of being not changing the intrinsic attributes of the black phosphorus, so that the antioxidant ability of the black phosphorus is improved.

Provided is a method of mold silicone filling, making and peeling animal specimen. The method of mold silicone filling, making and peeling the animal specimen is characterized in that Sumianxin is injected into animal muscle to enable an animal to be conducted mercy killing, scarfskin of an animal body is peeled and separated from both a head and the animal body, corrosion prevention powder is coated on the inner surface of the scarfskin which is peeled; the animal muscle and bones are posed to be cooled and frozen and the design is finalized; the model is completely coated by oil mud, the animal body model coated inside is taken out after the oil mud is dried, release agent is coated on the inner surface of the model; model silicone and curing agent are mixed and poured into the model, specimen prosthesis is taken out after silicone is molded; original scarfskin of the animal is coated on the silicone prosthesis, incision in stomach is sewed, ocular prosthesis is assembled on the eye portions, and modeling is finished. The method of mold silicone filling, making and peeling the animal specimen has the advantages of being capable of eliminating the problem of being damaged by worms, reducing environment pollution due to the fact that high toxic preservation is not used, prolonging storage time of the specimen, and increasing sense of reality and hand feel of the specimen, meanwhile fast in drying, free from deformation, low in manufacturing cost and convenient to operate.

The invention discloses a method for preparing large-area high-performance color stainless steel by laser oxidation coloring, relating to the field of material surface modification. The steps are as follows: 1) treating the stainless steel to be a certain size; 2) carrying out pre-treatment on the treated stainless steel; 3) carrying out large-area color treatment of laser oxidation after pre-treatment; and 4) preparing the large-area high-performance color stainless steel by simple after treatment to the stainless steel with oxidation coloring. The method uses optical-heat-chemical effect oflaser to generate oxide films with difference types and thicknesses, colors the surface of the stainless steel together by self color of the oxide films and interference effect of the films, and adopts a specially-made rotating laser head to prepare large-area curved or flat color stainless steel. The large-area color stainless steel prepared by the invention has more stable color film layer, rich color, good reproducibility, high hardness and good wear resistance, also has simple technique, easy operation and no pollution and is suitable for batch production on large scale.

The invention discloses a preparation method of hollow carbon nanospheres with MOFs (metal-organic frameworks) formed through limited-range growth inside and belongs to the technical field of nanomaterial production. Tetraethyl orthosilicate, ethanol, deionized water, ammonium hydroxide, resorcinol and methanol are mixed for a reaction, SiO2@resorcinol-formaldehyde resin microspheres are obtained and calcined in argon, SiO2@C nanospheres with a core-shell structure are obtained and dispersed in a sodium hydroxide water solution to be etched, and mesoporous hollow carbon nanospheres are obtained; finally, the mesoporous hollow carbon nanospheres are dispersed in methanol, metallic nitrates and 2-methylimidazole are added for a reaction, and the hollow carbon nanospheres with MOFs formed through limited-range growth inside are obtained. Equipment used in the method is simple, the method is low in cost and simple in operation process, materials required in the reaction process are low in toxicity and harmless, the stoichiometric ratio of multi-component materials can be effectively controlled, and the obtained products are uniform in size, uniformly distributed and are good in morphological control.

The invention relates to coarse cereal bread flour and a preparation method of the coarse cereal bread flour, and belongs to the technical field of grain processing and processing of food raw materials. According to the coarse cereal bread flour, high-gluten wheat flour is used as basic flour, auxiliary flour is added, and puffing coarse cereals are added, so that the prepared granular coarse cereal bread flour has favorable processing properties and excellent baking quality; besides, the coarse cereal bread flour is used for making bread, various respects of mouth feel, digestibility and the like are better than those of common bread flour, and the nutrition is more reasonable. The auxiliary flour is at least one of wheat bran flour, coarse cereal flour and coarse cereal bran flour, wherein the coarse cereal flour includes but is not limited to buckwheat flour, oat flour, corn flour and black rice flour; the coarse cereal bran flour includes but is not limited to buckwheat bran flour, oat bran flour, corn bran flour and black rice bran flour; the puffing coarse cereal flour includes but is not limited to puffing oat flour, puffing buckwheat rice and puffing sorghum rice. According to the characteristics of the raw materials, the raw materials are processed through various technologies, so that the condition and the mouth feel of the made bread are both better than those of like products sold in the market.

The invention belongs to preparation methods of visible light responsive photoelectric electrode materials and relates to a ZnIn2S4 nanosheet array structure and a preparation method thereof. The preparation method includes: preparing a hydrothermal reaction precursor solution, adding soluble divalent zinc salt and trivalent indium salt, thiourea and suitable hydrochloric acid sequentially into water, and mixing well until a clariid solution is obtained and no insoluble precipitate occurs; transferring the precursor solution and a substrate into a hydrothermal reactor, keeping the conductive side down, heating to 200-250 DEG C, and allowing reaction for 2-6 h; after the reactor cools naturally, taking out the reaction product, washing, and drying. The prepared ZnIn2S4 nanosheet array structure has the advantages of large specific area, visible light responsiveness, monocrystal ordered structure, good adhesion, corrosion resistance and the like; the ZnIn2S4 nanosheet array structure maygrow on various substrates and is applicable to the fields, such as hydrogen generation by photoelectric catalytic decomposition of water, sewage treatment, biosensing, and solar cells. The preparation method is simple and nontoxic, is easy to perform, has a wide window of preparation process parameters, has low preparation cost and is suitable for industrial production.

The invention relates to a water-soluble oxidized regenerated cellulose hemostatic material and a preparation method thereof, solving the problem that the traditional oxidized regenerated cellulose materials are water-insoluble and have the defects of high polymerization degree, poor biological absorbability and slow haemostatic speed. The water-soluble oxidized regenerated cellulose hemostatic material is prepared from an alcoholic solution of oxidized regenerated cellulose and strong alkali. The preparation method comprises the following steps of: (1) neutralizing and modifying; (2) washing; and (3) drying. The product provided by the invention can be used in the medical hemostasis field.

The invention belongs to the technical field of biological fouling protection, and relates to an antifouling and antibacterial treatment method for a titanium and titanium alloy surface, which comprises the following steps: firstly, performing plasma activation on the titanium or titanium alloy surface, placing above a silane coupling agent and cyclohexane mixed solution, and vacuumizing a dryer for vapor deposition; then, placing titanium metal of which the surface is modified with silane coupling agent in a mixed solution containing dopamine and a hydrochloric acid solution of tris (hydroxymethyl) amino methane hydrochloride, and placing in a flask; adding methylbenzene and triethylamine, introducing nitrogen and dropwise adding bromo-isobutyryl bromide for reaction, then taking out, washing, blow-drying, and placing in another flask; sequentially adding 2,2'-Bipyridine, water, methanol and methy-propylene-acyloxy modified lycine, and then introducing nitrogen continuously; then adding cuprous bromide for performing polymerization, placing in a silver nitrate aqueous solution for reaction, and then washing thoroughly, thus realizing the antifouling and antibacterial treatment for the titanium metal surface. The process is simple, the operation is convenient, the suitable environment condition is wide, the broad-spectrum property is good, and the method has good antifouling and antibacterial performance.

The invention provides a method and a device for improving electrical interference resistance of an SNSPD system. The SNSPD system comprises an SNSPD device and a bias tree; the bias tree is provided with a DC (direct current) port, a DC & RF (radio frequency) port and an RF port; the DC & RF port of the bias tree is connected with one end of the SNSPD device, and the other end of the SNSPD device is grounded; and the method for improving the electrical interference resistance of the SNSPD system is as follows: a resistor is connected between the DC port and the grounded end of the SNSPD device. According to the method and the device for improving the electrical interference resistance of the SNSPD system, the operation is simple, the structure of the device is not changed, a filter circuit or a shield is not required to be added, the electrical interference resistance of the system can be improved only by connecting the resistors with appropriate resistance values in parallel, and the cost is low; the shape, the amplitude and the width of a detection electrical pulse signal are not changed; a reflected impulse cannot be produced, so that the device performance is not affected; and the dark counting rate and the quantum efficiency of the detection system are not affected.

The invention relates to magnesium phosphate cement as well as a preparation method thereof. The magnesium phosphate cement at least comprises the following components in parts by weight: 100-400 parts of sintered magnesia, 100 parts of phosphate and 5-80 parts of a compound retarder, wherein the sintered magnesia is a calcined product of a salt lake-based lithium by-product magnesium oxide; and the compound retarder comprises a mixture of at least two of glucose, sucrose and chloride, and can also comprise citric acid. The preparation method of the magnesium phosphate cement comprises the following steps: mixing the sintered magnesia and the phosphate with the compound retarder, and carrying out ball-milling to obtain the magnesium phosphate cement. The compound retarder can be applied to a bone repair surgery. According to the magnesium phosphate cement disclosed by the invention, the hydration reaction rate and the hydration temperature are reduced; meanwhile, the strength of the magnesium phosphate cement meets the requirements; the operation is simple; and the cost is relatively low.

The invention relates to the technical field of the isotope labeling and in particular to a circular system for a cultivating abundant isotope carbon and nitrogen double-labeling plant sample. The circular system for the cultivating abundant isotope carbon and nitrogen double-labeling plant sample comprises a sealed cultivation chamber, a CO2 injector, a gas balancing device, a nutrient solution injector and a nutrient solution circular system. The sealed cultivation chamber comprises a transparent cover and a base. The transparent cover is internally provided with a semiconductor condensation dehumidification device. The transparent cover is connected with the CO2 injector and the gas balancing device. A cultivation basin, a liquid storage chamber, an external peristaltic pump, an ultraviolet sterilizing device, a circular peristaltic pump and a converging pool are successively connected to form a circular loop of the nutrient solution circular system. The converging pool is connected with the semiconductor condensation dehumidification device and the nutrient solution injector. The cultivation basin and the liquid storage chamber are installed in the base. The top of the cultivation basin is communicated with the transparent cover. Silica sand is installed in the cultivation basin. The circular system for the cultivating abundant isotope carbon and nitrogen double-labeling plant sample is capable of simultaneously labeling the carbon and nitrogen isotope, and realizing the cyclic utilization. The pollution of normal 12 C and 14 N is avoided, and an abundant carbon and nitrogen isotope double-labeling plant can be obtained.

The invention provides a method for bonding a vacuum thermal insulation plate, a method for preparing refrigeration equipment and the refrigeration equipment. The method for bonding the vacuum thermal insulation plate comprises the following steps: foaming glue is sprayed on the nonplanar surface of a workpiece to be treated; the vacuum thermal insulation plate is put on one side, far from the nonplanar surface of the workpiece to be treated, of the foaming glue; and the pressure perpendicular to the nonplanar surface is applied to the vacuum thermal insulation plate. The method can quickly and effectively bond the vacuum thermal insulation plate on the nonplanar surface, has no need to change the surface shape of a VIP plate, prevents preparation of a special-shaped VIP plate, reduces the use cost of the VIP plate, and prolongs the service life of the VIP plate.

The invention provides a pulse current repairing device for microcracks in metal pipes and a pulse current repairing method for the microcracks in the metal pipes and relates to the field of microcrack arresting and repairing. The objective of the repairing device and the repairing method is to solve the problems that the non-plane type parts particularly the tube-shaped parts are difficult to beclamped, prone to bad contact and dangerous in operation to a certain extent because of a larger pulse current density in the prior method of using the pulse current for metal treatment, and moreoverthe prior method of using a sensing heating power supply for repairing the cracks in the metal pipes is bad in repairing effect of the metal pipes made of a nonferromugnetic material. A pulse power supply discharges to a spiral coil at the discharge voltage of 1-20KV and the the deformation caused by the extrusion of the spiral coil to the metal pipes is limited by using a fixing shaft for supporting the metal pipes, so that the microcracks in the metal pipes can be arrested and repaired. The device and the method are used for repairing the microcracks in the metal pipes.

The invention provides a passive-signal enhancement antenna sheet for an iphone full-card NFC scheme. An antenna is in the form of a sheet when unfolded. According to the passive-signal enhancement antenna sheet, a flexible circuit board and the antenna with metal additionally arranged on an equivalent flexible substrate or the antenna with a wound fine metal wire are adopted. The antenna comprises a small-sized spiral coil and a large-sized spiral coil which are connected in series. The shape of the small-sized spiral coil is similar to a rectangle. The size of the small-sized spiral coil is identical to the size of the portion, on the side surface of an iphone, of an iphone card support, and the small-sized spiral coil is arranged outside the card support of a SIM card on the side surface of the iphone. The large-sized coil is folded to the back surface of the iphone. The size of the large-sized coil is not larger than the size of the back surface of the iphone. By the adoption of the passive-signal enhancement antenna sheet for the iphone full-card NFC scheme, the defect that it is difficult for a reader to receive sent signals of the SIM card of the iphone is overcome, the shape of the SIM card and the universality of the iphone are not changed, and the communication mode with durability and high robustness is also achieved.

The invention relates to a die cutting device for a miniaturized foam product. The foam product comprises a release film layer, a double-sided adhesive tape layer and a foam layer which are sequentially adhered together from bottom to top, the length of the foam layer is greater than that of the double-sided adhesive tape layer, and the die cutting device comprises a composite material belt feeding unit, a double-sided adhesive tape die cutting unit, a double-sided adhesive tape waste discharge unit, a foam feeding unit, a foam die cutting unit and a foam waste discharge unit which are sequentially arranged along the moving direction of a material belt. Compared with the prior art, a whole adhesive area is die-cut on the double-sided adhesive tape layer by using a double-sided adhesive tape die cutter, the problems of displacement, adhesive overflow and the like of double-sided adhesive tape are avoided, the outer contour of the foam product is die-cut on the foam layer by using a foamdie cutter, and a product adhesive area and a double-sided adhesive tape waste area in the whole adhesive area are simultaneously cut apart, so that the processing steps are simplified, smooth die-cutting processing of the foam product is realized, problems of adhesive overflow, difficulty in waste discharge, product falling and the like are avoided, and product quality is guaranteed.

The invention discloses ceramic metal powder and a preparation method and application thereof, and belongs to the technical field of 3D printing. The preparation method comprises the following steps:mixing a nano ceramic powder suspension and a metal powder suspension to enable nano ceramic powder to be uniformly adhered to the surface of metal powder. The nano ceramic powder and the metal powderare arranged in a suspension form and then mixed, so that a nano phase can be effectively and uniformly adhered to the surface of the metal powder, morphology, granularity and flowability of the metal powder are not changed, meanwhile, uniform distribution of the nano phase in the selective laser melting forming process is achieved, and cracks, stress concentration, segregation-free and the likeare reduced. Moreover, the method can overcome the defects of long period and high cost of developing new materials suitable for the SLM technology at present. The ceramic metal powder prepared through the method is good in fluidity, high in sphericity degree and particularly suitable for the selective laser melting technology.

The invention relates to an aluminum-gallium alloy and a preparation method thereof, wherein the aluminum-gallium alloy is a two-phase structure, and a metal gallium is distributed along an aluminum alloy grain boundary to form the two-phase structure. The aluminum-gallium alloy preparation method comprises: placing a metal gallium into a sealed flask, placing the sealed flask into a water bath kettle to heat to a temperature of 50 DEG C so as to melt the metal gallium in the flask to achieve a liquid state, and maintaining a constant temperature to be spare; taking a metal aluminum, and adopting a mechanical scraping method to remove a surface oxidation film under protection of an inert gas such as an argon gas medium so as to expose a pure aluminum substrate; and covering the liquid state gallium on the surface of the exposed pure aluminum substrate continuously under the protection of the inert gas, then placing into a vacuum heating furnace, and carrying out heat preservation for 10-60 min at a temperature of 50-200 DEG C to prepare the aluminum-gallium alloy, wherein a thickness of the thinnest region of the coating is 1-10 mm. According to the present invention, the process is simple, the aluminum material is not subjected to excess processing, the amount of the metal gallium is significantly reduced, the cost is reduced, the prepared aluminum-gallium alloy has good stability in dry air, and can rapidly react with water to produce a large number of hydrogen, and strong economy is provided.

The invention belongs to the field of mask protection, and particularly discloses a recyclable mask, a preparation method and a recycling method. The recyclable mask comprises mask fibers serving as a substrate and a highly-compact nano-film which is formed by complexing polyphenol metal and wraps the surface of the substrate. Compared with masks prepared by other improvement means such as adding an activated carbon layer and a graphene layer and installing an air filter, the mask does not change the original shape of the mask, normal wearing is not affected, meanwhile, the structure and components of original fibers of the mask are not changed, and the air permeability is also improved. Neither polyphenol nor metal ions can be fixed on the mask fibers independently, through compounding and two times of spraying, the polyphenol and the metal ions form a high-density nano-composite on the surface of the mask fibers, and the adhesivity and the antibacterial property of the nano-composite enable the mask to have higher particle interception efficiency and sterilization, antivirus and inactivation capabilities.

The invention relates to a connection structure for a shunt sheet and a wiring terminal on an intelligent electric meter, and a method for detecting a connection state. The method comprises the steps: enabling a connecting terminal of a shunt sheet of a relay to be machined into a terminal with a rack structure, wherein a wiring terminal connected with the connecting terminal is provided with a terminal with a rack structure; enabling two terminals with rack structures to be connected in an engaged manner, wherein the engagement joint is clamped by a clamp and the clamp is provided with a wiring end connected with a detection line; detecting a voltage V through the detection line, carrying out judgment, and obtaining the connection state of a product. The structures in engaged connection is reliable in connection and is large in contact area. Moreover, there is no need of punching, the shape of a conductor is not changed, the resistance of a contact part cannot be increased because of product, and the heating also cannot be caused. An elastic steel card is made of elastic materials, and cannot be loosened because of bumping and shock. The above method enables an electric meter, which may heat, to be directly screened out in a production process during meter calibration, thereby guaranteeing the stability of the quality of the product.

The invention discloses a battery pack and a vehicle with same. The battery pack comprises a box body; a cover body, wherein the box body is covered with the cover body, so that a containing space isdefined between the box body and the cover body; a battery module which is arranged in the accommodating space; wherein the cover body is provided with an anti-vibration piece, and the anti-vibrationpiece is at least arranged at the maximum vibration mode area of the cover body. According to the battery pack disclosed by the invention, the anti-vibration part is at least arranged in the area withthe maximum vibration mode of the cover body, so that the first-order mode of the cover body is improved, the amplitude and abnormal sound of the cover body are reduced, the shape of the cover body is not changed, and the air tightness of the battery pack is not influenced.

The invention discloses a paper box forming face paper feeding device and method. The device comprises a fast paper separating device, a first conveying device, a gluing component, a second conveyingdevice and a pushing device. The method comprises the processes of fast paper separation, gluing, conveying and pushing. The quick paper separating method comprises the following steps of: separatingpiled face paper into single sheets, and placing the single sheets on the conveying devices. The gluing method is to glue the face paper. The conveying method comprises the following steps of: conveying the single sheets of face paper to the gluing component and conveying the glued face paper to the pushing device. The pushing method is to push the face paper to the next working position. According to the paper box forming face paper feeding device and method, the face paper can be quickly separated and glued under the condition of high-speed automatic production, and can be accurately and quickly pushed to a next paper box forming preset working position.

The invention discloses a method for improving the cooling effect of a pure aluminum cooling fin. A porous aluminum oxide layer which is of a nano structure is formed on the surface of the pure aluminum cooling fin in an electrolyte through anode oxidization. By forming a layer of aluminum oxide nano holes in the surface of the pure aluminum cooling fin, the cooling capability of the cooling fin is improved without increasing the number of cooling fins.

The present invention provides a preparation method of grapheme-based electrode materials through a defect initiation, and relates to a preparation method of grapheme-based electrode materials. The objective of the invention is to solve the problem that the process of the improvement of the wettability of grapheme sheets vertically grew in the prior art is relatively complicated, because the grapheme materials with different microstructures are prepared through a plurality of synthetic methods and through regulation of a plurality of parameters in such a manner that the degree of the improvement and the mechanism of the surface modification are hard to be accurately grasped, and the chemical modification methods relate to the selection, the preparation and the chemical reactions of chemical medicines. The preparation method of grapheme-based electrode materials through the defect initiation comprises: (1) depositing; (2) etching; and (3) closing a radio-frequency power supply and a heating power supply, defining Ar as a protective gas to be cooled to the room temperature, and completing the preparation method provided by the invention. The present invention is used for the preparation method of the grapheme-based electrode materials through the defect initiation.

An air conditioning system for a vehicle, adapted to supply conditioning air into the vehicle interior, the air conditioning system comprising: a conditioning air generating section for generating conditioning air; air delivery ducts communicating with different portions within the vehicle interior; and a flow dividing and guiding section provided as a separate unit from the conditioning air generating section, the flow dividing and guiding section dividing the conditioning air, which is discharged from the conditioning air generating section, and guiding the divided air streams to the air delivery ducts. The configuration enables the conditioning air generating section to be used in common irrespective of the layout and shape of air delivery ducts.

The invention discloses a high-bonding-strength high-temperature-oxidation-resistant porous MCrAlY abradable coating and a preparation method thereof, and belongs to the technical field of gas turbines. The preparation method comprises the following steps: preparing MCrAlY / pore-forming agent composite powder; preparing a bottom layer; thermally spraying MCrAlY / pore-forming agent composite powder on the bottom layer to prepare an MCrAlY surface layer; carrying out medium-temperature heat treatment under an atmospheric condition to remove the pore-forming agent, so as to obtain a porous MCrAlY surface layer; and carrying out high-temperature heat treatment under a vacuum condition to obtain the porous MCrAlY abradable coating. The porosity of the coating is 20-60%, the hardness is lower than85HR15Y, and the bonding strength is higher than 20MPa and is more than 2.5 times that of the prior art; and the antioxidant life at 1000 DEG C is longer than 2500h and is 2.7 times or more of that in the prior art. The high-pressure turbine blade tip gas path sealing device is widely applied to high-pressure turbine blade tip gas path sealing of aero-engines, ground gas turbines and marine gas turbines.

The invention discloses a processing technology of moisture absorption and sweat discharge fiber. The moisture absorption and sweat discharge fiber is processed by the following steps of: singeing, flatly dyeing, shaping, dyeing, tentering and pre-shrinking; the dyeing and finishing pretreatment adopts enzyme treatment; low-temperature type dye is selected during dyeing; the fiber is not damaged in the processing process; no auxiliary agent is not adopted in the after treatment; and the capabilities of moisture absorption and quick-drying of the fiber can be improved. After the dyeing and finishing processing of the moisture absorption and sweat discharge fiber is adopted, the shape of the fiber is not changed, the cross section of the processed fiber is still in a rhombus, and the functions of moisture absorption and sweat discharge of the fiber can be guaranteed.

Disclosed are a method and device for reducing power consumption of a Bluetooth receiving device, and a storage medium, the method being applied to a clock synchronization communication device, the method comprising: issuing first synchronization information to a Bluetooth transmitting device and a Bluetooth receiving device, the first synchronization information comprising a receiving time window, the Bluetooth receiving equipment being in a working state in the receiving time window and being in a dormant state in the dormant time window; judging whether confirmation information sent by the Bluetooth sending equipment and / or the Bluetooth receiving equipment is received or not; if confirmation information sent by the Bluetooth sending device and / or the Bluetooth receiving device is received, determining that the first synchronization information is successfully issued, wherein the Bluetooth sending device sends a data packet to the Bluetooth receiving device based on the time slot distribution information after receiving the first synchronization information, so that the Bluetooth receiving device receives the data packet in the receiving time window. Through the mode, the power consumption of the Bluetooth receiving equipment can be reduced, and the service time of the Bluetooth receiving equipment can be prolonged.

The invention provides a surface cobalt-doped zinc oxide composite material as well as a preparation method and application thereof, and belongs to the field of inorganic composite materials. The method provided by the invention adopts a simple and convenient hydrothermal process to realize Co doping on the surface of zinc oxide through a two-step hydrothermal process to prepare the surface cobalt-doped zinc oxide material, realizes effective doping of the surface of a substrate material, improves the problems that an overall doping method in a past research and technology has a low surface catalytic effect and an internal crystal lattice structure is affected, has the advantages of being simple and having a safe preparation process and reaction solvent, and prepares the material which has multi-level structural characteristics and a uniform overall morphology and is composed of nanoparticles, and the doping addition amount of cobalt on the surface is <=3 wt%.

The invention provides a universal planetary gear reducer for an outer rotor type motor. The universal planetary gear reducer comprises a motor, a flange plate type sun wheel, a planet wheel and planet carrier assembly, an inner gear ring and a supporting frame assembly, and the flange plate type sun wheel comprises a flange plate and a gear shaft fixed at the center of the flange plate; the flange plate of the flange plate type sun wheel is fixed to the rotating center of the motor, the gear shaft of the flange plate type sun wheel is connected with a planet wheel and a planet carrier of the planet wheel and planet carrier assembly, the planet wheel of the planet wheel and planet carrier assembly meshes with the inner gear ring, and the planet carrier of the planet wheel and planet carrier assembly is used for outputting power of the motor; and the supporting frame assembly is arranged outside the motor, the flange plate type sun wheel and the planet wheel and planet carrier assembly in a sleeving mode and is fixed to the motor and the inner gear ring. The shape of the motor is not changed, and speed reducers can be additionally arranged on most outer rotor type motors only by replacing parts connected with the motors in order to adapt to different motors.