290results about How to "Effective size control" patented technology

The invention refers to a high-solid content acrylate micro-latex, its making method and its application to carpentry dope. It adopts the technique of half-continuous starvation feeding, and is obtained by the polymerizing method of seed latex. It leads into cross-linking groups in the course of polymerization such as amidogen, acetoacetyl and amido, depends on the reaction of the groups of form film, gets painting film with cross-linking construction, and improves the water and solvent resistance of the painting film.

The present disclosure provides a lithium-ion battery positive electrode material and a preparation method thereof. In the lithium-ion battery positive electrode material, a secondary particle comprises lithium-containing multi-element transition metal oxide primary particles and a second phase material, a second phase material forms a second phase material layer distributed on a surface of the primary particle and forms a diffusion layer together with the lithium-containing multi-element transition metal oxide by means of atoms mutual diffusion to make the second phase material layer combined with the primary particle during formation of the secondary particle from the primary particles, thereby effectively suppressing chalking of the secondary particle along boundary among the primary particles, and effectively controlling size of the primary particles and the secondary particles, and improving specific capacity, cycling performance and safety performance of a lithium-ion battery to which the lithium-ion battery positive electrode material is applied.

The invention discloses a method for preparing phosphaalkene. The method comprises the following steps: dispersing black phosphorus into a dispersion liquid, and performing ultrasonic treatment for 0.5-200 hours and then performing solid-liquid separation to obtain intercalation black phosphorus; dispersing the intercalation black phosphorus into a chemical foaming agent solution, performing ultrasonic treatment for 0.5-200 hours and then performing solid-liquid separation, and drying solids subjected to solid-liquid separation to obtain a solid mixture of black phosphorus and a chemical foaming agent; performing microwave treatment on the solid mixture of black phosphorus and the chemical foaming agent under the microwave powder of 100-1,000W, and preparing a finished product phosphaalkene after 1s-1h of microwave treatment. The phosphaalkene prepared by the method disclosed by the invention is proper and uniform in size; furthermore, the technology is simple, the cost is low, the peeling time is short, and the phosphaalkene yield is high; large-scale production is easy to realize.

The invention discloses micro-nano copper powder and a preparation method thereof. The preparation method comprises the following steps that compounds containing copper are prepared into a solution, and a system A is obtained; pH conditioning agents, additives and reducing agents are added to the system A, and a system B is obtained and reacts at 50-100 DEG C; and filtration, washing and drying are conducted after reacting, and the micro-nano copper powder is obtained. In the system B, the molarity of the compounds containing copper is 0.001-4 mol/L, the concentration of hydroxyl ion (OH-) is 10<-4>-20 mol/L, the mass concentration of the additives is 0-40%, and the molar ratio of the compounds containing copper to the reducing agents is 1:0.1-100. According to the preparation method, the effective control over the morphology and the size of the micro-nano copper powder is achieved, and the mass content of the impurity phases in the prepared copper powder can be controlled below 0.3%; and in addition, the preparation method further has the advantages that the reaction process is easy to control, and the selected reducing agents are moderate in reducibility, non-toxic, and environmentally friendly.

The invention provides a controllable vibrating electrode electric spark and electrolytic combined machining technological method and device for a single group of micro holes and belongs to the technical field of special machining. An ultralow-concentration neutral salt solution is taken as a working solution, corresponding pulse voltage is applied between the two electrodes, the electrodes vibrate in a reciprocating mode in the feeding directions of the electrodes, the gap between the two electrodes is adjusted by controlling the vibration between the electrodes, and the gap between the electrodes is made to be smaller than a spark discharge gap when the electrodes vibrate in the forward direction, so that an electric spark reaction occurs; the distance between the electrodes is larger than the discharge gap when the electrodes vibrate in the negative direction, so that spark discharge is changed into an electrolytic reaction gradually; when the distance between the electrodes is too large, the electrolytic reaction is ended, the working solution is switched to be in the deionization state, then the next machining cycle is conducted along with the feeding of the electrodes, and controllable combination of electric spark machining and electrolytic machining is achieved by optimizing the vibrating mode. By the adoption of the controllable vibrating electrode electric spark and electrolytic combined machining technological method and device, high surface quality can be obtained, and machining efficiency is improved; meanwhile, control over the machining process and machining consistency can be effectively guaranteed.

The invention discloses a ternary positive-electrode material prepared by a solvothermal method and a preparation method thereof. The preparation method includes: dissolving nickel cobalt manganese salt in a solvent, adding a surfactant and hydrolysis auxiliaries, sufficiently stirring, transferring into a reaction kettle, performing solvothermal reaction under certain temperature for 2-24 hours,cooling to room temperature, using a suction filtration method to separate out a nickel cobalt manganese ternary product, washing, drying, and pre-calcining in air to obtain a precursor; grinding andmixing the precursor and a lithium compound, and calcining to obtain the ternary positive-electrode material. The ternary positive-electrode material and the preparation method thereof have the advantages that the ternary oxide precursor prepared by the solvothermal method is small in particle size, uniform in particle distribution and controllable in morphology as compared with a ternary precursor prepared by a conventional precipitation method, so that the finally prepared ternary material is small in granularity, uniform in particle size distribution and controllable in morphology and has excellent electrochemical performance, and the capacity and stability of the prepared ternary material are better than those of a ternary positive-electrode material prepared by the precipitation method.

The invention discloses a preparation method for doped graphene foams. The preparation method comprises the following steps: adopting the hydrothermal method to enable nano particles to dope with and generate on oxidized graphene sheets to obtain oxidized graphene aerogel; reducing the oxidized graphene aerogel doped with the nano particles in a controllable manner at the low-temperature gaseous phase condition to obtain the doped graphene foams. According to the preparation method, a reductant is not used in the growing process of the nano particles, and liquid is not introduced into the reaction system, so that excessive overlap of the graphene layers is avoided, porosity of the graphene foams is maintained, polyporous shrinkage caused by surface stress is prevented, and the uniformly doped graphene foam material with the controllable appearance is obtained. The preparation method is convenient to operate, uniform in doping, controllable in product size, economical and fast, is adopted as the novel technology for the large-scale preparation of the doped graphene foam material, and is expected to provide novel materials for graphene adsorbents, graphene capacitors, graphene catalysts and the like.

The invention relates to a method for preparing zirconium dioxide ceramic microspheres with a microfluid device, belonging to the technical field of material synthesis and formation. The method comprises the following steps: by using zirconium dioxide precursor sol as an inner phase fluid, an oily solution as an intermediate phase fluid and an aqueous solution as a continuous phase fluid, preparing monodisperse water-in-oil-in-water double-emulsion drops with a microfluid device by regulating the flow rates of the three phases of fluids, adding an alkaline solution into the continuous phase to initiate the gel reaction, cleaning and drying the gel microspheres obtained by the gel reaction, and sintering to obtain the ZrO2 ceramic microspheres. The zirconium dioxide ceramic microspheres prepared by the method have the advantages of high sphericity and uniform dimension; on the micrometer level, the action of surface tension of the zirconium dioxide ceramic microspheres is far larger than the deformation generated by gravity; and the reaction synthesis on the sol-gel system by using the double-emulsion drops as the template has universality, thereby having potential application prospects in the nuclear fuel preparation.

The invention provides an internal curing process for improving the performance of high strength and slight expansion concrete, which comprises: mixing and stirring sand and stones, adding a gelled material, an expanding agent and a super absorbent resin; stirring the mixture for 30 seconds, adding water and a water reducer and stirring the mixture for 120 seconds; and filling the mixture into a mold. The water absorption of the super absorbent resin is between 150 and 300 times, the salt solution absorption capacity of the super absorbent resin is between 15 and 40 times, and the added amount of the super absorbent resin is 0.15 to 0.30 percent based on the mass of the gelled material. The process solves the problems of insufficient expansion rate, contraction, cracking and damages of later-stage secondary ettringite generation to the internal structure of the concrete, which are caused by curing. The internal curing technique effectively improves the moisture field in the concrete, the internal moisture content of the concrete and the hydration degree of the concrete, contributes to the full generation of the ettringite in the slight expansion concrete and improves the internal porous structure and compactedness of the concrete.

The invention relates to oxide dispersion strengthening iron-base alloy powder and a characterization method of the oxide dispersion strengthening iron-base alloy powder. The alloy powder comprises abase body and a strengthening phase, the strengthening phase comprises at least two kinds of strengthening phase particles with different sizes, the volume of particles with the diameter smaller thanor equal to 50nm accounts for 85-95% of the total volume of the strengthening particles, and the base body is Fe-Cr-W-Ti alloy. The characterization method of the oxide dispersion strengthening iron-base alloy powder comprises the steps that the strengthening phase is separated from the powder base body through electrolysis, and an electron microscope is adopted for analyzing and characterizing the strengthening phase.

The invention discloses a method for preparing a step micro-needle array in the technical field of biomedical engineering. The method comprises the following steps of: gapping a silicon etching window on a silicon chip through photoetching and performing wet etching on the silicon in the silicon etching window; cutting the silicon chip to obtain a micro square column array by using a slicing machine, and further cutting the micro square column array to obtain micro square blocks; and finally performing the wet etching on the micro square column array to obtain the step micro-needle array. Micro-needle arrays with different heights are prepared by the method, and the micro-needle arrays puncture into the skin in a progressive mode. Meanwhile, the method has the advantage of simple preparation process, and the step micro-needle array is prepared by adopting the method of combining the wet etching with machining, so the cost is low and the method is convenient to popularize.

The invention discloses a preparation method for a metal-doped lithium/carbon manganese phosphate (LiMXMn1-XPO4/C) composite from manganese phosphate. The method comprises the following steps: preparing active manganese phosphate materials (MnPO4) with different shapes by using a precipitation or sol-gel method; then subjecting prepared manganese phosphate, a lithium source and a metal-doped elemental compound to ball milling for 20 to 50 h and mixing with alcohol used as a dispersant; carrying out vacuum drying and crushing to obtain a crushed substance; placing the crushed substance in a stainless steel container, heating the crushed substance to a temperature of 450 to 800 DEG C in a furnace protected by an inert atmosphere and maintaining the temperature for 2 to 12 h; and rapidly placing the substance to a liquid coolant under the conditions of a high temperature and air isolation and carrying out rapid cooling so as to obtain the LiMXMn1-XPO4/C composite. The method provided by the invention has shortened process flow, can maintain particle activity in a high temperature, effectively gives rise to structural dislocation, improves the ionic migration rate and electronic conductivity of the composite and is suitable for large-scale industrial production.

The invention relates to a preparation method for shape-controllable nano iron oxide and particularly relates to a hydro-thermal synthesis method for shape-controllable nano iron oxide. The hydro-thermal synthesis method comprises the following steps: (1) weighing dihydric phosphate, strong acid and strong alkali salts and trivalent iron salt; mixing and adding a mixture into de-ionized water; agitating until the mixture is completely dissolved to obtain a precursor solution, wherein the mol ratio of phosphate radical ions to trivalent iron ions in the precursor solution is (0-3) to 10; the mole ratio of the strong acid and strong alkali salts to the trivalent iron ions is (0-5) to 10; the mass of the de-ionized water is 50-300 times as much as the total mass of the dihydric phosphate, the strong acid and strong alkali salts and the trivalent iron salt; and (2) putting the precursor solution into a reaction kettle and heating to 150-250 DEG C and preserving the heat for 2-4 hours; cooling to the room temperature and adding the de-ionized water and alcohol into an obtained product; sufficiently shaking and centrifuging; removing liquid supernatant and transferring content matters into an electric heating vacuum drying box; drying until the weight is constant to obtain the nano iron oxide.

The invention provides a non-ionic compound gas hydrate anti-agglomerant which consists of an alkyl polyglycoside non-ionic surfactant and a polyhydric alcohol non-ionic surfactant in a weight ratio of (0.01-100):1. The gas hydrate anti-agglomerant is used for anti-agglomerating treatment of an oil-gas-water three phase mixed conveying system, wherein the volume of water accounts for less than or equal to 60% of the total volume of oil and water. The invention further provides an anti-agglomerating method adopting the non-ionic compound gas hydrate anti-agglomerant. The method comprises the step of adding the non-ionic compound gas hydrate anti-agglomerant into the oil-gas-water three phase mixed conveying system. The non-ionic compound gas hydrate anti-agglomerant provided by the invention is suitable for oil-gas-water three phase co-existing systems and is less in use level, good in biodegradability, economic and environmental friendly and remarkable in anti-agglomerating effect.

The invention discloses a sliding mode adaptive controller with built-in brushless DC motor current loop control for a two-wheeled self-balancing robot. The controller at least comprises a sliding mode adaptive controller and a current loop active-disturbance-rejection controller, wherein the sliding mode adaptive controller is used for controlling an output motor torque T<w> according to an angle parameter Theta and an angular speed Theta-bar and converting the motor torque T<w> to a current i<*>, and the current loop active-disturbance-rejection controller is used for controlling an output voltage U<*><a0>(t) to drive a motor system to move according to the current i<*> and a motor current i detected by a sensor measurement module. With the adoption of the technical scheme disclosed by the invention, current loop control is added into the controller, thus, the size of the driving current is effectively controlled, a large current cannot be generated, the driving of a brushless motor is protected, the lifetime of a balance car is greatly prolonged, and the application safety of the balance car is greatly improved.

The invention discloses a method for controlling a detonator zone during the explosion cladding of a multilayer thick zirconium/titanium/steel composite plate. The method comprises the following steps: (1), welding a steel block to one side of a titanium/steel composite plate, and welding a titanium block to one side of a multilayer zirconium plate; (2), assembling the titanium/steel composite plate with the multilayer zirconium plate, ensuring that the titanium block is aligned with the steel block, then arranging an explosive on the surface of the multilayer zirconium plate, and mounting a satchel charge on the titanium block for explosion cladding so as to obtain the multilayer thick zirconium/titanium/steel composite plate. The method is easy in operation and convenient to implement, can effectively control the size of the detonator zone during cladding of the multilayer thick zirconium/titanium/steel composite plate, and thus solve the problem that a detonator zone is overlarge when a detonator is directly mounted on the surface of the multilayer zirconium plate. Besides, the detonator zone can be removed completely during the subsequent cutting of the multilayer thick zirconium/titanium/steel composite plate, and the size and the corrosion resisting property of the finished zirconium steel composite plate cannot be affected. The multilayer thick zirconium/titanium/steel composite plate prepared through the method can completely meet the requirements of subsequent large equipment.

The invention discloses a method for preparing high-quality molybdenum disulfide thin films with the layer numbers being uniform. Potassium chloride is used for assisting a chemical vapor deposition method in preparing of large-area single-layer molybdenum disulfide thin films on a silicon substrate covered by a silicon dioxide layer with the thickness being 300nm, and the single-layer molybdenumdisulfide thin films of different dimensions can be obtained by controlling the amount of different sorts of the potassium chloride. The method has the advantages that the high-quality molybdenum disulfide thin films with good homogeneity can be effectively prepared through the potassium chloride, and the experimental method is simple in technology, low in cost and suitable for mass production; the prepared molybdenum disulfide thin films can be used as two-dimensional transparent semiconductor films to be applied to the fields of photoelectric devices, flexible and transparent devices, optical detectors and the like; and the method is of high application value and significance to electronic material preparation and production.

A highly-dispersed catalyst for hydrogen peroxide synthesis and a preparation method thereof belong to the field of petrochemical engineering. The catalyst mainly comprises catalyst active ingredients and a catalyst carrier. All the catalyst active ingredients are supported on the carrier to form a granular catalyst. The main catalyst active ingredient is a platinum-family precious metal active ingredient which accounts for 0.01-2wt% of the total weight of the catalyst weighed on the basis of the simple substance of precious metal. The catalyst carrier accounts for 98-99.00 wt% of the total weight of the catalyst. The preparation method comprises the following steps: carrying out heat treatment on the platinum-family precious metal active ingredient under the action of a reducing agent and a protective agent to prepare nano-particle sol, supporting the nano-particle sol onto the granular catalyst carrier, and drying to prepare the catalyst. In comparison with a traditional catalyst prepared by an immersion method, the highly-dispersed granular catalyst has advantages as follows: problems of large crystalline grain of the active ingredients and low dispersity are overcome, and catalyst activity is raised. In addition, use of toxic reagents such as organic tin and the like is avoided during the preparation process. The preparation method is green and environmentally friendly and is suitable for production.

The invention belongs to a method for preparing barium sulfate particles through a microchannel method in the technical field of nanomaterial preparation. The method comprises the following steps: introducing a sulfate water solution and a barium salt water solution into a microchannel reactor for reacting and ageing, and centrifuging, washing and drying an obtained reaction solution, thus obtaining the barium sulfate particles, wherein selected sulfate is sodium sulfate, ammonium sulfate or sodium persulfate, and barium salt is barium chloride, barium acetate or barium nitrate. The morphologyand the particle size distribution of the obtained barium sulfate particles are controllable, and industrial application of medical dry films can be met to a larger extent.