30results about How to "Precise control of porosity" patented technology

The invention relates to a preparation method of a bionic artificial bone with a multistage [micrometer/nanometer] pore structure. The method is characterized by the following steps of: realizing 150-800 mum gradient through pores by selective laser sintering (the diameter of the light spot is micrometer scale); mixing and performing oxygenolysis on a small amount of high polymer microballoons in the sintering process to form 10-100 mum random spherical pores; finally obtaining the bionic artificial bone which has an three-dimensional hierarchical pore structure similar to that of a natural bone by a method of obtaining irregular pores in tens of nanometer surfaces by a corrosion process. In the invention, according to the requirement of an implanting position, the distribution, connectivity and the like of the gradient through pore can be accurately controlled by adjusting sintering process parameters; the shape, size and the like of the spherical pores can be controlled by precisely controlling the furnace temperature curve and high polymer particle properties; the size, quantity and the like of the nanometer pores can be controlled by controlling the corrosion liquid concentration and corrosion time. The preparation method disclosed by the invention has an important significance in creating a microenvironment beneficial to cell adhesion, proliferation and function exertion, improving forming of new bones, and increasing healing of bones.

The invention relates to a porous conductive ceramics, in particular to a porous conductive MAX phase (Ti3SiC2, Ti3AlC2 or Ti2AlC) ceramics with a through hole structure, and a preparation method and a use thereof. The porosity of the porous ceramics is adjustable within the range of 20-65%, the ceramics comprises a through hole structure, and the openporosity is more than 85%. The preparation method comprises the steps of taking MAX phase ceramic powder as a raw material, molding, carrying out pressureless sintering in an atmosphere furnace, keeping the sintering temperature at 1200-1400 DEG C, and leading the sintering time to be 0.5-3 hours. The MAX phase conductive ceramics with the through hole structure prepared by the pressureless sintering method can be used as a catalyst carrier material for automobile exhaust purification. The invention can solve the problems of liquid phase, a large number of closed pores in the generated hole and the like during the sintering process by optimizing the molding pressure, the sintering temperature and the time precise control of the porosity.

The invention discloses a preparation method of efficient increased-transmission and antireflection glass, which comprises the steps as follows: (1) the molar ratio of raw materials comprising silicon sources to deionized water to catalysts to solvents is 1:0.05 to 10:0.01 to 10: 10 to 300, the deionized water, the catalysts and the solvents are firstly mixed, heated and stirred at a uniform speed, when an obtained mixture is heated to 20 to 50 DEG C, the silicon sources are added to the mixture and stirred with the mixture for 2 to 40 hours at a maintained constant temperature and a uniform speed, and then silica nano-particle dispersion liquid is obtained; (2) polystyrene latex spheres are used as templates to be mixed with the silica nano-particle dispersion liquid obtained in the step (1) at a volume ratio of 1:5 to 5:1, and then a blended solution is obtained; (3) the blended solution obtained in the step (2) is coated on the surface of a photovoltaic glass substrate; and (4) the film-coated photovoltaic glass substrate is placed in a temperature condition of 300 to 700 DEG C to be sintered for 5 to 30 minutes, and then the efficient increased-transmission and antireflection glass is obtained. The preparation method has the advantages that the binding force between an antireflection film and the substrate is strengthened, and the durability of the thin film is improved; and besides, through controlling the diameter and the mixing proportion of the polystyrene latex sphere templates, the reflectivity of the thin film is accurately regulated, so that an obvious increased-transmission effect is achieved.

The invention provides a controlled release coating material containing polymer micro nanoparticles. The controlled release coating material comprises the following components: ethylene-vinyl acetate copolymerization polymer and a blending polymer alloy thereof; polyvinylpyrrolidone and complex microelements and drug thereof; and polymer micro nanoparticles. The controlled release coating material containing the polymer micro nanoparticles is adjustable in chemical structure and has good film-forming property and degradability; by adding the polymer micro nanoparticles with uniform particle size, the porosity and controlled release property of coating can be regulated; besides, by loading specific active substances in a chemical bonding manner, multi-functionalization of controlled-release fertilizer is realized. The controlled release coating material containing the polymer micro nanoparticles can be taken as a coating of an agricultural controlled release fertilizer and can be also taken as a pesticide controlled release coating and coatings of other medical products.

The invention belongs to the field of additive manufacturing, and discloses a method used for producing imitated coral artificial bone from cuttlebone, and obtained products. The method comprises following steps: a, cuttlebone powder and an adhesive are taken as raw materials, and are mixed so as to obtain a composite material used for additive manufacturing; b, a three dimensional model of the imitated coral artificial bone to be produced is designed, and additive manufacturing is carried out with the composite material obtained in step a based on the three dimensional model so as to obtain aprimary product; c, a diammonium hydrogen phosphate solution is prepared, the primary product is immersed in the diammonium hydrogen phosphate solution for hydrothermal reaction so as to obtain hydroxyapatite and finish production of the imitated coral artificial bone. The imitated coral artificial bone is excellent in artificial bone mechanical properties, and appropriate in degradation rate; the raw materials are widely available, renewable, and low in cost; and the method is of practical value in the medical field of bone repairing.

The invention relates to a multi-combination functional electrostatic spinning sub-micron fiber air filtering material and preparation thereof. The material is of a sandwich structure formed by sequentially arranging a spun-bonded non-woven fabric, a sub-micron fiber/microsphere composite film and a spun-bonded non-woven fabric. The preparation method comprises the following steps: preparing a low-concentration electrostatic spinning solution with additional functionality, preparing a high-concentration electrostatic spinning solution with additional functionality, preparing an electrostatic spraying polymer solution with additional functionality, preparing a sub-micron fiber composite membrane/non-woven fabric composite material, and preparing the sub-micron fiber air filtering material. The preparation method has simple and controllable process parameters, and the prepared filter material has good structural controllability.

The invention provides a manufacturing method for a chemical mechanical polishing pad, the chemical mechanical polishing pad manufactured by the manufacturing method and provided with a final point detecting window, and a matched single-piece or multi-piece combined type casting mould. In the process, the formed solid final point detecting window is embedded and nested into a polishing layer of the chemical and mechanical polishing pad through a once integrated casting and forming process, so that the polishing layer firmly bonded with the window is directly manufactured. The single-piece or multi-piece combined type casting mould is utilized for precisely controlling casting process parameters of the polishing layer with the window, and the obtained product polishing pad body is excellentin density distribution, cavity rate and uniformity of cavity size, so that integral process and quality stability of the polishing pad are obtained. The contact surface between the window of the product and the polishing layer body is bonded under chemical and physical dual effects, so that the bonding effect is extremely good, and therefore, a leakage phenomenon caused by cracks of the contactsurface in a using process is eliminated. Therefore, the manufacturing method has remarkable practical popularization value.

The invention belongs to the field of preparation of composite foam and particularly discloses preparation methods for non-macroscopic-interface density gradually-changed type composite foam. Actually, the two preparation methods are provided, specifically, the first method is used for preparing the density gradually-changed type composite foam by changing the wall thicknesses of hollow microspheres, and the other method is used for preparing the density gradually-changed type composite foam by adopting expandable microspheres. The methods are simple and high in designability, the porosity in the composite foam can be accurately controlled, and the density of the composite foam in different parts is controlled according to the design requirements. Due to the fact that all layers of the composite foam are co-cured to be formed by adopting resin matrixes of the same system, the interface of the composite foam of different densities is eliminated, the problems that due to the interface problem, composite foam structures of different densities are poor in adhesion, and sound absorption or sound transmission performance does not meet the requirement are solved, and the foam is mainly used as an energy absorbing material and a sound transmission material.

The invention relates to the cross technical field of porous metal and metal-based composite materials, in particular to functional gradient foamed aluminum and a preparation method thereof. The gradient foamed aluminum comprises at least one pure foamed aluminum layer and at least one carbon nanotube reinforced foamed aluminum-based composite material layer, wherein the porosity of the adjacent pure foamed aluminum layers is different; and the porosity of the adjacent carbon nanotube reinforced foamed aluminum-based composite material layers is different and/or the content of carbon nanotubes is different. According to the functional gradient foamed aluminum and the preparation method thereof provided by the invention, the density gradient and the component gradient are combined, the functional gradient foamed aluminum with the base material and the density changing at the same time is prepared, the gradient material can be designed in a targeted mode according to the service environment of the material, and the advantages of the gradient foamed material are fully played, so that the good energy absorption effect is achieved; and under the condition that the overall porosity is the same, the gradient foamed aluminum has higher stress level and higher energy absorption capacity compared with uniform foamed aluminum, so that the buffering and energy absorption performance of the gradient foamed aluminum is improved.

The invention relates to a method for preparing a carbon/carbon composite material SiC-MoSi2-C-AlPO4 composite gradient external coating, which is completed in a hydrothermal reactor at one time, does not need late heat treatment, maintains uniform thickness and does not generate through holes and cracks. At first, C-AlPO4 powder, silicone carbide nano powder and MoSi2 powder are weighed according to the mass ratio of (1-10):(1-20):(1-10) to be mixed, suspension liquids A, B and C of 20-40 grams/liter are then prepared, are subjected to ultrasonic concussion and magnetic stirring, and are then added with tellurium simple substance to prepare suspension liquids D, E and F with the tellurium simple substance concentrations of 0.5-2.0 grams/liter, an ultrasonic cathode rotary microwave hydrothermal electrophoresis arc discharge sedimentation method is adopted to sequentially deposit the suspension liquids D, E and F on a carbon/carbon composite material sample with a SiC internal coating, and finally, drying is carried out. The method has the advantages of short preparation period, simplicity in technological preparation, convenience in operation, easily-obtained raw materials and low preparation cost.

The invention discloses a preparation method of a novel staggered communication nanowire supercapacitor electrode, and belongs to the technical field of capacitor electrodes. The method comprises thefollowing steps: S1, preparing a bacterial cellulose solution with the concentration of 0.5%; S2, taking the prepared bacterial cellulose solution; freeze drying treatment, preparing the bacterial cellulose aerogel; S3, placing the obtained bacterial cellulose aerogel under a hot press for hot pressing, to prepare the compact bacterial cellulose aerogel; S4, putting the obtained compact bacterialcellulose aerogel into a vacuum tube furnace for carbonization treatment to prepare a compact micro supercapacitor electrode; and S5, compounding the obtained compact micro supercapacitor electrode with the sulfuric acid-PVA electrolyte to prepare the nanowire supercapacitor with high energy density. According to the invention, the density of the nanowire can be regulated and controlled, and the area loading capacity and porosity of the nanowire can be accurately regulated and controlled, so that the supercapacitor with high energy density and high power surface density is obtained.

A formable, porous chemiluminescent reactant composition, device (11) therefore, and a process for production thereof is disclosed. The fluidizable solid admixture (12) of the instant invention may be cured to a more or less rigid form with or without the use of a mold. The cured solid is useful as a chemiluminescent reactant component and is useful in a variety of environments.

The invention discloses a method for preparing a ZnO linear resistor with adjustable porosity. No additional process is added in the process of preparing the ZnO linear resistor, the method is simpleand easy to operate, and graphite powder introduced in the process of preparing of the ZnO linear resistor can be effectively excluded. The graphite powder used is non-toxic, inexpensive, and easy toobtain. Organic matter volatilization and carbonization gasification products in the sintering process are easy to collect and treat, and have no environmental pollution and no residue after sintering. The precise control of the porosity of the ZnO linear resistive element can be achieved without changing the composition of the ZnO linear resistive element and without affecting the performance ofthe ZnO linear resistive element, various needs of heat dissipation, strength and weight reduction can be met, and the prepared ZnO linear resistive element can meet the application requirements of more occasions.

The invention provides a device for preparing porous ceramic and a method for preparing porous ceramic by using polystyrene foam particles, and belongs to the technical field of porous ceramic. The device comprises a foaming cylinder body 1 with a lower opening and a ceramic slurry cylinder body 2 communicating with the foaming cylinder body 1 through a metal net 6, wherein the metal net 6 is arranged at the joint of the foaming cylinder body 1 and the ceramic slurry cylinder body 2, the foaming cylinder body 1 is provided with an upper cover 3, the upper cover 3 is provided with a gas inlet 4, and a pressurizing piston 5 is arranged at a lower opening of the ceramic slurry cylinder body 2. The device is simple in structure, the porous ceramic is prepared by using the polystyrene foam particles as a pore forming agent by using the structure, the cost is low, and the market competitiveness is high; the specific volume of the polystyrene foaming particles is low, and smoke pollution generated in the roasting process is small; and the porosity of the porous ceramic can be accurately controlled by adjusting the compactness of the polystyrene foamed particles and the introduction time of the foaming gas.

The invention discloses a preparation method for a carbon/carbon composite Yb2Si2O7 whisker toughened Yb2SiO5 composite coating.The preparation method comprises the following steps that 1, Yb2SiO5 powder and Yb2Si2O7 whiskers are dispersed in isopropanol to prepare a Yb3+ mixture A with the concentration of 30-45 g/L; 2, the mixture A is subjected to ultrasonic concussion and then stirred to prepare suspension liquid A; 3, elementary substance iodine is added into the suspension liquid A to obtain a mixture B, and the mixture B is subjected to ultrasonic concussion for 30-60 min and then stirred while being heated to prepare suspension liquid B; the suspension liquid B is added into a hydrothermal kettle, a graphite electrode serves as an anode, a conductive substrate serves as a cathode, a carbon/carbon composite sample with an SiC inner coating is clamped to the cathode in the hydrothermal kettle, and the hydrothermal kettle is put into an electromagnetic induction heater for a reaction; 5, after the reaction is over, the carbon/carbon composite sample with the SiC inner coating is taken out and dried, and then the carbon/carbon composite Yb2Si2O7 whisker toughened Yb2SiO5 composite coating is prepared.According to the method, the process equipment is simple, the reaction period is short, cost is low, and the method has broad development prospects.

The invention discloses a porous current collector and a preparation method thereof. The preparation method comprises the following steps: providing a metal substrate; the metal base material is conveyed to an extrusion roller to be extruded, and pricking needles are arranged on the surface of the extrusion roller and used for pricking the metal base material; cleaning the extruded metal base material so as to form a through hole in the metal base material; and carrying out drying treatment on the etched metal base material. The preparation method is simple to operate, the size of the through hole is adjustable, the precision is high, the porosity is adjustable, the cost is low, and the yield is high.

The present invention provides based on PbBr ₂ Micropore-regulated all-inorganic CsPbBr ₃ Perovskite solar cells and their preparation methods and applications, specifically spin-coating quantum dot solutions on conductive film substrates to prepare electron transport layers, and then spin-coating PbBr after heating ₂ solution, annealed to form PbBr ₂ Porous film, followed by multiple spin-coating of CsBr solution to prepare CsPbBr ₃ perovskite thin film. By changing PbBr ₂ Crystallization temperature regulation of PbBr ₂ Porosity in the film to allow rapid diffusion of CsBr to PbBr ₂ Preparation of Large Grain CsPbBr in Thin Films ₃ film. PbBr ₂ The microporous structure of the film is large grain CsPbBr ₃ The growth provides space and reduces the residual compressive stress of the perovskite grains. The all-inorganic CsPbBr provided by the present invention ₃ The largest crystal grain of the film can reach 1.62 microns, and the solar cells assembled from it have good stability and high photoelectric conversion rate, which has important practical and economic value for promoting the industrialization process of perovskite solar cells.