1457 results about "Pore diameter" patented technology

A silicon-carbon material, a preparation method therefor, a secondary battery, and an electric device. The silicon-carbon material comprises silicon-carbon composite particles; the silicon-carbon composite particles comprise a porous carbon material, nano-silicon grains and a silicon carbide material layer; the porous carbon material is provided with through pores, the nano-silicon grains are located in the through pores, and the silicon carbide material layer is partially located on through pore walls; the grain size of the nano-silicon grains is not smaller than the average pore diameter of the porous carbon material. The silicon-carbon material is used as an active material of a negative electrode sheet, thereby improving the cycle performance of batteries.

The invention discloses a charcoal nano lanthanum material capable of synchronously removing organic phosphorus and inorganic phosphorus, and belongs to the field of environmental functional materials. The adsorbent comprises biochar and nano lanthanum loaded on the biochar, wherein the biochar is bamboo biochar; the nano lanthanum is in a La (OH) 3 form, the particle size of the nano lanthanum is 1-250nm, and the loading capacity of the nano lanthanum is 3-20wt%; the pore diameter of the biochar nano lanthanum material is 1-30nm, and the specific surface area is 100-250m < 2 > / g. Compared with a biochar-loaded nano lanthanum composite material in the prior art, the composite material has the inorganic phosphorus adsorption performance and also has the organic phosphorus adsorption effect, and inorganic phosphorus and organic phosphorus can be synchronously removed. According to the charcoal nano lanthanum material, organic phosphorus is adsorbed and removed by regulating and controlling the defect form of lanthanum, especially organic phosphonate can be hydrolyzed and removed, meanwhile, large pore channels of bamboo charcoal are beneficial to diffusion of macromolecular organic phosphorus to action sites of lanthanum, and the adsorption and hydrolysis effects of lanthanum on the organic phosphorus are further enhanced.

The present application discloses a composite separator, a preparation method therefor and a use thereof. The composite separator comprises a polyolefin separator, an adhesive layer coated on one or both sides of the polyolefin separator, and a cellulose film covering the surface of the adhesive layer, wherein the pore diameter of the cellulose film is greater than that of the polyolefin separator. According to the composite separator, the strength and thermal stability of a traditional separator can be improved, and the requirements of liquid absorption and retention are met, so that the performance and the cycle life of an energy storage device are improved.

The invention discloses a microporous diaphragm for a low-electrical-impedance lithium battery and a preparation method of the microporous diaphragm. The diaphragm comprises: a base film layer, wherein the base film layer is of a microporous structure formed by biaxially stretching polypropylene and / or polyethylene; the surface of the base film layer is coated with the functional coating, and the functional coating contains mixed slurry of inorganic nanoparticles and a binder; the surface modification layer is formed by introducing a hydrophilic electrolyte group on the surface of the functional coating through plasma treatment or chemical grafting. The base membrane layer forms a uniform micropore structure through a two-way stretching process, the functional coating is formed by compounding nano silicon dioxide or aluminum oxide and polyvinylidene fluoride according to a specific proportion, a porous layer with gradient pore diameter is formed, the pore size of the porous layer is smaller than that of the base membrane layer, and efficient permeation of electrolyte is ensured. Electrolyte-philic groups such as sulfonic groups are introduced into the surface modification layer, so that the wettability of the diaphragm to an electrolyte is remarkably improved. During preparation, the base membrane is formed through melt blending, two-way stretching and pore-forming agent extraction, and then the functional layer is constructed through slurry coating and a low-temperature plasma treatment or sulfonation process. The diaphragm combines gradient aperture design, inorganic filler enhancement and surface chemical modification, and realizes low impedance, high thermal stability and excellent mechanical strength.

The invention provides a collagen freeze-dried product and a preparation method thereof, and belongs to the technical field of biology. In the formula design, through the synergistic effect of the arginine (salt) and the surfactant, denaturation and aggregation of the collagen freeze-dried product in the production process and the storage period are inhibited, the stability of the product is improved, and the prepared collagen freeze-dried product is high in activity, purity and safety. In the freeze-drying process, pre-freezing parameters are optimized, and the nucleation effect of ice crystals in the freezing process of the collagen mixed solution is controlled by regulating and controlling parameters such as temperature and vacuum degree in the freeze-drying process, so that the shapes and the sizes of the crystals in the collagen freeze-dried product are more uniform, the drying time is shortened, and the production efficiency is improved. And the collagen freeze-dried product with uniform pore diameter and excellent appearance is obtained, and the uniformity and stability of batch and inter-batch products are improved.

The invention belongs to the technical field of biomedical engineering, and particularly relates to a single-base resolution laminated two-dimensional material nanopore structure, a DNA sequencing device and a DNA sequencing method. The two-dimensional material nanopore structure comprises an insulating layer and conducting layers arranged on the upper side and the lower side of the insulating layer, through nanopores are formed in the insulating layer and the conducting layers, and the pore diameter of the nanopores is 2-5 nm; the insulating layer and the conductive layer are made of two-dimensional materials. The conductive layers on the two sides serve as upper and lower electrodes, and a power supply is connected between the upper and lower electrodes to form a phase conductive path which is provided with a longitudinal current detection element. A plurality of groups of two-dimensional material nanopore structures are stacked, and meanwhile, a plurality of groups of base pair signals are obtained. According to the invention, the advantages of small thickness, high physical strength and the like of the two-dimensional material nanopore are kept by using a few layers of two-dimensional material films, the vibration of the films is reduced by increasing the number of layers and improving the mechanical strength, so that the signal-to-noise ratio is improved, and the spatial resolution of the nanopore sensor is improved by designing the upper electrode and the lower electrode.

The invention discloses a composite separation membrane for enriching < 6 > Li isotope and application. The composite separation membrane comprises a functional membrane and at least one supporting membrane; the functional film comprises a plurality of pore channels penetrating through the first surface and the second surface of the functional film, and the pore channel diameter of each pore channel is 0.4-0.7 nm; a lithium ion trapping functional group or a macrocyclic compound and a derivative thereof are modified at an inlet of the first surface of the pore channel. The strength of the lithium isotope separation effect depends on the diameter of a pore channel of the composite separation membrane and functional groups modified at an inlet, does not change along with the migration time and the lithium ion migration proportion, and has long-term continuous stability.

The invention relates to the technical field of batteries, in particular to a porous composite diaphragm, a preparation method thereof and a secondary battery. The porous composite diaphragm comprises a base membrane, a first coating and a second coating, the first coating and the second coating are oppositely arranged on the two surfaces of the base film; the first coating layer and the second coating layer comprise a copolymer containing a first monomer unit and a second monomer unit; the first monomer unit contains a cyano group on a side chain, and the second monomer unit contains a carbonyl group on a side chain; in the copolymer, the molar ratio of the second monomer unit is 1-20%; the first coating and the second coating comprise skeleton structures and first-class pore structures formed between the skeleton structures, and second-class pore structures are formed on bodies of the skeleton structures; and the average pore diameter of the first-type pore structure is greater than that of the second-type pore structure. According to the porous composite diaphragm, the lithium ion conductivity can be improved while the bonding performance with a pole piece is improved.

The present invention relates to the field of battery materials, and provides a lithium manganate cathode material coated with lithium triborate and a preparation method thereof. The cathode material is a porous lithium manganate / lithium triborate composite electrode material, which includes porous lithium manganate with a highly connected directional columnar pore structure and a lithium triborate coating covering the pore surface, with a mass ratio of (86.0~92.0):(8.0~14.0), a coating thickness of 600~800 nm, a pore diameter of 45~95 μm, and a porosity of 65~78%. The preparation method includes: preparing a precursor colloidal solution by the sol-gel method, obtaining porous lithium manganate through low-temperature freezing molding and freeze-drying, and forming a cathode substrate through pre-oxidation and high-temperature sintering; subsequently, using vacuum-assisted impregnation, ultrasound, and nitrogen pressure to promote the penetration of the lithium triborate precursor solution, and forming a uniform coating layer through gradient drying and annealing treatment. The present invention significantly improves the crystal structure stability of the cathode material, inhibits manganese dissolution, improves the cycle life and rate performance, and has wide application value.

The invention relates to the technical field of electrochemical energy storage devices, in particular to a silicon-carbon negative electrode material, a negative electrode plate, an electrochemical device and an electronic device, and mainly comprises a core material and a coating material, the core material comprises silicon particles, the coating material comprises a porous carbon material doped with indium particles, and the coating material comprises a porous carbon material doped with indium particles. The average pore size of the coating material ranges from 10 nm to 20 nm, and the porosity of the coating material ranges from 35% to 45%. According to the silicon-carbon negative electrode material provided by the invention, the coating material has the effects of buffering and inhibiting silicon volume expansion, so that pulverization of the silicon-carbon negative electrode material is inhibited, and the problem of volume expansion of a battery is solved.

The present invention relates to the technical field of gas treatment, and particularly relates to a multi-stage adsorption recovery method for organic gases by means of biological nano composite activated carbon. The method comprises the following steps: preparing an activated carbon composite, i.e. nFeOOH@AC, of nano-hydroxyl iron modified corn husk and bamboo shoot skin by using an ethanol dispersion method, which composite can be used for the adsorption of organic gases; and introducing a mixed gas containing a target organic matter into a system comprising at least two biological nano composite activated carbon adsorbers, which are connected in series, at a preset flow rate Q (m3 / h), wherein each adsorber is filled with the biological nano composite activated carbon with a density ρ (kg / m3), the specific surface area thereof is S (m2 / g), and the average pore diameter is d (nm), thereby achieving multi-stage adsorption. The beneficial effects comprise: utilizing the high specific surface area and excellent adsorption performance of the biological nano composite activated carbon, and combining the multi-stage adsorption system, such that efficient recovery of organic gases can be achieved, thereby significantly improving the recovery efficiency. Compared with a traditional treatment method, this method is low in energy consumption, extra fuel is not needed, and the adsorption material can be recycled, thereby reducing resource consumption and waste generation, and conforming to the environmentally friendly development concept.

The invention discloses a polytetrafluoroethylene ceramic membrane and a preparation method and application thereof, and the preparation method comprises the following steps: (1) adding polytetrafluoroethylene and a binder into water, and carrying out first mixing to obtain polytetrafluoroethylene slurry; adding a carbon nanotube and a dispersing agent into water, and carrying out secondary mixing, so as to obtain a carbon nanotube dispersion liquid; (2) carrying out third mixing on the carbon nanotube dispersion liquid and the polytetrafluoroethylene slurry to obtain a membrane preparation liquid; and (3) coating the surface of a ceramic support with the membrane preparation liquid, drying, and carrying out microwave sintering. The PTFE / ceramic composite membrane is prepared by microwave sintering, so that the sintering time and the production period are obviously shortened, and the production efficiency and the energy utilization rate of the product are obviously improved; the prepared PTFE / ceramic composite membrane is narrow in pore diameter and uniform in pore diameter distribution, has good hydrophobicity and oil-water separation performance, can effectively intercept 30-200nm nanoparticles, and has excellent anti-pollution capacity and stable separation performance for water-in-oil emulsions with different concentrations.

The invention relates to the technical field of metal materials, and discloses a composite metal material based on micro-nano porous copper powder, which is composed of the following components: a matrix is micro-nano porous copper powder with the particle size of 50-500 nanometers, the porosity is 30-80%, and the pore diameter is 20-200 nanometers; the metal additive comprises 5-20 wt% of aluminum powder and 3-15 wt% of nickel powder; the functional additive comprises 1 to 8 weight percent of titanium powder, 0.5 to 5 weight percent of graphene and 0.3 to 3 weight percent of a carbon nano tube; a nickel-titanium alloy coating with the thickness of 50-500 nanometers is formed on the surface of the micro-nano porous copper powder through electrochemical deposition. Through the graded hole design of the micro-nano porous copper powder, a main hole channel provides a rapid electron transmission path, the powder gap stress is eliminated in the low-temperature pre-pressing stage, and atom diffusion and densification are promoted in the high-temperature and high-pressure stage, so that the resistance can be effectively reduced, the loss of energy in the transmission process is reduced, and the energy transmission efficiency of the whole system is improved.

The invention provides a carbon material, application of the carbon material, a silicon-carbon composite material, a negative electrode and a battery, and particularly relates to the technical field of carbon materials and secondary batteries. The carbon material has the characteristics of a porous structure and graphitization at the same time, and has the following characteristics: i) the N2 adsorption pore volume is 0.4-2.0 cm < 3 > / g; ii) the N2 adsorption average pore size is 1.8 to 5.0 nm; and (iii) partial graphitization is carried out, disordered carbon and graphitized carbon are compounded, a diffraction peak P exists between 2theta = 25-30 degrees in an XRD (X-Ray Diffraction) pattern, and the grain size of P calculated according to a Scherrer formula is 2-40 nm. The invention also provides a silicon-carbon composite material, the silicon-carbon composite material comprises a porous carbon material and silicon nanoparticles, the porous carbon material comprises the carbon material provided by the invention, and the silicon nanoparticles are located in pore channels of the porous carbon material. The silicon-carbon composite material provided by the invention has the advantages of high capacity, high first efficiency and high cycle stability when being applied to the lithium ion secondary battery.

The invention provides a cross-adsorption-temperature industrial organic waste gas adsorbent type selection method and application, two or more model adsorption materials with concentrated pore size distribution are used, and filling type adsorption with high pore volume utilization rate can be formed in pores with a specific size or below due to adsorption of volatile organic compounds (VOCs) on a porous material; and a matching relation equation between the filling type adsorption critical aperture and the adsorption partial pressure and a rule of changing along with the adsorption temperature are explored. According to the method, the partial pressure is normalized relative to the saturated vapor pressure at the respective adsorption temperature, and the parameter saturated vapor pressure related to the adsorption temperature is introduced into an equation as a variable, so that an equation of critical pore diameters suitable for adsorption of VOCs at different temperatures and concentrations is established; and a cross-adsorption-temperature industrial organic waste gas adsorbent type selection method is formed. The method provided by the invention can provide a quantitative reference basis for development of VOCs efficient adsorption materials and technologies suitable for different adsorption temperatures.

The invention relates to the technical field of hygienic product manufacturing, and discloses a sanitary napkin core body based on a nano material, functional particles are accurately positioned through flow field directional regulation and control of fiber three-dimensional orientation distribution, pulsed electric field activation free radical gradient polymerization and supercritical CO2 deposition, a surface micropore compact water locking layer with the aperture of 5-20 microns is constructed, and an inner macropore flow guide layer is formed. The pore diameter is 80-150 microns, and a cross-scale synergistic structure is formed. Self-reconstruction of the fiber is excited by sudden change of the flow field rotating speed, and mutual exclusion limitation of the absorption rate and the liquid retention amount of a traditional homogeneous structure is broken through in combination with diffusion kinetics of a terahertz wave resonance reinforced cross-linking agent; a C-O-Ag chemical anchoring point is established by a plasma bonding technology, and the nano-silver particles are physically confined by a graphene oxide sheet layer, so that the problems of particle agglomeration and ion burst release in a traditional spraying process are solved. The dynamic multi-field synergistic process realizes porosity gradient, oriented arrangement of molecular chains and long-acting residence of functional particles, and provides a core solution with high absorptivity, zero reverse osmosis and long-acting bacteriostasis for hygienic products.

The invention discloses a positive plate with gradient pores, a preparation method of the positive plate, a lithium ion battery and an electric device. The positive plate comprises a plurality of coatings which are symmetrically coated on the two sides of a positive current collector, the porosity in the plurality of coatings is increased layer by layer from the coating close to the side of the current collector, and the average pore size of pores is increased layer by layer. The preparation method comprises the following steps: adding a self-sacrifice pore-forming agent into positive electrode slurry, uniformly mixing, coating a carbon-coated aluminum foil with the slurry, drying and rolling, enabling the self-sacrifice pore-forming agent to occupy a certain space, heating a positive electrode plate at a certain temperature, enabling the self-sacrifice pore-forming agent in the positive electrode plate to be decomposed into CO2 and H2O, forming corresponding pores, and forming the positive electrode plate with the pores. According to the invention, gradient gaps are designed on the electrode plate by utilizing the self-sacrifice pore-forming agent, so that the concentration polarization of the thick electrode is relieved, the reaction uniformity and the material utilization rate are improved, the ion transmission performance of the thick electrode is effectively improved, and the dynamic performance of the battery is further greatly improved.

The invention relates to the technical field of pearl wool composite materials, in particular to a pearl wool composite material based on an ethylene polymer and application of the pearl wool composite material in building heat preservation, the pearl wool composite material comprises the ethylene polymer, pearl wool particles and nano aerogel, the ethylene polymer is a mixture of linear low density polyethylene and metallocene polyethylene in a specific proportion, the pearl wool particles are treated by the silane coupling agent, the particle size is 0.5-2 mm, the porosity of the nano aerogel exceeds 90%, the average pore size is 2-20 nm, the components are proportioned according to specific parts by weight, the performance of the composite material is improved through the synergistic effect, and the composite material can be used in the field of building heat preservation. The composite material disclosed by the invention has the advantages of excellent thermal insulation performance, capability of effectively reducing building energy consumption, good mechanical property, high deformation resistance, long service life, good flame retardant property, capability of guaranteeing building safety, simple preparation process, low cost, wide application, capability of being used for multiple parts of a building, convenience in construction and high comprehensive benefit.

The invention relates to the technical field of porous carbon materials, and discloses a preparation method of phenolic resin-based porous carbon based on synergistic activation of water vapor and carbon dioxide. The key point of the method is to construct a multi-dimensional process of'ZIF-8 (at) Ni-MOF derived bifunctional material pore forming-nitrogen / nickel co-doping + dynamic pressure-double-gas synergistic etching + Ti < 3 > C < 2 > T < x > MXene gradient modification '. The MOF derivative material provides regular initial pore channels and active sites, and precise customization of the pore diameter of 0.7-50 nm is realized by combining dual-gas characteristic complementation and dynamic pressure regulation and control; and MXene modification synchronously improves the conductivity and the interface bonding force. The micropore rate is greater than or equal to 88%, the specific surface area is greater than or equal to 2200m < 2 > / g, the total pore volume is greater than or equal to 1.3 cm < 3 > / g, and the process is free of chemical waste liquid pollution. When the material is applied to a lithium battery silicon-carbon negative electrode, the capacity retention rate after 500 cycles is greater than or equal to 85%, and the industrialization value is high.

The invention provides a cross-adsorption-temperature volatile organic compound adsorption quantity prediction method, and belongs to the technical field of waste gas treatment. According to the method, two or more porous materials with concentrated pore diameters are selected as model adsorption materials, the pore structures of the model adsorption materials and the adsorption isotherm of the model adsorption materials to VOCs are tested, and on the basis that the pressure of the adsorption isotherm is normalized relative to the saturated vapor pressure at the corresponding adsorption temperature, the adsorption isotherm of the model adsorption materials is obtained; and a ternary matching relation equation among the filling type adsorption critical aperture, the relative pressure and the adsorption temperature is obtained. According to the method, on the basis of contribution of filling type adsorption and covering type adsorption to the adsorption capacity, the aperture, the relative pressure and the adsorption temperature serve as variables, coefficients of filling type adsorption and covering type adsorption are introduced, equation coefficients are solved in combination with test data of a model adsorption material, and a VOCs adsorption capacity prediction equation crossing the adsorption temperature is constructed. The equation can be used for predicting the VOCs adsorption quantity and isotherm of an adsorbent with similar surface properties at different adsorption temperatures.

The invention relates to a control method of a foam pipe foaming process in the technical field of production of new material foam pipes, which comprises the following steps: acquiring physical characteristic data of foam raw materials, including viscosity, density and foaming agent content, and establishing a raw material characteristic database; adjusting the phase difference between adjacent vibrators through a phase control algorithm according to density data in the raw material characteristic database, so that ultrasonic energy forms a uniform energy distribution field in the foam raw material; an optical sensor is used for monitoring the dispersion state of the foaming agent in real time, the frequency and power of an ultrasonic vibrator are dynamically adjusted according to the monitoring result, and if it is detected that local foaming is not uniform, power output of the vibrator in the corresponding area is increased; the bubble forming process is captured through a high-speed camera, bubble size distribution is analyzed through an image processing algorithm, and whether the bubble structure reaches preset standards including the average pore size, the pore size distribution range and the pore wall thickness or not is judged.

The invention discloses a field miniature PVC litter decomposition experiment ring which comprises a miniature ring structure, observation opening structures are oppositely formed in the outer surface of the miniature ring structure, a nylon net structure with the pore diameter of 5 mm is glued in an inner cavity of one observation opening structure, a nylon net structure with the pore diameter of 50 microns is glued in the other observation opening structure, and the inner cavity of the other observation opening structure is glued with a nylon net structure with the pore diameter of 50 microns. The top of the outer ring of the miniature ring structure is sleeved with a disassembly and assembly ring, and a cover net structure which is in a stretched state and has the aperture of 50 micrometers is glued to the top of the disassembly and assembly ring. Firstly, the influence of microenvironment interference and physical limitation in the litter decomposition process is solved, and the situation that the decomposition rate deviates from a true value due to litter compaction and rainfall erosion in the environment is avoided; secondly, the problem that a litter mesh bag method changes the feeding preference of soil animals is solved, it is ensured that the decomposition behavior is consistent with the natural state, and finally, due to the fact that the decomposition process is protected by the miniature environment, the influence of human factors and large animals is avoided.

The invention discloses a shallow shale gas self-sealing reservoir formation identification method, which comprises the following steps: firstly, carrying out dual-energy CT scanning on a shale full-diameter core sample to obtain DEI values, and the difference of the DEI values embodies different lithologic (physical property) longitudinal change rules, i.e., different shale lithologic grain interlayer interlayers, different shale lithologic grain interlayer interlayers, different shale lithologic grain interlayer interlayers, different shale lithologic grain interlayer interlayers, different shale lithologic grain interlayer interlayers, and different shale lithologic grain interlayer interlayers; the development of the top and bottom plates of the high-quality shale reservoir enables the shale gas to have a self-sealing reservoir forming characteristic; then simulating the adsorbability of the shale gas through laboratory thermal cracking to obtain a shale gas adsorbability rule, and identifying whether the shale gas has a self-sealing reservoir forming characteristic or not. And finally, measuring the distribution rule of the microscopic porosity and the pore diameter through a scanning electron microscope, judging whether the shale layer is a non-or ultra-low permeability layer under the formation temperature and pressure condition or not, and identifying whether the shale gas has the self-sealing reservoir forming characteristic or not. According to the method, the self-sealing reservoir forming of the shale gas is identified in multiple aspects, and the method provides effective technical support for evaluating the favorable layer section of the shale and is of great significance in improving the exploration and development effect of the shale gas.

A gas separation membrane for separating carbon dioxide includes: a separation layer formed of a polymer material and having a function of selecting and separating carbon dioxide; and a porous substrate including a first porous layer and a second porous layer. The gas separation membrane has a layer thickness T1 of 0.1 μm or more and 10.0 μm or less, an average pore diameter d1 of 10 nm or more and 10,000 nm or less, an aperture ratio A1 of 40% or more and 80% or less, a maximum height roughness R1 of 1 nm or more and 200 nm or less, a layer thickness T2 of 10 μm or more and 1,000 μm or less, a ratio d2 / d1 of an average pore diameter d2 to the average pore diameter d1 of 1.1 or more and 10,000 or less, and a ratio A2 / A1 of an aperture ratio A2 to the aperture ratio A1 of 1.1 or more and 2.0 or less.

The invention relates to the technical field of adsorbents, in particular to a modified mineral-based composite active coke adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps: respectively crushing, sieving and drying an active coke raw material and a modified clay mineral, mixing according to a ratio, adding a binder, fully kneading and uniformly mixing, carrying out compression molding, drying, carbonizing and activating to obtain the modified mineral-based composite active coke adsorbent. The modified clay mineral is prepared by dipping a natural clay mineral in a modifier solution, washing, carrying out suction filtration and drying; and the modifier is one or more of acid, transition metal salt, acidic salt or calcium salt. In the preparation process of the active coke material provided by the invention, the modified clay mineral has the effects of improving the yield of an active coke product, enhancing the adsorption performance of the active coke and improving the pore diameter of the active coke; the modified mineral-based composite active coke adsorbent disclosed by the invention has the characteristics of rich pore structure, large adsorption capacity, high efficiency, rich surface functional groups and the like.

The invention discloses a titanium fibrofelt composite material and a PEM electrolytic tank containing the titanium fibrofelt composite material, and relates to the technical field of PEM electrolytic tanks. The titanium powder mixture is filled in the titanium fibrofelt base material on one side of the second surface of the titanium fibrofelt base material, and the particle size of the first titanium powder, the particle size of the second titanium powder, the mass ratio of the first titanium powder to the second titanium powder, and the porosity and the average pore size of the titanium fibrofelt base material are controlled to be within a proper range; the titanium fibrofelt composite material has the advantages that the titanium fibrofelt base material can be well filled with the titanium powder, and a pore structure with proper pore diameter and pore diameter distribution can be formed in the titanium fibrofelt base material, so that when the titanium fibrofelt composite material is used as an anode gas diffusion layer of a PEM electrolytic tank, the cooperative transmission effect of water and oxygen is good, the mass transfer loss in the operation process of the electrolytic tank is low, and the service life of the electrolytic tank is prolonged. The internal temperature of the electrolytic tank is easy to control.

The invention relates to the technical field of microcosmic measurement, and discloses a morphology construction method, device and equipment of a nanoporous material and a medium, and the method comprises the following steps: obtaining profile data of the nanoporous material; determining a baseline of the profile data based on the profile data; based on the profile data and the base line, pore parameters are obtained, and the pore parameters comprise the pore diameter, the pore depth and the porosity; and based on the pore parameters, constructing the morphology of the nano-pore material. According to the method, the limitation of a traditional measurement method is effectively overcome, the complete three-dimensional shape of the nano-porous material can be constructed, and the method is also suitable for various nano-porous materials including but not limited to porous media such as energy storage materials, catalytic materials, biomedical materials and shale.

The low-pressure reverse osmosis membrane comprises a non-woven fabric base material, a polysulfone porous supporting layer and a polyamide functional layer. According to the low-pressure reverse osmosis membrane, the non-woven fabric base material is adopted for providing basic support, the polysulfone porous supporting layer has proper thickness and pore diameter, and a stable and transparent supporting structure is established for the polyamide functional layer. Nano titanium dioxide particles are introduced into the polyamide functional layer, and the particle size and the content of the nano titanium dioxide particles and the thickness and the surface carboxyl density of the polyamide functional layer are accurately controlled. Nano titanium dioxide particles are uniformly dispersed in a polyamide network, so that the hydrophilicity and surface charge distribution of a separation layer are effectively improved, and the resistance of water molecules passing through the membrane is reduced, thereby realizing high water flux; meanwhile, the structural stability of the polyamide composite layer is enhanced, and the mechanical strength and pollution resistance of the membrane are improved. Charge distribution and hydrophilicity on the surface of the membrane are adjusted by proper carboxyl density, water molecules are promoted to quickly pass through, solutes such as salt are effectively intercepted, and high desalination rate is realized.

To provide porous particles capable of more effectively exhibiting performance of an active component.SOLUTION: A powder of porous tertiary particles, which are composed of aggregates of porous secondary particles is provided, where the average particle diameter of the powder is in the range of 0.1 to 5.0 mm, and in the pore size distribution of the powder, a first peak exists in the range of pore diameters of 5 nm or more and less than 100 nm (PdR1), and a second peak exists in the range of pore diameters of 100 nm or more and 10,000 nm or less (PdR2). When the pore diameter of the first peak is Pd1, the total pore volume (PV1) of pores with diameters of 0.75×Pd1 or more and 1.25×Pd1 or less accounts for 60% or more of the total pore volume of pores with diameters less than 100 nm (PVR1). When the total volume of pores with diameters less than 100 nm is defined as the first total volume (PVR1) and the total volume of pores with diameters of 100 nm or more is defined as the second total volume (PVR2), the value of PVR1 / (PVR1+PVR2) is in the range of 0.2 to 0.6.SELECTED DRAWING: Figure 1

The invention discloses a high-temperature composite phase change heat storage material and a preparation method thereof, and belongs to the technical field of composite phase change heat storage materials. The composite phase change material comprises a matrix and a phase change material, the base body is porous ceramic, and the porous ceramic comprises a lining with a porous structure and a surface layer with a porous structure; compared with the pore diameter of the lining, the pore diameter of the surface layer is smaller; the high-temperature salt in a molten state can enter the inside through small holes in the surface layer; the surface layer can avoid leakage of high-temperature salt in a molten state, and the lining provides a storage and phase change space for the high-temperature salt; the porosity of the lining is larger than that of the surface layer, and the phase change material comprises high-temperature salt.