62results about How to "Good pore connectivity" patented technology

Substantially non-microcracked, porous, cordierite ceramic honeycomb bodies are provided. Although exhibiting moderately high thermal expansion (CTE) between 7×10⁻⁷ to 16×10⁻⁷/° C. (25-800° C.), the honeycomb bodies exhibit relatively high thermal shock parameter (TSP), such as TSR≧525° C. by virtue of a high MOR/E ratio, and/or low E_ratio=E_RT/E_{1000° C.} and well interconnected porosity, as witnessed by a relatively high pore connectivity factor (PCF). A method of manufacturing the honeycomb ceramic structure is also provided.

A diesel particulate filter comprising a plugged, wall-flow honeycomb filter body composed of cordierite and having a plurality of parallel end-plugged cell channels traversing the body from a frontal inlet end to an outlet end thereof, wherein the filter exhibits a CTE (25–800° C.) of less than 13×10⁻⁷/° C., a bulk filter density of less than 0.60 g/cm³, a median pore diameter, d₅₀, of less than 25 micrometers, a porosity and pore size distribution that satisfy the relationship P_m≦3.75, wherein P_m is equal to 10.2474{1/[(d₅₀)²(% porosity/100)]}+0.0366183(d₉₀)−0.00040119(d₉₀)²+0.468815(100/% porosity)²+0.0297715(d₅₀)+1.61639(d₅₀−d₁₀)/d₅₀, wherein d₁₀, and d₉₀ are pore diameters at 10% and 90% of the pore size distribution on a volumetric basis, and d₁₀<d₅₀<d₉₀. A method of making the same is also provided.

The invention provides a medical polyvinyl alcohol sponge and a preparation method. The preparation method comprises the following steps: adding polyvinyl alcohol and starch into distilled water carrying out dissolving at 50 to 95 DEG C under stirring so as to obtain a mixed solution; adding a cross-linking agent, an emulsifier and a foam stabilizer into the mixed solution and carrying out stirring at 20 to 60 DEG C for 2 to 8 h so as to obtain a second mixed solution; adding an acidic catalyst into the second mixed solution and carrying out an acetalation cross-linking reaction at a constant temperature of 20 to 90 DEG C for 30 to 180 min so as to obtain emulsion-like liquid; and completion of the reaction, pouring the emulsion-like liquid into a mold, carrying out heating at 50 to 95 DEG C for curing, carrying out demoulding and washing after cooling, and then carrying out cutting and sterilization so as to obtain the medical polyvinyl alcohol sponge. The medical polyvinyl alcohol sponge prepared in the invention has a through hole structure, uniform pore diameter, good biocompatibility, excellent affinity, high porosity and fast liquid absorption rate, and is applicable to the field of surgical sciences, especially as a sponge consumable for vacuum sealing drainage.

The invention discloses a drilling, cutting, discharging and diversion integrated coal seam physical and chemical combination permeability increase system and method, and belongs to soft coal seam pressure relief permeability increase systems and methods. The system comprises a chemical supply jet flow generation device, a drilling, cutting and discharging integrated device and a water, coal and gas separation device. In the chemical supply jet flow generation device, high-pressure water and chemical reagents are fed into a jet flow mixer to be fully mixed through a high-pressure water pump and a chemical adding pump, so that chemical supply jet flow is formed. The drilling, cutting and discharging integrated device can achieve the integration of drilling, slitting and in-hole slag discharging, and the frequency of the phenomenon that holes are blocked in the slitting process is reduced. The water, coal and gas separation device can completely separate the water, coal slag and gas mixture ejected out in the slitting process, separated gas enters an extraction pipeline, and water enters a water tank after being filtered to be recycled. According to the system, ground stress and gas pressure are relieved through slitting, and physical permeability increase is achieved; under the combined action of physical and chemical permeability increase, the air permeability of a coal seam and the gas extraction effect are remarkably improved.

The invention provides a low-temperature activation efficient ammonia decomposition catalyst and a preparation method thereof, and belongs to the field of ammonia decomposition catalysis. The catalyst is a nickel-containing FER molecular sieve; according to the molecular sieve, a nickel-containing carbon material is taken as a nickel source and a hard template agent, and metal nickel is introduced into the FER molecular sieve in situ; and the content of nickel in the nickel-containing molecular sieve is 0.1-5wt.% in terms of nickel element. the invention also provides a preparation method of the catalyst. The method specifically comprises the following steps of: adding a nickel-containing carbon material, a silicon source, an aluminum source, an organic template agent, inorganic base and a solvent into a reactor according to proportions; continuously stirring the materials to obtain uniform sol, aging the uniform sol; transferring the sol to a hydrothermal reaction kettle for crystallization; performing filtering, washing, drying and roasting on a product which is obtained after the reaction is finished; carrying out hydrogen transformation on an obtained molecular sieve; and finally roasting to obtain the nickel-containing FER molecular sieve. The catalyst disclosed by the invention has the advantages of rich microporous structure, short crystallization time and high catalyst activity and stability; the temperature required by ammonia decomposition is greatly reduced; and the catalyst has huge industrial application potential.

The invention discloses a digital rock core three-dimensional structure reconstruction method using a two-dimensional slice image, and the method comprises the steps: training a parallel single imagegenerative adversarial network model, learning the distribution of two-dimensional images, and reconstructing a rock core structure in a three-dimensional space through combining with a Markov chain Monte Carlo method. The method can reflect anisotropism of the rock, can reliably and effectively restore a real rock core structure for the rock with high heterogeneity, and is good in pore connectivity, higher in calculation speed and wider in application range.

The invention discloses a calcium phosphate bone cement with a hollow through structure, a preparation method and an application thereof, belongs to the technical field of calcium phosphate bone cement, wherein the calcium phosphate bone cement with a hollow through structure comprises a solid phase and a solidifying liquid, the solid phase comprises calcium phosphate powder and a fiber mixture, the fiber mixture is an absorbable fiber and a fibrin fiber, and the diameter of the absorbable fiber is 100-500mum, the length is 0.5 mm-1.5 mm, preferably, that diameter of the absorbable fiber is 200-400mum. The prepared calcium phosphate bone cement can form three-dimensional connected macropores, promote cell adhesion and proliferation, and improve the mechanical strength of the bone cement.

The invention provides a biomass fiber-based three-dimensional porous material and a preparation method thereof. The biomass fiber-based three-dimensional porous material comprises biomass fibers, wherein the biomass fibers are mutually cross-linked and supported to form a three-dimensional network structure. The preparation method of the biomass fiber-based three-dimensional porous material is characterized by comprising the following steps: purifying the biomass raw materials; activating the purified biomass materials; preparing a biological cross-linking agent solution, and dispersing the biomass materials in the solution through an orientation high-speed pulping method to form uniform dispersion liquid of biomass fibers with draw ratio of 10-30000; and molding the dispersion liquid to obtain the biomass fiber-based three-dimensional porous material. The biomass fiber-based three-dimensional porous material has the advantages of being wide in raw material selectivity, free of pollution, simple in preparation process, low in cost and controllable in structure, and having huge application value in the fields of biomedical application, tissue engineering, energy sources, environment protection and aerospace.

The invention discloses a method for regulating the pore structure of a water-soluble polymer tissue engineering scaffold by use of a polyester template. The method comprises the following steps of: adding polylactic acid microspheres or fiber into a water-soluble polymer solution; performing freeze drying; and then removing the template to obtain a porous tissue engineering scaffold. The experimental result shows that: the method can obtain a tissue engineering scaffold with aperture of 100-500 microns, over 90% of porosity and over 700% of swelling degree; the scaffold has the characteristics of controllable aperture, sequential arrangement of holes, good pore connectivity and coexistent big and small pores; the structure with coexistent big and small pores is favorable for inoculating and adhering cells, transporting nutrient substances and discharging metabolic products; and moreover, the research indicates that: the differentiation behavior of the stem cell in the scaffold can be intervened in by adjusting the pore structure of the scaffold.

The invention relates to a method for preparing a buffer layer material of a thin-film solar cell. The method comprises the following steps: mixing organic zinc salts with thio-organic matters, after that, generating an ammonium complex of zinc sulfide by an ammonia aeration reaction; transforming the ammonium complex of the zinc sulfide into a crystal structure by adopting a sedimentation method, and crushing the crystal by an ultrasonic treatment; and finally, in a high pressure sealed reaction, using graphene and an auxiliary agent to modify, and then the buffer layer material of the thin-film solar cell is prepared. Compared with the prior art, the method for preparing the buffer layer material of the thin-film solar cell provided by the invention takes the organic zinc salts and the thio-organic matters as raw materials, which thoroughly solves the problem of cadmium metal pollution; the preparation method is simple, and the process condition is moderate; and besides, the prepared buffer layer material has excellent performance, and the efficiency of the solar thin-film batteries is greatly improved.

The invention relates to a method for improving the permeability of an oil sand reservoir by squeezing saturated CO2 brine. The method comprises the following steps of calculating the overall permeability variable coefficient of a permeability profile, and reasonably selecting conventional water injection, injecting saturated CO2 brine at normal temperature and injecting CO2 saturated brine at high temperature; calculating a permeability improvement coefficient, and drawing a relationship between the initial permeability and the permeability improvement coefficient; reasonably controlling the pressure of the wellhead to gradually and slowly squeeze the saturated CO2 brine into the reservoir; recalculating the overall permeability variation coefficient, and when the overall variation coefficient of the stratum is reduced to be less than 0.5, determining that the transformation succeeds; and if the variable coefficient of the overall permeability of the stratum is still larger than 0.5, injecting CO2 saline water again at high temperature for 24 hours or prolonging the injection time by 2 days. On the premise of not influencing the traditional liquid extrusion expansion effect, the CO2 solution selectively corrodes argillaceous components, the permeability heterogeneity in the borehole direction is weakened while the overall permeability of a reservoir is increased, and therefore it is guaranteed that a steam cavity is evenly expanded in the borehole direction, the crude oil yield is increased, and the crude oil recovery rate is increased.

The invention discloses a preparation method of gentamicin sulphate-loading porous hydroxyapatite/PLGA (poly(DL-lactide-co-glycolide) microspheres. The preparation method comprises the following steps: adding PLGA microspheres in an acetone/alcohol solution, adding a diammonium hydrogen phosphate solution, pouring in a calcium nitrate solution, adjusting pH, ageing, washing, drying, calcining, and grinding to obtain porous hydroxyapatite; placing the porous hydroxyapatite powder in a water solution containing gentamicin sulphate/PEG (polyethylene glycol), and carrying out freeze drying to obtain gentamicin sulphate-loading porous hydroxyapatite; and uniformly mixing the PLGA solution and the gentamicin sulphate-loading porous hydroxyapatite, pouring in a polyvinyl alcohol solution, stirring, washing, and carrying out freeze drying to obtain the gentamicin sulphate-loading porous hydroxyapatite/PLGA (poly(DL-lactide-co-glycolide) microspheres. The gentamicin sulphate-loading porous hydroxyapatite/PLGA (poly(DL-lactide-co-glycolide) microspheres prepared by adopting the preparation method are high in medicine loading rate, small in burst release, good in biocompatibility, simple in preparation process, easily available in raw materials, and low in cost; and industrialization is easily realized.