46results about How to "Appropriate porosity" patented technology

The invention relates to a bracket material used for an osseous tissue project, and a preparation method thereof. Firstly, the bracket of a type I collagen is extracted from a small fresh pigskin by a mature extracting technique. Then, the bracket is further expanded in a Tris cushion liquid, the pH of which is equal to 8.8 to obtain a natural porous collagen bracket by the treatments of freezing and drying. The bracket is respectively and repeatedly mineralized in a CaCl2 liquid and in (NH4)2HPO4 liquid or mineralized in simulated body fluid for a long period to lead the weakly crystallized HA to be uniformly settled into the collagen bracket; and then a pigskin collagen-hydroxyapatite ossein is obtained by the treatments of freezing and drying to replace the natural bracket material. The invention not only maintains the natural bracket structure of the collagen in an organism, but also has the advantages of low material cost, simple devices, short period and easy operation. The obtained compound bracket material used for the pigskin collagen-hydroxyapatite osseous tissue project has the characteristics of high intensity, large toughness, non-antigenicity, higher biological activity as well as degradation and releasing control.

The invention discloses a three-dimensional porous cartilage extracellular matrix sponge scaffold made of natural cartilage, which can compound cells further to construct tissue engineered cartilage, and can be used for clinically repairing cartilage defects. In the invention, conditions which can fully perform cell extraction and form a porous scaffold matrix are provided by processing cartilage into cartilage microfilaments, and then the cell extraction and solidification and/or strengthening treatment are performed to obtain the three-dimensional porous cartilage extracellular matrix sponge scaffold which is completely decellurized. The antigenicity and cell components are removed in the natural cartilage, and an extracellular matrix component of the cartilage is retained to obtain the scaffold with appropriate pore diameter and porosity, suitable degradation rate, good biocompatibility and certain biomechanical strength. The scaffold has the advantages of broad material sources, low cost, simple and feasible preparation technology, and good repetitiveness; and the scaffold can be widely applied in the field of tissue engineering and has good clinical application prospect.

This invention discloses a method for synthesizing organic-inorganic bentonite composite. The method comprises: utilizing bentonite as the main material, performing inorganic modification through cation-exchange reaction by using hydroxyl aluminum aqueous solution, torrefying to obtain hydroxyl-containing aluminum-pillared bentonite with high porosity and high specific surface area, and reacting between the hydroxyls and silylation agent to graft silane groups onto aluminum-pillared bentonite and obtain organic-inorganic bentonite composite. The organic-inorganic bentonite composite has both the advantages of inorganic pillared bentonite such as high porosity and high specific surface area, and those of organic bentonite such as high organic carbon content and high hydrophobicity thus can be used to treat organic waste gases and wastewater with a good effect by surface adsorption as well as distribution.

A groundwater remediation method for treating acidic or alkaline groundwater containing divalent and trivalent metal cations includes the step of injecting a slurry or suspension of solid alkaline material into the ground, the slurry or suspension being injected into one or more regions such that the groundwater contacts the solid alkaline material and the divalent and trivalent metal cations react to form a layered double hydroxide (LDH) material.

The invention discloses a method for preparing collagen/bioglass/hyaluronic acid tissue repairing materials, comprising the following steps: combining I-type collagen and bioglass, static layering, filtering, adjusting pH value, adding hyaluronic acid, cross linking, molding, freezing and drying and the like. In the process of preparing the collagen/bioglass/hyaluronic acid tissue repairing materials, the diameter of the collagenous fiber bundle composing the network structure of the tissue repairing materials is increased by adjusting the ratio of the I-type collagen and bioglass and the pH value of the combined solution, and the microstructure of the materials is adjusted, thus achieving the aim of improving mechanical strength thereof. The collagen/bioglass/hyaluronic acid tissue repairing materials prepared by the invention has improvement in mechanical property and degradation performance, can be widely used in medical field, also can be used in tissue engineering scaffolds and bone defects and soft tissue injuries repairing.

The invention relates to a method for preparing microfiber hemostatic collagen sponge. The method comprises the following steps of: aggregating collagen molecules by the charge effect by adjusting pH, temperature and the salt concentration of collagen protein solution, freeze-drying the obtained and assembled collagen, then preparing into the collagen protein sponge, and then carrying out thermal crosslinking to obtain the microfiber hemostatic collagen sponge. The microfiber hemostatic collagen sponge prepared by adopting the method has uniform porous structure, good hydrophilic performance, high mechanical strength and degradation resistance and good hemostatic performance, and the defects that the traditional collagen sponge is easy in degradation, poor in mechanical property, easy in collapse in the application process and difficult in maintenance of the inherent form and the like are solved. The preparation method is simple and feasible, and is stable in process, and the prepared microfiber hemostatic collagen sponge can be widely applied in hemostasis and restoration of wounds of burns, traumas and surgical operation, and has good application prospect.

The invention relates to a preparation method of porous polymer scaffolds used for tissue engineering by means of pore-forming agent bonding and filtering method, comprising two steps: firstly, a mold containing pore-forming agent is positioned in the environment with certain temperature and certain humidity, and the pore-forming agent in the mold then can bond together; secondly, polymer solution is cast into the mold, the pore-forming agent in the mold is filtered out after the solvent volatilizing, and a porous polymer scaffold can be obtained. The invention has the advantages of simple equipment, easy operation, controllable aperture, high porosity, excellent connectivity, and fitness for three-dimension porous cell scaffolds in tissue engineering and other application fields.

An x-ray radiator has an anode that emits x-rays when struck by electrons, a cathode that thermionically emits electrons upon irradiation thereof by a laser beam, a voltage source for application of a high voltage between the anode and the cathode for acceleration of the emitted electrons towards the anode to form an electron beam. A surface of the cathode that can be irradiated by the laser beam is at least partially roughened and/or doped and/or is formed of an intermetallic compound or vitreous carbon.

An electrically conductive cellular ceramic as the carrier of catalyst used for car is prepared from purified titanium oxide or Ti powder, graphite powder and pure Al powder through proportionally mixing, adding organic adhesive, stirring, die pressing, heat treating, igniting and self burning for high temp synthesis.

The invention discloses a method for preparing nitrided ferrovanadium. The method comprises the following steps that (1), a sample fabricated by uniformly mixing and pressing vanadium oxide powder, iron powder and carbon powder is subjected to prereduction through the nitrogen gas in a heating furnace, in the prereduction process, the temperature in the heating furnace is 650 +/-20 DEG C, the nitrogen gas flow is 150-180 L/h, and the heat preservation time of the heating furnace is 3-5 hours; (2), after heat preservation in step (1) is finished, the temperature of the heating furnace is then increased to 1200-1500 DEG C to perform final reduction on the sample, in the final reduction process, the nitrogen gas flow in the heating furnace is 150-180 L/h, and the heat preservation time of theheating furnace is 2-3 hours; (3), after heat preservation in step (2) is finished, the sample is cooled along with the furnace in the atmosphere of the nitrogen gas, and an obtained product is the nitrided ferrovanadium. According to the method, the vanadium oxide powder serves as the raw material, the iron powder serves as the iron source, the carbon powder serves as a reducing agent, the nitrogen gas is introduced into the heating furnace for reaction, and the method has the advantages that the procedure is simple, no vanadium slag is generated, the vanadium utilization rate is high, resources are saved, the environment is protected, and the production cost can be lowered.

The invention discloses a biological patch for tissue damage restoration. The biological patch comprises a biological material substrate layer and a cell substrate layer, wherein the substrate layer is attached onto the substrate layer; and a plurality of parallel grooves are formed in the contact surface of the substrate layer and the cell substrate layer. The substrate layer of the biological patch is simultaneously provided with porous and groove vein structures; the orientation growth and distribution of cells can be regulated and controlled; the cell substrate layer can be well attached onto the substrate layer through the mechanical property of the groove vein structures; and the falling is avoided. A product of the biological patch has the advantages that the structure is stable; the pore diameter, the porosity and the permeability are proper; the normal tissue structure can be simulated; the tissue growth pipeline and cell substrates can be provided; and cells favorable for tissue restoration and regeneration can be carried.

The invention discloses a crystal silicon dioxide/carbon porous composite material and a preparation method thereof. Three-dimensional network-shaped crystal silicon dioxide is evenly distributed on the surfaces of carbon particles, so that the crystal silicon dioxide/carbon porous composite material is formed. The silicon dioxide is tetragonal crystals and belongs to a P41212 space group, a=b=4.973, and c=6.924. The porosity of the crystal silicon dioxide/carbon porous composite material is 40%-80%, the peso-position hole diameter is 100-2000 nm, and the electrical resistivity is 0.10-80 ohmcm. The crystal silicon dioxide/carbon porous composite material comprises, by mass, 30%-90% of silicon dioxide and 10%-70% of carbon materials. The preparation method at least includes the following steps of mixing, forming and sintering. According to the step of mixing, the silicon dioxide particles, the carbon materials and a fluxing agent are evenly mixed, so that a powder-like mixture is obtained. According to the step of forming, the powder-like mixture is formed so that a porous block body can be obtained. According to the step of sintering, the obtained porous block body undergoes high-heat treatment in an inert atmosphere, and after the fluxing agent is removed, the three-dimensional network-shaped crystal silicon dioxide/carbon porous composite material is obtained.

An electrically conductive honeycomb ceramics as the carreir of catalyst for car is prepared from purified titanium oxide powder, or Ti powder or iron oxide powder, B2O3 or graphite powder, and pure aluminium powder through mixing, adding organic adhesive, die pressing, heat treating and high-temp synthesis by self combustion.

The invention belongs to the technical field of spicy strip processing and specifically relates to a processing method for delaying spicy strip ageing. The dosing material contains structuring lipid of which the weight is 12-18% of the wheat weight and 3-7 parts of hydrophobic bletilla polysaccharide. The extruding cooking condition is as follows: the water content of the material is 18-21%, the pore diameter of the adopted front mold is 5-6mm, the width of a threaded slot of a double-end screw rod is 14-17mm, the rotating speed of the screw rod is 120-160 rpm and the temperature of the cylinder is at 140-160 DEG C. Compared with the prior art, the processing method has the advantages that the swelling capacity and the water absorption index of the spicy strip prepared under the condition according to the invention are both reduced, but the influence on the taste of the spicy strip is less, and meanwhile, due to the recombination of starch and protein in the product, the stability of the hydrogen bond between starch and water molecule is enhanced, the starch ageing is delayed, the nanometer gel particle can further increase the water molecule and can separate from the starch and the stability of the product taste can be promoted.

The invention provides a preparation method of a tissue engineering scaffold material. The preparation method comprises the following steps: mixing biocompatible polyester with a non-polar solvent to get a first solution; adding a phase inversion solvent into the first mixed solution to get a second solution; and removing the non-polar solvent and the phase inversion solvent of the second solution in a mold through a liquid-gas phase conversion process or/and a liquid-solid phase conversion process, and drying a solute, thus obtaining the tissue engineering scaffold material. According to the method for preparing the tissue engineering scaffold material, a tissue engineering scaffold has high porosity on the basis of good mechanical properties.

The invention discloses a matrix for cultivating straw biomass charcoal with high ventilating performance, and the process comprises, amounts by weight, 8-12 parts of perlite powder, 4-6 parts of coconut bran, 1-2 parts of large-leaf sophora; 0.5-0.8 parts of peanut seedling; 0.1-0.3 parts of alfalfa, 0.2-0.3 parats of vegetable sponge of luffa fiber, 1-2 parts of dandelion, 1-2 parts of potato stem leaf, 1-2 parts of grape skin slag; 0.1-0.2 parts of EM inocula, 1-2 parts of soybean meal, 0.1-0.2 parts of calcium hydrogen phosphate, 30-50 parts of rice straw, 60-80 parts of corn straw, 0.2-0.3 parts of lauroyl monosodium glutamate, 0.2-0.3 parts of ore oil, 0.2-0.4 parts of alkyl glucosides and 0.1-0.2 parts of rapeseed oil.

A lithium-ion rechargeable battery, comprising a positive electrode capable of absorbing and desorbing lithium ions, a negative electrode capable of absorbing and desorbing lithium ions, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, wherein the negative electrode comprises a negative electrode current collector and a negative electrode material mixture layer carried on the negative electrode current collector, the negative electrode material mixture layer comprises graphite and carbon nano-tubes, and an amount of the carbon nano-tubes in the negative electrode material mixture layer is not smaller than 0.1 part by weight and not larger than 10 parts by weight, per 100 parts by weight of the graphite.

The invention discloses a preparation method of a rubidium-doped inorganic-organic lithium battery composite diaphragm, which mainly comprises the following steps: (1) mixing an inorganic precursor with an ethanol-water mixed solvent and rubidium salt, regulating the pH value to 2-10, testing the Zeta potential to be 0, continuing to add an HCl solution until the Zeta potential is -40 mV, and crystallizing to form a colloidal solution; (2) adding polyacrylic acid into the dispersing solvent to form a viscous solution; (3) pouring the colloidal solution obtained in the step (1) into the viscoussolution obtained in the step (2), and adding a binding agent and a dispersing agent to form double-solution coating slurry; and (4) coating the surface of the porous polyolefin diaphragm with the coating slurry, and drying to obtain the rubidium-doped inorganic-organic lithium battery composite diaphragm. According to the rubidium-doped lithium ion battery composite diaphragm disclosed by the invention, due to the doping of rubidium ions, the space between crystal lattices is enlarged, the lithium ion conduction coefficient of the lithium ion battery diaphragm is facilitated, and the first effect and the cycle performance of lithium ions are further improved.

The invention belongs to the field of biomedical bone tissue engineering, and particularly relates to a shape memory polyurethane bone scaffold prepared by a gas foaming method and application of the shape memory polyurethane bone scaffold. The invention provides the preparation method of the shape memory polyurethane bone scaffold prepared by using the gas foaming method. According to the invention, hydrophilic polyethylene glycol can provide a good environment for the growth and adhesion of cells and tissue, and can quickly swell in a body fluid environment to accelerate the conversion of the material from a temporary shape to a permanent shape; amorphous calcium phosphate and organic calcium salt, namely calcium citrate cooperate with each other, so calcium supply can be continuously provided for a bone repair material; the shape memory polyurethane bone scaffold prepared by the gas foaming method can be processed into a bone scaffold required for treating bone defects and the like; and the scaffold has good shape memory performance, can complete transformation from a temporary shape to a permanent shape at a temperature close to a physiological temperature, and well meets the requirements of minimally-invasive surgery. The invention provides a feasible and effective novel shape memory polyurethane bone scaffold for the field of biomedical bone tissue engineering.