93 results about "Porous spheres" patented technology

The invention discloses a Fe2O3 micro-nano porous sphere, a preparation method thereof and uses thereof. The porous sphere is formed by Fe2O3 nanoparticles having a nanometer mesoporous alpha-Fe2O3 phase structure therebetween, wherein the diameter of the sphere is 500-5000nm, the specific surface area of the sphere is 15-25m<2>/g, particle sizes of the particles are 20-60nm, and pore diameters of mesopores are 2-50nm. The method comprises the following steps: mixing ferric chloride hexahydrate, ascorbic acid, urea and water, and uniformly stirring them to obtain a mixed liquid; reacting the mixed liquid under conditions that the temperature is 140-180DEG C and the pressure is a self-generated pressure for at least 4h to obtain an intermediate product; separating, washing and drying the intermediate product to obtain porous iron carbonate; and annealing the porous iron carbonate at 450-550DEG C for at least 4h, and naturally cooling the porous iron carbonate to room temperature to prepare the Fe2O3 micro-nano porous sphere. The Fe2O3 micro-nano porous sphere can be placed in water polluted by organic dyes to photocatalytically degrade under visible light, or in water polluted by potassium dichromate to adsorb.

Process for making thermally stable macro porous spheres with or without central core cavity includes steps of homogenizing dry pulverized selective constituents with or without burnable core particles and with <25% combustibles; sprinkling over pan pelletizer wetted with PVA aqua sol binder and rolling to form spheres having <25% moisture and dry compacting in pelletizer before oven drying at 90-100° C. until moisture and core particles are partially destroyed and sintering under rotary motion of the spheres for 45-60 minutes at 1350-1380° C. before being rapidly cooled down to ambient temperature and sieving and recovering therefrom low-to-high temperatures >90% loose fill macro porous spheres for catalyst and moulded bricks/monoliths forming refractory insulation applications.

The invention discloses a method for continuously preparing cobalt hydroxide with high bulk density. The current cobalt hydroxide preparation methods include an alkali solution sedimentation method, a sedimentation conversion method and the like which have the following three difficulties: cobalt hydroxide sedimentation particles are smaller, difficult to filter and wash, and the recovery rate of materials is low; the materials are low in quality and high in impurity content; the high energy consumption is caused by intermittent production. The technical scheme is as follows: the method is characterized by comprising the following steps of: with cobalt-contained ore material as the raw material, leaching the cobalt-contained ore material, and then, purifying the cobalt-contained ore material to obtain a cobalt chloride solution; with NaOH as a base solution, merging NaOH, cobalt chloride and a complexing agent solution, adding the mixed solution into a reaction kettle, rapidly controlling the pH value at 8-12, the temperature at 30-90 DEG C and the stirring speed at 200-1000rpm in the flow merging process, and opening an overflow valve of the reaction kettle to begin to carry out continuous production after the reaction is carried out for 6-40h. The method is simple in process, capable of realizing continuous production, convenient in operation and beneficial to the industrial production; a product is excellent and is shaped like a porous sphere, and the particle size of the product is distributed normally.

The invention provides a phosphorous-carbon composite material and a preparation method and application thereof. The phosphorus-carbon composite material is prepared from red phosphorus, a carbon material and an additive through simple and high-efficiency mass production at a large scale and is of a porous spherical structure, wherein the red phosphorous is uniformly dispersed in the spherical phosphorous-carbon composite material in a form of nanometer phosphorous. The phosphorous-carbon composite material has the advantages of high first-circle coulombic efficiency, high cycle stability and the like when used for a sodium ion battery. The preparation method of the phosphorous-carbon composite material is simple, is cheap and available in raw materials, is easy for commercial production, and has very wide application prospect.

The invention discloses shape-controlled battery grade iron phosphate and a preparation method thereof. The method comprises the following steps of: (1) preparing reaction mother liquor; (2) dissolving raw materials in the mother liquor to form reaction liquor; (3) carrying out a hydrothermal reaction; and (4) filtering, washing and drying the product. The preparation method disclosed by the invention is simple in technical process and less in control parameters, and iron phosphate with regular shape can be obtained without any plasticizers and dispersants. The filtrate in the step (4) is recovered as the reaction mother liquor which can be repeatedly used, so that the method is saving and environmental-friendly. The iron phosphate prepared by the method is high in purity, wherein the ratio of phosphorus to iron is 1:1. The iron phosphate is formed by iron phosphate particles with regular shapes. The particles are combined by sheet or columnar primary particles in nanoscale. The shapes of the particles after combination are circular sheets, similar spheres, spheres or porous spheres. The monodispersity of the iron phosphate particles is good, and the diameter size is adjusted in the range of 1-50 mu m.

The invention provides a method for preparing porous spherical titanium dioxide and a method for preparing a dye solar cell light positive pole from porous spherical titanium dioxide prepared by the method, and a dye-sensitized solar cell prepared from the dye solar cell light positive pole. The prepared porous spherical titanium dioxide can be used as a dye absorption carrier in the electrode ofa dye-sensitized semiconductor, is large titanium dioxide particles with porous structures, and has the characteristics of P25 and submicron titanium dioxide. In the method, the porous spherical titanium dioxide is prepared by taking cetylamine as a structural guiding agent, and ammonia water as a surface aperture regulator; and the raw materials are easily obtained, the method is easy to operate, the energy consumption is low and the repeatability is high. Compared with a battery prepared from the conventional P25 titanium dioxide, the prepared porous spherical titanium dioxide has a large specific surface area and high photochemical stability, improves the dye absorption efficiency and electron transport efficiency by over 50 percent, and is suitable for the research of high-efficiency dye batteries.

The invention discloses porous spherical titanium dioxide with controllable diameter and preparation and application thereof, belonging to the technical field of titanium dioxide and application thereof. The porous spherical titanium dioxide with controllable diameter is a sphere with diameter of 150nm-4mu m, which is gathered by granule titanium dioxide. The preparation process comprises steps of carrying out reaction on titanium tetrachloride water solution and reaction liquid prepared by urea, polyvinylpyrrolidone and ethyl alcohol, washing, drying and calcining the precipitate so as to obtain the porous spherical titanium dioxide with controllable diameter. The preparation has the advantages of having simple processes, being applicable to industrial production, and realizing control on diameter size of the spherical titanium dioxide by controlling the proportion of raw material amount. The prepared spherical titanium dioxide has large specific surface area, has multiple pores inside, is used for preparing dye sensitization solar energy batteries and endows the dye sensitization solar energy batteries with good photoelectric property.

The invention relates to a flavone-metal complex microsphere which is in a spherical shape and in the structure of a solid sphere or a hollow sphere or a porous sphere, and the particle size of the sphere is 50nm-5000nm. The flavone-metal complex microsphere is formed by complexing flavonoid substances such as flavanol, anthocyanidin, tea polyphenol and the like with metal, and the preparation process comprises the following sequential steps: (1) preparing a flavone solution, (2) reacting and synthesizing, and (3) collecting and drying the product. In the reaction for synthesis, glycerin or glycol is used as an assistant, and the reaction temperature is 60 DEG C-70 DEG C for obtaining the solid microsphere. In the reaction for synthesis, ethyl acetate or vinyl alcohol is used as an assistant, and the reaction temperature is 90 DEG C-150 DEG C for obtaining the hollow microsphere. In the reaction for synthesis, ethanol is used as an assistant, and the reaction temperature is 70 DEG C-90 DEG C for obtaining the porous microsphere. The flavone-metal complex hollow microsphere can be used as a drug carrier or fluorescence molecular carrier for application.

The invention relates to a preparation method of positive-electrode cellular material used by a lithium ion battery, and belongs to the technical field of battery materials. The invention provides a preparation method of used positive-electrode cellular material of ferrous phosphate lithium used by the lithium ion battery, the obtained material has large specific surface area and high porosity, large contact area with electrolyte, improves the deintercalation and intercalation rate of Li+, and is favor of improving the volume and the power density; and the method overcomes the defects that the raw materials can not be fully contacted of methods such as a solid phase method, can obtain the material with controllable grain size, even grain size distribution, with a regular porous sphere or sphere-like shape. The method has simple process, can be continually operated and is easy for industrialization production.

The invention discloses a preparation method for cadmium molybdate porous spheres. The preparation method comprises the following steps of mixing a cadmium chloride solution and a sodium acetate solution to prepare a cadmium acetate precipitate solution, mixing the cadmium acetate precipitate solution and a sodium molybdate solution, loading the mixed solution in a reaction kettle, preserving heat for 2 to 12 hours at 110 to 200 DEG C, performing hydrothermal treatment, repeatedly washing a reaction product by using distilled water after the reaction product is unloaded from the reaction kettle, and filtering and drying the reaction product to obtain the cadmium molybdate porous spheres. The preparation method has the advantages of simple process, no organic surfactants, no pollution, easiness in industrial production, high crystallinity, high purity, capability of effectively controlling the morphology of cadmium molybdate crystals, and the like.

The invention provides an ultraviolet-cured thin film with an adjustable refractive index and a preparation method of the ultraviolet-cured thin film. The preparation method comprises steps as follows: ethyl orthosilicate, deionized water and an organic solvent are mixed and subjected to a reaction for 12-24 h at 8-12 DEG C, an oligomer is prepared and then is aged for 48-72 h at 45-55 DEG C, andSiO2 porous spheres are prepared by self-assembly clustering of the oligomer; (2), silane methacrylate, deionized water and the organic solvent are mixed and subjected to a reaction for 6-8 h at 110-130 DEG C, an oligomer is prepared, a photoinitiator is added, and UV-curable sol is prepared; (3), the SiO2 porous spheres and the UV-curable sol are mixed, and a to-be-cured thin film is prepared; (4), the to-be-cured thin film is irradiated under ultraviolet light, and the ultraviolet-cured thin film with the adjustable refractive index is prepared. The prepared thin film has wider refractive index regulating range and high resistance to laser damage, and high-energy laser output of an intense laser device can be realized.

The invention discloses porous spherical silica chromatography filler and a preparing method thereof. The method includes the steps that 1, absolute ethyl alcohol and a first component are mixed to obtain a mixed solution; 2, a hydrochloric acid water solution is added into the mixed solution and stirred, solvent is removed to obtain a polysiloxane prepolymer; 3, absolute ethyl alcohol and viscosity modifier are prepared into a continuous phase, the polysiloxane prepolymer is dispersed into the continuous phase to obtain an emulsion dispersing system; 4, strong ammonia water is added into the emulsion dispersing system and stirred for reaction, the mixture stands for ageing and is filtered to collect microspheres, and the microspheres are washed and dried to obtain spherical silica microspheres; 5, the spherical silica microspheres are dispersed in deionized water; 6, strong ammonia water is added into the spherical silica microsphere dispersion liquid and stirred, solid is collected, washed, dried and calcined to obtain the porous spherical silica chromatography filler. The filler is in a regular sphere shape and narrow in particle size distribution and can be used in normal-phase chromatography and other separating modes. The preparing method is simple and high in yield, and conditions are easy to control.

The invention relates to a spherical cathode material for a lithium-ion secondary battery and a preparation method of the spherical cathode material. The chemical composition of the spherical cathode material for the lithium-ion secondary battery is LiFe<x>Mn<1-x>PO<4>, x=0-1; the spherical structure is one of a solid sphere, a hollow sphere or a porous sphere; and the diameter is 5nm to 50 microns. The cathode material with a controllable spherical structure for the lithium-ion secondary battery is prepared by carrying out atomizing freeze-drying or atomizing heat-drying on a solution prepared from a lithium compound, an iron compound, a manganese compound, a phosphorus compound, a complexing agent and a carbon source and then carrying out high-temperature pyrolysis reaction. The preparation method provided by the invention can greatly shorten the sintering time of the cathode material for the lithium-ion secondary battery and avoids rapid growth of cathode material crystal for the lithium-ion secondary battery, so that the rapid charge-discharge performance of the cathode material for the lithium-ion secondary battery is improved. The cathode material for the lithium-ion secondary battery with the spherical structure is beneficial to subsequent preparation of a lithium-ion secondary all-battery, is also beneficial to full contact of the cathode material for the lithium-ion secondary battery and an electrolyte, shortens a diffusion path of lithium ions, and can improve the electrochemical properties of the cathode material for the lithium-ion secondary battery.

The invention provides an anion exchange chromatographic filler for purification of low molecular weight heparin. The matrix of the anion exchange chromatographic filler is porous spherical particles of crosslinked poly(glycidyl methacrylate)-ethylene glycol dimethacrylate, the particle size range is 30-150 micrometers, the average particle size is 50-80 micrometers, and the aperture range is 30-180nm. The filled chromatographic column has high dynamic adsorption capacity and good pressure resistant performance, is suitable for use under a high flow rate, and can adapt to the requirements of efficient production. The invention also provides a preparation method of the anion exchange chromatographic filler, the anion exchange chromatographic column filled by the filler, and a method for purifying low molecular weight heparin by the anion exchange chromatographic column.

The invention discloses titania nanotube/nanorod microspheres with a hierarchical structure and a preparation method thereof. The microspheres are porous spheres formed by intertwining titania nanotubes or nanorods, and are obtained by reacting a titania microsphere precursor in alkali solution, dispersing and washing in diluted acid, and annealing at the temperature of between 400 and 500 DEG C. The microspheres have a three-dimensional hierarchical structure and high specific surface area; and the microspheres have higher ultraviolet absorption capability and high catalytic activity under ultraviolet light because of a hierarchical tubular structure.

The invention belongs to the technical field of gas detection, and discloses an indium oxide material for gas detection and a preparation method thereof. The preparation method is characterized in that thiourea and indium chloride tetrahydrate are taken as raw materials, first uniform mixing is performed by magnetic stirring, and a reaction is performed in a teflon reaction kettle for 16 h at 180 DEG C to obtain an indium sulfide material. Compared with indium sulfide and indium sulfide/indium oxide intermediate products, indium oxide has better ethanol sensing performance at 260 DEG C, the linear range is 2 ppm to 100 ppm, and the limit of detection (LOD) is as low as 0.4 ppm. Meanwhile, an indium oxide sensor also has good repeatability and selectivity mainly due to more chemical oxygen and oxygen vacancies on the surface of the indium oxide material. The preparation strategy of a flower-shaped porous sphere sensing material assembled by simple two-dimensional nanosheets can provide convenience for the preparation of other ethanol gas sensors and the preparation of other sensors based on two-dimensional metal oxide semiconductor materials.

The invention relates to a gas fuel porous medium surface combustor suitable for gas fuels. The combustor is of an extension-type structure, and a gas nozzle and an air nozzle are coaxially arranged; a combustor body comprises a porous region I and a porous region II; and the porous region I and the porous region II are respectively provided with a sphere I and a sphere II. According to the invention, gas and air are diffused and mixed in a porous medium, thus the combustor has the advantage of adjustable diffusion degree; combustion is stable, and simultaneously the defects of high tempering possibility in premixed combustion as well as long flames and low combustion intensity in diffusion combustion are overcome; and furthermore, partial flames are stayed in the porous spheres, thus the combustor has an effect of preheating the air and gas, is high in combustion temperature and low in CO emission and simultaneously can be used for combusting gases with lower heat value.

The invention discloses a solid phase preparation method of porous calcium titanate micro-nano particle spheres. The preparation method comprises the following steps: adding tetrabutyl titanate and organic mixed solution into a high pressure reactor, so as to be subjected to thermal reaction; performing suction filtration, sedimentation and washing on obtained products, so as to obtain porous dititanate submicron particle sphere precursors; stirring and mixing porous dititanate submicron particle spheres and calcium carbonate, heating mixture to preset temperature, keeping a preset time quantum at the preset temperature, and performing natural cooling, so as to obtain the porous calcium titanate micro-nano particle spheres with good dispersity. The method is environmental-friendly for production technology, simple in production method, safe, low in cost, and high in yield, and the prepared products have fractional porous sphere shapes, and are good in dispersity and uniform in particle sizes and shapes.

The invention relates to an Fe2O3/Mn2O3 hollow porous sphere electrode material, preparation and application thereof. The preparation method includes the steps of: 1) dissolving ferric nitrate, manganese acetate and oxalic acid in DMF, and stirring the substances evenly to obtain a mixed solution; 2) subjecting the mixed solution to hydrothermal reaction and then taking it out; 3) performing cooling to room temperature, washing the obtained precipitate several times, and then conducting drying to obtain precursor powder; and 4) finally sintering the precursor powder in air atmosphere, thus obtaining the hollow porous sphere electrode material. According to the invention, one-step hydrothermal method is employed to produce the electrode material with 20-100nm holes, the contact area of the electrode material and an electrolyte solution is increased, the diffusion distance of ions and electrons is shortened, the material can have enough free space to adapt to the volume change of electrode material, thus improving the cyclic stability of the material. As a lithium ion battery negative active material, the hollow porous sphere electrode material provided by the invention shows the characteristics of high capacity, good rate capability and good cycle stability.

The invention discloses a preparation of repaglinide chitosan sustained and controlled release microspheres and a preparation method thereof. The core-shell microsphere preparation is formed in the capsule material formed by condensation and cross-linking of polysaccharides. The preparation has slow and controlled release of drugs, and significantly improves the stability of repaglinide. The capsule material prepared by natural cross-linking agent and chitosan has good biocompatibility without any cytotoxicity, and can promote the absorption of drugs , improve the bioavailability of the drug. The invention is used for preparing repaglinide chitosan sustained and controlled release microspheres, and the medicine in dosage form is mainly used for preventing and treating type Ⅱ diabetes mellitus with high blood sugar.

The invention discloses an artificial islet or artificial pancreas and a preparation method thereof. The artificial islet or artificial pancreas includes a supporting body with a porous structure andcells capable of secreting insulin and growing in the porous structure of the supporting body. The preparation method of the artificial islet or artificial pancreas comprises the steps that a PLGA porous sphere supporting body is prepared; the cells capable of secreting the insulin are planted in the PLGA porous sphere supporting body, and the cells planted in the PLGA porous sphere supporting body are detected. The construction of the artificial islet or artificial pancreas is based on the porous structure of PLGA or a polylactic acid polymer sphere and the good biodegradability and biocompatibility thereof, and effectively simulating the structure and physiological function of an islet is facilitated. The insulin secretory cells are set in the constructed artificial islet or artificial pancreas porous sphere, the cell morphology is good, the overall morphology and size are similar to normal mouse islets, and an effective solution is provided for solving the shortage of donors in clinical islet transplantation.

The invention relates to the technical field of nano materials, and discloses a preparation method of nano-scale cobaltosic oxide, which comprises the following steps: preparing porous spherical micron-scale cobaltosic oxide particles by hydrothermal method-high temperature calcination, the cobaltosic oxide being composed of many nano ions, and being fragile in structure and liable to break; crushing the micron-scale cobaltosic oxide into nano-particles through a ball milling method. The conditions such as a ball milling solvent, the diameter of balls and the rotating speed are strictly controlled, so that agglomeration of the nano-particles can be effectively avoided, and the average particle size of the cobaltosic oxide is reduced to 100 nanometers or above; the method is simple in process and beneficial to industrial production.