119results about How to "Aperture size adjustable" patented technology

The invention relates to technology for preparing an anodized aluminum oxide film, in particular to a method for preparing a pore diameter controllable through hole anodized aluminum oxide film. The method comprises the following steps of: performing anode electrolysis treatment on an anodized aluminum oxide film with an aluminum substrate in mixed solution of perchloric acid and acetone to obtain a pore diameter controllable anodized aluminum oxide film with two open ends in short time (2-300 seconds), wherein the pore diameters at the top end and the bottom end fo the anodized aluminum oxide film are accurately controllable in ranges of between 10 and 100nm and between 5 and 25nm; and putting the aluminum oxide film with the aluminum substrate subjected to stage depressurization-method oxidation into acetone solution of perchloric acid, and applying voltage 5-15V higher than film forming voltage for anode electrolysis treatment to obtain the pore diameter controllable through hole anodized aluminum oxide film. In the method, the pore diameters at the top end and the bottom end of the anodized aluminum oxide film can be respectively controlled, holing and removal of the aluminum substrate are completed by one step, and a plurality of problems of complicated process, time consumption, difficult control of pore diameters and the like in the conventional process for preparing the through hole anodized aluminum oxide film.

The process of preparing carbon nanotube foam includes the following steps: mixing mixed acid treated carbon nanotube and 0.5-6 wt% concentration water solution of gelatin in the ratio of 1 g to 40-150 ml and ultrasonic treating for 10-60 min; adding organic solvent in 2-20 ml into the mixture solution and stirring until form elastomer; pressurizing the elastomer inside a graphite mold at 1-100 MPa for 10-40 min, vacuum drying at 50-200 deg.c for 1-5 hr, maintaining in N2 environment at 200-800 deg.c for 1-5 hr, and cooling to normal temperature to obtain the carbon nanotube foam. Thus produced carbon nanotube foam has no organic polymer adhesive contained, and adjustable porosity and pore size, and may be used in preparing composite material prefab and in producing biological rack material, biological carrier, catalyst carrier, etc.

The invention relates to a fluorenyl windmill grid material and a preparation and application method thereof, and belongs to the field of organic molecular materials and high and new photoelectric technologies. The fluorenyl windmill grid material is cyclic oligomer with fluorenyl micromolecules as monomers, and the specific general structural formula is shown in the description. The material has the advantages that the fluorenyl windmill grid material has both porous characteristics and semiconductor photoelectric characteristics; raw materials are cheap and easy to obtain, reaction conditions are mild, and operation is easy; the fluorenyl windmill grid material has good mechanical properties of a nanomaterial; the fluorenyl windmill grid material has good solubility, and nanofilm processing or fibration processing is facilitated; with a rigid framework, the fluorenyl windmill grid material is high in glass transition temperature, high in thermal stability, electrochemical stability and spectrum stability and the like. Thus, the fluorenyl windmill grid material is expected to become a new-generation practical organic micromolecular photoelectric material and has good application prospects in the fields of organic electronics, spintronics, optoelectronics, mechatronics, nanobiology and the like.

The invention relates to a technique for preparing an anode alumina film, in particular to a method for preparing the anode alumina film which has small aperture, is ultra thin and is controllable in aperture and thickness. In the method, high-pure aluminum is used as an anode, a certain constant-voltage and direct-current power supply is applied onto a sulfuric acid electrolyte to perform anodicoxidation, proper voltages between the cathode and the anode, electrolyte concentration, electrolyte temperature and anode oxidization time are selected, and after the reaction, anode alumina with analuminum substrate is used as an anode and placed in mixed solution of perchloric acid and acetone, anode electrolysis treatment is performed under a voltage which is 5 to 15V higher than an anode oxidization voltage to make an alumina film separate from the aluminum substrate and to remove a baffle layer, and thus, the small-aperture through-hole anode alumina film with controllable aperture andthickness is obtained. When the method is used, the mass, simple, nondestructive, uniform and large-scale preparation of small-aperture and through-hole anode alumina film is realized, and the technical problem that the small-diameter and ultra-thin through hole anode alumina film is not available at present is solved.

The invention relates to an aluminum oxide carrier with a macro-porous structure. The carrier contains auxiliary agent components phosphorus and magnesium, wherein the content of the auxiliary agent components phosphorus and magnesium in the carrier is as follows in percentage by mass: 0.1 weight percent to 2.5 weight percent of P2O5 and 0.1 weight percent and 2.5 weight percent of MgO; the pore diameter distribution is 60nm to 180nm, the macro-pore ratio is 2 percent to 75 percent, the pore capacity is 0.8ml/g to 2.0ml/g and the specific surface area is 250m<2>/g to 300m<2>/g; macro-porous aluminum oxide has the characteristics of adjustable pore diameter size and capability of effectively controlling the macro-pore ratio. The aluminum oxide carrier with the macro-porous structure can be used for the fields including petrochemical industry and fine chemical engineering.

The invention relates to a preparation method and application of a magnetic MOF composite and belongs to the technical field of material preparation. The preparation method comprises the following steps: preparing superparamagnetic ferroferric oxide nanoparticles by adopting a solvent thermal process, taking superparamagnetic ferroferric oxide as a core, coating a silicon dioxide shell on the surface of ferroferric oxide by adopting a hydrolysis method, so that Fe3O4@SiO2 nanoparticles are obtained, dissolving ferric trichloride hexahydrate and terephthalic acid into methylene formamide (DMF) to obtain DMF mixed liquor, then adding the Fe3O4@SiO2 nanoparticles and the DMF mixed liquor into a reaction kettle, and reacting, so that the magnetic MOF composite is obtained. The magnetic MOF composite can be used for adsorption of organic dye methylene blue.

The invention relates to a multilayer structure stent as well as a preparation method and application. The multilayer structure stent comprises a structure from a centimeter scale to a micrometer scale, and is applied to the fields of 3D cell culture, in vitro large-scale amplification, in vitro tissue-like construction, tissue engineering and regenerative medicine, pathological model research, new drug research and development and drug toxicology research. The multilayer structure stent has the characteristics of customized macrostructure, controllable hierarchical structures, adjustable poresize, high porosity and permeability, high cell load, high elasticity modulus, good mechanical properties, good cell functions and nondestructive cell collection.

The invention relates to an MXene-based three-dimensional porous flexible self-supporting membrane, a preparation method thereof and an application of the membrane in electrochemical adsorption of dyes. The preparation method of the self-supporting membrane comprises the following steps that an MXene nanosheet suspension, a polystyrene microsphere suspension and a single-walled carbon nanotube suspension are mixed and stirred to be uniform, an obtained mixed solution is subjected to ultrasonic treatment, then vacuum filtration is conducted, so that an MXene/PS/SWCNTs composite film is obtained, and then, the polystyrene microsphere template is removed, so that the MXene-based three-dimensional porous flexible self-supporting membrane can be obtained. The self-supporting membrane obtained in the invention has a large pore volume and a high specific surface area, and can expose more active sites. The prepared self-supporting membrane is used for removing dye through electrochemical adsorption and has the advantages of being high in removal efficiency, easy to recycle, low in cost, easy to control and the like.

The present invention relates to a first-stage selective hydrogenation catalyst for cracking gasoline, wherein the catalyst comprises an alumina carrier having a macroporous structure and a metal active component palladium supported on the carrier, and the palladium content is 0.2-0.35 wt% based on the total weight of the catalyst. The catalyst of the present invention has advantages of good glue capacity, strong arsenic resistance, strong sulfur resistance, and strong coking inhibition.

The invention relates to the field of rapid detection of food safety and particularly relates to a preparation method and application of an electrochemical sensor based on a cobalt oxide/mesoporous carbon nanocomposite material and application of the electrochemical sensor in fast detection of nitrite content in a food. The preparation method of the electrochemical sensor comprises preparing a nanocomposite material carrying cobalt oxide particles and graphitized mesoporous carbon, and modifying a work electrode of the electrochemical sensor. The electrochemical sensor can detect a standard solution of nitrite, determine the linear relationship between the nitrite concentration and current, determine nitrite in the food and compare the nitrite content in the food and the linear relationship to obtain nitrite content of the food to be detected. The electrochemical sensor can determine nitrite content of a food, is easy to operate, has a fast detection rate and high detection sensitivity and provides a novel detection method for efficient and rapid detection of nitrite content in a food.

The invention relates to a process for preparing biodegradable spherical porous starch foam and a biodegradable spherical porous starch foam administration system for an insoluble medicament. The process adopts an emulsifying-freeze thawing combined solvent displacement method, and comprises the following steps of: performing high-speed stirring or homogenizing treatment (emulsion homogenizing machine) on starch-melted aqueous solution with certain concentration serving as a water phase, methylbenzene/chloroform mixed solution (or other emulsion oil phase) serving as an oil phase and Span80 (or other W/O emulsifying agent) serving as an emulsifying agent to form uniform W/O emulsion, standing the emulsion for certain time at the temperature of 20 DEG C below zero, demixing the emulsion by gelling, dehydrating the layers in turn by adopting balance of aqueous solution of methanol with different concentrations, separating and removing the methylbenzene/chloroform layer by adopting a separating funnel, balancing the solution by using anhydrous ethanol, filtering the solution, and drying the filtrate with vacuum to obtain the biodegradable spherical porous starch foam. The foam material suitable to be used as an insoluble medicament carrier increases the specific surface area and water solubility of the insoluble medicament, and finally improves the bioavailability of the insoluble medicament.

The invention relates to a large-pore-size mesoporous carbon/silicon dioxide loaded gold nano-catalyst and a synthesis method thereof. The catalyst has a face-centered cubic ordered structure, the specific surface area is 200m<2>/g to 700<2>/g, the pore volume is 0.30cm<3>/g to 0.60cm<3>/g, the pore size is 7.0nm to 20nm, and the mass percent of Au is 0.5% to 2.5%. During preparation, the mesoporous carbon/silicon dioxide loaded gold nano-catalyst is synthesized in one step through mixing a macromolecular surfactant, which serves as a template agent, with a gold source, a carbon source and a silicon source and carrying out solvent-induced volatilization self-assembly. Compared with the prior art, the catalyst provided by the invention has the characteristics of high-ordered mesoscopic structure, adjustable pore size (7.0nm to 20nm), relatively small gold nano particle size (3nm to 5nm), adjustable gold content (0.5wt% to 2.5wt%), and the synthesis method is simple, is low in cost and facilitates the implementation of large-scale production, thereby having very good economic application prospect.

The invention discloses a preparation method of MIP (molecular imprinted polymer) magnetic mesoporous silica-based microspheres. According to the method, a ractopamine MIP is constructed by polymerizing surface-initiated atom transfer radicals on magnetic mesoporous silica-based microspheres, sodium citrate modified Fe3O4 magnetofluid is taken as a core, mesoporous silica spheres are prepared through hydrolysis and self-assembly of tetraethyl orthosilicate and octadecyltrimethoxysilane with long carbon chains, and the magnetic mesoporous silica-based microspheres with submicron particle size are obtained; further, the surfaces of prepared magnetic mesoporous silica-based microspheres are modified with an ATRP (atom transfer radical polymerization) initiator, then the modified magnetic mesoporous silica-based microspheres are taken as a reactor, the ractopamine MIP is generated in mesopores through adsorption, and the MIP magnetic mesoporous silica-based microspheres which can be used for separating and enriching trace substances are formed and have higher adsorption capacity and better selection for ractopamine and similar drugs of ractopamine.

The invention relates to a preparation method for a self-supporting porous electrode, and the self-supporting porous electrode. The preparation method comprises the following steps: mixing organic polymer resin, a conductive agent and a carbon-sulfur compound in an organic solvent, scraping the obtained mixture onto a notched substrate, preparing an electrode blank by using an immersion phase inversion method, separating the electrode blank from the substrate, and subjecting the electrode blank to washing and freeze drying so as to prepare the self-supporting porous electrode. The flexible porous electrode is simple and environment-friendly to prepare, controllable in thickness, adjustable in pore size and porosity, wide in application scope, and capable of maximally reducing material waste in shearing and flaking and breaking requirements of traditional flexible self-supporting electrodes on material dimensions (i.e., 1D and 2D).

The invention discloses a generation device for producing mesoporous bubbles. The generation device comprises a liquid inlet pipe (1), a gas inlet pipe (2-3), a gas-liquid mixing component (4-7), a foaming component (8) and a liquid outlet pipe (9-10). The gas-liquid mixing component enables suction of gas to reach the gas-liquid mixing effect through diameter shrinkage; and the foaming componentis formed by a large bubble element and a mesoporous material element, the large bubble element is used for producing relatively large bubbles through direct gas-liquid mixing, dissolved gas mixing, hydraulic mixing and the like and then enabling gas and liquid to produce the mesoporous bubbles after passing through a mesoporous material. The generation device for producing the mesoporous bubblescan be applied to a plurality of fields of full mixing between the gas and the liquid and has a certain popularization and application prospect.

The invention relates to a first-stage selective hydrogenation method for pyrolysis gasoline. The pyrolysis gasoline is C6-C8 fraction, a catalyst comprises an alumina supporter with a macroporous structure and metal active components including nickel and tungsten which are supported on the supporter, wherein the content of nickel oxide is 12wt%-22wt% of total weight of the catalyst, the content of tungsten oxide is 1.5wt%-8wt% of the total weight of the catalyst, and technological conditions of the hydrogenation reaction are shown as follows: the reaction inlet temperature is 60-100 DEG C, the reaction pressure is 2.0-3.5 MPa, a volume ratio of hydrogen to oil is 60-180, and volume space velocity of a liquid is 3.0-5.5 h<-1>. The catalyst is better in colloid tolerance capacity, is arsenic-resistant and sulfur-resistant, has high coking inhibition capacity and is well-adapted to pyrolysis gasoline raw materials with different arsenic content and different sulfur content.

A benzene hydrogenation catalyst and a preparing method thereof are disclosed. The catalyst includes, based on mass of oxides, 90.3-97 wt% of an alumina carrier having a macroporous structure and adopting chitosan as a pore-enlarging agent, 0.2-4.9 wt% of an active component that is platinum oxide and 0.2-4.8 wt% of an active component that is palladium oxide. The macroporous alumina carrier comprises auxiliary components which are tin, lanthanum and potassium. The catalyst has high benzene hydrogenation activity, the rate of loss of precious metal active components is low, and an operation cycle is long.

The invention relates to the technical field of bellows clamping devices, and discloses a bellows clamping device with adjustable aperture size, which includes a fixing seat, and a support rod is fixedly installed on the right end of the fixing seat and on the top of the fixing seat. The left end of the fixed seat is provided with a slide bar on the left side of the support rod, the left side of the fixed seat is provided with a horizontal chute on the top surface of the fixed seat, and the bottom of the horizontal chute is located inside the fixed seat. There are grooves. The bellows clamping device with adjustable aperture size can control the size of the clamping aperture by pushing the movement of the slide bar through the improvement of the clamping device, so that the corrugated pipes with different apertures can be adjusted by the improved clamping device. The pipe is clamped, so that when the tension of the bellows is tested by the clamping device, the size of the aperture can be adjusted for clamping, which meets the various needs of users, and also improves the efficiency of testing the ring stiffness of the bellows.

The invention relates to the technical field of construction engineering test and detection, in particular to a device and method for testing the bond performance between a reinforced bar and concreteunder repeated load. The device comprises a loading frame and a strain sensor mechanism; the loading frame comprises an upper loading plate and a lower loading plate, screw rods, a force transmissionplate, a ball joint assembly and a connecting rod, wherein the four corners of each one of the upper loading plate, lower loading plate and force transmitting plate are provided with screw rod holes,the screw rods penetrate through the screw rod holes respectively and are connected to form the integrated loading frame through fastening nuts cooperatively arranged on the screw rods, the strain sensor mechanism comprises a loading end deformation sensor mechanism, a free end deformation sensor mechanism and a test piece sensor mechanism. The device and method for testing the bond performance between the reinforced bar and the concrete under the repeated load have the advantages that the structure is simple, the installation and detachment of a test piece and the test operation are convenient, the precise control can be achieved, and accurate test data and results can be obtained through the loading control of a multi-function electro-hydraulic servo test machine and an existing data acquisition technology.

The invention discloses a preparation method of a double-layer ceramic filter membrane for separation and refining of traditional Chinese medicine, which comprises the steps of: 1) preparation of thefirst layer of a primary filter ceramic membrane, in which aluminum hydroxide powders and carbon fibers are used as a ceramic pore-forming agent and aluminum oxide as a matrix to perform hot-pressingsintering to obtain a porous ceramic membrane; and 2) preparation of the second layer of a micro-filter ceramic membrane and double layer compounding, in which the aluminum oxide is used as the matrixof the ceramic membrane to spray the pore-forming agent (polyvinyl alcohol) onto a laying layer of the aluminum hydroxide powders for granulating, then the product and the prepared first layer of theprimary filter ceramic membrane are molded by means of hot pressing and compounding, and then the molded product is hot-pressed and sintered to obtain a double-layer ceramic filter membrane. The inventive method may control the porosity and the pore size of porous ceramics with convenient molding, simple technological operation and strong designability of shape. Products prepared by the inventivemethod have uniformly-distributed pores and good separating effect, as well as potential and wide practical values in the separation technical field, in particular in the field of separation and refining for decocted solution of the traditional Chinese medicine.

The invention discloses a porous bracket material used for the biomedicine and a preparation method of the porous bracket material, belonging to the field of biomedical material science engineering. The porous bracket material aims to improve the hydrophily of PHB (Polyhydroxybutyrate), and controllability on the aperture and the distribution of the PHB can be enhanced. The porous bracket material is prepared by taking the PHB and polyethylene glycol the base material and combining a template method and a freeze drying method. The porosity of the bracket made of the porous bracket material is determined by the concentration of an initial solution, and pre-freezing temperature also affects the average porosity and the porosity distribution. The Polyhydroxybutyrate/polyethylene glycol porous bracket material has the advantages of good biocompatibility, adjustable hydrophilic/lyophobic balance and controllable porosity and distribution, can meet requirements of different types of cells, and simultaneously guarantees the mechanical strength of the porous material and the affinity of a biomass (cell). The bracket material is very suitable for the apposition growth of a cartilaginous tissue cell.