48results about How to "Regular and orderly structure" patented technology

The invention discloses a method for preparing a titanium dioxide nanotube array, which comprises the following steps: grinding the surface of a titanium sheet by using abrasive paper, polishing by using chemical polishing solution, and drying for later use; preparing electrolyte, wherein a fluoride is used as a solute, water is used as a solvent and an alcohol additive is added; preparing an electrolytic cell having two electrode systems, wherein a titanium sheet is used as an anode, a platinum sheet is used as a counter electrode, and a layer of TiO2 nanotube array can be formed on the surface of the titanium sheet by electrochemical anodic oxidation; subjecting the anodically oxidized titanium sheet to ultrasonic cleaning in acidic solution and drying; and performing anodic oxidation again by using the titanium sheet as the anode, and thus, forming the TiO2 nanotube array with uniform pipe diameter and flat surface on the surface of the titanium sheet. In the method, the problems of non-uniform tube diameter, uneven nantube surface and irregular array of two-step anodic oxidization are solved, and the titanium dioxide nanotube array with more regular shape is formed.

The invention relates to synthesis of nanometer agglomerated sheet-shaped mordenite. In the prior art, during the synthesis of the conventional nanometer molecular sieve, a plurality of nanometer crystals are easily agglomerated to form spheres and other block-like aggregates due to the high surface energy, such that the diffusion speed is slow and the diffusion channel is not smooth in the actualapplication so as to seriously affect the reaction performance of the nanometer molecular sieve and affect the stability of the nanometer molecular sieve. A purpose of the present invention is to mainly overcome the problem in the prior art. According to the present invention, the nanometer agglomerated sheet-shaped mordenite can be efficiently synthesized by adding a small amount of the oxygen-containing organic solvent through the structure-directing action of the organic templating agent tetraethylammonium cation, wherein the composition and the dissociation equilibrium of the silicon-aluminum gel are controlled through the concentration of the tetraethylammonium radical in the synthesis system; and the nanometer agglomerated sheet-shaped mordenite synthesized through the technical scheme can be used for adsorption separation, catalytic conversion in petrochemical industry, and other fields.

The invention relates to a method for preparing a collagen protein / silica membrane double-layer stent. According to the invention, a collagen sponge with a porous network structure is prepared through different crosslinking methods, and a layer of silica membrane with different thicknesses is coated on the collagen sponge again, then the collagen protein / silica membrane double-layer stent is prepared. The collagen protein / silica membrane double-layer stent obtained in the invention has a good effect in an application of being used as an artificial skin stent material, and two layers of the material have different functions, namely the outer layer of the silica membrane has higher mechanical strength to be capable of supporting and protecting a wound, and a good gas-liquid permeability performance to be capable of effectively preventing fluid loss, and a moderate density performance to be capable of preventing bacterial infections and providing a moister environment for wound repair; the inner layer of the collagen sponge can effectively promote cell proliferation and differentiation, delay wound contraction and accelerate wound healing.

The invention particularly relates to a stainless steel surface nano-pore array film and a preparation method thereof. The technical scheme is that: stainless steel treated by surface pretreatment is used as an anode and is placed in a phosphate buffer solution to perform electrochemical anodic oxidation treatment; the time for the electrochemical anodic oxidation treatment is 0.1-4 h; a nano-pore array film is obtained on the treated stainless steel surface; the voltage for the electrochemical anodic oxidation is 10-80 V, and the temperature for the electrochemical anodic oxidation is -5 to 40 DEG C. The preparation method of the invention is simple, effective, environment-friendly, and low in cost; the stainless steel surface nano-pore array prepared by the method has a structured and ordered structure, a high density, a controllable pore diameter and pore depth, and no other impurity elements intervened, is firmly combined with the substrate, and has strong corrosion resistance andhigh hardness.

The invention discloses a transfer tool with an adjustable protection part. The transfer tool with the adjustable protection part comprises a tray base, a partition plate and screw-nut assemblies. Thetray base comprises supporting columns, a base plate and side plates, wherein the side plates are perpendicular to the base plate and are arranged in parallel; the partition plate is arranged betweentwo opposite side plates, the lower end of the partition plate abuts against the base plate, and the partition plate can move between the two opposite side plates; and strip-shaped holes parallel tothe base plate are formed in the side plates, and the two sides of the partition plate are fixedly connected to the side plates through the screw-nut assemblies. The transfer tool with the adjustableprotection part is simple in structure, convenient to adjust, suitable for product parts of different specifications, high in universality, ordered in structure, easy to transport, and very convenientto maintain in later stage.

The invention relates to a special-form mordenite catalyst and a preparing method thereof. The problem that the catalyst has a low activity and selectivity in an arene transalkylation reaction is mainly solved while the chain form improves the efficient mass transfer performance of a molecular sieve based catalyst. The chain-form mordenite serves as a carrier of the catalyst, and active componentsare selected from at least one of VIB elements, at least one of IIB elements, and at least one metal element in IA. The special-form mordenite catalyst well solves the technical problem and can be applied to industrial production of arene conversion like the arene transalkylation reaction.

The invention provides a magnetic suspension refrigeration compressor, and relates to the technical field of compressors. The magnetic suspension refrigeration compressor comprises a first shell, a stator, a rotor, a magnetic suspension support module, a wiring circuit board, a connecting wire set and a sensor set, wherein the stator is arranged in the first shell and surrounds an electromagneticfield area; the rotor is provided with a permanent magnet part consisting of permanent magnets; the permanent magnet part is positioned in the electromagnetic field area; the magnetic suspension support module comprises a first frame and a second frame; the first frame and the second frame are positioned at two ends of the rotor; the first frame comprises a first wiring part; the second frame comprises a second wiring part; the wiring circuit board is embedded in the first shell, and is electrically connected with the stator and the magnetic suspension support module; the wiring circuit boardis provided with a driving chip; the first wiring part and the second wiring part are electrically connected with the wiring circuit board through the connecting wire set; and the sensor set is used for detecting the position of the rotor and returning data to a driving chip. The magnetic suspension refrigeration compressor can greatly reduce the maintenance time, improves the maintenance efficiency, and reduces the maintenance cost.

The invention discloses a preparation method for a poly(melamine-formaldehyde) polymeric microsphere three-dimensional template material. The preparation method comprises the following steps: uniformly mixing melamine and formaldehyde, in a mol ratio of 1: 10-50, in 100 mL of deionized water, then slowing heating the obtained mixture to 30 to 85 DEG C for prepolymerization for 20 to 60 min; then adding a proper amount of formic acid or acetic acid drop by drop for a precipitation reaction for 40 to 80 min and subjecting a reaction product to centrifugation and washing so as to obtain poly(melamine-formaldehyde) polymeric microspheres; dispersing the microspheres in water so as to obtain an emulsion with a solid-liquid ratio of 0.5-1 g: 100 ml, subjecting the emulsion to natural sedimentation for 5 to 10 d and then carrying out vacuum drying at 35 to 45 DEG C. The polymeric microsphere template material prepared by using the method has the characteristics of uniform particle size, small particle size, large specific surface area, neat and ordered structure, strong adsorptivity, great coacervation effect, strong surface reaction capability, etc.

The invention provides a method for preparing Fe3O4 nanorods in a gradient magnetic field, which comprises the following steps: under the action of a gradient magnetic field, dropwisely adding a solution containing iron ions and ferrous ions into a reactor charged with ammonia gas, and reacting at 80-90 DEG C for 40-50 minutes; separating a black precipitate from the solution; and cooling to room temperature, respectively washing with distilled water and ethanol, and carrying out vacuum drying to obtain the Fe3O4 nanorods. The scanning electron microscope, transmission electron microscope, X-ray diffraction and other analyses indicate that the prepared Fe3O4 nanorods have the advantages of regular and orderly structure, complete crystals and uniform morphology, the diameters are 35-45nm, and the lengths are 300-400nm; the analysis on the magnetic properties of the product at room temperature detects that the magnetic remanence and coercive force of the product can be neglected, the saturation magnetization is 54-86 emu / g, and thus, the product appears superparamagnetism; and the magnetic response analysis illustrates that the Fe3O4 nanorods also have high magnetic response, and such characteristic has great potential application prospects in the fields of drug delivery systems and catalysis.

The invention discloses a carbon film obtained by self assembly of graphene oxide or its derivatives and a preparation method thereof, and relates to a preparation method for a highly ordered carbon film. The objective of the invention is to solve the problems existing in the prior art that the combination between a carbon film and a substrate is poor, the preparation technology is complex, the cost is high, and the thickness of carbon films is difficult to control in the process of preparation. The carbon film provided in the invention uses graphene oxide or its derivatives as the raw material and is obtained through the process of self assembly. The carbon film is prepared by the following steps: dispersing graphene oxide or its derivatives in a solvent so as to obtain a solution, immersing a substrate into the solution and allowing the solution to stand at a constant temperature for assembly, wherein the temperature is in a range of 50 to 100 DEG C. The carbon film prepared in the invention has smooth surfaces, strong bonding force to the substrate and good light transmittance and mechanical properties; the modulus of the carbon film is 80 to 120 GPa, and the hardness is 7 to 9 Gpa; the carbon film is orderly orientated along the surface of the substrate, and the thickness of the carbon film is 10 nm to 2 mu m. The preparation process is controllable and concise and produces products with controllable thickness. The carbon film provided in the invention has broad application prospects in such fields as electrode materials, electronic chips, solar cells and high efficient catalysis.