66results about How to "Good shape controllability" patented technology

The invention provides a preparation method of a nickel-cobalt layered bimetallic hydroxide/graphene electrocatalyst, which belongs to the technical field of electrocatalysts. The method disclosed bythe invention comprises the following steps: graphene and cobalt nitrate are uniformly dispersed in a methanol solvent by ultrasonic waves, so that an ultrasonic solution is obtained; the ultrasonic solution is added into a methanol solution of dimethylimidazole, is uniformly mixed and then is enabled to stand, and centrifuging, washing and drying are then carried out, so that a ZIF-67/graphene composite material is obtained; the ZIF-67/graphene composite material and nickel salt are mixed and dissolved in a solvent, refluxing is carried out for reaction, centrifugal separation is then carriedout, obtained precipitate is washed with absolute ethyl alcohol, and drying is carried out to obtain a NiCo LDH/G composite material with a nanoscale morphology. The method disclosed by the inventionovercomes the defects of high requirement on equipment, need for high temperature and high pressure and need for an expensive surfactant existing in conventional synthesis methods, and compared withthe prior art, the preparation method has the advantages of simple process, low cost, easy reaction process control and the like, and is suitable for industrial mass production.

A limited portion of a surface of a glass substrate is removed by application of a laser beam on the limited portion of the glass substrate to thereby produce a glass structure according to the invention. The glass substrate contains at least one element such as titanium, iron, vanadium, bismuth, lead, thallium, tin, cerium, rhodium or cobalt capable of absorbing energy of the laser beam and has a threshold of not larger than 1.0 J/cm² per laser beam pulse in terms of machining energy of the laser beam. When such a glass substrate 21 is used, a glass structure having a through-hole 61 or cavity optional in sectional shape can be formed by irradiation with the laser beam 10.

The invention relates to a magnetic iron-oxide nanoparticle covering method using silicon dioxide and belongs to the technical field of nano material preparation. The magnetic iron-oxide nanoparticle covering method using the silicon dioxide mainly comprises preparing water-soluble magnetic iron-oxide nanoparticles through a known method; adding appropriate surface modifier into water base dispersion liquid to form into stable water base dispersion liquid; adding simple substance metal silica powder into the water base dispersion liquid, heating and stirring, enabling the silica powder to hydrolyze under catalysis of alkaline substance to generate into silicon dioxide to be deposited on surfaces of the magnetic iron-oxide nanoparticles and obtaining the silicon dioxide covered magnetic iron-oxide nanoparticles. The magnetic iron-oxide nanoparticle covering method using the silicon dioxide has the advantages of being simple in preparation technology, green and environmental friendly, easily available in material and low win cost and achieving large-scale industrialized production due to the fact that organic solvent and surface active agent are not required in the preparation process and the covering reaction is performed in water solution; enabling obtained products to be strong in morphology controllability, high in purity degree and particularly suitable for biomedical application; being widely applied to silicon dioxide covering of other nanocrystallines such as quantum dots and precious metal nano particles.

The invention belongs to the technical field of nano material preparing. A sea-urchin-shaped gold nano particle synthesis method comprises the following steps that firstly, a soluble silver source anda soluble gold source are evenly mixed, a weak reducing agent is rapidly added, stirring is conducted for a certain time, and a silver/gold seed with the rough surface is obtained; and secondly, thesilver/gold seed and a certain number of gold sources are mixed, and after stirring is conducted for 20 s, centrifugal separation is conducted, the mixture is scattered into deionized water again, andsea-urchin-shaped gold nano particles are obtained. By means of the method, the sea-urchin-shaped gold nano particles high in yield and adjustable in particle size and surface spine density, length and width can be obtained. The gold nano particles with different spine structures have different ultraviolet-visible absorption spectra, and adjustable red shift of an LSPR peak can be shown. In addition, the gold nano particles, namely the sea-urchin-shaped gold nano particles different in spine structure can have different degrees of enhancing functions on raman signals. The method has good application potentials on surface enhanced raman scattering.

The invention relates to a method for preparing a zinc oxide/epoxy resin composite voltage dependent resistor, and belongs to the technical field of electric materials. The method comprises the following steps: firstly, by taking ZnO as a main raw material, adding a small amount of Bi2O3, MnO2, Sb2O3, Co2O3, SiO2 and Cr2O3 according to a ratio, uniformly mixing, performing spray granulation so as to obtain microspheres, and sintering at high temperature so as to form voltage dependent resistor microspheres; uniformly commixing epoxy resin components A and B and the voltage dependent resistor microspheres according to a certain ratio under certain temperature conditions, and removing bubbles in vacuum; injecting the mixture into a mold with an electrode, standing for a certain period of time under the action of an alternative-current electric field, putting into an oven to heat, and taking out from the mold after being cured. According to the method provided by the invention, stable and effective chain-shaped conductive channels are formed in the microspheres inside the voltage dependent resistor under the action of the electric field by virtue of the small-bridge effect, molds with different electrode shapes can be adopted to form composite voltage dependent resistors of various shapes under a relatively low temperature condition, the use amount of oxides such as zinc oxide can be reduced, and the cost is also lowered.

A plasma processing apparatus includes a processing chamber configured to perform a plasma processing on a sample, a first radio frequency power supply configured to generate a plasma, a sample stage configured to place the sample thereon, a second radio frequency power supply configured to supply a radio frequency power to the sample stage, a mass flow controller configured to supply a gas into the processing chamber, and a control device configured to change the radio frequency power supplied from the first radio frequency power supply or the second radio frequency power supply based on a change of plasma impedance after a first gas is switched to a second gas.

The invention discloses a preparation method of a Mn3O4 self-assembly structure. The method comprises the following steps: adding bivalent manganese salt and sodium acetate to a mixture of polyhydric alcohols and water, and stirring the mixture to obtain a transparent solution; heating the transparent solution to 170-220 DEG C, and preparing the Mn3O4 self-assembly structure by adopting a solvothermal method; and centrifugally separating and washing to obtain the Mn3O4 array- or flower-shaped self-assembly structure after reaction. The Mn3O4 three-dimensional self-assembly structure is synthesized in one step by using the solvothermal method, thus the Mn3O4 self-assembly structure is simple in preparation process, cheap in raw materials, low in production cost, strong in shape controllability and good in repeatability, and has great significance in large-scale industrial production and practical application of the Mn3O4 three-dimensional structure (a rod-like self-assembly array-shaped structure or a self-assembly flower-shaped structure); and the obtained three-dimensional structure is high in yield, can be applied to the field of lithium ion batteries and has a good development prospect.

The invention provides a method for preparing nano-structure aniline-co-pyrrole copolymer microsphere, belongs to the technical field of high polymer materials, and solves the problems of impure obtained polymer, complicated post-processing process, environmental pollution of the used solvent, difficult industrial production and the like in the prior polymerizing method for preparing the nano-structure conductive polymer microsphere produces due to the adding of an extra template or massive additives. The copolymer is prepared by changing medium types of polymerization, selecting aniline or N-ethyl aniline and pyrrole as monomers and implementing a static chemical oxidation polymerization method. The method can prepare copolymer microspheres of between 400 nanometers and 4.4 microns. The method has the characteristics of simple operation, high yield and low cost. The prepared copolymer microspheres have excellent characteristics of nano materials. Furthermore, as an aqueous system, the method, which avoids organic solvent, is a green method for synthesizing the copolymer microspheres. The invention provides a new approach for preparation of the nano-structure polymer microspheres.

The invention relates to silicon dioxide nanofiber/polyimide composite aerogel and a preparation method and application thereof, and solves the technical problems that existing SiO2 aerogel is fragile and poor in flexibility. According to the silicon dioxide nanofiber/polyimide composite aerogel provided by the invention, silicon dioxide nanofibers are interpenetrated and staggered to form a three-dimensional network structure, and effective bonding is formed among the fibers through polyimide crosslinking. The invention also provides a preparation method and application thereof. The invention can be used in the field of thermal insulation materials.

The invention discloses a porous CoAl bimetal hydroxide@carbon fabric composite electrode material and a preparation method thereof. The preparation method comprises the steps of firstly, preparing aCo salt and Al salt mixed solution, and adding urea and ammonium fluoride for stirring and mixing; secondly, immersing the processed carbon fabric into the mixed solution, and obtaining a CoAl hydroxide loaded on the carbon fabric by hydrothermal reaction; and finally, immersing the CoAl hydroxide loaded on the carbon fabric into (0.1-0.3)mol/L of sodium hydroxide solution for normal-temperature immersion and etching to obtain the composite electrode material. The porous CoAl bimetal hydroxide@carbon fabric composite electrode material obtained by the method has favorable specific capacitancevalue and is good in cycle stability, the mechanical strength and the flexibility of the electrode are good, certain development guidance is provided for an intelligent, convenient, light and flexibleelectronic product which is constantly searched in modern science and technology, and the electrode material is one of energy materials with great development in future.

The invention discloses a direct-writing molded SiCw/SiC composite material and a preparation method thereof. The preparation method includes: adding PCS and SiCw into an organic solvent, adding an ester dispersant, and conducting ball milling for certain period of time to obtain a high whisker content, uniform and stable ink with certain viscoelasticity. According to a set procedure, a three-dimensional structure is printed out layer by layer on a substrate, and finally conducting curing and cracking to obtain the SiCw/SiC composite material. The method provided by the invention utilizes thevolatile organic solvent and stable cross-linking agent to realize the stable extrusion of a SiCw/PCS based organic slurry, and overcomes the disadvantages of easy nozzle blockage, poor continuity andunstable slurry in the molding process of previous direct-writing molded ceramic suspensions, especially high whisker content suspensions. The designed slurry has simple and reasonable composition, and strongly controllable rheological properties, and is convenient for large-scale industrial application. At the same time, the three-dimensional periodic structure prepared according to the invention has a wide range of scales, and the high strength and modulus of SiC whisker can be combined to prepare a 3D-SiCw/SiC based composite material with good strength and toughness.

The invention relates to a method for preparing gold crystals from nanometer to micrometer by adopting surface active agent molecule C18N3 as reducing agent and protecting agent. The surface active agent molecule C18N3 is not only adopted as the reducing agent to reduce chloroauric acid and obtain crystal nucleus, but also used as a sort of good protecting agent to facilitate the shape control and the growth of the metal crystals. Compared with the conventional method, the surface active agent molecule C18N3 is adopted in hydrothermal method applied in the invention to prepare the metal crystals, the prepared metal crystals have better shape controllability. By simply adjusting the molar ratio between the surface active agent molecule C18N3 and the chloroauric acid as well as the concentration of chloride in the solution, the metal crystals with different shapes can be prepared, including sphere, decahedron, plane triangle, plane pentagon and plane hexagon and two-dimension sheet shape.

The invention discloses yarn ball-like zinc oxide microspheres and a preparation method thereof. The grain size of the microspheres is 2-9mu m, the microspheres consist of zinc oxide thin sheets, and a part of the microspheres have a large hole in the center. The preparation method comprises the following steps: dissolving zinc salt in water to prepare a solution, then, adding hexamethylenetetramine, stirring at room temperature till the solution is clarified, and then adding tartaric acid and uniformly stirring to obtain a reaction solution; and transferring the solution to a reaction kettle, reacting at 120-180 DEG C to prepare zinc oxide; after reaction, carrying out centrifugal separation and washing to obtain the zinc oxide microspheres. The preparation method of the zinc oxide microspheres disclosed by the invention has the advantages that the needed materials are cheap, the preparation process is simple and convenient to operate, the reaction temperature is low and the reaction time is short. The prepared product is regular in shape, has large specific surface area, strong morphologic controllability, good stability and repeatability and strong operability and practicality and has a potential application value and strong practicality in the field of photocatalytic performance, gas sensitivity and the like.

The invention discloses a graphene coupling flower-ball Ni-Mn bimetal oxide three-dimensional class structure electrode material and a preparation method thereof. The method disclosed by the invention comprises the steps of firstly obtaining graphene sponge (GOS) through freeze drying; carrying out hydrothermal composition on a nickel source, a manganese source and the graphene sponge (GOS); and finally carrying out high-temperature calcination to obtain a graphene coupling flower-ball Ni-Mn bimetal oxide (LGS). The graphene coupling flower-ball Ni-Mn bimetal oxide three-dimensional composite material obtained by a hydrothermal method, a freeze drying method and a high-temperature calcination method is good in thermal stability, high in crystallinity and high in shape and form controllability, and is an ideal energy material.

The invention relates to a preparation method of a rare earth upconversion nanomaterial controlled by a transition metal ion in morphology and belongs to the technical field of nanometer material science. According to the preparation method disclosed by the invention, the rare earth upconversion nanomaterial, namely NaY(Ag)F4:Yb, Er doped with a series of silver ions with different concentrations and gradients is prepared by adopting a solvothermal/hydrothermal method. The result shows that the size, crystal appearance and surface morphology of the prepared rare earth upconversion nanomaterial NaY(Ag)F4:Yb, Er obviously and regularly change along with gradient change of the concentration of the silver ions. Therefore, the morphology change of the rare earth upconversion nanomaterial NaY(Ag)F4:Yb, Er can be controlled by controlling the concentration of the silver ions. The method for controlling the rare earth upconversion nanomaterial has the advantages that one kind of ions is needed, and selected control factors are few; and simplicity and convenience in operation are realized, so the method is a relatively-simple and excellent method for controlling the rare earth upconversion nanomaterial.

The invention discloses a method for improving the dispersibility of insoluble amorphous calcium phosphate, provides a method for dispersing and encapsulating a drug by using the insoluble amorphous calcium phosphate, and belongs to the technical field of biomaterials. According to the method, firstly, amorphous calcium phosphate nanoparticles are prepared by adopting a co-precipitation method, then are added to an aqueous solution of sodium hexametaphosphate, and are subjected to probe ultrasonic treatment to form spherical particles. The preparation method is simple and fast, no surfactant is added, the prepared nanoparticles have a uniform particle size and good dispersion stability and can be stably dispersed at room temperature for one month, the nanoparticles have good pH response and release properties to the drug, the amount of release of the drug under simulated tumor pH environment is higher than the amount of release under normal tissue environment, at the same time, the dugload nanoparticles loaded with curcumin (Cur) show excellent inhibitory ability on A549 cells, the survival rate of cancer cells is significantly decreased, and using as an ideal carrier for chemotherapy drugs can be realized.