Patents
Literature

200results about How to "Improve preparation efficiency" patented technology

Method and device for preparing carbon nanotube film

InactiveCN101665247AImprove preparation efficiencyThe reaction equipment is simpleElectrically conductiveTube furnace
The invention relates to a method and a device for preparing a continuous transparent conductive carbon nanotube film. In the device, a water tank is connected with a quartz tube in a tubular furnacevia water seal chemical vapor reaction; a spindle shaft of a spindle film is installed on a seal water surface and rotates driven by a motor; the spindle shaft and the motor can be mounted in a smalltrough or on a bracket of the water surface; the mixed solution of ethanol, ferrocene and thiofuran are injected in a carrier gasflow of H2 with the speed of 200-4000ml/min to react at a high temperature of 900-1600 DEG C; the tubular continuous carbon nanotube film synthesized by reaction is spinned by the spindle shaft, and the spinned carbon nanotube film can be resolved; the size of the carbontube film is correlated to the size of the reactor, and the size of the carbon tube film can be adjusted by adjusting the reaction parameter as for special reactors; and the continuous transparent conductive carbon nanotube film of different structures can be prepared by altering the chemical mixture ratio of the reacted solution. The invention ensures that the continuous transparent conductive carbon nanotube film can be prepared in one step, has high preparation efficiency and simple reaction devices, and is suitable for large-scale production of carbon nanotube films.
Owner:TIANJIN UNIV

Heat conductive composite material with high volume fraction and preparation method thereof

InactiveCN104119627AImprove preparation efficiencyExcellent mechanical properties and thermal conductivityHeat-exchange elementsFlat panel displayHot press
The invention discloses a heat conductive composite material with a high volume fraction. The composite material is characterized by being composed of a heat conductive filling material, which is irregularly stacked to form a heat conductive network and accounts for 90 to 99% of the total weight of the composite material, and a polymer adhesive, which is dispersed in the cavities in the heat conductive network and accounts for 1 to 10% of the total weight of the composite material, wherein the heat conductive filling material is high heat conductive carbon-base micro nano powder. The moulded products can be prepared through the steps of direct mixing and hot press molding, and the preparation efficiency is high. The preparation of the composite material is simple and convenient. Moreover the content of the high heat conductive carbon-base micro nano powder filling material is high, so the composite material can meet the realistic requirements on massive production. The prepared heat conductive composite material has an excellent heat conductive performance and mechanical properties, also has a certain electric conductive performance, and can be used in fields like 3D printing materials, notebook, large power LED luminescence, panel display, digital camera, and mobile communication products and related compact and high-speed electronic elements.
Owner:SOUTHWEAT UNIV OF SCI & TECH

Method for integrating silicon-based lithium niobate thin film electro-optic modulator arrays

ActiveCN110161625AGuarantee functional availability and stabilityImprove preparation efficiencyOptical waveguide light guideNon-linear opticsProcess errorLithium niobate crystal
The object of the present invention is to provide a method for integrating large-scale silicon-based lithium niobate thin film electro-optic modulator arrays in view of the deficiencies of the prior art. By using the method, the preparation process difficulty of the lithium niobate crystal layers is reduced, the precision requirement for the bonding of lithium niobate and silicon is reduced, and the preparation and bonding of the large-scale array-type lithium niobate crystal layers can be simultaneously completed at one time, so that production efficiency of the lithium-based lithium niobatethin film electro-optic modulator arrays is greatly improved; by structurally designing and optimizing the silicon crystal layer, the light can be naturally alternated and mutually transmitted in thesilicon waveguide and the lithium niobate waveguide, so that a high-performance lithium niobate film electro-optic modulation effect is achieved; and in addition, the advantages of standardized silicon-based integration technology maturity are used in the method, and the complex chip preparation process is concentrated on the silicon crystal layer, so that the process error in the chip fabricationprocess can be reduced, and performance stability of the entire silicon-based lithium niobate film electro-optic modulator array is ensured.
Owner:交芯科(上海)智能科技有限公司

Growth method and growth device for bar-shaped sapphire crystals

The invention discloses a growth method and a growth device for bar-shaped sapphire crystals. The growth method comprises the steps as follows: in step one, quantitive high purity sapphire blocks or powder are arranged in a melting pot, and then the melting pot is put in a crystal growing furnace; an edge defined film-fed die is arranged in the melting pot, and the cross section of the guide die is circular; in step two, the crystal growing furnace is vacuumized; in step three, a primary heater controls the temperature of the crystal growing furnace to rise to 2000 to 2100 DEG C so as to melt the sapphire; in step four, seed crystals are added, and seeding is carried out; in step five, crystal growth is carried out until the crystal growth is finished, wherein, the speed ranges from 10 to 100mm/h; in step six, crystal bars are annealed; in step seven, temperature drops slowly, and the speed ranges from 10 to 60 DEG C/h; and in step eight, the crystal bars are taken out after the temperature in the furnace drops to the room temperature. The growth method and the growth device for the bar-shaped sapphire crystals can obtain the bar-shaped sapphire crystals, and can effectively improve the preparation efficiency of the sapphire crystals. The crystals that grow by adopting the growth method, and can be used as substrates for manufacturing LEDs (Light Emitting Diode) and LDs (Laser Diode) after shape processing.
Owner:上海中电振华晶体技术有限公司

Growth method and equipment of sapphire crystal

The invention discloses a growth method and equipment of a sapphire crystal. The growth method comprises the following steps of: step S1, placing a high purity sapphire lump material or powder material of a set weight into a crucible, and then placing the crucible into a crystal growth furnace, wherein a guide die is arranged in the crucible; step S2, vacuumizing the crystal growth furnace; step S3, controlling the temperature rise of the crystal growth furnace to 2,000-2,100 DEG C through a main heater until sapphire is smelted into a fusant; step S4, discharging a seed crystal, and carrying out seeding; step S5, growing the crystal at the speed of 10-100 mm/h until the crystal growth ends; step S6, carrying out annealing treatment on a crystal bar, wherein the annealing temperature is 1,600-2,000 DEG C, and the annealing time is for 10-20 hr; step S7, slowly cooling at the speed of 10-60 DEG C per h; and step S8, cooling the temperature in the furnace to room temperature, and taking out the crystal bar. According to the growth method and equipment of the sapphire crystal provided by the invention, a bar-shaped sapphire crystal can be prepared, and the utilization rate of the sapphire crystal is effectively improved. The crystal which grows by using the method is subjected to forming and processing and can be used, as a substrate, for manufacturing LED (Light Emitting Diode) and LD (Laser Diode) devices.
Owner:上海中电振华晶体技术有限公司

Three-dimensional grid core material woven fabric

The invention discloses a three-dimensional grid core material woven fabric. The three-dimensional grid core material woven fabric is composed of a first face layer fabric, a second face layer fabric and a core layer, wherein the first face layer fabric and the second face layer fabric are woven through weft and warp made of inorganic nonmetallic materials, and the core layer is used for connecting the first face layer fabric and the second face layer fabric. The low-density weft and warp of the first face layer fabric are interwoven in a tabby structure mode, a plurality of pieces of warp in adjacent sections are tied respectively to form stranding warp through wrap-directional filaments in a twisted-woven mode, and therefore the first face layer fabric which is of a continuous mesh grating-shaped structure is formed. Core layer filaments are distributed in a continuous V-shaped structure mode in the warp direction and are continuously and alternately distributed in an I-shaped or V-shaped mode in the weft direction, corresponding warp and weft of the first face layer fabric and the second face layer fabric are vertically connected at intervals, and the three-dimensional grid core material woven fabric is formed. The three-dimensional grid core material woven fabric has the advantages that the structure is advanced and reasonable, when used as core materials for manufacturing light building members, the three-dimensional grid core material woven fabric is good in compatibility for foaming cement or gypsum or other else, pouring is convenient, tamping is easy, and the strength of a produced product is high.
Owner:CHANGZHOU YUECHENG NEW MATERIAL

Preparation method of catalyst for photo-catalytically splitting water to produce hydrogen

The invention discloses a preparation method of a catalyst for photo-catalytically splitting water to produce hydrogen and relates to nano materials. The preparation method includes: placing urea into a ceramic crucible with a cover, and calcining in a muffle furnace to obtain yellow g-C3N4 polymer material; under nitrogen protection, ultrasonically dispersing the g-C3N4 polymer material into tetrahydrofuran solution, using lithium metal as the electron donor and naphthalene as the first electron acceptor, performing solution-phase stripping in the presence of halogenated hydrocarbon, adding ethanol into the reaction product after reaction to remove unreacted lithium metal, centrifuging, washing the obtained solid product, and drying to obtain g-C3N4 nano-plates; ultrasonically dispersing the g-C3N4 nano-plates into water, adding graphene oxide, continuing ultrasonic dispersion to obtain a mixed solution, transferring the mixed solution into a reaction kettle, rising temperature to 140-200 DEG C, keeping the temperature for 2-12 hours, then cooling to room temperature, performing suction filtration to obtain solid product, and performing vacuum drying to obtain the catalyst for photo-catalytically splitting water to produce hydrogen.
Owner:XIAMEN UNIV

System and method for dynamically distributing gases of volatile liquid under room temperature and normal pressure

The invention provides a system and a method for dynamically distributing gases of volatile liquid under room temperature and normal pressure. The system comprises a gas generator, a volatile liquid control device, a gas proportioning device and a gas analysis device, wherein the volatile liquid control device controls air to enter the gas generator; the gas generator converts the volatile liquid into the gases, and introduces the gases into the gas proportioning device; the gas proportioning device is connected with the gas analysis device; and the gas analysis device is connected with the volatile liquid control device by a signal feedback control line. In the system and the method, the volatile liquid control device controls the injection of the air into the gas generator to convert the volatile liquid in the gas generator into the gases, and a conversion speed, a conversion degree, an injection speed and an injection amount all can be effectively and automatically controlled, so the gas distribution efficiency is greatly improved; and simultaneously, a polytetrafluoroethylene layer is coated on the inner side of the gas proportioning device, and gas pipelines adopt polytetrafluoroethylene pipes so as to effectively reduce the absorption of the gases and improve the distribution accuracy.
Owner:北京均方谱元科技有限公司

Polar polymer negative poisson ratio foam material and preparation method thereof

ActiveCN109734955AImprove preparation efficiencyImprove securityFunctional polymersPolymer
The invention relates to a polar polymer negative poisson ratio foam material and a preparation method thereof, and belongs to the technical field of functional polymer foam materials. The method solves the technical problem that a preparation method of a negative poisson ratio foam material is complicated in preparation process, low in preparation efficiency and unfavorable for large-scale production and limits polymers in the prior art. The preparation method is characterized in that polar polymers are directly formed or compounded with auxiliaries and then formed to prepare a workpiece to be foamed, the workpiece to be foamed is placed into a foaming device, physical foaming agents and water are led in, and pressure is rapidly released at the temperature of 80-180 DEG C and under the saturation pressure of 3-25MPa for the saturation pressure of 0.5 hour or more to obtain the foam material. The polar polymer negative poisson ratio foam material can be prepared by one step, the methodis simple in preparation technology, high in preparation efficiency and safety, green, environmentally friendly and suitable for large-scale production, the water is used for assisting in preparation, and the negative poisson ratio foam material with a large size can be prepared.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI

Preparation method of flexible sensor

The invention relates to a preparation method of a flexible sensor. The preparation method comprises the steps of sequentially generating a sacrificial layer and a substrate layer on a base; sputtering a metal layer on the substrate layer; performing first photo-etching and etching processing on the metal layer to form a strain sensor device; coating a photosensitive layer on the strain sensor device and the substrate layer; performing second photo-etching and etching processing on the photosensitive layer to form an optical waveguide; integrating a light source and a photoelectric detector ata position, corresponding to the optical waveguide, on the substrate layer so that the light source, the photoelectric detector and the optical waveguide form the optical sensor device; packaging thesubstrate layer, the strain sensor device and the optical sensor device by use of a packaging layer so that the substrate layer, the strain sensor device, the optical sensor device and the packaginglayer form the flexible sensor; and dissolving the sacrificial layer so that the flexible sensor and the base are separated. According to the reparation method of the flexible sensor, the strain sensor device and the optical sensor device with complicated double-layer structures are molded once through large-range photo-etching, and the preparation efficiency of the flexible sensor is improved.
Owner:TSINGHUA UNIV

Preparation method of carboxylated cellulose nanoparticles

The invention relates to a preparation method of carboxylated cellulose nanoparticles. The preparation method comprises the following steps of soaking a cellulose raw material in a reaction liquid; carrying out hydrothermal reaction for 0.5-6 hours at the temperature of 80-120 DEG C; diluting a reaction product with water; carrying out suction filtration and washing repeatedly until washing liquor is neutral; and carrying out freeze drying to obtain the carboxylated cellulose nanoparticles, wherein the reaction liquid is mixed liquid of an oxidizing substance aqueous solution and a hydrochloric acid aqueous solution, and oxidizing substances are at least one of oxidizing acid and oxidizing salt. The method is simple and convenient in technology, easy to operate, low in cost and short in treatment time; the product is not required to be subjected to troublesome aftertreatment such as dialysis, and the prepared cellulose nanoparticles are high in purity, narrow in size distribution and easy to regulate and control; and the carboxylated cellulose nanoparticles are suitable for industrial large-scale production, and have wide application prospect in the fields of green nano composite materials, biological medicines, food, garments, cosmetics, coating, photoelectricity and the like.
Owner:DONGHUA UNIV

3D printing and electrolytic polishing combined machining system for CoCrMo dental crown

InactiveCN106424733AImprove preparation efficiencyThe surface roughness satisfiesAdditive manufacturing apparatusElectrolysis componentsAlloyMechanical property
The invention discloses a 3D printing and electrolytic polishing combined machining system for a CoCrMo dental crown. The combined machining system comprises laser selective melting printing equipment and electrolytic polishing equipment, wherein the laser selective melting printing equipment comprises an optical transmission system and a vacuum chamber which can be incident by laser of the optical transmission system, a moulding platform which can be lifted is arranged in the vacuum chamber, a powder feeding device used for conveying printing powder is also arranged in the vacuum chamber, the powder feeding device is connected with a power laying device which can lay the printing powder on the powder feeding device onto the moulding platform; the electrolytic polishing equipment comprises an electrolytic tank which is used for placing a product and filled with electrolyte, a para-position electrode is fixed in the electrolytic tank, the para-position electrode is connected with the cathode of a power supply, and when electrolytic polishing is carried out on the product, the product is connected with the anode of the power supply. The combined machining system disclosed by the invention has the advantages that the laser selective melting printing equipment and the electrolytic polishing equipment are combined, surface roughness of the treated product meets post processing requirement, tissues are compact and controllable, mechanical properties can be configured, and anticorrosion and wear-resistant properties are excellent.
Owner:广东汉唐快速制造应用技术研究院有限公司 +1
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products