Patents
Literature

265results about How to "Avoid reunion" patented technology

Graphene oxide-silver compound particle and preparation method thereof

The invention discloses a graphene oxide-silver compound particle and a preparation method thereof. The graphene oxide and silver compound particle is in a core-shell structure; a core is an organic matter or inorganic matter particle; and a shell is the graphene oxide-silver compound particle. The preparation method particularly comprises the following steps of: preparing a water solution containing graphene oxide; preparing a suspension solution of the organic matter or inorganic matter particle; preparing the core-shell structure compound particle covered by graphene oxide on the surface; mixing the core-shell structure compound particle covered by graphene oxide on the surface with a silver nitrate solution; adding a reducing agent to carry out one-step reduction reaction under a nitrogen atmosphere; and naturally cooling a reaction solution to a room temperature, centrifuging, washing and drying to obtain the graphene oxide-silver compound particle. According to the graphene oxide-silver compound particle and the preparation method thereof disclosed by the invention, the performance of the finally-obtained graphene oxide-silver compound particle is very good, the utilization amount of the reducing agent used in a preparation process is less and the production cost is low.
Owner:SHANGHAI INSTITUTE OF TECHNOLOGY

Preparation method for hydrophilia polyvinylidene fluoride hollow fiber membrane

The invention relates to a preparation method for a hydrophilia polyvinylidene fluoride hollow fiber membrane. The preparation method comprises the following steps of: (1) dissolving hydrogen-terminated silicone oil and vinyl-terminated methoxy polyethylene glycol into methylbenzene, adding a Pt (platinum) catalyst, and reacting so as to obtain an amphiphilic polymer; (2) adding a nanometer oxide processed by a silane coupling agent into the methylbenzene, and then adding the amphiphilic polymer and the Pt catalyst so as to react to obtain an amphiphilic polymer grafted nanometer oxide particle; (3) mixing the polyvinylidene fluoride, a composite diluent and the amphiphilic polymer grafted nanometer oxide particle so as to prepare a membrane casting liquid, then extruding the membrane casting liquid through a spinning jet so as to obtain a primary hollow fiber, solidifying through a coagulating bath, stretching and retracting so as to obtain a primary hollow fiber membrane, then extracting, performing soak cleaning, and finally processing through a pore former so as to obtain the hydrophilia polyvinylidene fluoride hollow fiber membrane. The preparation method is simple, the purpose of hydrophilic modification is achieved by mixing modified nanometer oxide particles, and the antifouling property of the membrane is improved finally.
Owner:DONGHUA UNIV

Tetrapod-like zinc oxide/graphene composite material and preparation method thereof

The invention relates to a tetrapod-like zinc oxide/graphene composite material and a preparation method thereof. The composite material is formed by growing a graphene nano sheet on the surface of tetrapod-like zinc oxide and belongs to the fields of novel micro-nano material and material preparation. The method comprises the following steps of step1, preparing reaction precursor liquor containing zinc nitrate or zinc acetate and oxidized graphene, wherein the pH value is 8 to 13; step 2, carrying out hydrothermal reaction of the precursor liquor prepared in step 1 at the temperature of 100 to 200 DEG C to prepare a reaction midbody; and step 3, calcining the midbody obtained in the step 2 in an environment of 200 to 680 DEG C while controlling the heating rate at 3 to 8 DEG C per minute to obtain the tetrapod-like zinc oxide/ graphene composite material. By adopting the tetrapod-like zinc oxide/graphene composite material and the preparation method thereof, the defect of existing tetrapod-like zinc oxide that the catalyzing efficiency is low and the clustering problem of the oxidized graphene in the reduction process can be solved. The tetrapod-like zinc oxide/graphene composite material is expected to be popularized in the fields such as heat conduction, piezoelectricity, voltage-sensitive, wave absorption, sound absorption, vibration absorption, antibiosis, anti-weeds, catalysis and the like.
Owner:BEIJING JIAOTONG UNIV

Method for preparing titanium carbide ceramic powder

The invention provides a method for preparing titanium carbide ceramic powder, which belongs to the field of preparing ceramic powder. A titanium source comprises soluble titanium salt titanium tetrachloride or titanium tetrabromide; a carbon source comprises glucose, sucrose, citric acid and soluble starch; oxidant is nitric acid; fuel is urea; ammonium nitrate is a blending agent; the molar ratio of the titanium source to the carbon source is 1: (4-16); and the mixture ratio of the nitric acid to the urea to the ammonium nitrate according to (n nitric acid+n ammonium nitrate)/(2n urea+n ammonium nitrate) is (1-12):2. The method comprises the steps of dissolving various raw materials in water, heating the raw materials at a temperature between 100 and 600 DEG C, obtaining a precursor after the combustion reaction of a solution, grinding the precursor, pretreating the precursor for 0 to 10 hours at a temperature between 200 and 800 DEG C, subjecting the precursor to carbothermal reduction for 1 to 10 hours in flowing argon atmosphere at a temperature between 800 and 1,800 DEG C, subjecting products to subsequent treatment and obtaining titanium carbide powder. As the titanium source and the carbon source in the precursor are small in particle size, uniform in mixture and good in reaction activity, the method has the advantages of lowering the reaction temperature of carbothermal reduction and improving reaction rate, and can prepare the nanometer non-oxide ceramic powder with good dispersion property.
Owner:UNIV OF SCI & TECH BEIJING

Ultralow-density oil-base drilling fluid and preparation method thereof

The invention relates to an ultralow-density oil-base drilling fluid. The invention is characterized in that the ultralow-density oil-base drilling fluid is prepared from the following raw materials: base oil, a density reducer, a suspension stabilizer, an emulsifier, a tackifier, a fluid loss additive, a flow pattern regulator, an alkalinity regulator and a calcium chloride water solution. The base mixed oil is prepared by the following steps: mixing 3# white oil, 5# white oil and natural gas prepared oil, adding a flash point enhancer while stirring, and standing for 0.5-1 hour; and stirring at low speed at the temperature of 30-40 DEG C, and slowly adding oil-soluble nano fumed silica while stirring, wherein the addition process is controlled at 2-3 hours. The ultralow-density oil-base drilling fluid has the advantages of favorable emulsifying stability, favorable rheological properties, high inhibition property for mud shale, high emulsion-breaking voltage, low filter loss, low density (0.75-0.90 g/cm<3>), and high sand carrying and pressure bearing capacities, is beneficial to cleaning the borehole and enhancing the mechanical drilling speed, solves the problem of severe lost circulation in the low-pressure formation and long-section shatter zone formation, and is especially suitable for low-pressure oil gas pools and depletion water-sensitive formations.
Owner:成都西油华巍科技有限公司 +1

A kind of preparation method of lithium manganate battery material

InactiveCN102259931AAvoid reunionGood crystal shapeManganates/permanganatesSolid phasesManganese oxide
The invention discloses a method for preparing a lithium manganese oxide battery material, which comprises the following steps of: (1) dissolving a manganese source and a doped ion source into water, then adding an alkaline medium to form ion-doped manganese oxide precipitation, filling oxidizing gas into solution, finishing filling until a pH value of the solution reaches 6 to 7 and separating to obtain ion-doped manganese oxide; (2) mixing the ion-doped manganese oxide and aqueous solution of lithium hydroxide and performing a reaction under the hydrothermal condition of 150 to 500 DEG C to obtain the lithium manganese oxide; (3) pouring a mixture of a carbon source and water, a mixture of oxide and water or precursor salt solution of the oxide which is used for cladding into the obtained reaction solution, sufficiently stirring the obtained mixture, collecting the reaction solution and drying to obtain an intermediate product; and (4) in the protective atmosphere, sintering the intermediate product at a temperature of 500 to 800 DEG C to obtain a finished product. The lithium manganese oxide material prepared by the method has uniform particle size and the high and low temperature cycle performance and the high multiplying power discharge performance of the lithium manganese oxide material are both obviously superior to those of a like product synthetized by a conventional high-temperature solid-phase method.
Owner:姚金翰 +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