46 results about "Particle stability" patented technology

The invention discloses water-soluble rare-earth terbium ion-doped cerium fluoride nanocrystallines and a preparation method thereof, and belongs to the technical field of fluorescent nano-crystalline materials and hydrothermal chemical method synthesis thereof. The rare-earth terbium ion-doped cerium fluoride nanocrystallines are rod-shaped or cube-like; and the polyethyleneimine is coated on the surfaces of the nanocrystallines. The preparation method comprises the following steps of: mixing cerium nitrate hexahydrate, terbium chloride hexahydrate, the polyethyleneimine and ethylene glycol in a certain ratio; reacting for 1 to 12 hours in a baking oven at the temperature of 160 to 240 DEG C; cooling a reaction product; washing the reaction product with water and ethanol; and drying in vacuum. The product has very high solubility, adjustable and controllable appearance, high particle stability and high fluorescence quantum yield, and also can be dispersed in different solvents. In the method, raw materials are cheap and easy to obtain; the process is simple; the cost is low; the process repeatability is high; and the nanocrystallines have a potential application value in the field of biomarkers.

The invention relates to the field of coke making with coal pitch, and particularly relates to a method for preparing isotropic coke. The method comprises the steps of polymerization reaction, carbonization reaction and high-temperature calcination, and is characterized in that the quantity and size of small spheres are controlled by adjusting the content of quinoline insolubles in raw materials as well as adjusting the temperature rising speed, the reaction temperature and the constant temperature time of the polymerization reaction and carbonization reaction; the pitch with the quinoline insoluble content of 5-25 percent is obtained through blending by adding pitch substances with the quinoline insoluble of 10-30 weight percent and the toluene insoluble of 25-55 weight percent into soft pitch or medium temperature pitch. Compared with the prior art, the method for preparing isotropic coke has the advantages of no addition of inorganic additives, homogeneous product property and better subsequent performance, and the optical texture of isotropic coke prepared according to the method is in a fine mosaic structure; the isotropic coke prepared according to the method shows a dense and uniform fine mosaic structure from the microscopic view, the macroscopic CTE ratio is near 1, and the particle stability is not less than 90 percent.

The invention discloses a method for fermenting production of a feed enzyme preparation by an immobilized cell technology, wherein the method comprises the following steps: S1, activation and enlargedculture of strains; S2, preparation of immobilized cells; S3, electrification culture of the immobilized cells; S4, fermentation enzyme-production culture; S5, separation and purification of an enzyme preparation; and S6, recycling. The immobilized cell technology is used for immobilizing aspergillus niger, trichoderma koningii, bacillus subtilis and bacillus natto together in carrier granules, and mixed fermentation is carried out to produce the feed enzyme preparation; with mutually beneficial symbiosis among the strains, the variety of produced enzymes is abundant. Compared with a method of single fermentation to produce various enzymes and then compounding, the method can simplify the production process, shorten the production cycle and greatly improve the production efficiency. The prepared immobilized cell particles have the advantages of good stability and easy separation and recovery, can be recycled for enzyme production, greatly reduce production costs, and have good application prospects in the field of feed enzyme preparation production.

The invention discloses an industrial treatment method for oil containing heavy metal wastewater. The industrial treatment method comprises the steps: firstly, removing grease in wastewater; then utilizing a chemical method to remove heavy metal ions in the wastewater; then utilizing a checking pool to check whether the treated wastewater can meet a standard; then discharging the treated wastewater. According to the industrial treatment method disclosed by the invention, small oil drops in the wastewater are agglomerated to increase the diameters of particles or damage particle stability; thus, the grease in the wastewater is removed, the optimal reagent concentration and the reagent use amount are chosen through multiple experiments, resource waste is reduced, and a fluidized bed and a sodium carbonate reagent are utilized to remove the heavy metal ions in the industrial wastewater after the grease is removed; compared with a traditional technology, a treating process is simpler; meanwhile, sludge dewatering equipment is also saved; furthermore, a first water collecting tank, a second water collecting tank and a checking tank are arranged in a perpendicular space, and the floor space of treating equipment is reduced; meanwhile, water flow can sequentially flow into the next technology by relying on the gravity action, and energy consumption caused by needing mechanical equipment transportation is avoided.

The steel slag particle stability measuring process includes the following steps: sieving steel slag particle of certain granularity, stoving, weighing the weight M0, steaming, stoving, sieving out fine powder with granularity smaller than certain size, weighing the residual steel slag M1, and dividing M1 by M0 to obtain the steel slag particle stability R in the said granularity range. The present invention has simple operation, and can analyze steel slag quantitatively for grading steel slag and reasonable utilization.

The invention discloses a driving method of a multicolor electrophoretype electron paper display device with a stable space; electrophoresis particles are arranged in order between two electrodes according to a special driving voltage sequence, located not only on a display electrode, but also on a driving electrode surface, thus effectively improving the electrophoresis particle stability. The driving method can realize the multicolor electrophoretype electron paper storage characteristics without being affected by spatial placement positions, thus effectively reducing the electron paper refresh frequency, and saving energy and power; the driving method can provide power for a large area electron paper, so the electron paper can be easily mounted, thus effectively ensuring watching effect; the driving method can be widely applied in related fields.

The invention discloses a metal nano-particle with stable internal cross-linked micelles, a method for preparing the metal nano-particle and application of the metal nano-particle to catalysis, and belongs to the technical field of catalysts. The internal cross-linked micelles are formed by amphipathic molecules by means of self-assembling, the amphipathic molecules inside the micelles are cross-linked with one another, and hydrophobic ends of the amphipathic molecules contain cross-linkable bonds. The metal nano-particle, the method and the application have the advantages that the amphipathic molecules can be self-assembled in water under hydrophilic and hydrophobic effects to form the micelles, sites can be provided for cross-linking between the amphipathic molecules by the cross-linkable bonds, and accordingly the micelles can be internally cross-linked; the internal cross-linked micelles formed by the amphipathic molecules are used as template synthesis vectors, so that the metal nano-particle can be prepared, the stability of the metal nano-particle can be effectively improved, and catalytic effects of the metal nano-particle can be enhanced.

The invention discloses a preparation method of granular biomass carbon-based fertilizer, the preparation method comprises the following steps: (1) adding neodymium trichloride and dysprosium chlorideinto water, continuing to add sodium oleate powder, after mixing and stirring evenly, performing heat preservation for reaction to prepare an oleic acid rare earth; (2) adding water and a dispersingagent into the oleic acid rare earth, stirring at a high speed to prepare a crop straw modified liquid, then cutting a crop straw into small pieces after washing, putting the straw pieces into the crop straw modified liquid for soaking treatment, performing pyrolysis after taking out the straw pieces to obtain straw biomass carbon; (3) then after mixing straw biomass carbon with a compound fertilizer, continuing to add a binder, and after stirring evenly, putting the mixture into a disc granulator to obtain a granular biomass carbon-based fertilizer. The granular biomass carbon-based fertilizer prepared by the method has good particle stability, so that the effective components in the fertilizer are not easy to be quickly precipitated, and a good sustained release effect can be obtained.

The invention discloses a preparation method of a nano spherical ferrosilicon red pigment with high dispersity and a high encapsulation rate. Fe2O3 with a particle size of 40nm is prepared by virtue of a hydrothermal method, and PVP (polyvinylpyrrolidone) is used for modifying the Fe2O3. The PVP is adsorbed on the surface of the Fe2O3 to form a layer of macromolecular protection membrane and a steric hindrance layer, so that the repelling force and the particle stability can be improved, and the dispersity is improved. Then the surfaces of the Fe2O3 surface particles are uniformly coated witha layer of SiO2 to form Fe2O3@SiO2 having a core-shell structure by adopting a simple St-ber method. By virtue of high-temperature calcinations, the nano spherical ferrosilicon red pigment with high encapsulation rate and high dispersity can be obtained, the synthesized red pigment is pure in color, uniform in particle size and stable in performance, can be used in various glaze bodies and has higher economic value.