1020results about How to "The size is easy to control" patented technology

The invention provides an organic hydrophobic modified cobalt-based fischer-tropsch synthesis catalyst. The catalyst consists of the following components in percentage by weight: 5.0 to 30.0 percent of cobalt serving as an active component, 50 to 80 percent of carrier, 5 to 20 percent of silicon dioxide and 5 to 40 percent of hydrophobic groups. The catalyst has the advantages of simple preparation process and high selectivity of middle distillate oil.

The invention relates to the technical field of flat panel display, and provides a backlight module and a liquid crystal display device. The backlight module comprises a light source module, an optical panel and an optical module, wherein the light source module can emit blue light, the optical module is arranged above the optical panel, and the optical panel is provided with a ZnSe: Mn quantum dot nano material which can be excited to produce white light by the blue light. In the invention, a blue-light LED (light-emitting diode) is adopted for exciting the ZnSe: Mn quantum dot nano material, and compared with the existing fluorescent powder, the quantum dot nano material has various advantages such as controllable particle size, uniform dispersion, high and stable excited conversion efficiency, and high lighting effect; and a chip and an exciting material are separated, so that the temperatures of the two are effectively reduced, and the heat dissipation problem of LED driving is solved.

The invention discloses a degradable open porous magnesium and magnesium alloy biomaterial and a preparation method thereof. The magnesium and magnesium alloy biomaterial is in a completely open structure, the hole shape and size are controllable, holes are communicated by virtue of communicating holes, and the number and size of the communicating holes in hole walls are controllable; the holes are uniformly distributed and the porosity is adjustable. The preparation method comprises the following steps: sintering sodium chloride crystal particles to obtain an open porous sodium chloride prefabricated structure; pouring molten magnesium or magnesium alloy into a mould cavity with a sodium chloride prefabricated body, and performing seepage pressure casting; and removing magnesium or magnesium alloy block outer skin with the sodium chloride prefabricated body, washing with alkali, and filtering to remove sodium chloride to obtain the degradable open porous magnesium and magnesium alloy biomaterial. The preparation process is simple, convenient to perform and pollution-free; the prepared open porous structure is provided with the communicated and uniformly distributed holes, is controllable in hole shape and size, relatively high in porosity and strength, free of pore former residues and pore closing phenomenon and adjustable in degradation rate, and can serve as a new-generation degradable bone tissue engineering scaffold.

The invention discloses a method for preparing a graphene-loaded platinum nano catalyst, which comprises the following steps of: (1) preparing graphene (GNS); (2) preparing polydiallyl dimethyl ammonium chloride (PDDA) functional graphene; and (3) preparing the graphene-loaded platinum nano (Pt / GNS) catalyst. The method has the advantages of uniformly adsorbing and distributing PtCl6<2-> with negative charge on the surface of the GNS through electrostatic adhesion by using positive charge uniformly distributed on the surface of the PDDA-modified GNS, solving the technical problem that metallic particles per se aggregate, realizing higher loading rate of PtNPs and having uniform grain size and controllable size.

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 discloses a multi-arm star-type polymer and a preparation method thereof. The method synthesizes the multi-arm star-type polymer by a method with the following two steps of step one: taking a complex formed by a polydentate nitrogen-contained compound and a transitional metal halide as a catalytic system so as to catalyze the polymerization of atom transfer free radicals and self-condensing vinyl of a monomer, thus preparing and obtaining the halogen atom-contained hyperbranched polystyrene macromolecular initiator taken as the star-type polymer core; and step two: taking the complex formed by the the polydentate nitrogen-contained compound and the transitional metal halide as the catalytic system and taking the prepared halogen atom-contained hyperbranched polystyrene macromolecular as the initiator to initiate the polymerization of the atom transfer free radicals of the monomer, thus preparing and obtaining the multi-arm star-type polymer with controllable core structure, core size, core property, arm number, arm length and arm property and adjustable molecular weight within wider range.

The invention discloses a method for preparing a bisphenol A molecularly imprinted polymer. The method comprises the following steps of: adding bisphenol A, a functional monomer and porogen into a conical flask to ensure that the bisphenol A and the functional monomer are fully reacted, wherein the functional monomer is 2- vinylpyridine, and alpha-methacrylic acid, the porogen is chloroform and methylbenzene, the polarity of the chloroform and methylbenzene is low, and hydrogen bonds are not easily formed; adding initiator and a cross-linking agent, fully mixing and performing ultrasonic processing, introducing nitrogen to remove dissolved oxygen, and transferring into a thermostat water bath in a sealing state and performing thermal polymerization; and after reaction, taking out the obtained product, cooling to room temperature to obtain colloidal polymer, screening the colloidal polymer by using a 200-mesh molecular sieve, performing Soxhlet extraction by using acetic acid-methanol, washing the extract by using methanol, and drying under vacuum to obtain the bisphenol A molecularly imprinted polymer. The prepared bisphenol A molecularly imprinted polymer has the characteristics of specific adsorption to specific organic pollutant bisphenol A in industrial wastewater, high selectivity on a sample and high speed, accuracy and efficiency in enrichment and purification.

The invention relates to a method for preparing a ceramic tritium breeding agent in a fusion reactor blanket, pertaining to the nuclear fusion field, in particular to a technique for preparing the ceramic tritium breeding agent pellets in the fusion reactor blanket. The method is characterized in that: organic monomers that can generate free radical polymerization and a crosslinking agent are mixed and dissolved with water or an organic solvent to prepare a pre-mixed solution, then ceramic tritium breeding agent powder is added and an initiator and a catalyst are added after defoaming treatment so as to prepare a slurry; the slurry is dripped into a medium by using a dripping device and the medium is in the state of being heating and is exclusive to the solvent used in the slurry. After entering the medium, the dripping liquid takes the form of pellet, solidifies and maintains the shape during the dropping process; the pellet is collected, cleaned, dried and sintered into the tritium breeding agent ceramic pellet material. The formed blanket has high strength and toughness; the formed pellet has high degree of sphericity, smooth surface and good evenness; the shrinkage after drying and sintering are slight, the size of the pellet is easy to be controlled and the strength is high; additionally, the cost is relatively low and the technique is flexible.

The invention discloses an X-ray imaging device and an imaging method thereof. The X-ray imaging device comprises a base, a slide track is arranged on the base and provided with a first end and a second end, and the upper edge of the slide track is sequentially provided with a ray source control device, a support control device and a receiver control device. The ray source control device comprises a first column, a first pitching motion device and a ray source. The support control device comprises a table top support column and a rotary table top, wherein the table top support column can movably connected to the slide track, and a rotary shaft is arranged in the table top support column. The rotary table top is connected with the rotary shaft and is supported on the table top support column through the rotary shaft. The receiver control device comprises a second column, a second pitching motion device and a receiver. The X-ray imaging device and the imaging method integrates a perspective mode, a cone-beam round track CT mode, a cone-beam a cone-beam track CT mode and a digital theater system DTS mode.

The invention discloses a degradable open-cell porous zinc / zinc alloy biomaterial and a preparation method thereof. The degradable open-cell porous zinc / zinc alloy biomaterial is of a completely open-cell structure, wherein the hole pattern and the size are controllable, holes are communicated by use of communicating holes, and the number and the size of the communicating holes in the hole walls are controllable; the biomaterial is even in overall hole distribution and adjustable in porosity. The preparation method of the biomaterial comprises the following steps that sodium chloride crystal particles are sintered to obtain an open-cell porous sodium chloride prefabricated structure; a zinc or zinc alloy melt is poured into a die cavity in which a sodium chloride prefabricated body is put and pressure seepage casting is performed; the outer skin of a zinc or zinc alloy block containing the sodium chloride prefabricated body is removed, and then alkali wash is performed and the sodium chloride is performed to obtain the degradable open-cell porous zinc / zinc alloy biomaterial. The preparation method of the degradable open-cell porous zinc / zinc alloy biomaterial is simple in process, convenient to operate and pollution-free; the obtained open-cell porous structure has the advantages that the holes are communicated with each other and distributed evenly, the appearance and size of the holes are controllable, the porosity and the strength are relatively high, no hole forming agent is left and hole closure is prevented, and meanwhile, the degradation rate is adjustable; as a result, the biomaterial can be used as a new generation degradable bone tissue engineering stent.