43results about How to "Low preparation environment requirements" patented technology

The invention discloses a method for preparing a hollow microneedle through an ultraviolet-curing process using a soluble fiber as a core material. The method can be carried out at the room temperature, and the preparation time is short, which is advantageous for preparing a hollow microneedle array quickly and batchwise. Compared with an existing hollow microneedle preparation method, an ultraviolet-curing molding method is adopted to avoid a heating and melting process of a polymer material, a high temperature condition is not required, and requirements for a preparation environment are low;the ultraviolet-curing process has a short molding time, and the microneedle can be formed by 2-3 minute exposure of a photoresist in an ultraviolet light, which greatly shortens the preparation cycle; the hollow part of the microneedle adopts a molding method of using the soluble PVA fiber as the core material, due to the characteristic that the soluble PVA fiber can be dissolved in the water, so that the molding process of the hollow part becomes simple and fast, and the molding difficulty of the hollow microneedle is reduced.

The present invention provides a method for preparing a graphene-based chip heat-radiating material, which comprises the steps of: providing a substrate on which horizontal graphene is prepared; placing the substrate in a reaction chamber, after vacuum pumping is performed on the reaction chamber, reducing gas is introduced into the reaction chamber and increasing the temperature to a preset temperature, and then performing plasma preprocessing on the substrate; introducing of the reducing gas is kept and furthermore growing gas is introduced for growing vertical graphene on the surface of the horizontal graphene; and stopping introduction of the growing gas and reducing temperature of the reaction chamber, and then transferring the horizontal graphene and the vertical graphene to the surface of the chip on which heat radiation is to be performed. According to the method, the hot spot heat which is generated by operation of the device is radiated to the surface of the device through the horizontal graphene, and then relatively large specific surface area of the vertical graphene is utilized for radiating heat of a large-power chip in the horizontal direction to surrounding environment through the large specific surface area, thereby improving heat radiating efficiency. The method for preparing the graphene-based chip heat-radiating material has advantages of: simple process, easy operation and low requirement for preparing environment.

The invention discloses a method for preparing a nano-silver / D-cysteine antibacterial coating on the surface of medical metal. The method comprises the steps that the medical metal is sequentially subjected to ultrasonic treatment through acetone, ethyl alcohol and deionized water; a dopamine solution is prepared, the medical metal is put in the dopamine solution for soaking, after the medical metal is taken out, dopamine particles which are not stably attached to the surface are subjected to ultrasonic removal, then the medical metal is put in a silver nitrate solution for soaking, and then apoly-dopamine-nano-silver coating is formed on the surface of medical metal; afterwards, the medical metal loaded with the nano-silver particles is put in a D-cysteine solution for a reaction to obtain the nano-silver / D-cysteine antibacterial coating. The composite nano-structure prepared by means of the method is simple and feasible in technology, and has the functions of efficient spectral bacterial resistance and biomembrance adhesion resistance; meanwhile, the nano-silver / D-cysteine antibacterial coating has good biocompatibility, and has very important application value in developing novel in-vivo implant materials.

The invention discloses a sensitized solar cell counter electrode material, comprising polyacrylonitrile carbon nanofibers and loads, the loads are loaded on the polyacrylonitrile carbon nanofibers, and the loads are noble metals, metal carbonized One of the compounds, metal nitrides or metal oxides; the preparation method is to dissolve polyacrylonitrile in dimethylformamide, inject it into a high-voltage electrospinning machine for spinning, and carbonize it to obtain polyacrylonitrile carbon nano Fiber: loading the load on the polyacrylonitrile carbon nanofiber through sintering, vapor deposition or magnetron sputtering to prepare a sensitized solar cell counter electrode material. The preparation process provided by the present invention is simple, easy to operate, and low in cost. The prepared solar cell counter electrode material has uniform texture and good catalytic performance. Using the prepared counter electrode in a sensitized solar cell can effectively improve the photoelectric conversion efficiency. It has played a great role in promoting the industrialization of sensitized solar cells.

The invention discloses a paclitaxel loaded catenulate nano fiber and a preparation method thereof. At first, catenulate nano fiber is prepared, then paclitaxel is loaded on the beads to form a drug sustain-released system, and thus slow releasing of paclitaxel can be effectively controlled. Furthermore, the biocompatibility is good, the drug encapsulation rate is high, and the activity is strong. The provided dosage form of paclitaxel has the advantages of little side and toxic effect and sustained-release function, and can be applied to preparation of drugs for treating malignant tumors.

The invention relates to a preparation method of polyamide-imide copolymer fiber, which belongs to the technical field of spinning fiber, comprising (1) dissolving trimellitic anhydride and dianhydride monomers in an aprotic polar solvent, under nitrogen protection, Stir at low temperature to obtain a mixed solution; add diphenylmethane diisocyanate monomer in batches, and gradually heat up to 130-180°C to obtain a copolymerized modified polyamide-imide spinning stock solution; (2) polyamide-imide After vacuum defoaming and filtration, the spinning stock solution passes through the spinneret and enters the primary coagulation bath to obtain primary fibers, and then passes through the secondary coagulation bath, hot water drawing, washing, drying, oiling, and dry heat drawing Stretching, heat setting, cooling and oiling and winding to obtain polyamide-imide copolymer fibers. The preparation method of the invention has simple process, and the intermediate acid is easy to store, and the prepared polyamide-imide copolymer fiber has the characteristics of high strength and excellent ultraviolet aging resistance.

The invention discloses a preparation method of a light-emitting device, and belongs to the technical field of dissolvable flexible electronic devices. The light-emitting device includes: a dissolvable lower electrode, a dissolvable light-emitting functional layer and a dissolvable lower electrode. Specifically, silver nanowire-polyvinyl alcohol is used as the lower electrode, and the upper layer of the lower electrode is a fluorescent powder light-emitting functional layer and a silver nanowire-polyvinylpyrrolidone upper electrode. The present invention adopts a sandwich light-emitting device structure in which a layer of light-emitting layers is added to the upper and lower electrodes, and adopts a full-solution method to prepare the device without requiring large-scale equipment such as high-vacuum evaporation magnetron sputtering, and the preparation process is simple and low in cost. The soluble device has the advantages of stable light emission, low energy consumption, recyclability, environmental protection and the like.

The invention relates to a method for preparing an active graphite felt electrode by electrolysis. Using graphite felt as a base material, oxygen functional groups and nitrogen functional groups are introduced into the graphite felt by means of constant voltage electrolysis in an ammonium salt solution to obtain an iron-chromium flow battery. Active graphite felt positive and negative electrode materials: prepare 0.5‑5mol / L ammonium salt solution; impregnate graphite felt into the ammonium salt solution; In the salt solution, apply a constant voltage of 0.5-5.0V to electrolyze the ammonium salt solution, and dry it at 60-80°C. The advantages are: simple and fast operation, low price, and low requirements on the preparation environment, which reduces the preparation cost of the flow battery.

The present invention relates to a kind of AlMgB 14 A method for preparing a ceramic material powder, comprising: using absolute ethanol as a solvent, ball milling and mixing raw material powders to obtain a mixed slurry, wherein the raw material powders include a mass ratio of 1:(1.2~1.4):(3.6~ 4.2) Al powder, MgB 2 powder and boron powder; and drying the mixed slurry, pre-pressing to obtain a block, and then sintering under a protective atmosphere.

The invention discloses an anti-oxidation treatment method for sintering a nd-fe-b material and an antioxidant. The anti-oxidation treatment method comprises the following steps of: in a jet milling stage, injecting the antioxidant into the nd-fe-b material in a spray manner, wherein the antioxidant is evenly coated by magnetic powder during jet milling; sealing and mixing the powder under an air condition; carrying out compression molding in an air atmosphere; and sintering under a low vacuum condition to obtain a blank. Anti-oxidation auxiliaries used are benzotriazole and petroleum ether the volume ratios of which are respectively 0.05-5% and 99.95-95%. According to the invention, requirements for preparation environment are reduced, the preparation is simple and flexible, energy saving and consumption reduction effects are achieved, and a finished magnet has properties similar to those of materials prepared in a non-air atmosphere.

The invention relates to a method for activating graphite felt electrodes etched by nickel salts. Using graphite felt as a base material, the surface of the graphite felt is etched by coating nickel salt and sintering at elevated temperatures in stages, and a large amount of oxygen functional groups and catalyst nickel are introduced to obtain Active graphite felt electrodes for flow batteries etched by nickel salts. The advantages are: the invention is simple and quick to operate, low in price, and has relatively low requirements on the preparation environment, thereby reducing the preparation cost of the liquid flow battery. The active graphite felt prepared by the method of the invention is used as the electrode of the iron-chromium flow battery, the efficiency of the battery is improved, and the capacity loss is reduced, so that the electrochemical performance and stability of the iron-chromium flow battery are improved.