47results about How to "Uniform and controllable shape" patented technology

The invention discloses a novel method for performing a copolymerization reaction of dicyclopentadiene and maleic anhydride, and belongs to the technical field of copolymers. The method comprises the following steps of: under the protection of nitrogen, adding monomers and an initiator into an organic medium and dissolving, reacting for 2 to 12h at the temperature of between 60 and 90 DEG C to obtain a self-stabilizing dispersion system of monodisperse microspheres of an alternating copolymer, and performing centrifugal separation, and drying to obtain a white solid of the dicyclopentadiene / maleic anhydride alternating copolymer, wherein the reaction monomers are the dicyclopentadiene and the maleic anhydride, and the molar ratio of the two monomers is 5:1-1:5; the medium is a mixed solvent of organic acid alkyl ester and organic alkane, and the organic acid alkyl ester accounts for 30 to 70 volume percent of the mixed solvent; and a chemical structure is that: R1 is a hydrogen atom, C1-C5 alkyl, phenyl or benzyl, and R2 is C1-C5 alkyl. A stabilizer and a costabilizer are not required to be added, the reaction system is simple, and a product is easy to separate; and polymer microspheres have smooth and clean surfaces, uniform particle sizes, controllable appearances, and high dispersibility.

The invention discloses a preparation method for cuboid-shaped indium oxide single crystal, which belongs to the hydro-thermal method and consists of the steps of preparing a feature control agent, preparing indium saline solution, preparing a precursor, offcenter separation, calcination, natural cooling, etc. By using the feature control agent, the invention solves the problems that the feature of a sample is difficult to control and easy to collapse and the crystal formed is polycrystal when the hydro-thermal method is used in the prior art; preparing the cuboid-shaped indium oxide single crystal with a controllable feature by using the hydro-thermal method is realized; Owing to the invention, the decentrality of the obtained indium oxide single crystal is good; the feature is uniform and controllable; the preparation method of the invention is simple; the raw material is easy to get; the cost is low; the single crystal of the invention can be suitable for a large scale of industrialized production.

The invention relates to a nickel sulfide-cadmium sulfide nanowire heterostructure and a preparation method thereof and belongs to the technical field of preparation of new energy materials. According to the composite material provided by the invention, the main body is the cadmium sulfide nanowire, and dentritic beta-NiS sheets are attached to the surface. The material has excellent capacity of performing visible catalytic decomposition on water to produce hydrogen. The preparation method comprises the following steps: preparing the cadmium sulfide nanowire by a solvent thermal process; taking the obtained cadmium sulfide nanowire as a template, taking nickel acetate as a nickel source, taking thiourea as a sulfur source, taking sodium hypophosphite as a reducing agent, uniformly growing beta-NiS nanosheets on the surface of cadmium sulfide in a hydrothermal environment, thereby obtaining the nickel sulfide-cadmium sulfide nanowire heterostructure with tight combination and dispersing uniformity. The product obtained by the method is high in yield, high in purity and controllable in morphology and does not need after-treatment; and moreover, the method has the advantages of simplicity in equipment and process, strict and controllable synthetic growth conditions, high product yield, low cost, clean and environmental-friendly production process and the like.

The invention discloses a preparation method for a platinum-silver alloy hollow nanoflower. The method comprises the following steps: taking sodium polyacrylate as a stabilizer and taking ascorbic acid as a reducing agent; reducing silver nitrate at the room temperature to synthesize a silver nanoflower; and introducing potassium chloroplatinite as a platinum source through galvanic reducing process, thereby directly obtaining the platinum-silver alloy hollow nanoflower. The preparation method is simple and economical; the obtained platinum-silver alloy hollow nanoflower is regular in shape and is uniform in dimension, has ultrahigh catalytic activity and stability in an alkaline formic acid fuel cell, has a potential application prospect in the fuel cell field, and is suitable for industrial large-scale production.

A method for preparing a bismuth-molybdenum bimetallic sulfide, a negative electrode material for a sodium ion battery, comprising the following steps: (1) weighing a bismuth source and a molybdenum source at a molar ratio of Bi:Mo=2:1, and then adding In the diol container, stir to dissolve, mix the ethylene glycol solution dissolved with bismuth source and molybdenum source, and stir to form a uniform mixed solution; (2) Add absolute ethanol to the mixed solution, stir evenly, and place in the reaction Solvothermal reaction in the still; (3) Centrifugal washing and drying; (4) Place the bismuth molybdenum oxide precursor in the corundum ark and in the middle of the tube furnace, and place a For the corundum ark of the sulfur source, the tube furnace is sealed and the reducing gas is introduced. After heat treatment, it is naturally cooled to room temperature. The invention has short process flow, controllable parameters, simple equipment, wide sources of raw materials, and environmental friendliness, and bismuth-molybdenum bimetallic sulfide materials with different nanoscales can be obtained by adjusting relevant parameters.

The invention discloses an open-width mercerizing device used for a cotton weft plain knitted fabric and a mercerizing method and belongs to the textile printing and dyeing pretreatment technology field. According to the coil form changes of different areas and structure parameters, the density of an area mesh surface is adjusted so as to ensure that the force of each fabric unit is the same and the coil form changes are uniform. During a traditional mercerizing process, a fabric stress is not uniform and the coil form changes are uneven. In the invention, the above problems are solved. Simultaneously, the mixed liquor of an alcohol organic solvent and water is used to prepare a sodium hydroxide solution, and ultrasonic assisted treatment is used so that sodium hydroxide easily and uniformly penetrates in a cotton fiber and the uniformity of swelling is ensured. The cotton knitted fabric processed by the method of the invention has good glossiness, good dyeing performance, excellent softness, stable size and good wrinkle resistance, and a coil form is uniform and controllable. The alcohol organic solvent adopted in the invention is safe and non-toxic, and is easy to recycle, economic and energy saving are achieved, and the safety and environmental protection are realized.