8results about How to "Good spherical shape" patented technology

The invention provides a preparation method of an anti-blow-off porous carbon material for a silicon-carbon negative electrode, which comprises the following steps: (S1) preparing a solvent, an emulsifier and a nucleating agent into a mixed solution, adding a resin oligomer and a curing agent, polymerizing into spherical resin under the condition of stirring at 40-80 DEG C, and drying and agglomerating into blocks; the emulsifier comprises a micromolecule anionic surfactant and a polymer emulsifier; (S2) crushing and screening to obtain spherical agglomerates with proper particle sizes, and pyrolyzing and carbonizing the spherical agglomerates in an inert atmosphere to obtain pyrolytic carbon; (S3) performing activated pore-forming on the pyrolytic carbon in an activated atmosphere to obtain an activated carbon aggregate; and (S4) depolymerizing and separating the activated carbon aggregate to obtain the porous carbon material. According to the invention, the spherical particles are greatly agglomerated, the pain point of gas blow-off in the industrial activation process is solved, the activation yield is improved, and meanwhile, the mechanical properties of the material can be adjusted by controlling the crosslinking degree.

The invention belongs to the field of nano material preparation, and particularly relates to a preparation method of nanoscale silicon dioxide alcohol-soluble sol. The method comprises the following steps: dissolving a water-soluble polymer in an ammonia water solution, and then adding absolute ethyl alcohol to form a polymer micelle; adding tetraethyl orthosilicate into the micelles, obtaining a nanoscale silicon dioxide nanoparticle mixed solution after the reaction is finished, then dispersing the nanoscale silicon dioxide nanoparticle mixed solution in deionized water through centrifugation, then centrifuging to obtain pure silicon dioxide particles, dispersing the pure silicon dioxide particles in absolute ethyl alcohol, adding a silane coupling agent KH570 at the same time, and performing ultrasonic dispersion to obtain the nanometer silicon dioxide nanoparticles. And carrying out ultrasonic dispersion to obtain the nanoscale silicon dioxide alcohol-soluble sol.

The invention discloses a hollow silicon dioxide microsphere with a double-layer shell structure and a preparation method thereof, the hollow silicon dioxide microsphere with the double-layer shell structure is a spherical body comprising an inner core layer and an outer shell layer, the inner core layer and the outer shell layer are spherical bodies, the inner core layer and the outer shell layer form the double-layer shell structure, the inner core layer is located in the outer shell layer, and the outer shell layer is located in the outer shell layer. The interior of the inner core layer is of a hollow structure, a hollow structure is formed between the inner core layer and the shell layer, and the thickness of the inner core layer is 10-100 nm; the thickness of the outer shell layer is 10-50nm; the distance between the inner core layer and the outer shell layer is 5-100nm, mesopores are uniformly distributed in the inner core layer and the outer shell layer, and the pore diameter of the mesopores is 1-10nm. The hollow silicon dioxide microsphere with the double-layer shell structure is uniform in particle size distribution, good in monodispersity, relatively high in strength and good in dispersity. The preparation method of the microspheres is simple and easy to implement and easy to industrialize, and the hollow silicon dioxide microspheres with the double-layer shell structure can be prepared through a self-template method and a simple and effective selective etching strategy.

The present invention belongs to the field of new drugs, and provides a brepirazole sustained-release microsphere with no lag period and stable release and a preparation method thereof, wherein the microsphere comprises brepirazole, additives and lactide-co-glycolide copolymer, and has good microsphere morphology, high drug loading and encapsulation efficiency. The present invention obtains brepirazole microspheres with good morphology by adding oil phase additives and adjusting the composition of the aqueous phase; the more critical advantage is that the obtained brepirazole microspheres have excellent release characteristics: no lag period, stable release. In addition, the preparation method of brepirazole microspheres provided by the present invention has the technical advantages of simple process, high yield, and easy large-scale production.

This application relates to a sodium manganese ferric phosphate pyrophosphate cathode material, its preparation method, and its application. The cathode material comprises sodium manganese ferric phosphate pyrophosphate and a conductive carbon layer coated on the outer surface of the sodium manganese ferric phosphate pyrophosphate; wherein the chemical formula of the sodium manganese ferric phosphate pyrophosphate cathode material is Na₄Fe₄. x Mn 2.91‑x (PO4) 2‑2y (D) 3y P₂O₇ / C, 0.9 ≤ x ≤ 2.1, 0 < y ≤ 0.05; D is selected from SiO₄ 2‑ or SO4 2‑ At least one of the following; the compaction density of the sodium manganese phosphate pyrophosphate cathode material is 2.3 g / cm³. 3 The above. This application improves the poor structural stability and poor sodium ion transport kinetics of sodium manganese iron phosphate pyrophosphate cathode material by adding anionic dopant in the preparation method, and also solves the problem of high impurity content in sodium-ion battery cathode materials in the prior art.

The application discloses a long-acting hydrogen-releasing microsphere in the stomach and use of the microsphere as a drug in treatment of gastritis, and belongs to the field of pharmaceutical preparations and hydrogen treatment. The composition provided by the application is composed of a hydrogen production micro-particle as a core and a sustained-release agent composed of hydroxypropyl methyl cellulose and ethyl cellulose. By selecting specific components and processes, the microsphere has good floatability and long-acting hydrogen-releasing capacity. The microsphere can float in the gastric juice environment and gradually release hydrogen, so that the sustained anti-oxidation and anti-inflammatory effects are realized, and the microsphere is suitable for treatment of gastric inflammation.

The invention discloses a synthesis method of spherical hydroxyapatite with a controllable particle size. Firstly, a water / ethylene glycol mixed solution is prepared, and a morphology control agent and a granularity control agent are dissolved in the water / ethylene glycol mixed solution; secondly, respectively dissolving calcium salt and carbonate into the equant water / ethylene glycol mixed solution; and then pumping the calcium salt solution into the carbonate solution, heating and stirring for reaction, and adding the solution with the granularity control agents with different concentrations to obtain spherical calcium carbonate with different granularities. And finally, synthesizing the spherical hydroxyapatite from the template calcium carbonate and a phosphorus source under an alkaline condition through a hydrothermal reaction assisted by a mechanical stirring method. Compared with the prior art, the spherical hydroxyapatite prepared by the method disclosed by the invention has good spherical morphology and dispersity and high crystallinity, and the particle size can be controllably modulated within 300-1600 nm.

The invention provides a method for preparing small-particle-size spherical silver powder through in-situ nucleation, and the method comprises the following steps: mixing a first dispersing agent solution with an alkaline substance to obtain a nucleation inducer; mixing a second dispersing agent solution with the nucleation inducer, then mixing with the first oxidizing agent solution in a stirring state, and carrying out an in-situ reaction to obtain a nucleation solution; simultaneously adding a second oxidant solution and a reducing agent solution into the nucleation solution, mixing and reacting to obtain a mixed solution; and the mixed solution is subjected to solid-liquid separation, and the spherical silver powder is obtained. According to the method, the preparation process is easy to operate and continuous, crystal nucleuses can be formed in situ under the conditions of not additionally preparing and adding seed crystals and not introducing other dispersing agents, and the small-particle-size silver powder is rapidly prepared. The prepared spherical silver powder has good spherical morphology and uniform and concentrated particle size distribution.