11results about How to "Particle size controllable" patented technology

This invention discloses a method for preparing zeolite molecular sieves with precisely adjustable particle size, comprising the following steps: (1) adding aluminum source and other raw materials to deionized water and stirring evenly at room temperature; (2) adding silicon source, stirring at room temperature, and then adding template agent to obtain precursor slurry; (3) adding zeolite molecular sieve, the amount of zeolite molecular sieve being 1-15 mg / g of precursor slurry, transferring the precursor slurry to a high-pressure reactor, fixing it on a homogeneous reactor, heating to 0-150℃, maintaining for 1-200 h, and then heating to 160-230℃ for 3 hours to crystallize for 6-96 h; (4) obtaining zeolite molecular sieve after centrifugal washing, drying, and calcination. The innovation of the preparation method of this invention lies in the first use of a two-stage synthesis method, which can gradually reduce the particle size of the zeolite molecular sieve product while increasing the yield of zeolite molecular sieves. This method successfully synthesized SAPO-34 zeolite molecular sieve with a particle size deviation of less than 0.4 μm and ZSM-5 zeolite molecular sieve with a particle size deviation of less than 0.2 μm.

This invention discloses a glycosyl carbon quantum dot oil displacement agent for unconventional oil reservoirs, its preparation method, and its application, belonging to the field of oilfield chemical technology. The preparation of the glycosyl carbon quantum dot oil displacement agent for unconventional oil reservoirs of this invention includes: adding a carbon source and a modifier to an alcohol solution, stirring to dissolve, and then carrying out a hydrothermal reaction to obtain the product; wherein the modifier is a ketoxime modifier; this method is simple, low-cost, has controllable particle size, and high yield, making it suitable for industrial application; the obtained carbon quantum dots have a high specific surface area and functional groups such as carboxyl and hydroxyl groups, which can penetrate nanopores and synergistically reduce the oil-water interfacial tension to below 5.0 mN / m; this product has outstanding high-temperature resistance and penetration ability, and can effectively penetrate into the nanopore throat structure of tight reservoirs, significantly improving oil displacement efficiency through interfacial modification, and is particularly suitable for the exploitation of unconventional nano-oil and gas resources.

The present application belongs to the field of gene drug delivery, and particularly relates to a kind of lipid compound with glutaric acid skeleton and lipid carrier, nucleic acid lipid nanoparticle composition and pharmaceutical preparation based thereon.The compound with the structure of formula (I) of the present application can be prepared into lipid carrier alone or together with other lipid compounds.The lipid carrier has high encapsulation efficiency for nucleic acid drugs, which helps to improve the delivery efficiency of nucleic acid drugs in vivo;Multiple biodegradable functional groups are contained, so that the lipid metabolism is fast, and the biological safety is high.Moreover, the lipid carrier can also deliver nucleic acid drugs to organs that need to be enriched, and has good application prospect.

This invention provides an MC-type carbide-reinforced Nb-based alloy spherical powder, its preparation method, and its application, belonging to the field of metal material preparation technology. The invention involves distributing the MC-type carbide-reinforced Nb-based alloy spherical powder according to its composition, followed by suspension induction melting and casting to obtain a master alloy ingot. The master alloy ingot is then machined to obtain an Nb-based alloy electrode rod. Using the Nb-based alloy electrode rod as raw material, powder is produced by plasma rotating electrode atomization to obtain the MC-type carbide-reinforced Nb-based alloy spherical powder. The MC-type carbide-reinforced Nb-based alloy spherical powder prepared by the method of this invention has uniform composition, controllable particle size with a narrow distribution range, good sphericity, low O and N content, and high purity, making it suitable for additive manufacturing.

The application provides a preparation method of organic microspheres. The preparation method comprises the following steps: preparing a first organic polymer seed emulsion by using a vertical reaction kettle with baffles on the inner wall, then adding the seed emulsion into a second organic polymer emulsion, and continuously stirring in the vertical reaction kettle with baffles on the inner wall to obtain the organic microspheres. The method can obtain stable and particle size controllable organic microspheres.

The application provides a method for in-situ combustion synthesis of high-purity nanometer silicon carbide powder, and belongs to the technical field of inorganic nanometer material preparation, and comprises the following steps: placing water-soluble saccharide substances, gel monomers, water-soluble solutions of a crosslinking agent and an initiator into ion exchange columns respectively for filtration purification, then mixing the water-soluble saccharide substances, the gel material and high-purity silicon powder to form a sol, further carrying out in-situ gel solidification and pre-carbonization treatment to obtain a Si / C composite material block; carrying out combustion synthesis reaction on the obtained Si / C composite material, grinding the obtained block-shaped product to obtain the high-purity nanometer silicon carbide powder. The high-purity carbon source and the silicon source are fixed by the gel network, the silicon powder is uniformly embedded in the carbon skeleton, uniform dispersion and close combination of the two are realized, and the in-situ combustion synthesis reaction is efficiently promoted. The raw material cost in the application is low, the preparation process is simple, the environment is friendly, and the application is suitable for industrialized large-scale production of high-purity nanometer silicon carbide powder.

This invention discloses a modified organic black dye and its preparation method, relating to the field of dye modification technology. The preparation method includes the following steps: (1) chemically modifying the organic black dye with a linker to obtain a modified black dye; (2) preparing polymer microspheres using a soap-free emulsion polymerization method; (3) chemically bonding the modified black dye obtained in step (1) with the polymer microspheres obtained in step (2) to obtain a spherical modified organic black dye. The preparation method of this invention combines the organic black dye with polymer microspheres through chemical bonds to form a spherical dye, improving the dye morphology and enhancing its flowability and dispersion uniformity. Furthermore, the polymer microspheres prepared using the soap-free emulsion polymerization technology of this invention have controllable particle size and good monodispersity, resulting in uniform particle size of the final dye particles, making them suitable for applications with strict particle size requirements.

The application discloses a composite seed for inducing target ion reaction in water and a preparation method and application thereof, and belongs to the technical field of water treatment. The preparation method of the composite seed is as follows: target cations and target anions are selected according to target ions to be reacted; a porous carrier is soaked in a first solution containing the target cations; a second solution containing the target anions is added dropwise under stirring, and the dropping speed is controlled to make the supersaturation degree of the system lower than the critical supersaturation degree of homogeneous nucleation, so as to force the target cations and the target anions to react on the inner surface of the pores of the carrier, generate nanocrystal nuclei in situ and grow; and the composite seed is obtained through aging, solid-liquid separation, washing and drying. The nanocrystal nuclei have the same crystal structure as the composition of the target ions to be reacted. Through the in-situ loading process, the nanocrystal nuclei are firmly loaded in the pores of the porous carrier, and the target crystal nucleus design is combined, so that the reaction efficiency of the fluidized bed is remarkably improved, the activity of the crystal nucleus is long-lasting, and the composite seed has a good industrial application prospect.

The application discloses a preparation method of modified nanometer carbon material and a lithium ion battery. An equipment for implementing the preparation method comprises a feeding machine, an air flow pulverizer and a magnetic field removing machine arranged in sequence along a material running direction, and the air flow pulverizer and the magnetic field removing machine are arranged in sequence from top to bottom along a height direction. The preparation method comprises the following steps: in step 1, nanometer carbon material and modified material are mixed according to a mass ratio of 100:0.1-5, and then the mixture is fed into the air flow pulverizer through the feeding machine, wherein the modified material comprises a polymer and a small molecule amine, and the mass ratio of the polymer to the small molecule amine is 100:5-10; and in step 2, after the material is pulverized by the air flow pulverizer, the material is fed into the magnetic field removing machine in a free fall mode under the action of gravity to remove the magnetic field. The nanometer carbon material has better dispersity and lower metal impurity content.

This invention discloses a bioactive nanomicelle based on idebenone. By designing idebenone molecules with hydrophobic ends and functionalized hydrophilic polyethylene glycol, it exhibits excellent responsiveness, antioxidant properties, and cellular safety, making it suitable as a carrier for delivering drugs, genes, or other bioactive molecules for therapeutic and diagnostic applications. This invention also discloses a method for preparing this idebenone-based bioactive nanomicelle. The method for synthesizing the amphiphilic polymer of IDBP is simple, with mild reaction conditions, easy synthesis, convenient post-processing, high yield, and easy industrial production. The prepared amphiphilic polymer exhibits spontaneous assembly behavior in aqueous solution, forming a stable nanomicelle structure. This demonstrates the great potential of idebenone-based bioactive nanomicelles in drug delivery, potentially improving drug stability, bioavailability, and targeting.

This invention discloses a method for preparing a microcapsule-structured specialty coffee extract, the extract itself, and its applications, belonging to the field of fragrance and flavor technology. The method includes: adding an emulsifier to the specialty coffee extract and emulsifying it at 1530°C to obtain an emulsion; preheating a melamine resin prepolymer to 4045°C and adding it to the emulsion; raising the temperature to 4550°C within 15 minutes and adjusting the pH to 4.5-5.5 for the first stage reaction; then raising the temperature to 6080°C for the second stage reaction; and finally cooling and adjusting the pH to 7.5-8.5 to terminate the reaction, thus obtaining the microcapsule-structured specialty coffee extract. This invention, through room-temperature emulsification and a two-stage temperature-controlled process, effectively preserves the complex aroma of the specialty coffee extract. The resulting microcapsule structure is dense and stable, possessing both sustained-release and rapid aroma release via friction, significantly extending the aroma retention time. This invention also provides the application of the microcapsule-structured specialty coffee extract in the preparation of pet products.