12 results about "Micro nanoparticles" patented technology

This invention provides a method for preparing a particle-self-supported oxygen evolution electrode with localized phase transition induced by electro-oxidation. First, an electrochemical deposition technique is used to construct a sheet-like cobalt structure on the surface of nickel foam, forming a three-dimensional conductive framework with a high specific surface area, providing more adsorption sites for subsequent particle loading. Simultaneously, the hydroxyl groups generated from surface hydrolysis participate in subsequent reactions. Second, ultrasonic induction is used to induce a bonding reaction between the carboxyl groups on the surface of the micro / nano particle material and the hydroxyl groups on the substrate surface, strengthening the interaction between them and achieving particle loading on the substrate. Finally, a prolonged electro-oxidation treatment of the particle-loaded electrode stimulates the synergistic effect between the particles and the cobalt electroplated layer, promoting an interfacial reaction that significantly changes the material's microstructure, forming a more robust new phase between the particles and the substrate.

This invention discloses a method for scalable preparation of 5-fluorouracil-loaded lyophilized nanoparticles. The method first involves self-assembling 5-fluorouracil into a polymer carrier to form core-shell nanoparticles. Then, the hydrophobic core-shell nanoparticles undergo a double emulsification-isothermal evaporation process to form hydrophilic micro / nanoparticles. Finally, D-mannose is assembled onto the surface of the micro / nanoparticles, followed by gradient freeze-drying to prepare PLGA / 5-FU-loaded lyophilized nanoparticles. This method offers advantages such as simple operation, scalability, and good reproducibility. The 5-FU drug in the prepared lyophilized nanoparticles exhibits good crystallinity. During the inhibition of pancreatic cancer cell growth, it effectively improves the bioavailability, biocompatibility, and physical stability of 5-fluorouracil, significantly inhibiting pancreatic cancer cell growth and demonstrating high anti-tumor immunomodulatory properties.

A method for translocating a cationic micro / nanoparticle across a mucus layer, the method including (a) contacting the mucus layer with at least one alginate oligomer, the alginate oligomer having at least 70% mannuronate residues, together with the cationic micro / nanoparticle; or (b)(i) contacting the cationic micro / nanoparticle with an alginate oligomer having at least 70% mannuronate residues thereby forming a micro / nanoparticle carrying the alginate oligomer, and (b)(ii) contacting the mucus layer with the micro / nanoparticle prepared in step (b)(i). There is also provided a method for translocating a molecule of interest across a mucus layer including contacting the mucus layer with a micro / nanoparticle which is formed of self-assembling micro / nanoparticle forming components, wherein at least one is a cationic micro / nanoparticle forming agent and at least one is an alginate oligomer which has at least 70% mannuronate residues, and further comprises the molecule of interest, optionally wherein the molecule of interest is covalently bound to one or more of the self-assembling micro / nanoparticle forming components.

This invention discloses a rapid water transport superspreading hydrogel material and its preparation method. The method includes loading a surfactant onto porous or hollow micro / nanoparticles using negative pressure rotary evaporation technology; in-situ growing and modifying a hydrophobic silica nanoparticle shell on the surface of the porous or hollow particles to form photothermal conversion superhydrophilic core-shell particles; subsequently, mixing the photothermal conversion superhydrophilic core-shell particles, hydrogel monomers, initiators, crosslinking agents, and co-crosslinking agents in a certain proportion under low-temperature conditions; and obtaining a rapid water transport superspreading hydrogel precursor after uniform dispersion; finally, obtaining the rapid water transport superspreading hydrogel material through directional freezing or chemical crosslinking. This invention, by doping the hydrogel with photothermal conversion superhydrophilic core-shell particles, on the one hand, endows the hydrogel with superspreading properties, significantly improving the water contact angle and spreading speed, enabling rapid seawater transport in solar-driven interfacial evaporation; on the other hand, the combination of porous or hollow micro / nanoparticle loading and the encapsulation effect of the hydrophobic silica shell significantly slows down surfactant loss, thereby extending the service life of the superspreading hydrogel.

The present application aims to provide a kind of armored bubble dispersion liquid generation and use method, belong to the field of flotation technology, the present application will hydrophobicity micro-nano particle be preloaded on the surface of flotation bubble by homogeneous shearing effect and construct hydrophobicity armored layer, to promote the adhesion between bubble and coal.Hydrophobicity micro-nano particle loaded on the surface of bubble is armored particle.Hydrophobicity micro-nano particle on bubble will change the mechanism of action between bubble and coal surface, from traditional uniform gas-liquid interface to inhomogeneous gas-solid-liquid interface and coal surface action.By the method of the present application, it is helpful to improve the overall flotation efficiency.

The application discloses flower-shaped silver micro-nanoparticles and application of the flower-shaped silver micro-nanoparticles in preparation of polymer microporous materials, and the flower-shaped silver micro-nanoparticles are prepared by the following steps: reacting silver nitrate with a structure directing agent in a solvent, adding a reducing agent into the solution, continuing to react, centrifuging, washing and drying the precipitate to obtain flower-shaped silver powder; adding all the flower-shaped silver powder into a reaction kettle, controlling the humidity of nitrogen atmosphere in the reaction kettle to be 10%-15% and keeping for 30 min, closing the air knob, rapidly injecting a modifier, sealing the reaction kettle, and reacting for 30 min at room temperature to obtain the flower-shaped silver micro-nanoparticles; the flower-shaped silver micro-nanoparticles prepared by the application can be used as a high-efficiency heterogeneous nucleating agent, can significantly improve nucleation efficiency, can reduce cell size, and can make cell density reach 10-11 orders of magnitude and be improved by 1-2 orders of magnitude. The method is simple in operation and easy to control, and is expected to be used in industrialized application of polymer supercritical CO2 foaming and improve economic benefits.

This disclosure provides a triboelectric additive manufacturing method and apparatus. The method includes: establishing triboelectric contact between a printing tip and a sample to be processed; and, during the injection of lubricating fluid into the triboelectric contact area between the printing tip and the sample, increasing the concentration of micro / nano particles in the lubricating fluid in the contact area by controlling the evaporation of a base fluid in the lubricating fluid. The apparatus includes: a loading unit with a fixed printing tip, a lubricating fluid injection unit, a driving unit, and a base fluid evaporation control unit. This disclosure utilizes a triboelectric / negative wear method to prepare micro / nanowires on a sample. By controlling the evaporation of the base fluid, the local concentration of micro / nano particles in the contact area is increased, promoting the formation of a triboelectric material transfer film or a tribochemical reaction film caused by friction, thereby improving the preparation efficiency of micro / nanowires, and the prepared structural precision can reach the submicron or even nanometer scale.

The application relates to a preparation method of a passive cooling fiber material and fabric, which is spontaneously cooled through direct regulation of energy absorption and dissipation on the surface without consuming conventional energy. The method comprises the following steps: mixing high-refractive inorganic micro-nano particles, a modifier and a polymer base to obtain a composite material master batch, then performing composite extrusion molding in a spinning assembly, and winding to obtain the passive cooling fiber material. The application adopts a melt spinning method, effectively controls the dispersion degree of the high-refractive inorganic micro-nano particles in the fiber by using the modifier, that is, the size and distribution of the micro-nano particle aggregates, so that the optical properties and mechanical properties of the fiber are changed, and finally the passive cooling fiber material with precise solar radiation regulation function is obtained. The passive cooling fiber material and the fabric prepared by the application have excellent passive cooling performance and mechanical properties, and have the advantages of large-scale batch preparation, low cost and high production efficiency.

This invention relates to the field of sodium-ion battery technology, specifically disclosing a sodium-ion battery cathode material, its preparation method, a battery cell, and a battery. The cathode material involves the sequential stacking of single-crystal particles, near-single-crystal particles, and aggregated particles along a vertical direction from a foil substrate. The single-crystal particles are single, blocky crystals; the near-single-crystal particles are secondary particles formed by the stacking and connection of multiple single-crystal particles, which are mixed with and fill the gaps between the single-crystal particles; the aggregated particles are secondary particles formed by the stacking of multiple micro / nano particles, used to provide a rapid migration channel for ions at the cathode, shortening the ion migration distance and enabling fast charging of the sodium-ion battery. This invention involves the sequential stacking of three layers of three types of active particles—single-crystal particles, near-single-crystal particles, and aggregated particles—starting from the vertical direction of the foil substrate. This multi-gradient cathode material design greatly improves the space utilization and energy carrying capacity of the active material on the electrode, while also providing fast charging capability.

The application provides a method for automatic patterning and ordered arrangement of low-dimensional micro-nano materials, which comprises the following steps: setting an upper substrate and a lower substrate, constructing an electric field between the upper substrate and the lower substrate by using corona discharge; placing micro-nano particles in the electric field and making the micro-nano particles move orderly along the direction of the electric field; preparing a patterning substrate at the bottom of the upper substrate, setting a conductive area and an insulating area on the patterning substrate, filling the micro-nano particles in the insulating area, and making the micro-nano particles move back and forth rapidly along the direction of the electric field; based on the principle that the micro-nano particles are bounced off from the conductive area and stay in the insulating area, the micro-nano particles are arranged perpendicularly to the edge of the conductive area, thereby outlining the pattern of the insulating area of the patterning substrate, automatically completing the pattern filling, improving the printing efficiency, and simultaneously enabling the low-dimensional micro-nano materials to be arranged rapidly and orderly without the need of a liquid carrier, and improving the sensitivity of a device.

The application discloses a tantalum alloy metal powder suitable for metal additive manufacturing and a preparation method thereof, and relates to the technical field of additive manufacturing. The application utilizes cationic surfactant to treat tantalum powder, utilizes anionic surfactant to treat active particles, and then utilizes electrostatic interaction between different positive and negative charges to synthesize self-assembled active composite powder. The prepared tantalum alloy spherical powder still maintains good sphericity, hardly causes influence on powder sphericity and fluidity, and can promote good metallurgical reaction between micro-nano particles and a matrix in an additive manufacturing part, so that the micro-nano particles can form various tantalum alloy high-performance materials required by users.