36 results about "Micro nanoparticles" patented technology

The invention discloses a dispersion distribution method for a micro-nano multi-scale mixed SiC particle reinforced phase in an aluminum-based composite material and the composite material, and relates to the technical field of metal-based composite material preparation. The method comprises the following steps: firstly, carrying out ultrasonic cleaning, ultrasonication and two-stage high-temperature oxidation treatment on SiC particles, and generating an oxidation film on the surfaces of the particles; ball-milling and mixing the treated micron and nano SiC particles and micron pure magnesium particles according to a specific proportion, and pressing into a precast block; then preparing an aluminum alloy melt, cooling to a solid-liquid two-phase region, carrying out semi-solid stirring, and adding the preheated precast block; and finally, raising the temperature to be above a liquidus, rewarming, stirring and molding by casting. Through the synergistic effect of ultrasonic physical dispersion, high-temperature oxidation surface modification and magnesium-induced semi-solid stirring, the problems that micro-nano particles are prone to agglomeration, wettability is poor and interface reaction is difficult to control are effectively solved, multi-scale uniform dispersion distribution of a reinforced phase in an aluminum matrix is achieved, and the comprehensive performance of the composite material is remarkably improved.

The invention discloses an in-situ doped ZnO paper-based insulating material and a preparation method thereof, and belongs to the technical field of paper-based special materials in paper industry. The method disclosed by the invention comprises the following steps: mixing and stirring zinc chloride and water to obtain a zinc chloride hydrated eutectic solvent; then soaking the porous base paper in a zinc chloride hydrated deep-eutectic solvent for swelling treatment to obtain gelatinized base paper; immersing the gelatinized raw paper into an ethanol / water anti-solvent system for regeneration treatment to obtain regenerated raw paper; then dipping the regenerated raw paper in alkali liquor for in-situ deposition treatment to obtain raw paper with ZnO micro-nano particles loaded and doped on the surface; and performing post-treatment on the body paper with the surface loaded and doped with the ZnO micro-nano particles to obtain the in-situ doped ZnO paper-based insulating material. According to the method disclosed by the invention, in-situ doping of the ZnO micro-nano particles is successfully realized in the densified base paper, and the dielectric property is further remarkably improved by cooperating with the densification effect.

The present application belongs to the technical field of agricultural bio-based slow-release carriers and pesticide formulations, and relates to a kind of lignin-based pesticide controlled-release micro-nanoparticles with multiple stimuli response and a preparation method thereof, lignin and hydrochloric acid dopamine are dissolved in buffer solution in proportion, an oxidizing agent is added thereto, stirred and reacted to obtain a lignin-polydopamine composite solution, which is purified by dialysis in water, dried to obtain a lignin-polydopamine solid powder; the lignin-polydopamine solid powder and abamectin are mixed in an organic solvent in a mass ratio of 1-5:1, then water is added in portions while stirring, the polarity of the system is changed, and the lignin-polydopamine micro-nanoparticle drug-loaded particles loaded with abamectin are precipitated, which are dried to obtain the present application. The abamectin delivery system has multiple environmental responsiveness, long-acting leaf adhesion function and controllable release characteristics.

The present application relates to the technical field of medicine, in particular to a functional nanomaterial based on choline phosphate-cell membrane interaction and application thereof.The present application modifies manganese mineralized black phosphorus nanomaterial by bio-inspired polymer pGluCP adsorption, which retains the excellent biocompatibility and photothermal performance of BP, and at the same time, pGluCP enhances the 'chassis' effect of the material, captures tumor-related antigens, and can simultaneously capture water-soluble antigens and water-insoluble membrane antigens and form pathogen-like micro-nanoparticles, which is helpful for antigen delivery and APC presentation, and provides a feasible tool for capturing non-water-soluble membrane antigens, which is a major challenge.MnBP and pGluCP synergistically act, and can realize the personalized conversion of autologous tumors to vaccine production and delivery.

This invention discloses a method for determining the surface charge density of micro / nano particles. The method first uses light scattering technology to determine the critical agglomeration concentration of micro / nano particles at a given electrolyte type and temperature. Then, under this concentration condition, the resultant force of electrostatic repulsion and long-range molecular attraction between particles is calculated, and the particle surface potential under this condition is determined. Finally, the surface charge density of the particles is obtained based on the obtained surface potential. This invention can accurately calculate the surface charge density of micro / nano particles by determining the critical agglomeration concentration using a laser scattering instrument, eliminating the need to separately measure the outer surface area of ​​the particles in a gaseous medium and the number of surface charges in a liquid medium before calculating the surface charge density.

The invention provides a multi-dynamic-bond cross-linked organic silicon resin, a multifunctional low-surface-energy anti-icing and deicing coating composition and a preparation method of the multi-dynamic-bond cross-linked organic silicon resin and the multifunctional low-surface-energy anti-icing and deicing coating composition. The finishing paint is also prepared by mixing the organic silicon resin serving as a resin matrix with the modified photo-thermal micro-nano particles. The coating composition can endow a base material with excellent photo-thermal conversion performance and super-hydrophobic performance, does not influence the original mechanical property and use performance of the base material, and can effectively solve the problems of insufficient mechanical stability and poor environmental adaptability of a super-hydrophobic coating in the prior art. And the requirements of fluoride-free environmental protection, stable anti-icing / deicing and long-term service on the coating material are met.

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.

The invention discloses a method for preparing a high-protein solution from hydrophobin through membrane treatment and ultrasonic assistance, and belongs to the technical field of food protein modification and membrane separation. The preparation method comprises the following steps: dispersing hydrophobic protein in an alkaline solution, adding maltodextrin into the alkaline solution, carrying out multiple times of concentration and dilution operation through membrane treatment to remove salt ions and macromolecular aggregates, and then adjusting the pH value of a solution system to be neutral by adopting an acidic solution; the preparation method comprises the following steps: firstly, preparing a solution, then treating the solution under the ultrasonic action to form a micro-nano particle structure with good colloidal stability, and finally, concentrating and drying to obtain powdery protein with high solubility. The soluble protein powder obtained by the invention can be widely applied to vegetable protein drinks, nutritional formula foods and functional foods.

The invention discloses a degradable macroporous composite tissue engineering scaffold, a structural performance regulation and control method and application, and belongs to the technical field of biomedical materials. Induced phase separation is realized through design of gel molecules and a solvent, so that a macroporous structure is formed; the pore structure is adjusted by controlling the proportion of the polyvinyl alcohol aqueous solution, the glycerol and the hydrophilic degradable biomacromolecule aqueous solution; the mechanical property of the stent is regulated and controlled by adding the degradable inorganic micro-nano particles; meanwhile, a pore structure and a scaffold material with spatial heterogeneity in mechanical property are constructed through hot melt interface integration. The problems that an existing tissue engineering scaffold is insufficient in controllability of a pore structure and mechanical properties and the like are solved, and the degradable macroporous composite tissue engineering scaffold material is suitable for being used as a degradable macroporous composite tissue engineering scaffold material for promoting collaborative injury repair of soft and hard tissues such as osteochondral tissues, muscular bones and tendon bones.

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.

The invention discloses an acid-blocking and plate-breaking high-activity ecological functional organic fertilizer as well as a preparation method and application thereof, and belongs to the technical field of organic fertilizers. The preparation method of the acid-blocking and plate-breaking high-activity ecological functional organic fertilizer comprises the following steps: firstly, preparing magnesium-carbon ultrafine powder and activated mineral powder, fermenting the activated mineral powder and mixed manure to obtain mineral compost, mixing a part of the mineral compost with the magnesium-carbon ultrafine powder to obtain a magnesium-carbon ultrafine powder coated mixture, and carrying out acid-blocking and plate-breaking treatment on the magnesium-carbon ultrafine powder coated mixture to obtain the acid-blocking and plate-breaking high-activity ecological functional organic fertilizer. Cake fertilizer, bio-sugar and ecological microbial inoculum are added into other mineral compost for culture, bio-organic fertilizer is obtained, the magnesium-carbon ultrafine powder coated mixture is mixed with the bio-organic fertilizer, and the acid-blocking plate-breaking high-activity ecological functional organic fertilizer is obtained. According to the preparation method disclosed by the invention, a superfine and microcrystal activation processing technology is utilized, micro-nano particles are formed, the bioavailability of the fertilizer is improved, the prepared product has comprehensive functions of improving the structure, neutralizing acidity, supplementing nutrients and biologically preventing and controlling the acid soil, and the aims of reducing the amount of the chemical fertilizer, blocking acid and breaking the plate, improving the soil fertility, increasing the yield and improving the quality are fulfilled.

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 invention belongs to the technical field of medicine, and particularly relates to application of glycin in preparation of medicine for treating aortic valve calcification, micro-nano particles and a preparation method of the micro-nano particles, the micro-nano particles are of a core-shell structure, the core of the micro-nano particles is a glycin-loaded gel microsphere formed by hyaluronic acid methylacrylate through photo-crosslinking, and the core of the micro-nano particles is a chitosan microsphere formed by hyaluronic acid methylacrylate through photo-crosslinking. The shell covers the outside of the core and is formed by crosslinking calcium alginate ions; the particle size of the micro-nano particles is 90 to 110 [mu] m. According to the preparation method disclosed by the invention, a micro-fluidic chip technology is mainly adopted, and photo-crosslinking and ionic crosslinking are combined, so that the finally obtained GG-HAMA at SA has the characteristic of antagonizing aortic valve calcification.

The application discloses a marine lifesaving suit, which comprises a lifesaving suit body with functions of inflation and heating, the lifesaving suit body comprises a hydrophobic outer layer and a skin-friendly and breathable inner layer; the hydrophobic outer layer is composed of a waterproof cloth with micro-nano particles deposited on the outer surface, the micro-nano particles have a core-shell structure with different axes, wherein the core layer is composed of a jellyfish repellent, the shell layer is composed of an adhesive, the jellyfish repellent is elemental sulfur or a mixture of elemental sulfur and lanthanum chloride, and the shell layer covers 10-60% of the peripheral surface area of the core layer. Experimental results show that the micro-nano particles can significantly inhibit the emission of jellyfish nematocysts and have a repellent function of protecting against jellyfish stings, so that the marine lifesaving suit can solve the problems of cold water frostbite, drowning in seawater and jellyfish stings that may be suffered by personnel immersed in seawater, and has significant application value.

The application discloses a kind of based on the acoustic holography technology's microparticle composite material sound auxiliary manufacturing device and method.Acoustic control module and mixed liquid container lifting mechanism are fixed in water tank inner bottom surface, mixed liquid container lifting mechanism is equipped with mixed liquid container, for accommodating mixed liquid containing microparticle, acoustic control module is set in the lower side of mixed liquid container, for projecting ultrasonic wave to mixed liquid container, to control the spatial arrangement of microparticle in mixed liquid;Layer-by-layer solidification platform lifting mechanism is set to one side of water tank, layer-by-layer solidification platform is installed on layer-by-layer solidification platform lifting mechanism, layer-by-layer solidification platform is set opposite to mixed liquid container, solidification light source is set to mixed liquid container, for the light curing of mixed liquid in mixed liquid container.The application effectively combines acoustic holography technology and 3D printing technology, can arrange microparticle in precursor liquid in the process of material layer-by-layer solidification, and manufacture composite material with arbitrary three-dimensional structured microparticle arrangement.

The invention discloses a high-rate and high-safety paper-based lithium ion battery diaphragm as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery diaphragms. The lithium battery diaphragm is composed of paper, cellulose ester and inorganic micro-nano particles. Paper pulp fibers serve as raw materials, paper is prepared through a wet process, and then one face or two faces of the paper is / are coated with an inorganic micro-nano particle / cellulose ester solution to prepare the high-magnification lithium ion battery diaphragm. The high-rate and high-safety lithium ion battery diaphragm disclosed by the invention has excellent thermal dimensional stability, electrolyte wettability, stable high-rate cycle performance and high-temperature closed-cell cycle performance, and has huge application potential in the field of lithium ion batteries.

The invention discloses a particle composite material sound-assisted manufacturing device and method based on an acoustical holography technology. The acoustic control module and the mixed liquid container lifting mechanism are both fixed to the inner bottom face of the water tank, a mixed liquid container is installed on the mixed liquid container lifting mechanism and used for containing mixed liquid containing particles, and the acoustic control module is arranged under the mixed liquid container and used for projecting ultrasonic waves into the mixed liquid container. Therefore, the spatial arrangement of particles in the mixed liquid is controlled; the layer-by-layer curing platform lifting mechanism is arranged on one side of the water tank, the layer-by-layer curing platform is installed on the layer-by-layer curing platform lifting mechanism, the layer-by-layer curing platform is arranged right opposite to the mixed liquid container, and the curing light source is arranged towards the mixed liquid container and used for conducting light curing on mixed liquid in the mixed liquid container. According to the method, the acoustical holography technology and the 3D printing technology are effectively combined, micro-nano particles in the precursor solution can be randomly arranged in the layer-by-layer curing process of the material, and the composite material with any three-dimensional structured particle arrangement is manufactured.

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 invention relates to the field of well drilling, and discloses a plugging agent, plugging slurry and application thereof. The blocking agent comprises micro-nano particles, the microtopography of the particles comprises at least two of a spherical shape, a rod shape and a sheet shape, and at least one of the particles comprises oleophylic groups distributed on the surface. The plugging agent disclosed by the invention has the advantages of good particle dispersity, high compatibility with the drilling fluid, good thermal stability, long service life, low price of raw materials and easiness in obtaining, and is particularly suitable for being used as an additive of the oil-based drilling fluid. The plugging slurry prepared by using the plugging agent provided by the invention can effectively reduce the filter loss (maximally reduced by 72.4%), has an excellent plugging effect on various types of micro-gaps, effectively inhibits shale pore pressure transmission, strengthens the well wall, overcomes the problem of well wall instability caused by drilling fluid invading into the micro-gaps, and has a good plugging effect on various types of micro-gaps. And the safety of drilling operation is greatly improved.

The invention provides application of ultrafine nanoparticles derived from human umbilical cord mesenchymal stem cells in preparation of a medicine for preventing and / or treating diseases caused by nerve cell injury, and belongs to the technical field of biological medicines. The invention provides an application of human umbilical cord mesenchymal stem cell (ucMSC-supermers) in preparation of a medicine for preventing and / or treating diseases caused by nerve cell injury, and particularly provides an application of the human umbilical cord mesenchymal stem cell (ucMSC-supermers) in preparation of the medicine for preventing and / or treating the diseases caused by the nerve cell injury. As novel non-membranous extracellular nanoparticles, the mesenchymal stem cell-derived ultramicro nanoparticles are small in particle size, are not wrapped by a membranous structure, have stronger tissue penetrating power and higher cellular uptake efficiency, enrich bioactive substances with higher abundance, can efficiently promote axonal regeneration, and can be used for preparing a novel non-membranous extracellular nanoparticle. The effect of promoting nerve regeneration and repair is obviously better than that of the HucMSC-sEV under the same condition, and the treatment effect on traumatic diseases of the central nervous system is effectively improved.

The invention discloses a preparation method of a black ceramic pigment and the black ceramic pigment prepared by the method. Comprising the steps of Fe-Cr-Co-Ni mixed solution preparation, PH value adjustment, hydrothermal reaction and drying. According to the method, the micro-nano particles can be prepared at a low temperature, compared with a solid phase method, the method has the great advantage in the aspect of energy consumption, the size is uniform, impurities are few, crystallinity is good, and the requirement of ceramic ink-jet printing can be met.

The invention discloses application of elemental sulfur as a jellyfish repellent. According to the application, micro-nano particles formed by single elemental sulfur are used as an effective component of the jellyfish repellent. Experimental results show that the jellyfish repellent disclosed by the invention not only can be used for remarkably inhibiting nematocyst emission of jellyfish, but also has good slow release property and hydrophobic property; the compound is expected to be used as an effective component for preparing a skin care product which is directly smeared on the skin to prevent jellyfish stings and for preparing a protective coating of a wearing article for preventing jellyfish stings. In addition, the jellyfish repellent also has the advantages that the raw materials are easy to obtain, the jellyfish repellent is easy to prepare and obtain, environment-friendly and the like, and has a wide application prospect.

The invention belongs to the technical field of agricultural bio-based slow-release carriers and pesticide preparations, and relates to lignin-based pesticide controlled-release micro-nano particles with multiple stimulus responses and a preparation method thereof.The preparation method comprises the steps that lignin and dopamine hydrochloride are dissolved in a buffer solution in proportion, an oxidizing agent is added into the buffer solution, the mixture is stirred to react, and the lignin-based pesticide controlled-release micro-nano particles with multiple stimulus responses are obtained; the lignin-polydopamine composite solution is dialyzed and purified in water, and lignin-polydopamine solid powder is obtained after the lignin-polydopamine composite solution is dried; lignin-polydopamine solid powder and abamectin amine are mixed and dissolved in an organic solvent according to the mass ratio of (1-5): 1, then water is added in several times, stirring is conducted at the same time, the polarity of a system is changed, micro-nano drug-loaded particles of lignin-polydopamine entrapped abamectin are separated out, the micro-nano drug-loaded particles are dried, and then the lignin-polydopamine entrapped abamectin drug-loaded particles are obtained. The abamectin delivery system disclosed by the invention has multiple environmental responsiveness, a long-acting foliar adhesion function and a controllable release characteristic.

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.

The invention discloses a micro-nano sheet structure welding device and method based on laser melting and ultrasonic regulation and control, and belongs to the technical field of micro-nano material processing and manufacturing. The problems that in the liquid phase preparation and reconstruction process, micro-nano particles are driven by the minimum interface energy to naturally tend to be spherical, and isolated spherical particles are difficult to spontaneously assemble into a sheet structure under the template-free condition are solved. The underwater acoustic transducer device specifically comprises a laser assembly, an underwater acoustic transducer device assembly and a reaction container assembly. A micro-nano particle solution is contained in the reaction container assembly; a laser assembly is arranged above the reaction container assembly, the laser assembly emits pulse laser into the reaction container assembly, and the micro-nano particles enter a molten state after absorbing the pulse laser. The underwater acoustic transducer device assembly generates an ultrasonic standing wave field, and the ultrasonic standing wave field provides stable acoustic radiation force distribution to enable the liquid micro-nano particles to evolve towards the direction of the sheet structure to form the directionally arranged sheet structure, so that controllable control of the form of the micro-nano material is realized.

This invention discloses a jellyfish repellent and its applications. The active ingredient of the jellyfish repellent contains micro / nano particles formed from elemental sulfur or micro / nano particles formed from a mixture of elemental sulfur and lanthanum chloride. Experimental results show that the jellyfish repellent of this invention not only significantly inhibits the emission of nematocysts from jellyfish, but also possesses good sustained-release and hydrophobic properties. It is expected to be used as an active ingredient in the preparation of skin care products for direct application to prevent jellyfish stings and as a protective coating for wearables to prevent jellyfish stings. Furthermore, the jellyfish repellent of this invention has advantages such as readily available raw materials, ease of preparation, and environmental friendliness; therefore, the jellyfish repellent of this invention has broad application prospects.

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 invention relates to the technical field of high-speed particle impact testing, and discloses a device and method for accelerating micro-nano particles to supersonic speed for impact testing, the device comprises a high-pressure pump, a high-pressure guide pipe is installed in the water pumping end of the high-pressure pump in a penetrating manner, and a high-pressure calandria is installed in the water drainage end of the high-pressure pump in a penetrating manner; and a heating box pool is fixedly installed on one side of the high-pressure pump, heating pipe fittings are fixedly installed in the heating box pool, and a pressure pump is installed at the top of the heating box pool in a penetrating mode. The high-pressure guide pipe at the water pumping end of the high-pressure pump and the interior of the purification box are installed in a penetrating mode, then particles are subjected to secondary high-pressure acceleration through the high-pressure pump, then the particles are discharged into the supersonic spraying pipe through the high-pressure discharging pipe, and interference of liquid phase relative impact can be eliminated; the characteristics of high pressure and high flow can be achieved through high-pressure pumping, secondary acceleration can be conducted on particles in the evaporation process, the speed bottleneck of a traditional jet device can be broken through, and the particles are accelerated to 600 m / s or above.

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.