17 results about "Anisotropic growth" patented technology

The invention relates to the technical field of composite functions, in particular to a NiCo2O4 nanosheet array modified expanded graphite heat storage-wave absorption integrated material and a preparation method thereof. According to the invention, an EG surface functional group is innovatively used as a nucleation site, and a precursor is guided to carry out anisotropic growth and oriented self-assembly in a limited space through a hydrothermal reaction, so that a precursor with a specific morphology (rod cluster shape) is formed; and through topological conversion, the NiCo2O4 nanosheets are firmly and uniformly converted into the honeycomb NiCo2O4 nanosheet array on the EG skeleton. The in-situ growth strategy ensures that strong chemical combination and tight physical contact are formed between the functional nano material and the conductive skeleton, and skeleton-absorbent function integration is realized. And the subsequent vacuum impregnation process further realizes directional transportation and spatial confinement solidification of the phase change material in the graded pore channel through interface energy gradient and capillary acting force, and finally, precise compounding and efficient cooperation of the'heat storage-wave absorption 'dual functions on the micro-scale are completed.

The application discloses a method for preparing non-spherical nano-silica particles by self-assembly induction, which comprises synthesis of silica particle seeds and further growth of the seeds: by preparing monodispersed seed particles, trace amounts of amphoteric electrolytes are added into the seed growth solution to induce anisotropic growth of the seeds, the types and proportions of the electrolytes are adjusted to make the monodispersed seeds generate silica sol of non-spherical silica particles with different morphologies, and then a series of post-treatments such as water replacement solvent, filtration and concentration are conducted to obtain non-spherical ultra-high-purity silica sol with a mass fraction of more than 18%, a primary particle size of 40-80 nm and a morphology of peanut-shaped, short-chain-shaped and long-chain-shaped, etc. The application also relates to the non-spherical ultra-high-purity silica sol and application thereof in CMP. The preparation method of the application adopts a self-assembly mode of monodispersed seeds to prepare non-spherical particles, and the particle morphology can be further adjusted by adjusting the dosage or types of the self-assembly induction agent.

The invention provides a Fe-Co-Ni series nano-alloy and a preparation method and application thereof, and belongs to the technical field of functional materials. The alloy is prepared by the following steps of: weighing and proportioning 0.5 mmol of each element by taking chlorate or acetylacetonate or acetate of iron, cobalt, nickel, manganese, copper, zinc and the like with the purity of more than 99.5% and other metal chlorides which are rich in earth surface and economical and practical as precursors, putting the precursors into a pressure-resistant bottle, taking n-trioctylphosphine oxide (TOPO) as a ligand, taking ethanol and 1-octadecene (ODE) as a mixed solvent, and uniformly stirring to prepare the alloy. And synthesizing the hexagonal nano-alloy at low temperature by using a wet chemical method. The method can be used for synthesizing 3-10-element medium-entropy and high-entropy alloy, and has a wide application prospect. The synthesis is a precise process which is guided by an organic ligand, is coordinated by multiple metals and is subjected to nucleation-self-assembly-anisotropic growth.

The invention relates to the technical field of preparation of new materials, in particular to a hexaaza-naphthyl polymer nanosheet / rod array composite material as well as preparation and application thereof. The preparation method comprises the following steps: dissolving a substrate material and a catalyst, and uniformly mixing to obtain a mixture; sequentially adding an amine monomer and a ketone monomer into the mixture, and uniformly mixing to obtain a reaction mixed solution; and finally, transferring the reaction mixed solution into a reaction kettle, and carrying out condensation polymerization to obtain the hexaaza-naphthyl polymer nanosheet / rod array composite material. The hexaaza-naphthyl polymer nanosheet / rod array composite material (with high specific surface area, rapid mass transfer path and clear and rich active sites) with a controllable structure is successfully prepared by a simple and efficient solvent-mediated interface anisotropic growth method; according to the method provided by the invention, the utilization rate of active sites can be increased, the conductivity is improved, and the method has wide application potential in the fields of energy, environment and cultural relic protection such as batteries and electro-catalysis.

The invention discloses a preparation method of a copper-based metal organic framework (MOF) material capable of realizing SO2 capture through adjustment of different unit acids, monobasic acids (nitric acid (HNO3), formic acid (FA) and benzoic acid (BA)) are adopted as regulators, and anisotropic growth is realized through systematic regulation of crystal growth kinetics, so that MOF materials with different morphological characteristics are successfully prepared. Experimental results show that the gas adsorption performance of the material can be remarkably improved through the morphology control strategy. The research not only provides a new design thought for developing a material for selectively adsorbing characteristic components (such as SO2) of SF6 decomposed gas, but also realizes optimization of material performance through accurate regulation and control of MOF morphology, and has a great significance in guaranteeing safe operation of power equipment, preventing aging of an insulating material, prolonging the service life of the equipment, protecting the environment and assisting the realization of a dual-carbon target. The method has important scientific significance and engineering application value.

The invention relates to a preparation method of an oriented molecular sieve membrane for hydrogen separation. According to the technical scheme, a high-activity nano molecular sieve is selected as a seed crystal, a transparent and uniform molecular sieve membrane secondary growth solution is selected, and the oriented molecular sieve membrane with crystals in highly ordered arrangement along a specific crystal face direction is prepared. The preparation method has the beneficial effects that the nano molecular sieve has relatively high surface energy, so that the nano molecular sieve can be easily adsorbed on the surface of a substrate; the nano molecular sieve has an undefined crystal face direction so as to induce anisotropic growth of crystals, has the characteristics of small size, high specific surface area and high-density arrangement so as to provide abundant active sites for simultaneous growth of a large number of crystals, and enables adjacent crystals to be very easy to contact so as to generate competitive growth; and the condition of triggering a Van der Drift growth evolution mechanism is met. In addition, the nano molecular sieve seed crystal has high activity, so that the difference of crystal growth rates in different directions is more obvious, and the oriented growth driven by the evolution theory is further promoted. And finally, the crystals are arranged according to the preferential orientation to form a top layer, and the specific preferential orientation is shown. The oriented molecular sieve membrane prepared by the invention is simple in preparation method and excellent in H2 separation performance, and has a wide application prospect in the fields of recycling hydrogen from synthesis gas and refinery gas and the like.

The invention discloses light magnetic control terahertz protective aerogel as well as a preparation method and application thereof, and particularly relates to the technical field of terahertz protective materials. Comprising the following steps: (1) adding a metal salt, an alkaline reagent and a stabilizer into an organic reagent, uniformly stirring and mixing, and adding a reducing agent to obtain a mixed solution; (2) in a gradient magnetic field, placing the mixed solution in a water bath for reaction to obtain wet gel; and (3) washing the wet gel obtained in the step (2) with a gradient alcohol-water solution, and drying to obtain the product. The'magnetic field 'and the'heat treatment' are synchronously carried out in a reaction container. The magnetic field penetrates through the whole process of metal ion reduction, nucleation, growth and assembly. Due to the synergistic effect, anisotropic growth of the nanowires can be effectively regulated and controlled, the nanowires are promoted to form long chains in an end-to-end connection mode, and finally the oriented metal aerogel is constructed; the cost effectiveness is improved, the flexibility is higher, large-area samples can be prepared, the energy consumption is lower, and the environmental protection property is improved.

The invention relates to an interlocking microstructure silicon carbide ceramic formed by slender crystal grains and a preparation method thereof, and belongs to the technical field of ceramic materials. According to the method, alpha-SiC powder is used as a main raw material, and a certain proportion of perhydropolysilazane (PSZ) which is not subjected to crosslinking, curing or pretreatment is added to prepare ceramic composite powder. Then, spark plasma sintering is carried out under specific conditions, and the dense SiC ceramic with the interlocking microstructure formed by the long and thin crystal grains is obtained. In the sintering process, the stability of the alpha-SiC polymorph can be regulated and controlled by trace nitrogen elements generated by pyrolysis of all-hydrogen PSZ, and grains are induced to anisotropically grow along a specific crystal orientation, so that an interlocking microstructure is formed. The structure can influence the fracture toughness of the material through mechanisms such as crack deflection and bridging, so that the self-toughening of the ceramic material is realized.

The invention provides monodisperse spherical micro-nano silver powder and a preparation method thereof, and belongs to the technical field of metal powder preparation. The silver nitrate solution is used as a silver source, polyvinylpyrrolidone is used as a dispersing agent, ascorbic acid is used as a reducing agent, and the micro-nano silver powder which is narrow in particle size distribution and high in sphericity degree is prepared at the low temperature. The kinetics of hydrolysis and reduction nucleation are effectively slowed down at low temperature, thermal motion of a polyvinylpyrrolidone molecular chain is weakened, the polyvinylpyrrolidone molecular chain can be more orderly and stably adsorbed on a specific crystal face of a silver crystal nucleus, anisotropic growth of the crystal nucleus is inhibited, low-temperature Ostwald ripening among particles is also effectively prevented, and uniformity of the particle size is guaranteed; at a low temperature, the reducing ability of ascorbic acid is moderated. The'mild reduction 'is perfectly matched with the'ordered guiding', so that good balance between reaction kinetics and thermodynamics is realized. And the prepared silver powder is excellent in morphology, ultrahigh in sphericity degree and good in monodispersity, and can be applied to high-end electronic paste.

The invention discloses a method for realizing controllable synthesis of polyhedral cuprous oxide based on sound wave temperature control, which comprises the following steps: (1) preparation of a mixed solvent, (2) preparation of a temperature control environment, (3) preparation of a mixed ligand complex precursor, (4) sound wave reaction, and (5) washing and drying of a material. A mixed ligand complex system formed by common coordination of acetate, ethylene glycol molecules and water molecules slowly releases Cu < 2 + >, and the anisotropic growth rate of the crystal can be controlled to induce huge development of the morphology of pure-phase cuprous oxide through differential extreme temperature differences between local high temperature and different temperature environments by virtue of an ultrasonic cavitation effect. The method has the characteristics of low raw material cost, simple equipment, environmental friendliness and the like, the synthesis process is simple, convenient, feasible and highly controllable, Cu < 2 + > is slowly released skillfully based on a mixed ligand complex system, the difference extreme temperature difference between the local high temperature and the external environment of the ultrasonic cavitation effect is utilized, and the method is suitable for industrial production. The controllable development of the pure-phase cuprous oxide polyhedral morphology is successfully realized, and the diversity of the material in the aspects of morphology design and structure regulation and control is expanded. The material has a wide application prospect in the aspect of functional material development in the field of clean energy.

The application provides monodisperse spherical micro-nano silver powder and a preparation method thereof, and belongs to the technical field of metal powder preparation. The application uses silver nitrate solution as a silver source, polyvinylpyrrolidone as a dispersant, and ascorbic acid as a reducing agent to prepare micro-nano silver powder with narrow particle size distribution and high sphericity at low temperature. The kinetics of hydrolysis and reduction nucleation is effectively slowed down at low temperature, the thermal motion of polyvinylpyrrolidone molecular chains is weakened, the polyvinylpyrrolidone molecular chains can be more orderly and stably adsorbed on specific crystal faces of silver crystal nuclei, the anisotropic growth of crystal nuclei is inhibited, and the low-temperature Ostwald ripening between particles is effectively prevented, so that the uniformity of particle size is ensured; at low temperature, the reduction capacity of ascorbic acid is moderated. The'mild reduction' and 'ordered guidance' are perfectly matched, and a good balance between reaction kinetics and thermodynamics is achieved. The prepared silver powder has excellent morphology, super-high sphericity and good monodispersity, and can be applied to high-end electronic paste.

The invention discloses a two-dimensional bismuth nanosheet and a preparation method and application thereof, and belongs to the technical field of two-dimensional material preparation.In the preparation method of the two-dimensional bismuth nanosheet, the interface redox reaction of ice and metal serves as the core, Bi < 3 + > in ice formed by a Bi < 3 + > solution provides an oxidizing agent, and a metal sheet provides a reducing agent; an ice-metal interface redox system is constructed only by the simple operation of dripping a Bi < 3 + > solution on the surface of a metal sheet at a low temperature, the release migration, the reaction rate and the growth direction of ions are modulated by the low temperature and a limited space, and bismuth is subjected to dynamic controlled nucleation and anisotropic growth in a two-dimensional direction, so that the bismuth nanosheet with a two-dimensional morphology is obtained.

The invention relates to the technical field of printed circuit manufacturing, and discloses a manufacturing process of a high-density circuit board printed circuit, which comprises the following steps of: coating organosilane bridging molecules with polydentate coordination functional groups on the surface of an insulating base material to form a self-assembled chemical anchoring layer; laser energy field graphical scanning is utilized to establish a silicon-oxygen covalent bond in a scanned area, and a graphical activation area is constructed; applying an external cleaning energy field of which the action energy level is between physical adsorption energy and chemical bond energy, and removing residual molecules in a non-scanning area; catalytic metal ions are introduced into the pattern active region, and a chelating center is established by using a polydentate coordination functional group so as to lock a nucleation site; according to the method, atomic-scale surface purification is achieved through a bond energy differentiation response mechanism, the potential electromigration hazard of a non-operation area is eliminated, metal nucleation displacement is limited through cooperation of a chelating structure, the problem of edge blurring of a superfine circuit is solved, and the thermal mechanical robustness of the circuit is improved.

The invention discloses a non-spherical nano silicon dioxide sol and a preparation method and application thereof, and the method comprises synthesis of silicon dioxide particle seed crystal and further growth of the seed crystal: preparing monodispersed seed crystal particles, and adding a trace of amphiphilic nonionic multi-block copolymer into a seed crystal growth solution to assist anisotropic growth of the seed crystal, so as to obtain the non-spherical nano silicon dioxide sol. The method comprises the following steps: adjusting the proportion and dosage of amphipathic nonionic multi-block copolymer groups, so that monodispersed seed crystals generate silica sol of non-spherical silicon dioxide particles with different morphologies, and the amphipathic nonionic multi-block copolymer has hydrophilic groups for capturing and positioning silicon dioxide; and the hydrophobic group improves the stability of the non-spherical silica sol product, and the non-spherical silica sol is not easy to agglomerate. The mass fraction is more than 15%, the primary particle size is 30-70nm, and the non-spherical ultra-high-purity silica sol is peanut-shaped, short-chain-shaped, long-chain-shaped and the like. The invention further relates to the non-spherical ultra-high-purity silica sol and application of the non-spherical ultra-high-purity silica sol in CMP.

This invention discloses a method for preparing noble metal-based ultrafine nanowire catalysts, belonging to the field of nanomaterial synthesis and controlled growth technology. The method includes: dissolving a noble metal and a second metal precursor in a high-boiling-point organic solvent; introducing a gas containing carbon monoxide into the liquid-phase reaction system, utilizing the dynamic adsorption-desorption equilibrium established by carbon monoxide on the surface of the growing nanocrystals to selectively inhibit radial growth of the nanocrystals and induce their one-dimensional anisotropic growth, forming an ultrafine nanowire structure. This invention, by precisely controlling parameters such as gas partial pressure and reaction temperature, can stably prepare ultrafine nanowires with an average diameter of less than 3 nm, and can achieve atomic-level homogeneous alloying of macroscopically immiscible metal systems such as Pt-Ru through kinetic control strategies. This method is simple, highly controllable, and provides an effective route for the large-scale preparation of high-performance noble metal-based one-dimensional nanocatalysts.

The invention discloses a preparation method of flower-like nano-silver particles, which comprises the following steps: preparing a mixed aqueous solution of ascorbic acid and a surfactant, heating and stirring; preparing a silver nitrate aqueous solution, heating and stirring; and dropwise adding the silver nitrate aqueous solution into the mixed aqueous solution at the rate of 10-35 mL / min, and continuously reacting for 5-10 minutes after dropwise adding is finished, so as to obtain the flower-shaped nano-silver particles. The method is simple in process operation, the reaction is carried out in a water phase at normal pressure and medium temperature, ascorbic acid is used as a reducing agent, toxic solvents are avoided, complicated equipment (such as vacuum and laser) is not needed, the method is green and environment-friendly, and controllable growth of flower-like morphology is finally formed by controlling anisotropic growth of silver crystals; and flower-like nano-silver particles with uniform morphology and high purity are prepared under mild conditions by a one-step method.

This invention belongs to the field of anti-corrosion materials technology, and specifically relates to an anti-corrosion material, its preparation method, and its application. The anti-corrosion material of this invention includes a substrate and an anti-corrosion layer located on the surface of the substrate. The anti-corrosion layer comprises polyisobutylene, butyl rubber, petroleum resin, and a first filler. The first filler includes basic magnesium stearate-calcium complex salt and serpentine precursor. Upon contact with water, the first filler undergoes a crystallization reaction to generate hydrate crystals with anisotropic growth characteristics, producing sufficient crystallization growth stress to fill microscopic gaps, thus blocking the crevice corrosion pathway at its source and achieving excellent anti-corrosion effects. Simultaneously, the synergistic effect between the first and second protective layers solves the problem of traditional anti-corrosion methods being unable to protect irregularly shaped structural gaps, offering advantages such as convenient construction, reliable protection, and long-term self-adaptive properties, fundamentally eliminating crevice corrosion.