32results about How to "Promote in situ growth" patented technology

The invention provides a layered double hydroxide composite nano-filtration membrane and a preparation method thereof, and relates to the technical field of membranes. The composite nano-filtration membrane is obtained by modifying to generate a polydopamine functional layer on a base membrane firstly, and then constructing a double hydroxide functional cortex on the surface of a polydopamine-modified membrane in situ. Functional groups of a polydopamine-modified layer can improve the hydrophilcity, the permeability, the selectivity and the anti-pollution performance of the membrane, and can interact with a metal salt precursor, so as to promote the deposition and in-situ growth of the precursor on the surface of the membrane; the double hydroxide layer which is generated in an auxiliary manner is distributed uniformly, has stronger acting force with the base membrane, and is beneficial to the stability of the performance of the membrane. The construction of the double hydroxide functional cortex can be regulated and controlled effectively, which is beneficial to improving the water flux, the hydrophilcity and the chlorine resistance of the membrane. The overall preparation processhas the advantages of mild conditions and convenient operation; the composite nano-filtration membrane with excellent comprehensive performance is obtained, and has the prospect of industrial production and commercial application.

The present invention provides a dual-functional Co 1‑x S-MoS 2 ‑Nitrogen-doped carbon ternary composite material preparation method. Cobalt precursor arrays grown on carbon paper substrates were first obtained by chemical bath deposition, followed by oxidation and sulfidation to obtain cubic phase Co 9 S 8 array of nanorods. Dissolve molybdenum salt, bipyridine or o-phenanthroline, and carbon source in N,N-dimethylformamide solution to obtain Mo 5+ ‑N‑C precursor solution, and then apply the precursor solution until the growth of Co 9 S 8 On the substrate of the array structure and dry; with argon or nitrogen as the protective gas and carrier gas, and the liter S elemental powder as the solid evaporation source, the chemical vapor deposition reaction can obtain the hexagonal phase Co 1‑x S and MoS 2 and NC complex arrays. The product obtained by the technical scheme of the present invention has many advantages such as low equipment requirements, low cost of required raw materials, easy control of reaction conditions, simple production process, good consistency of formed products, and low environmental pollution, and can be used in multiple applications of HER and OER. Functional electrocatalysts.

The invention discloses a whisker-reinforced zirconia planting integrated crown, which comprises a whisker-reinforced zirconia matrix, the center of the whisker-reinforced zirconia matrix is ​​provided with a longitudinally through screw hole, and the whisker-reinforced zirconia The zirconium matrix is ​​composed of the upper crown of the implant, the transgingival part and the connecting part for connecting the implant from top to bottom; the material of the whisker-reinforced zirconia matrix is ​​whisker-reinforced zirconia, and the whisker-reinforced zirconia The raw materials of strong zirconia include main materials and additives, the main materials are composed of 80-99% zirconia and whiskers 1-20% by mass percentage, and the additives include: superfine Nano-alumina powder 0.1-1%, ultra-fine nano-silica powder 0-0.1%. The invention can not only meet the requirements of aesthetic performance, but also meet the requirements of mechanical strength similar to the one-piece crown made of titanium metal, meanwhile, the surface roughness can be controlled, and it has good biological activity and biocompatibility.

A method for preparing ultra-large sheet RGO loaded ultrafine β-FeOOH nanoparticles lithium-ion battery negative electrode material, dispersing graphene oxide in deionized water to obtain suspension A; adding a certain amount of soluble salt, sodium chloride and urea Add absolute ethanol and deionized water, and then mix with suspension A to obtain suspension B; pour suspension B into a homogeneous hydrothermal reaction kettle, then seal the reaction kettle, and put it into a homogeneous hydrothermal reaction kettle. After the hydrothermal reaction in the reactor, naturally cool to room temperature to obtain product C; wash product C with water and alcohol respectively, and disperse the washed product in water to obtain product D; freeze-dry product D to obtain RGO large sheet-loaded ultrafine β ‑FeOOH nanoparticle lithium-ion battery negative electrode material, the present invention uses composite graphene, particle size reduction method to improve the performance of β‑FeOOH, can provide more electrochemical active sites and ion transport channels, thereby improving the reversible capacity of the battery . 5000mA g ‑1 The lower reversible capacity exceeds 1000mAh g ‑1 , is a very potential lithium battery negative electrode material.

The invention discloses an aramid composite diaphragm based on in-situ modification and a preparation method thereof, comprising a diaphragm base film and an aramid composite coating coated on one side or both sides of the base film, the base film is a poly Olefin porous membrane, the aramid composite coating is coated with aramid nanofibers modified in situ with functional nanoparticles, and the functional nanoparticles are iron oxide, tungsten oxide, molybdenum disulfide or ZIF‑67 kind of. The aramid composite separator has good thermal stability and mechanical stability, and is applied in lithium-sulfur batteries, which can accelerate redox reaction and lithium ion transmission rate, and at the same time, it can well adsorb polysulfides and inhibit the shuttle of polysulfides , improve the cycle performance and rate performance of the battery, and enhance the thermal stability and safety performance of the battery.

The invention relates to a method for in-situ growth of silicon carbide nanowires by impregnating and cracking method of non-catalyzed precursors, in which PCS and xylene mixed solution is impregnated into SiC W In the preform, cure at 200°C for 1 hour, and crack porous SiC at 900-1100°C for 2 hours W / SiC; 3. Porous SiC W / SiC heat treatment: the porous SiC W / SiC is heat treated at 1300-1500°C for 2 hours, and the "two-step method" refers to immersion, curing, cracking and heat treatment. The present invention uses solidification and cracking to first remove the unnecessary gas phase for growing SiCNWs, and then uses heat treatment to release the necessary gas phase for growing SiCNWs, and at the same time utilizes SiC W The two-stage pore structure of the preform greatly increases the supersaturation of the necessary gas phase, thereby realizing the PIP non-catalytic in situ growth of SiCNWs.

A preparation method of a NaCl-modified graphene net-coated Beta-FeOOH lithium ion battery negative electrode material comprises the steps of dispersing graphene oxide in deionized water to obtain a suspension liquid A; adding analytically-pure FeCl<3>.6H<2>O and NaCl into the deionized water, adding the mixture to the suspension liquid A to obtain a suspension liquid B; pouring the suspension liquid B into a homogeneous-phase hydrothermal reaction kettle for hydrothermal reaction to obtain a product C; respectively washing the product C with water and alcohol, and dispersing the washed product in the water to obtain a product D; and freezing and drying the product D to obtain the NaCl-modified graphene net-coated Beta-FeOOH lithium ion battery negative electrode material. The performanceof Beta-FeOOH is improved by employing a composite graphene method, and the reason is that the graphene is good in conductivity and has relatively large specific area; by graphene wrapping, the problem of poor conductivity of Beta-FeOOH can be effectively solved, volume expansion also can be prevented, so that the battery structure is more stable; and by adding the NaCl, the grain size of the product can be controlled, the active sites of oxidization-reduction reaction during lithium intercalation and de-intercalation of the FeOOH are increased, so that the capacity and the cycle stability ofthe battery are improved.

The invention relates to a cobweb-like graphene coated beta-FeOOH nano-rod aggregate lithium ion battery negative electrode material preparation method, which comprises: dispersing graphene oxide in deionized water to obtain a suspension A; adding FeCl3.6H2O and NaNO3 into deionized water, and adding the obtained solution into the suspension A to obtain suspension B; pouring the suspension B intoa homogeneous phase hydrothermal reaction kettle, sealing the reaction kettle, placing the sealed reaction kettle into a homogeneous phase hydrothermal reaction instrument, and carrying out a reactionto obtain a product C; washing the product C respectively with water and alcohol, and dispersing the washed product in water to obtain a product D; and carrying out freeze drying on the product D toobtain the cobweb-like graphene coated beta-FeOOH nano-rod aggregate lithium ion battery negative electrode material. According to the present invention, the performance of beta-FeOOH is improved by compounding the graphene with the special structure, wherein graphene has advantages of good conductivity and large specific surface area, such that the poor conductivity of beta-FeOOH can be effectively solved by coating the beta-FeOOH with the special cobweb-like graphene while the volume expansion can be inhibited to achieve the stable battery structure so as to improve the cycle stability of the battery.

The invention relates to a method for growing large-domain graphene on a substrate by using hexagonal boron nitride as point-seed crystal. The method is characterized in that hexagonal boron nitride is used as point-seed crystal to grow graphene, therefore, heterojunction is easily formed with graphene; graphene continues the in-situ growth along the outer edge of boron nitride seed crystal; the concentration of a hexagonal boron nitride solution is controlled, so that the nucleation density of graphene is ensured, and the self-configuration of a non-relative nucleating point of graphene grown on the substrate in a traditional CVD technology can be avoided, and as a result, the graphene growing quality can be obviously improved.

The invention relates to the field of semiconductor materials and aims to provide a preparation method for a TiO2 / InVO4 composite porous micro-sphere. The method comprises the following steps: adding an NH4VO3 water solution into an InCl3 water solution; adjusting the pH value to 4 and agitating to obtain precipitate; adding the precipitate into a CTAB (Cetyltrimethyl Ammonium Bromide) water solution and carrying out a hydrothermal reaction; filtering, washing and drying the obtained precipitate and carrying out heat treatment to obtain an InVO4 porous micro-sphere; dispersing the InVO4 porous micro-sphere into absolute ethyl alcohol to obtain a dispersion system; gradually dripping polymer type TiO2 sol; filtering and drying the precipitate to finish a dip-coating procedure to obtain a TiO2 gel coated InVO4 porous micro-sphere; adding the TiO2 gel coated InVO4 porous micro-sphere into the water, agitating in a water bath, and filtering, washing and drying the precipitate to obtain a product. According to the preparation method for the TiO2 / InVO4 composite porous micro-sphere, the nucleation and growth problems of a TiO2 nano crystal are solved so as to accelerate the TiO2 nano crystal to grow in the InVO4 composite porous micro-sphere in an in-situ manner and prevent homogeneous separation of the nano crystal in the solution in a traditional method; the problem that the high specific surface area and the recycling of catalytic materials cannot be considered at the same time is solved and the large specific surface area and apparent size can be obtained simultaneously.

The invention discloses a preparation method of a nitrogen-doped porous carbon / carbon nanotube compound with an interpenetrating network structure. The asphalt and additives are mixed, then a solvent is added, stirred and mixed evenly, and then the solvent is distilled off, followed by drying, carbonization and other processes to prepare fluffy graphitized porous carbon. The graphitized porous carbon is added into an ethanol aqueous solution and ultrasonicated for 20 minutes, then a nitrogen source and a transition metal catalyst are added, stirred in a water bath, dried, carbonized, and finally pickled, washed with water, washed with alcohol, and dried. In the present invention, carbon nanotubes can be obtained by in-situ growth on the inner and outer surfaces of the fluffy graphitized porous carbon prepared by asphalt, the process is simplified and controllable, the production efficiency is high, the utilization rate of energy is greatly improved, and it is beneficial to reduce carbon The entanglement of the nanotubes is easy to disperse, and the preparation process is simple, the cost is low, and the industrial production is easy.