60results about How to "Composition adjustable" patented technology

The invention relates to a preparation method, a raw material, a product and an application of an optical coupling crosslinking hydrogel material. Component A-nitrobenzyl phototrigger modified high-molecular derivatives are dissolved in a medium with biological compatibility in order to obtain a solution A; component B-primary amine, diamine, hydrazide, hydroxylamine high-molecular derivatives aredissolved in a medium with biological compatibility in order to obtain a solution B; the solution A and the solution B are uniformly mixed in order to obtain a hydrogel precursor solution; the hydrogel precursor solution is under light source irradiation, aldehyde group or ketone group generated by nitrobenzyl in the component A and primary amine, diamine, hydrazide, hydroxylamine groups in the component B are crosslinked in form of Schiff base in order to form a hydrogel. The invention also provides a kit for preparation of the hydrogel, and applications of the hydrogel to tissue engineering, regenerative medicine, 3D printing, and carriers of cells, proteins or drugs. The hydrogel precursor solution is sprayed or smeared on the surface of tissue in order to realize in situ gelation under light, and the product is especially suitable for postoperative wound enclosing and tissue fluid leakage sealing.

The invention relates to a photoinduced nitroso crosslinked hydrogel material and a preparation method and application thereof. The preparation method comprises the following steps of dissolving a macromolecular derivative which is modified by an o-nitrobenzyl photo trigger in a component A into a biocompatible medium, so as to obtain a solution A; uniformly mixing the solution A, or adding a solution B containing a component B, so as to obtain a hydrogel precursor solution; under the condition of using light source to radiate the hydrogel precursor solution, enabling the o-nitrobenzyl photo trigger in the component A to produce nitroso groups through photo-inducing, and enabling the nitroso group to generate dimerization crosslinking by self to form the hydrogel, or generate addition crosslinking with nucleophile or electrophile in the component B to form the hydrogel. The invention also provides a kit for preparing the hydrogel, and application of the hydrogel in tissue engineering,regeneration medicines, 3D (three-dimensional) printing or cell, protein or drug carriers. The photoinduced nitroso crosslinked hydrogel material has the advantages that the hydrogel precursor solution can be sprayed or smeared onto the surface of the tissue, so as to realize the in-situ gelling under the condition of light radiation; the photoinduced nitroso crosslinked hydrogel material is especially suitable for the post-operation wound sealing and the tissue liquid leakage blockage.

The invention provides a preparation method, a raw material, a product and an application of a photo-coupling co-crosslinking hydrogel material. The preparation method comprises the steps of dissolving a component A, namely an o-nitrobenzyl photo-trigger modified high polymer derivative in a biocompatible medium to obtain a solution A, dissolving a component B, namely an amidogen-containing high polymer derivative or a double bond containing high polymer derivative or a sulfydryl containing high polymer derivative in the biocompatible medium to obtain a solution B, uniformly mixing the solution A (or adding the solution B) to obtain a hydrogel precursor solution, illuminating the hydrogel precursor solution under a light source, and allowing o-nitrobenzyl groups in the component A to generate aldehyde groups / ketonic groups or nitroso-groups by optical excitation for double crosslinking to exert a co-crosslinking effect. The invention further provides a reagent kit for preparing hydrogel, and the application of the hydrogel material in tissue engineering, regeneration medicine and 3D (three dimensional) printing and as a cell, protein or drug carrier.

The invention discloses a magnetic nanoparticle / macromolecular Janus microparticle and a preparation method and application thereof. The method comprises the following steps: (1) respectively charging a dispersion phase and a continuous phase into different passages in a micro-fluidic chip, finally mixing the dispersion phase with the continuous phase, and obtaining a single-emulsion-drop system on the other end of the micro-fluidic chip, wherein the dispersion phase is prepared from magnetic nanoparticles, a macromolecular polymer and an organic solvent, and the continuous phase is an aqueous solution of a surface active agent; (2) standing the single-emulsion-drop system obtained in the step (1) at room temperature, then standing in a magnetic field, after the standing is completed, heating to remove the organic solvent in the system, and washing with water. The method is novel, simple in process, common in equipment, good in operability and powerful in functions. The obtained microparticle is good in single monodispersion and has magnetism; and other functional materials can be added, so that integration of multiple functions of the material is realized.

The invention belongs to the field of materials, and in particular relates to a method for preparing phosphosilicate based glass. The method takes water, ethanol or mixture of ethanol and water as solvent, and comprises the following steps: phytic acid, ethyl orthosilicate or calcium chloride are mixed to prepare gel precursor sol solution, and gel precursor sol solution is placed until becoming sol; the sol is aged at 60 DEG C, and is baked in an oven to ensure that the solvent is completely volatilized, and is cooled to room temperature; the temperature rises from the room temperature to the temperature of between 300 and 400 DEG C; and the dry gel is sintered at constant temperature of between 300 and 400 DEG C for at least 10 minutes, and is naturally cooled so as to obtain the phosphosilicate based glass. Compared with the conventional phosphorous precursor, the phytic acid serving as the precursor of phosphorous has smaller toxicity, so the biocompatibility of the material is improved, and the phosphosilicate based glass can be prepared in the conditions of low temperature, low toxicity and low cost, and the method can successfully prepare in a larger component range the phosphosilicate based glass with biodegradation speed which can be regulated in a wider range.

The invention discloses a hedgehog SiO2 hollow microsphere and preparation method thereof. Block polymer is taken as soft template; block polymer solution is added into organic solvent / water two-phase system, so as to form stable emulsion, co-guiding agent and silicon source are dissolved in organic solvent and mixed to be uniform, and the emulsion is added; under the conditions of faintly acid and alkalescence, silicon precursor is hydrolyzed and condensed; then drying and calcination subsequent treatment are carried out; and finally the hedgedog SiO2 hollow microsphere is obtained. The invention is easy to implement and is economic and practicable, the grain diameter distribution of the prepared hedgedog SiO2 hollow microsphere is uniform, and the cavity diameter and spinous density are adjustable.

The invention discloses a method for reversely preparing a cobaltates nanowire array with a spinel structure taking mesoporous silicon oxide materials as solid templates, which is characterized in that the templates are evenly dispersed into an organic solvent which is immiscible with water at first; then, the beforehand prepared metal nitrate water solution is added into the above dispersion system drop by drop under the stirring condition; after being evenly mixed, the mixture is placed in the air to cause the solvent to be volatilized to obtain dry powder; the metal nitrate is decomposed to generate cobaltates with a spinel structure under the restricted space action of the template pores; finally, the silicon oxide templates are removed by a sodium hydroxide solution to obtain the cobaltates nanowire array with ordered mesoporous and the spinel structure. The prepared material has the advantages of high crystallinity, large specific surface area and uniform aperture, and the composition is adjustable and the structure is controllable.

The invention discloses synthesis of a CeO2-based solid solution nanometer material and an application of the nanometer material to catalytic degradation of dye, belonging to the technical field of nanocrystal preparation. A NaOH solution is used as a precipitator, octahedron CeO2 nanocrystals with different doping proportions are prepared by a high temperature hydrothermal synthesis method, and the octahedron CeO2 nanocrystals are used as catalysts for photo-catalyzing and degrading acid orange 7. The CeO2-based solid solution nanometer material prepared by using the synthesis method disclosed by the invention is an octahedron with uniform feature, the doping elements and doping proportions generate no effect on the feature of a solid solution, and the solid solution is small in crystal particle dimension, adjustable in ingredients, good in dispersibility, stable and uniform in structure, high in single synthesis yield and simple in preparation technique. The CeO2-based solid solution nanometer material is used for photo-catalyzing and degrading dye molecules, and visible light is directly utilized to obtain a high photocatalytic degradation effect, and 60-90 percent of the acid orange 7 can be catalyzed and degraded by the visual light within 2-4 hours. The CeO2-based solid solution nanometer material is a novel photocatalyst composite material with good catalytic performance, good environment-friendliness and low cost.

The invention belongs to fields of solar photothermal conversion, sea water desalinization and new materials and relates to a solar photothermal purification method of water based on corncob integralcarbon material. According to the principle, the natural structural feature of corncob is utilized, the corncob is carbonized at a certain temperature but not powdered, and the integral corncob-basedcarbon material is prepared and is utilized to perform solar photothermal evaporation of water; part of the corncob integral carbon material is vertically soaked in water to be purified, and the otherpart is vertically exposed in air; clean water is produced with water vapor under sunlight irradiation. The method herein is suitable for purifying water, including sea water, bitter salty water, high-fluorine water, industrial wastewater, domestic wastewater and the like. Agricultural product wastes and renewable clean energy, solar energy, are utilized herein to produce clean fresh water; the method herein is simple and efficient, low in carbon, green and free of pollution; the water purification method is provided herein.

The invention provides a coating type wear-resistant vanadium denitration catalyst, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) mixing a vanadium source, a tungsten source, a molybdenum source and a titanium source, and preparing a catalyst powder from the obtained mixture; (2) mixing a binder, a structure enhancer, a dispersing agent, deionized water and the catalyst powder obtained in step (1), and carrying out ball milling treatment to obtain a catalyst slurry; (3) coating pores of a honeycomb carrier with the catalyst slurry obtained in step (2) under a negative pressure condition to obtain a catalyst blank; and (4) sequentially carrying out drying and heat treatment on the catalyst blank obtained in step (3) to obtainthe coating type wear-resistant vanadium denitration catalyst. The coating type wear-resistant vanadium denitration catalyst provided by the invention has high stability, the denitration activity at 250 DEG C is as high as 100%, and the surface layer wear rate is as low as 0.1%.

The invention belongs to the technical field of material preparation and solar energy photocatalysis and especially provides a carbon nitride hollow sphere photocatalyst, a preparation method and an application thereof. In the invention, a thermal fluid is used as a reaction medium, so that by means of a solvent action of the fluid under a subcritical status, reaction activity of a precursor is increased, and growth of a product is directly controlled at a low temperature to prepare the hollow sphere granules. The method solves the dependency on a template agent in a template-calcination technology in the prior art, which has the problems that high temperature calcination and corrosive removal of the template may cause collapse of the hollow structure and the product is low in light absorption range. The method achieves self-polymerization of a triazine ring monomer into the carbon nitride hollow sphere photocatalyst under a mild condition. By regulating the reaction parameters, polymerization degree is effectively changed, thereby controlling the physical and chemical properties of the product.

The invention relates to a bimetallic cobalt-based core-shell material and a preparation method and application thereof. A core of the bimetallic cobalt-based core-shell material is a magnetic metal Co, and a shell of the bimetallic cobalt-based core-shell material is a non-magnetic metal Ag or Cu; a shape of the bimetallic cobalt-based core-shell material is fibrous or spherical, a fiber diameteris 1.3 to 36 micrometer, and a spherical diameter is 1 to 7.3 micrometer; an atomic ratio of Co to Cu is 0.25 to 21.6, and the atomic ratio of Co to Ag is 59.8 to 74.8; a saturation magnetization strength ranges from 62.2 to 159.9 emu / g<-1>. The bimetallic cobalt-based core-shell material adopts an in-situ metal replacement method and has a microwave absorption characteristic of broadband and high absorption, wherein an effective frequency band width of which the reflectivity is less than or equal to -10dB is 5.1-7.76GHz; a bandwidth less than or equal to -20dB is 2.32-16.0GHz; a maximum reflection loss ranges from -52.5 dB to -19.7 dB. The bimetallic cobalt-based core-shell material has the advantages of simple process, easy industrial popularization, excellent material performance and good application prospect in the fields of catalysis, electrode materials, microwave absorption, high-density magnetic recording materials, sensors and the like.

The invention discloses preparation and an application of a magnetic nanoring microwave absorbing agent, and particularly relates to a magnetic nanoring microwave absorbing agent with characteristics of good monodispersity and homogeneity, high magnetic responsiveness, excellent microwave absorbing performance, adjustable size and composition and the like as well as a preparation method and an application of the magnetic nanoring microwave absorbing agent. A magnetic nanoring adopts a polycrystalline structure formed by agglomeration of nanocrystallines and is oval, the length of a long axis is 28-175 nm, the length of a short axis is 18-130 nm, and the ring wall thickness is 7-35 nm; the magnetic nanoring comprises the component of Fe3O4, Fe3O4 / C or Fe / C with a spinel structure; ferric glycolate is taken as a precursor, and the magnetic nanoring is prepared by adopting an inert gas protective carbothermic reduction method-carbonization-solid-phase diffusion growth cooperation mechanism. The preparation and the application of the magnetic nanoring microwave absorbing agent are simple in process, low in cost and high in efficiency and facilitate industrial application and popularization, and the Fe3O4 and the carbon-magnetic nanoring have broad application prospects in the aspects of microwave absorption, a catalyst, an electrode material, a magnetic recording material, a biological sensor, separation or medical imaging.

The invention discloses a preparation method of phosphorus and nitrogen contained acrylate and copolymer core-shell particles of the phosphorus and nitrogen contained acrylate. Phenylphosphonic dichloride, hydroxyethyl acrylate and diethylamine which are taken as raw materials react with trimethylamine as an acid binding agent in tetrahydrofuran at 0-5 DEG C, and phosphorus and nitrogen contained acrylate is prepared. The synthesis method is simple, and the cost is low. The phosphorus and nitrogen contained acrylate can be subjected to free-radical copolymerization with other acrylate monomers. The core-shell particles of the phosphorus and nitrogen contained acrylate are prepared with a core-shell emulsion polymerization method, the core-shell particles have the advantages of adjustable structure and composition, have certain flame retardancy on the premise that the structure of a core-shell impact modifier is not changed and are expected to be used for toughening flame retardant materials.

The invention provides preparation, raw materials, a product and application of an optical coupling synergistic cross-linked hydrogel material. The preparation method comprises the following steps: dissolving a component A o-nitrobenzyl photo-trigger modified polymer derivative into a biocompatible medium to obtain a solution A, and dissolving a component B amino-containing polymer derivative or double bond-containing polymer derivative or sulfydryl-containing polymer derivative into a biocompatible medium to obtain a solution B; uniformly mixing the solution A or the solution B to obtain a hydrogel precursor solution; and under the irradiation of a light source, making the o-nitrobenzyl in the component A generate aldehyde groups / keto groups or nitroso groups at the same time under the optical excitation to perform double cross-linking, so that a synergistic cross-linking effect can be achieved. The invention also provides a kit for preparing a hydrogel, and application of the hydrogel material in tissue engineering and regenerative medicine, 3D printing and as a cell, protein or drug carrier.

The invention discloses an Hf-Al-Si multiphase oxide ceramic fiber and a preparing method thereof. The weight ratio of HfO2 to Al2O3 to SiO2 in the ceramic fiber is (1-50):(20-94):(5-40), the averagediameter of the fiber is 5-15 micrometers, and the tensile strength is not smaller than 1.5 GPa. The preparing method comprises the steps of preparing an Hf-Al-Si multiphase oxide ceramic precursor, conducting melt spinning on the precursor, and afterwards, conducting non-melting treatment, inorganic treatment and high-temperature sintering treatment in sequence to obtain the Hf-Al-Si multiphase oxide ceramic fiber, wherein the softening point of the Hf-Al-Si multiphase oxide ceramic precursor is 85-135 DEG C. The Hf-Al-Si multiphase oxide ceramic fiber has a high temperature-resistance grade,and the reduction degree of mechanical performance after high-temperature treatment is small; moreover, the Hf-Al-Si multiphase oxide ceramic precursor can exist in the form of solids, can be dissolved with a specific solvent, and can also be molten, the applicability is improved, and the Hf-Al-Si multiphase oxide ceramic fiber is suitable for application and popularization.

The invention relates to a carbon nanotube composite material, in particular to a ZnAl, namely layered double hydroxides / carbon nanotube composite material ZnAl-LDHs / CNTs with [Zn<2+>1-xAl<3+>x(OH)2](CO3<2->)x / 2.nH2O / CNTs as a structural general formula. In the composite material, the layered double hydroxides are sheet shaped and evenly distributed on the surface of a carbon nanotube, and the grain size of the layered double hydroxides is between 10 and 40nm. The composite material is a good photocatalyst and can be used for photocatalytic degradation of dye molecules; and the catalytic efficiency for the photocatalytic degradation of methyl orange can reach between 60 and 90 percent.

The invention discloses a preparation method of a composite particle with a hairy structure on the surface. The preparation method comprises the following steps: 1) dispersing inorganic nanoparticlesin an organic solvent; and 2) adding an initiator and a monomer into the system in the step 1), and carrying out cationic polymerization on the monomer to generate polymer nanofibers on the surfaces of the inorganic nanoparticles, thereby obtaining the composite particles. According to the preparation method of the composite particle with the hairy structure on the surface, polymer nanofibers growon the surface of the particle in situ through a cation precipitation polymerization method by utilizing the quenching effect of functional groups on the surface of inorganic nanoparticles on cations. According to the method, the application range of the inorganic nanoparticles is wide, and the composition and the morphology of the polymer fibers can be controlled through reaction conditions.

The invention belongs to the technical field of removal of inorganic advanced materials and pollutants in water, and particularly relates to a three-dimensional pore intercommunicated nano crystal mesoporous photocatalyst and a preparation method thereof. The mesoporous photocatalyst is prepared from a straight-pore and large-aperture nano composite mesoporous oxide material of a two-dimensional hexagonal structure by etching amorphous SiO2 nanoparticles in a pore wall in NaOH solution, washing, drying and activating, wherein the aperture range of the new catalyst is 1-20 nm, the BET specific surface area is 80-900 m<2> / g, and the thermal stability is higher than 400 DEG C. At room temperature and under ultraviolet illumination, the performance for the mesoporous photocatalyst to degrade cationic dyes and anionic dyes in a liquid phase is 2-10 times the performance of the original corresponding straight-pore nano composite mesoporous material of the two-dimensional hexagonal structure; and the performance for degrading algal toxin is 1.3-6 times that of the straight-pore nano composite mesoporous material of the two-dimensional hexagonal structure.

The invention discloses a low-temperature carbon dioxide methanation catalyst and a preparation method thereof. The catalyst comprises an active component and a carrier, wherein the active component is Ni, and the carrier is alumina, zirconia or a composite carrier of alumina and zirconia, wherein the mass percentage of the active component Ni is 5-25wt%, and the balance is the carrier. The methodcomprises: dissolving aluminum nitrate, zirconium nitrate or a compound of the aluminum nitrate and the zirconium nitrate and nickel nitrate in deionized water to obtain a mixed solution, dropwise adding a precipitant into the obtained mixed solution, stirring to obtain a solid-liquid mixture,aging the obtained solid-liquid mixture, washing the aged solid-liquid mixture with distilled water untilthe aged solid-liquid mixture is neutral to obtain a solid sample, and finally, sequentially drying, roasting and treating the solid sample to obtain the Ni-based catalyst, namely the low-temperaturecarbon dioxide methanation catalyst. The methanation catalyst prepared by the invention has an effect obviously superior to that of the traditional Ni / Al2O3 catalyst, and is simple in preparation method, stable in performance and long in service life, excellent development prospect.

The invention aims at solving the problems that existing brake pad materials are unstable in frication performance, high in hardness, high in oscillation frequency, poor in automatic performance, uneven in frication and the like, and provides a novel modified prefabricated body carbon ceramic brake pad material and a manufacturingmethod thereof. The manufacturingmethod of the novel modified prefabricated body carbon ceramic brake pad material includes the steps ofusing a novel carbon fiber prefabricated body of a sandwich structure, preparing and processing fibers of a needled structure, manufacturing C / C porous bodies by adopting a slurry infiltration process, and introducing SiC-based, Si-based and B-based compounds into the carbon / ceramic porous prefabricated bodies;the puzzle that theresidual amount of Si is uncontrollable is effectively solved. According to the sandwich-shaped C / SiC brake material, stability of dry state frication performance is improved, the static friction coefficient is improved, and friction performance under a wet state condition does not attenuate.

The invention discloses a magnetic heterostructure fiber, and a preparation method and application thereof. The fiber has a porous heterostructure, and the core of the fiber is ferroferric oxide assembled by nanocrystals and the surface of the fiber is coated by nickel nanocrystal; and the fiber length is 0.57-2.18 [mu]m, the diameter is 0.07-0.73 [mu]m, the nickel / iron atom ratio is 0:100-28.88:71.12, and the saturation magnetization is high (75.243-86.442emu / g). The fiber is prepared by using precipitation-precipitation transfer method-carbothermic reduction technology. The inventive method is simple in operation, good in controllability and repeatability, novel in formation mechanism, low in equipment requirements, low in cost and high in efficiency, and easy to promote industrial applications. The magnetic heterostructure fiber has the characteristics of porous structure, adjustable size and composition and strong magnetic responsiveness, and important application prospects in the fields of catalysts, electrode materials, magnetic recording materials, magnetic sensors, detection, microwave absorption, etc.

The invention discloses a methane cracking catalyst and a preparation method thereof, and belongs to the technical field of methane cracking catalyst preparation. According to the catalyst, nickel-copper alloy nanoparticles are used as an active phase, and aluminum oxide is used as a structural aid; the preparation method comprises the following steps: firstly, synthesizing nickel-copper-aluminumlayered composite hydroxide as a catalyst precursor by adopting a coprecipitation method, roasting and decomposing at 500 DEG C to form a rock salt type nickel oxide-copper oxide-aluminum oxide solidsolution, and then carrying out hydrogen reduction treatment at 800 DEG C to generate the highly-dispersed nickel-copper alloy nanoparticles in situ. The average grain size of the nickel-copper alloyof the catalyst is 9-10 nm, the nickel-copper alloy has the characteristics of uniform composition and adjustable composition, the catalyst shows good catalytic performance on high-temperature methanecracking reaction, the carbon yield at the reaction temperature of 650 DEG C can reach 70 g carbon per gram of the catalyst, and carbon nanotubes of a bamboo joint type structure can be obtained.

The invention discloses a nano boron phosphate catalytic carbonization flame-retardant epoxy resin and a preparation method thereof, belonging to the technical field of flame-retardant materials. The epoxy resin is mainly composed of an epoxy resin monomer, a curing agent and a catalytic carbonization flame retardant. The preparation method comprises the following steps: adding boric acid and phosphoric acid into a reactor, stirring at 110-120 DEG C for 25-35 minutes, and keeping the temperature for 4-5 hours to obtain a white solid 1; calcining the white solid 1 at 500-700 DEG C for 8-12 hours, washing for 3-5 times, and carrying out vacuum drying to obtain the solid acid nano boron phosphate; adding an ethanol dispersion solution of the solid acid nano boron phosphate into the epoxy resin monomer, uniformly dispersing by stirring, removing the ethanol in a vacuum, adding a curing agent, removing air, and curing to obtain the nano boron phosphate catalytic carbonization flame-retardant epoxy resin. The epoxy resin has the advantages of low flame retardant addition amount, high flame-retardant efficiency, low smoke generation amount and environment friendliness. The method has the advantages of simple preparation technique and low cost.

The invention provides a preparation method of a high-performance sulfur-carbon composite powder material. The method concretely comprises the following steps: 1, placing a carbon powder material in a fluidized bed, continuously introducing a gas from the bottom of the fluidized bed, and adjusting the flow velocity of the gas to make the carbon powder be in a fluidized state; and 2, processing elemental sulfur to prepare liquid sulfur, keeping the temperature of the liquid sulfur in a range of 113-440DEG C, atomizing the liquid sulfur, spraying the atomized liquid sulfur into the fluidized bed to make the atomized liquid sulfur be in contact with the fluidized carbon powder material, and cooling the contact mixture to prepare the sulfur-carbon composite powder material. The sulfur-carbon composite powder material prepared in the invention has the following advantages: the sulfur / carbon ratio and the particle size are adjustable and controllable, carbon and sulfur are uniformly distributed in the composite material, and the particle size of the material is uniform; sulfur and carbon are compactly combined in the composite material, and the electricity conductivity is high; carbon coated outside sulfur can effectively inhibit dissolving loss and shuttle effect of polysulfide; and the composite powder material has a spherical or spheroidic morphology and high tap density, and the processing performance of the material is improved.

The invention discloses a preparation method of liquid polyborosilazane, which comprises the following steps: heating a reaction kettle, replacing gas in the reaction kettle with nitrogen, and keeping the reaction kettle in a micro-positive pressure state; under the condition, sequentially adding a solvent, boron chloride gas, chlorosilane and unsaturated chlorosilane, and stirring to react; the invention discloses a preparation method of liquid polyborosilazane, which comprises the following steps of: adding a solvent into a mixed solution, dropwise adding hexamethyldisilazane into the mixed solution for reaction, distilling to remove the solvent, heating and distilling until no liquid flows out, and cooling a final product to obtain the liquid polyborosilazane, and adopts a one-step co-condensation method, so that the synthesis process of a precursor is greatly simplified, the synthesis process is simple, the synthesis yield is high, byproducts are easy to remove, and the preparation method is suitable for industrial production. The liquid polyborosilazane prepared by the method is adjustable in viscosity, and has the advantages of good wettability to fibers, high ceramic yield and the like.

The invention belongs to the technical field of inorganic advanced materials, and specifically relates to a nanocrystalline large-aperture mesoporous oxide material and a preparation method thereof. The mesoporous oxide material is synthesized from inorganic precursors and organic template molecules through the self-assembly process induced by organic solvent evaporation in an acidic environment, and its space group structure is a two-dimensional hexagonal structure, a three-dimensional hexagonal structure, and a three-dimensional cubic structure; the pore size The range is 1-18nm, the BET specific surface area is 50-800m2 / g, and its thermal stability is higher than 400°C, and the highest can reach above 850°C.

The invention provides surface-alloyed metal lithium foil and a preparation method thereof, a metal lithium negative electrode and a lithium battery. The surface-alloyed metal lithium foil comprises: a metal lithium foil bulk phase; and an alloying layer which is positioned on at least one surface of the metal lithium foil bulk phase, wherein the alloying layer is formed in situ through alloying reaction of metal lithium on the surface. The alloying layer and the metal lithium are integrated and can change along with the volume change of the metal lithium negative electrode, and the alloy layer and the metal lithium bulk phase cannot be separated, so that the lithium battery has better cycle performance.