69 results about "Bismuth nanoparticles" patented technology

The claimed invention provides a wet chemical method to prepare manganese bismuth nanoparticles having a particle diameter of 5 to 200 nm. When annealed at 550 to 600K in a field of 0 to 3T the nanoparticles exhibit a coercivity of approximately 1T and are suitable for utility as a permanent magnet material. A permanent magnet containing the annealed MnBi nanoparticles is also provided.

The invention relates to a compound photocatalysis material with bismuth-sulfide nano particles / bismuth oxychloride and a preparation method thereof. The preparation method comprises the following steps of: firstly, dissolving bismuth nitrate and chlorinated 1-dodecyl-3-methyl glyoxaline into ethylene glycol monomethyl ether respectively, afterwards carrying out a thermal reaction by a solvent soas to prepare bismuth-oxychloride micron balls, then adding the bismuth-oxychloride micron balls into a water solution containing a sulfur source and exchanging parts of ions so as to prepare a compound photocatalysis material containing bismuth-sulfide nano particles and bismuth oxychloride. The method disclosed by the invention can be executed at room temperature and normal pressure, the cost is low, and equipment is simple and is easy to operate; and moreover, the compound photocatalysis material with the bismuth-sulfide nano particles / bismuth oxychloride can be produced at a large scale and has important potential application in the aspect of industrial production. The prepared compound photocatalysis material with the bismuth sulfide / bismuth oxychloride has favorable absorption of visible light, the separation of a photon-generated carrier is obviously improved, and the photocatalysis performance of the material is greatly enhanced.

The invention discloses a preparation method for bismuth / nitrogen-doped carbon-sphere composite anode material for a sodium ion battery. According to the preparation method, the bismuth / nitrogen-doped carbon-sphere composite anode material is obtained by carrying out spray pyrolysis on a mixed solution of a nitrogen-containing carbon source, a bismuth precursor, a surfactant and deionized water and then washing and drying the product. In the composite material prepared according to the method, bismuth nanoparticles are uniformly distributed in nitrogen-doped carbon spheres, and the bismuth content accounts for 50-90 percent by mass. The preparation process is simple, is low in cost, is easy to operate and is applicable for implementation in the industry and mass production, and the prepared sodium ion battery anode has the advantages of high mass specific capacity, favorable rate capability and the like.

The invention discloses a preparation method for monodisperse bismuth nano-particles with controllable particle sizes, which belongs to the technical field of nano-material synthesis. According to the preparation method disclosed by the invention, bis(trimethylsilyl) aminobismuth (Bi[N(SiMe3)2]3) is taken as a bismuth source, polyvinylpyrrolidone-hexadecane segmented copolymer (GanexV-216) is used as a protector, and diphenyl ether is taken as a solvent; the centrifuged product is dispersed in methylbenzene to keep the good dispersibility thereof. According to the preparation method disclosed by the invention, the monodisperse bismuth nano-particles with the controllable particle sizes are prepared by a simple solvent hot process. The method disclosed by the invention is simple and convenient to operate, and controllable in reaction conditions; the obtained bismuth nano-particles are good in dispersibility and uniform in particle sizes, thus providing great bismuth nano-catalyst seed crystals for the subsequent applications.

A method for synthesizing ferromagnetic manganese-bismuth (MnBi) nanoparticles, and the MnBi nanoparticles so synthesized, are provided. The method makes use of a novel reagent termed a manganese-based Anionic Element Reagent Complex (Mn-LAERC). A process for forming a bulk MnBi magnet from the synthesized MnBi nanoparticles is also provided. The process involves simultaneous application of elevated temperature and pressure to the nanoparticles.

The invention relates to the technical field of nuclear fuel post-treatment, and discloses a bismuth-based functional material capable of adsorbing gaseous iodine as well as a preparation method and application thereof. The method includes dissolving a bismuth salt and polyacrylonitrile into a solvent and mixing to form a precursor solution; carrying out electrostatic spinning to obtain a fiber membrane; and then pre-oxidizing in an air atmosphere and carbonizing in an inert gas atmosphere to obtain the bismuth-based functional material. According to the material, a carbon nanofiber membrane is used as a carrier, and metal bismuth nanoparticles are uniformly attached to fibers, so that rich active sites are provided for chemical adsorption of iodine, the adsorption capacity can reach 560 mg / g, and gaseous iodine can be effectively adsorbed and separated. Meanwhile, the material is simple in preparation method and low in raw material cost, and more importantly, compared with most of powdery adsorbents, the material has a macroscopic membrane form structure, is good in flexibility and high in thermal stability, is expected to be applied to large-scale industrial application in the spent fuel aftertreatment process and has a wide prospect.

The invention discloses a 1:1 type silicate mineral doped bismuth yellow hybridization pigment which is prepared by dissolving bismuth salt into a nitrate solution; uniformly dispersing 1:1 type silicate minerals; dissolving a vanadium source into a nitric acid water solution or an alkali water solution; putting into a bismuth solution with silicate minerals; adjusting the pH value of a reaction system to be 7-10; performing stirring reaction so as to obtain yellow precipitate; and filtering, washing, and performing calcining treatment in a muffle furnace, thereby obtaining the 1:1 type silicate mineral doped bismuth yellow hybridization pigment. Due to adoption of the 1:1 type silicate minerals, by virtue of the doping action of components Al2O3 and SiO2 of the minerals to crystal latticeof BiVO3, the color performance of the bismuth yellow pigment is improved, the particle sizes and the particle size distribution of bismuth nanoparticles are effectively controlled, and the generation of free aggregates is avoided; and meanwhile, the production cost of the bismuth yellow pigment is greatly reduced, the high value utilization of the 1:1 type silicate minerals is achieved, and theapplication range of the bismuth yellow pigment is widened.

Provided is a method of enhancing thermoelectric performance by surrounding crystalline semiconductors with nanoparticles by contacting a bismuth telluride material with a silver salt under a substantially inert atmosphere and a temperature approximately near the silver salt decomposition temperature; and recovering a metallic bismuth decorated material comprising silver telluride crystal grains.

The invention belongs to the field of preparation of electrochemical functional nano materials, and discloses a preparation method and application of a bismuth molybdate / boron nitrogen doped graphenephotoelectric functional material. Specifically, a simple and effective one-step solvothermal method is adopted to synthesize the bismuth molybdate nano particle loaded boron-nitrogen doped graphene nano sheet, and a photoelectrochemical sensor is constructed based on the photoelectric functional material. The prepared bismuth molybdate / boron nitrogen doped graphene photoelectric functional material demontrates excellent photoelectric performance, and the constructed photoelectrochemical sensor can be applied to the field of life analysis.

A preparation method of a CIST nano wire belongs to the technical field of new-generation thin-film solar cell materials. A toluene solution of Bi nanoparticles and a precursor solution of Se and Te are prepared separately. Then under the protection of nitrogen, trioctylphosphine is heated and added into the toluene solution of the Bi nanoparticles, and then the precursor solution containing indium acetate, copper acetate and Se is added into the mixture. After reactions, the precursor solution containing indium acetate, copper acetate and Se is added drop by drop. After reactions are completed, the mixture is cooled and toluene is added. Then the mixture is subjected to centrifugation. The solid phase is taken, is washed with toluene, and is subjected to centrifugation and vacuum drying. Then the CIST nano wire is obtained. The method uses the metal Bi nanoparticles as a catalyst. The toluene solution of the Bi nanoparticles is used, so that the concentration of the Bi nanoparticles can be effectively controlled, and the liquid form facilitates taking the catalyst. The method is simple in technique, can effectively control the stoichiometric ratio of multi-component materials, and obtains a large batch of high-purity CIST nano wires.

The invention relates to a method for growing bismuth nanoparticles on an oxide substrate in situ. The method comprises the following steps of: adding a bismuth-contained oxide into an aqueous solution of methanol, ethanol or glucose, wherein the bismuth-contained oxide is prepared by using a molten salt method or high-temperature solid-phase method; and then, irradiating the bismuth-contained oxide under ultraviolet light to form the bismuth nanoparticles on the surface of the bismuth-contained oxide, wherein the particle sizes of the bismuth nanoparticles are distributed uniformly. The method has the advantages of mild preparation condition, simple process, low cost and the like; the prepared bismuth nanoparticles are small in particle size and attached to the oxide substrate; the bismuth nanoparticles growing on the oxide substrate in situ by using the method can be used for the nano electron field, the catalytic field and superconducting materials and the like; and the method is simple in process and used for realizing uniform in-situ growth of the bismuth nanoparticles on the surface of the oxide at room temperature through light irradiation.

The invention discloses a dry preparation method for bismuth nanoparticles. The method comprises the steps that firstly, a good growth bismuth nanowire or a bismuth nanosheet is transferred to a micro-grid, a copper mesh or a carbon film; then the obtained micro-grid, the copper mesh or the carbon film is placed in a transmission electron microscope, an electronic gun switch is turned on to enable electron beams to illuminate the bismuth nanowire or the bismuth nanosheet, accelerating voltage is 80kV-300kV, and time is 30-180 seconds; and the bismuth nanoparticles are obtained on the bismuth nanowire or the bismuth nanosheet. The method has the advantages that cleanness and high efficiency are realized, no surface active agent is necessary, the method is simple, and the obtained bismuth nanoparticles can be used as catalysts, contrast agents and the like.

The invention belongs to the field of nanometer materials, and discloses a porous and high-specific-surface-area bismuth-nanoparticle-modified nitrogen-doped carbon nanosheet material and a preparation method and application thereof. The preparation method comprises the following steps that a polyvinylpyrrolidone solution is used as a nitrogen source and a carbon source, and is added into a beaker; bismuth salts are added into a nitrogen source solution and stirred, and the pH value is adjusted by using a weak acid solution to dissolve all the bismuth salts; the prepared solution is placed inan electrothermal blowing dry box to be dried to obtain a solid precursor; and the solid precursor is ground into fine powder and then placed into a porcelain boat, and is placed into a tube furnace to be heated and roasted under the condition of protecting the air environment to obtain the nanosheet material. According to the preparation method, synthesis and doping of carbon nanomaterials and modification of bismuth nanoparticles are combined into one, the obtained bismuth-nanoparticle-modified nitrogen-doped carbon nanosheet material is stable in structure and performance, and the good heavy metal detection performance is achieved; and the preparation method is simple and easy to operate, low in cost and suitable for large-scale production.

The invention belongs to the field of catalysis chemistry and relates to a micro-oxidized conductive carbon black supported nano metal bismuth catalyst and an application thereof. In the catalyst, firstly, micro-oxidized conductive carbon black is prepared with an improved Hammer's method and then added to ethylene glycol or glycerol and sufficiently dispersed, then, bismuth nitrate pentahydrate is added, the mixture is stirred, a mixed dispersion liquid is obtained, and finally, the catalyst is obtained after the reaction in an airtight autoclave. Through ingenious micro oxidation treatment of the conductive carbon black, rich oxygen-containing functional groups are introduced on the surface while the conductivity is guaranteed, micro-oxidized conductive carbon black supported metal bismuth nanoparticles with uniform sizes are synthesized with a one-step solvothermal method and have excellent activity of electro-catalytic synthesis ammonia.

The invention aims to provide a method for synthesizing bismuth phosphate nano particles by a room-temperature solid-phase chemical method. According to the method, cheap raw materials, namely solid bismuth salt and solid phosphate, are used as reactants, a simple operation process is adopted, and solid-phase direct chemical reaction is performed at room temperature to synthesize the bismuth phosphate nano particles. The method for preparing the bismuth phosphate nano particles, provided by the invention, has the characteristics of low cost, simplicity and good convenience in operation, short time and easiness in realization of mass production, and thus has an extremely wide application prospect.

The invention discloses a cerium oxide supported bismuth nano catalyst as well as a preparation method and application thereof and belongs to the fields of catalyst techniques and sustainable development of energy. The preparation method comprises the following steps: by using a one-step reduction method, preparing a carrier cerium oxide at the room temperature; and mixing the carrier cerium oxidewith Bi(NO3)3*5H2O, and performing steps of centrifugation, drying and calcining, so as to obtain the cerium oxide supported bismuth nano catalyst. According to the cerium oxide supported bismuth nano catalyst, massive pores inside cerium oxide are sufficiently utilized and combined with bismuth nanoparticles, so that the number of active sites can be increased, and the activity of the catalyst can be remarkably improved. Particularly, in formic acid production from CO2 through electrochemical reaction, the cerium oxide supported bismuth nano catalyst has very good catalysis activity and excellent stability.

The invention discloses a high-magnetic-energy-product sintered NdFeB permanent-magnet material made from NdFeB powder, bismuth nanoparticles, nano-strontium ferrites and nano-molybdenum disulfide by sintering. The NdFeB powder comprises, by mass, 25.6-27.1% of Nd, 0.76-0.89% of B, 0.45-0.53% of Cu, 0.25-0.32% of Co, 0.35-0.43% of Ga, 1.04-1.16% of Nb, 3.9-4.6% of Pr, 0.34-0.41% of Al and the balance Fe. The high-magnetic-energy-product sintered NdFeB permanent-magnet material has the advantages that the material is made by wrapping a main-phase grain surface layer by nano mixed powder in a homogeneous dispersion manner by means of two-time sintering and two-time tempering; the material has high residual magnetism reaching 1.46T and maximum magnetic energy product reaching 438kJ / m<3>; meanwhile, coercivity of the material is also improved.

The invention discloses a bismuth-based nano material and a preparation method and application thereof. The bismuth-based nano material comprises bismuth nanoparticles and nitrogen-doped porous carbon fibers, and the nitrogen-doped porous carbon fibers wrap the bismuth nanoparticles. The preparation method of the bismuth-based nano material comprises the steps of: dissolving a carbon source, a bismuth source and a nitrogen-containing pore forming agent in a solvent to obtain a precursor solution, and preparing a fiber material by taking the precursor solution as a raw material; and pre-oxidizing the fiber material, and calcining the fiber material in a protective atmosphere to obtain the bismuth-based nano material. The bismuth-based nano material prepared by the method has excellent electrochemical performance, especially super-long cycle stability, is superior to a bismuth-based negative electrode material reported in related technologies, and has a wide application prospect in alkaline batteries.

A preparation method of a well-dispersed bismuth sulfide nanoparticle and graphene composite material comprises the following steps: dissolving graphene oxide, bismuth ammonium citrate and thioacetamide in water to prepare a mixed solution, conducting heating in a constant-temperature oil bath in an oil bath pan, so as to combine bismuth ions, sulfur ions and graphene oxide to form a graphene oxide and bismuth sulfide intermediate product, and synthesizing the bismuth sulfide and graphene composite material under the action of a reducing agent hydrazine hydrate. The bismuth sulfide nanoparticles on the graphene are uniform in particle size, the size is about 25 nm, the growth density and the particle size of the bismuth sulfide nanoparticles can be regulated and controlled by controlling the reactant concentration and the reaction time, and the experiment process is simple and effective. The invention not only provides an experimental thought for synthesizing the semiconductor nano composite material of the base graphene, but also can be widely applied to the fields of photoelectrons, catalysis, electrode materials and the like.

The invention discloses a preparation method of enzyme-supporting bismuth selenide nanoparticles to release oxygen upon exposure to light, and relates to the field of synthesis in pharmaceutical chemistry, in particular to a method, including the steps, such as synthesizing hollow mesoporous bismuth selenide, synthesizing enzyme-supporting bismuth selenide, and loading perfluorocarbon. The preparation method of the enzyme-supporting bismuth selenide nanoparticles to release oxygen upon exposure to light comprises the specific steps of (1) synthesizing bismuth selenide through a hydrothermal process; (2) synthesizing glucose oxidase adsorbed to hollow mesoporous bismuth selenide shells by means of an ion adsorbing process; (3) filling bismuth selenide cavities with perfluorocarbon through an ultrasonic process, and filling with oxygen. A composite nano-drug delivery system acquired herein has the advantages of precision control of oxygen release, good photothermal properties, good biocompatibility and the like.

The invention discloses a treatment process for degrading printing and dyeing wastewater through photocatalysis. An adopted photocatalyst is a bismuth nanocluster-bismuth nanoparticle / TiO2 / graphene composite photocatalyst. According to the catalyst, oxidized graphene is firstly prepared, then TiO2 with photocatalytic activity is loaded on a slice layer of the oxidized graphene, a bismuth nanocluster is modified onto a graphene slice layer of TiO2, and photo-reduction is carried out. The composite photocatalyst has high catalytic degradation activity aiming at the printing and dyeing wastewater. The treatment process provided by the invention solves the problem of low degrading efficiency of the printing and dyeing wastewater in the prior art, and is applicable to degrading organic dyes inthe printing and dyeing wastewater.

The invention discloses a metal bismuth nanoparticle modified porous carbon nitride composite material and a preparation method thereof, and application of the metal bismuth nanoparticle modified porous carbon nitride composite material in removing antibiotics in water. The preparation method comprises the following steps: with bismuth salt, a low-molecular-weight saccharide compound and a borane compound as raw materials, carrying out an ultrasonic reaction to prepare metal bismuth nanoparticles; with porous carbon nitride as a raw material, conducting ultrasonic stripping to obtain dispersion liquid containing the porous carbon nitride; and carrying out ultrasonic electrostatic assembling on the metal bismuth nanoparticles and the dispersion liquid containing the porous carbon nitride so as to obtain the metal bismuth nanoparticle modified porous carbon nitride composite material. The method is simple in process, environment-friendly in raw materials, low in energy consumption and suitable for large-scale industrial production; the bismuth nanoparticles in the prepared composite material are small in particle size and narrow in distribution, no oxide layer is formed on the surface of the bismuth nanoparticles, the bismuth nanoparticles can be uniformly deposited on the surface of carbon nitride, and more catalytic active sites are provided for a photocatalytic reaction; and the composite material is used for removing antibiotics in water, and has the advantages of high degradation efficiency, thorough degradation and good environmental water matrix resistance and biological safety.

The invention discloses a rare earth up-conversion-bismuth diagnosis and treatment integrated nano hybrid system with photoresponse controllable drug release. Rare earth up-conversion nano light-emitting particles and metal bismuth nano particles are used as inner cores, and the inner cores are simultaneously coated by a silicon dioxide shell layer to form the amino rare earth up-conversion-bismuth nanoparticle nano hybrid system with a mesoporous silicon dioxide coating and a core-shell structure. Besides, a doxorubicin hydrochloride medicine is loaded in a mesoporous silicon dioxide pore channel, and meanwhile, the medicine is encapsulated by an azobenzene compound. The invention also discloses a preparation method of the system. The preparation method comprises the following steps: modifying the periphery of the up-conversion nanoparticles with a surfactant; acquiring ultra-small metal bismuth nanoparticles through an oxidation-reduction method; mixing the bismuth nanoparticles andthe up-conversion nanoparticles, and forming a mesoporous silica layer on the surface of the obtained mixture; loading doxorubicin hydrochloride into the mesoporous channel; and packaging the mesoporous channel by using azobenzene. The invention also discloses an application of the material in fluorescence imaging and electronic computed tomography imaging.

Provided are bismuth composite anodes and methods of making same. The bismuth composite anodes comprise nanomaterials comprising bismuth domains (e.g., bismuth nanoparticles) disposed in a lithium phosphate material. The bismuth domains (e.g., bismuth nanoparticles) may be formed in situ. The nanomaterials may be at least partially or completely covered in a layer of a conducting material. The bismuth composite anodes also comprise a bulk conducting material. The nanomaterials and bulk conducting materials are present as a mixture. Also, provided are batteries comprising one or more bismuth composite anodes.

The invention relates to the field of auto parts preparation, in particular to a method for preparing an automobile brake pad. According to parts by weight, the material consists of 15-20 parts of neoprene rubber, 0.5-1 part of epoxy resin, and 0.5-1 part of nano-bismuth powder. 1 part, 0.2-0.5 part of talc powder, 0.2-0.5 part of magnesium oxide powder, 0.2-0.5 part of calcium silicate powder, 0.2-0.5 part of curing agent, mix the above components and heat to 250-280 degrees Celsius and keep 1- 2h, pour into the sand mold again, form the primary product of automobile brake pad after cooling, take out the primary product of automobile brake pad and electroplate a layer of wear-resistant metal material on the surface of the primary product. The invention adopts novel materials, which contain nanometer materials, and nanometer pens are mixed into epoxy resin, together with other components and a wear-resistant metal material layer, so that the automobile brake pad has high hardness and superior wear resistance.

The invention belongs to the field of preparation of composite acoustic catalysts, and particularly relates to a cobalt tungstate / bismuth / bismuth oxybromide ternary heterojunction composite material and a preparation method and application thereof. The preparation method comprises the steps: dissolving NaPO2H2.H2O in deionized water, stirring, adding C4H6O6 and NaOH, continuously stirring, adding CoWO4, carrying out ultrasonic treatment to obtain a solution, slowly adding a Bi(NO3)3.5H2O solution dissolved in HNO3 into the solution, uniformly stirring, and carrying out hydrothermal reaction, suction filtration, washing and drying to obtain cobalt tungstate / bismuth nanoparticles; and adding the cobalt tungstate / bismuth nanoparticles into a container filled with a bismuth nitrate solution, ethylene glycol and potassium bromide, uniformly mixing, stirring, carrying out ultrasonic suction filtration, and drying to obtain cobalt tungstate / bismuth / bismuth oxybromide powder. The prepared composite material has a smaller forbidden bandwidth, and the transmission distance of electrons and holes is reduced, so that the acoustic catalytic activity of the composite material is improved. And under the ultrasonic condition, a good degradation effect on tetracycline is achieved.

The invention provides a bismuth-based nano heterojunction material as well as a preparation method and application thereof. The bismuth-based nano heterojunction material comprises bismuth oxychloride nano particles and bismuth selenide nano particles; and heterojunctions are formed between the bismuth oxychloride nano particles and the bismuth selenide nano particles. The bismuth oxychloride nano particles in the bismuth-based nano heterojunction material realize photodynamic therapy and photothermal therapy, and the bismuth selenide nano particles realize photothermal therapy, so that the material has a combined therapy mode of photothermal therapy and photodynamic therapy. The nano material is applied to tumor phototherapy, and has the advantages of good dispersibility in water, low biotoxicity and excellent crystallization performance, so that the nano material has excellent cancer treatment performance and has the capability of reducing toxic and side effects.

The invention discloses a method for preparing bismuth nanoparticles on an oxide substrate. The method comprises the following steps: uniformly mixing SrBi2Nb2O9 with NaBH4, calcining for 1-5 hours at300-800 DEG C in the presence of an inert atmosphere, washing, and drying, thereby obtaining the bismuth nanoparticles on the oxide substrate. In the presence of a reducing agent and an Ar atmosphere, non-noble metal Bi nanoparticles with high density, single dispersion and uniform and controllable particle sizes are grown in situ on the surface of SrBi2Nb2O9 with a semimetal Bi as a raw materialby using a calcining method, and in addition, the particle size of the Bi nanoparticles is 3-7 nm.