24 results about "Bimetallic nanoparticle" patented technology

The invention discloses a preparation method and application of a zinc-bromine flow battery positive electrode material, and belongs to the field of zinc-bromine flow batteries. The preparation method comprises the following steps: firstly, cleaning and activating a carbon-based three-dimensional conductive network substrate by adopting plasmas, performing oxygen / argon plasma etching, and performing chemical vapor deposition on carbon to prepare three-dimensional porous carbon; then growing a metal oxide nanocrystalline array on the three-dimensional porous carbon by a hydrothermal method, and carrying out ammonia gas calcination to convert the metal oxide nanocrystalline array into a metal nitride nanocrystalline array; then preparing an electro-deposition solution containing tin bismuth salt and an aniline-bromine source polymerization solution, and constructing Sn-Bi bimetallic nanoparticles and a polyaniline-bromine complex layer on the metal nitride nanocrystalline array / three-dimensional porous carbon precursor through electro-deposition and electro-polymerization in sequence to finally prepare the high-performance zinc-bromine battery positive electrode material. The positive electrode material has high conductivity, excellent Br2 / Br <-> catalytic activity and structural stability, and the coulombic efficiency, the voltage efficiency and the energy efficiency of the battery are remarkably improved.

The invention discloses a zeolite / silver / copper ternary inorganic nano antibacterial and antiviral material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a mixed solution of a template agent and an anchoring agent, loading a metal precursor, adding a silicon source, performing hydrothermal crystallization and performing post-treatment. According to the zeolite / silver / copper ternary inorganic nano antibacterial and antiviral material disclosed by the invention, Ag-Cu bimetallic nanoparticles are formed by introducing copper nitrate and silver together, so that the catalytic activity, selectivity and stability of the zeolite / silver / copper ternary inorganic nano antibacterial and antiviral material are remarkably enhanced, and the dosage of noble metal silver can be reduced.

The invention belongs to the technical field of catalysts, and particularly discloses a bimetallic catalyst of a core-shell structure and a preparation method and application thereof.The bimetallic catalyst of the core-shell structure comprises an inner core and an outer shell, the inner core comprises a molecular sieve serving as a carrier and bimetallic nano-particles loaded on the molecular sieve, and the outer shell comprises the molecular sieve and bimetallic nano-particles loaded on the molecular sieve; the shell is a biochar shell coating the inner core, the bimetallic nanoparticles are composed of nano-sized Ni and a second metal M, and the second metal M is one of Mo, W, Co or Ti. The bimetallic catalyst with the core-shell structure provided by the invention has the advantages of stable structure, low cost, high activity and high selectivity, and the preparation method is simple.

This invention belongs to the field of biosensing technology, specifically relating to a modified carbon fiber electrode for detecting dopamine, its preparation method, and its application. The modified carbon fiber electrode comprises a carbon fiber electrode onto which gold-platinum bimetallic nanoparticles and polydopamine are sequentially modified. The preparation method specifically includes: firstly, modifying the surface of activated carbon fiber filaments with chloroauric acid and sodium citrate to obtain Au@CF; then, modifying the Au@CF surface with ascorbic acid and chloroplatinic acid to obtain platinum nanoparticles, obtaining Au / Pt@CF; finally, immersing the Au / Pt@CF in a dopamine solution to coat the Au / Pt@CF surface with polydopamine, obtaining PDA@Au / Pt@CF. This electrode has advantages such as high sensitivity, low detection limit, strong anti-interference ability, good biocompatibility, and high mechanical stability, making it suitable for dynamic monitoring of dopamine in the living brain.

This invention discloses a bimetallic nanoparticle photocatalytic hydrogen evolution catalyst and its preparation method, relating to the field of photocatalytic materials technology. The bimetallic nanoparticle photocatalytic hydrogen evolution catalyst is composed of a potassium-modified heterojunction composite support, iron nitrate nonahydrate, nickel nitrate hexahydrate, and citric acid monohydrate. The iron-nickel bimetallic nanoparticles are highly dispersed and tightly loaded on the potassium-modified heterojunction composite support, providing abundant catalytic active sites. The tight combination between the two ensures that photogenerated electrons can rapidly flow from the support to the metal, improving catalytic efficiency. Furthermore, through physical confinement effects and strong interactions between the metal and the support, the migration and aggregation of nanoparticles are effectively suppressed. In addition, the zero-valence or low-valence state of the metal active centers is maintained, inhibiting their oxidative deactivation, thereby significantly improving the stability of the catalyst.

The invention relates to a catalyst for one-step production of tetrahydrofuran from furfural, which takes a zeolite molecular sieve as a carrier, and platinum-palladium bimetallic nanoparticles or atomic clusters are confined in internal ducts or cavities of the zeolite molecular sieve; the total loading amount of platinum and palladium metal in the catalyst accounts for 0.01-2.0 wt.% of the total mass of the catalyst. Platinum accounts for 0.1-50% of the total atomic mass of platinum and palladium. The catalyst is a zeolite-encapsulated platinum-palladium catalyst which is stable in structure and high in metal dispersity, has monatomic alloy characteristics, is used in a catalytic reaction for one-step production of tetrahydrofuran from furfural, and is good in catalytic performance.

The invention relates to the technical field of catalytic oxidation carbonylation, in particular to a catalyst and a preparation method and application thereof. The invention provides a catalyst. The catalyst comprises nitrogen doped carbon and CoCu bimetallic nanoparticles dispersed in the nitrogen doped carbon. The catalyst has high activity, high selectivity and long service life.

The application belongs to the technical field of drug delivery carrier, and particularly relates to a dual-metal nanodot-oncolytic virus intravenous delivery system and a preparation method and application thereof in tumor immunotherapy. The oncolytic adenovirus is used as raw material, and the dual-metal nanodot-adenovirus chimera is constructed by using the covalent force of 4-maleimide butyric acid-N-succinimidyl ester. The preparation performance, cytotoxicity, action mechanism, in-vivo anti-tumor effect, anti-tumor immunity, anti-tumor recurrence and anti-tumor metastasis effect of the chimera are evaluated. The preparation process is simple, the prepared dual-metal nanodot-adenovirus chimera has small and uniform particle size, is conducive to enrichment in tumor tissues through the enhanced permeability and retention (EPR) effect, has high drug loading capacity, good safety and can generate high-intensity MRI signals at the tumor site. The designed dual-metal nanodot-adenovirus chimera realizes the integration of tumor diagnosis and treatment.

A hybrid catalytic nanoreactor having selectivity and stability in presence of air is provided for reduction reactions including semi-hydrogenations comprising of light harvesting dendritic plasmonic colloidosomes (DPC) of gold preferably as black gold and co-acting synergistically active catalytic sites of Pt-doped Ru bimetallic nanoparticles for desired significantly special selectivity and air-stability as a plasmonic reduction catalyst favoring plasmon-mediated simultaneous reduction and oxidation of metal active sites for facilitating reduction reactions including semi-hydrogenation activity. Said black gold / RuPt catalyst showcases good efficiency in acetylene semi-hydrogenation, attaining over 90% selectivity with ethene production rate of 320 mmol g−1 h−1 with its stability evident from 100 h of operation with continuous air flow, attributed to the synergy of co-existing metal oxide and metal phases. The catalyst's stability is further enhanced by plasmon-mediated concurrent reduction and oxidation of the active sites, facilitating its end use and applications in chemical industries, petrochemical industries, and applications catalysis.

The present application relates to the technical field of biological detection, and particularly relates to a system and a method for detecting oxidized low density lipoprotein. The PLA-HCR metallization system provided by the present application constructs an "AND" logic gate based on a proximity effect, realizes direct recognition and signal amplification of oxLDL complete particles in combination with a hybridization chain reaction, and overcomes the limitation in traditional methods that only rely on indirect reflection of lipoprotein particle concentration between single components; the system uses gold-platinum bimetallic nanoparticles to endow oxLDL particles with high-efficiency exogenous peroxidase catalytic activity, and compared with traditional peroxidase, the enzyme catalytic efficiency is significantly improved, and the system has the ability to directly detect undiluted serum samples, avoiding the cumbersome pretreatment process of traditional ELISA methods. The present application has the characteristics of high specificity, wide detection range and simple operation, and has a wide application prospect in early diagnosis, curative effect monitoring and prognosis evaluation of patients with atherosclerotic cardiovascular disease.

The invention provides a graphene-based polyaniline supported AgAu bimetallic composite catalyst as well as preparation and application thereof, and belongs to the technical field of testing or analyzing materials by means of measuring chemical or physical properties of the materials. The catalyst comprises a polyaniline-reduced graphene oxide composite sphere carrier with open pore channels, and AgAu bimetallic nanoparticles loaded on the surface and inside of the composite sphere carrier, the composite sphere carrier takes reduced graphene oxide which is spatially folded and curled under the coordination action of Fe < 3 + > as a framework, and polyaniline adheres to and grows on the surface of the framework; the AgAu bimetallic nanoparticles are formed through a replacement reaction, wherein the center of the AgAu bimetallic nanoparticles takes Ag as a main element, and the outer layer of the AgAu bimetallic nanoparticles is enriched with Au. The catalyst shows extremely low detection limit, wide linear range and high sensitivity to DA, inhibits non-specific response of AA and UA at the same time, and realizes excellent anti-interference performance.

The invention belongs to the technical field of high polymer material synthesis and catalysis, and relates to preparation of bio-based polycarbonate polyol and a bimetallic catalyst used in the bio-based polycarbonate polyol, the bimetallic catalyst is composed of a porous carrier and an active component loaded on the porous carrier, the active component is zinc-lithium bimetallic nanoparticles, and the molar ratio of zinc to lithium is (3-5): 1; the bio-based polycarbonate polyol is prepared by adopting the bimetallic catalyst, taking polyol A, carbonate B and polyol C as raw materials, and sequentially carrying out melt ester exchange and polycondensation. Wherein the polyol A is isosorbide, isohexitol or isomannitol, and the carbonate B is diphenyl carbonate or dimethyl carbonate; the temperature of melt ester exchange is 120-160 DEG C, and the temperature of polycondensation is 170-200 DEG C. The catalyst provided by the invention solves the technical problems of low molecular weight, wide distribution, dark color and poor performance of a product caused by high-temperature degradation of bio-based rigid cyclic diol in traditional ester exchange polymerization; the preparation method of the bio-based polycarbonate polyol is simple.

The application discloses a lithium-sulfur battery diaphragm decorated by a bimetallic nanoparticle catalytic material and a preparation method and application thereof, and belongs to the technical field of lithium-sulfur battery materials. The application constructs a RuNi bimetallic nano-catalytic layer on the surface of a Celgard 2500 diaphragm, so that the diaphragm has the dual functions of high-efficiency adsorption and catalytic conversion of polysulfides, thereby reducing the diffusion and migration of polysulfides in electrolyte, reducing the occurrence of side reactions, accelerating the redox reaction process of sulfur species, and significantly improving the coulombic efficiency, rate performance and cycle stability of the lithium-sulfur battery, thereby providing technical support for industrial application of the lithium-sulfur battery.

The invention discloses a Cu-Ag / SiO2-coated PDMS composite antibacterial osseointegration promoting coating and a preparation method and application thereof, and belongs to the technical field of biomedical materials and surface engineering.The preparation method comprises the steps that S1, copper salt and silver salt are dissolved in a solvent to prepare a mixed metal precursor solution; s2, mixing the mixed metal precursor solution with PDMS (Polydimethylsiloxane) organic silicon resin containing SiO2 nanoparticles to form a precursor composite system; s3, a reducing agent is added into the precursor composite system, metal ions are subjected to in-situ reduction in the PDMS-SiO2 hybrid network and are subjected to domain limitation, and Cu-Ag bimetallic nanoparticles are formed; and S4, applying the system to the surface of a pretreated matrix, and curing to form the composite antibacterial osseointegration promoting coating. The method is mild in process condition, simple in step, easy to regulate and control, suitable for spraying, spin coating, dip coating and other coating modes, and capable of being applied to surface functional modification of orthopedic and oral titanium-based implants.

The present invention relates to a catalytic system in the form of a colloidal suspension comprising a plurality of bimetallic nanoparticles based on at least one metal from group VIII and / or a metal from group IB, characterized in that said nanoparticles have a number average diameter of less than 10 nm, and in that the standard deviation relative to the size of said nanoparticles is less than or equal to 50% of said average diameter.

The invention provides a polymer-loaded ruthenium-iridium bimetallic nanoparticle electro-catalytic material and a preparation method thereof. The preparation method comprises the following steps: preparing phytic acid doped polyaniline as a carrier on a foamed nickel electrode through an electrochemical polymerization deposition method, then soaking the carrier in a solution containing metal ruthenium salt and metal iridium salt, and heating to form ruthenium-iridium bimetal nanoparticles loaded on the polyaniline carrier. The polymer-loaded bimetallic nano-material prepared by the method has a porous structure, good conductivity and ruthenium-iridium bimetallic active sites, and has high activity and stability on catalytic electrolysis water hydrogen evolution reaction under acidic and alkaline conditions.

The application discloses a preparation method of bimetallic nanoparticles and application of the bimetallic nanoparticles in lithium-sulfur batteries. The preparation method of the bimetallic nanoparticles comprises the following steps: configuring ZIF-8 seeds, configuring ZIF-8@ZIF-67 powder, and obtaining Co3ZnC nanoparticle carbon derivatives by using a joule heat rapid sintering technology. The Co3ZnC nanoparticle carbon derivatives prepared by the application have a stable framework provided by ZIF-8@ZIF-67 precursors, and can inhibit the diffusion of polysulfides; the Co3ZnC nanoparticle carbon derivatives have active sites of Co ZnC, and can accelerate the catalytic conversion of polysulfides; and therefore, the Co3ZnC nanoparticle carbon derivatives have high conductivity, excellent catalytic performance and strong chemical adsorption capacity for polysulfides. The Co3ZnC nanoparticle carbon derivatives have good prospects when applied in lithium-sulfur batteries.

The invention relates to a manufacturing method of a microneedle sensor and application of the microneedle sensor in carbendazim in-situ detection, and belongs to the technical field of microneedle sensors. According to the scheme of integrating bimetal nanoparticle modification, hydrophilic modification microneedle and filter paper, the three technical problems of in-situ detection are solved: the anti-interference capability of a single metal electrode is insufficient, the liquid extraction efficiency is low due to insufficient hydrophilicity of a traditional microneedle, and electrochemical signals are unstable under the condition of trace liquid.

The invention relates to a preparation method and application of a lignin-based RuZn aerogel composite material. According to the preparation method, sodium lignin sulfonate is taken as a carbon source, and a composite structure with high-dispersity Ru-Zn bimetallic nanoparticles loaded in a carbon aerogel network is constructed in situ through the steps of initiated polymerization, sol-gel forming, calcination in a nitrogen atmosphere and the like. The material has an aerogel porous structure, a high specific surface area and metal synergistic activity, and can efficiently catalyze oriented depolymerization of lignin in a self-hydrogen-supply system without additional hydrogen. The lignin-based RuZn aerogel composite material provided by the invention has the advantages of simple and convenient preparation process, green and low-price raw materials and highly controllable structure, is suitable for efficient conversion of biomass such as lignin, provides a new material selection and research direction for a biomass catalytic conversion technology, and has a wide industrial application prospect.

The invention provides a nanoparticle dynamic antibacterial absorbable suture line and a preparation method thereof, and belongs to the technical field of biomedical materials. According to the suture line, the problems that a traditional suture line is insufficient in antibacterial performance, low in mechanical strength and uncontrollable in drug sustained release are solved by constructing a three-level heterostructure; polyvinyl alcohol, polycaprolactone, mesoporous silica and Ag-Cu bimetallic nanoparticles are adopted as raw materials; the dynamic antibacterial suture line with the three-level heterostructure is successfully prepared through the steps of spinning solution preparation, fiber forming and drafting, composite coating colloid preparation, a dipping-spin coating combined process, irradiation crosslinking and the like. According to the method, by constructing a pH / lysozyme double-trigger intelligent drug release system, accurate antibacterial performance related to the infection degree is achieved, and antibiotic dependence is avoided. The tensile strength of the product reaches 120-180 MPa, the antibacterial rate of the product to escherichia coli and staphylococcus aureus reaches 99.99%, and the product is widely applicable to various clinical scenes such as clean surgical incision closure, polluted wound repair, chronic wound management and high-risk infection operations.

The invention discloses a small-size monodisperse copper-silver bimetallic nanoparticle sterilization corrosion inhibitor and a preparation method and application thereof, and belongs to the technical field of microbial corrosion protection.The preparation method comprises the steps that 1, a copper source compound, polyvinylpyrrolidone and sodium citrate are added into deionized water, a reducing agent is dropwise added for reduction, and a Cu nanometer core is generated; 2) cooling the system to room temperature, adding a silver source compound solution, and adjusting the pH value of the system to 6-8; and (3) the solution is heated and continuously stirred, a reducing agent is dropwise added, Ag is promoted to evenly grow on the surface of the Cu core, a shell layer is formed, and the copper-silver bimetallic nanoparticle hydrosol is obtained. The copper-silver bimetallic nanoparticle hydrosol has good dispersity, water solubility and stability, can effectively kill bacteria causing microbial corrosion, and has a killing effect on fixed cells under a biological membrane, so that microbial corrosion is prevented.

The invention relates to the technical field of functional fillers, and discloses functional filler-based heat-conducting flame-retardant rubber and a preparation method thereof. The preparation method of the heat-conducting flame-retardant rubber based on the functional filler comprises the following steps: modifying helical carbon nanofibers through polydopamine to obtain surface modified helical carbon nanofibers; the preparation method comprises the following steps: firstly, growing silver-copper bimetallic nanoparticles on surface modified spiral carbon nanofibers in situ, and then modifying by gamma-aminopropyltriethoxysilane to obtain a surface modified composite nanomaterial; reacting the flame retardant modifier, 5-hexene-1-amine and the surface modified composite nano material to obtain a functional filler; natural rubber, functional modified natural rubber and butadiene rubber are mixed, the functional filler, auxiliaries and sulfur are added for mixing, open milling and sheet discharging are conducted, vulcanization forming is conducted, and the heat-conducting flame-retardant rubber based on the functional filler is obtained. The heat-conducting flame-retardant rubber based on the functional filler has good mechanical properties, flame retardance and heat-conducting property.

The application discloses carbon fiber anchoring bimetallic nanoparticles electrocatalytic material and a preparation method and application thereof. The bimetallic nanoparticles are uniformly dispersed in a fiber base, and the preparation steps comprise the following steps: dissolving an iron source and a manganese source in an organic solvent, adding an organic polymer, stirring uniformly to obtain a precursor solution; performing electrostatic spinning by using the precursor solution, the organic polymer is dragged by an electric field in a jet flow state and solidified, and the metal is anchored in the fiber original wire in situ; and performing pre-oxidation and carbonization treatment on the fiber original wire in sequence to obtain the carbon fiber anchoring bimetallic nanoparticles electrocatalytic material. The electrocatalytic material has the advantages of multiple active sites, good cycle stability and low metal leaching amount. The electrocatalytic material can realize efficient electrocatalytic degradation of organic pollutants in water, and has the advantages of strong anti-interference ability and wide application range.

The invention belongs to the field of functional materials, and particularly relates to a preparation method of copper / calcium bimetallic MOF nanoparticles, an obtained product and application. The copper / calcium bimetallic MOF nanoparticles prepared by the method enter a tumor microenvironment, calcium phosphate is degraded to release calcium ions and phosphate radicals under an acidic condition, and excessive exogenous calcium ions induce disorder of an ion pathway to cause mitochondrial function disorder. Meanwhile, copper ions and Ce6 are released under the condition of high glutathione content, the copper ions react with glutathione (GSH) to generate cuprous ions, and the cuprous ions are subjected to a Fenton-like reaction to catalyze H2O2 to be converted into OH; the chlorin e6 can generate singlet oxygen (1O2) under irradiation of 660 nm laser, mitochondrial function damage is enhanced, and cell apoptosis is induced. The nano material can realize the synergistic treatment of CDT and PDT to induce cell apoptosis and enhance the anti-tumor effect. The material is expected to become a good nano-carrier for enhancing chemical dynamic therapy-photodynamic therapy.