52 results about "Bimetallic nanoparticle" patented technology

The invention provides a nano-drug based on atomic layer deposition and a preparation method of the nano-drug, mesoporous silica is taken as a carrier, bimetallic nanoparticles are precisely deposited through ALD, and chemotherapeutic drugs and antibacterial components are loaded by combining amination and targeted PEG modification, so that the following functions are realized: (1) H2O2 in a tumor microenvironment is catalyzed to generate reactive oxygen species (ROS); removing fusobacterium nucleatum and damaging a biological membrane of the fusobacterium nucleatum; (2) GSH is consumed through Fenton reaction, and tumor drug resistance is reversed; and (3) the drug is released in pH response, and tumor cells are accurately killed. The invention further provides application of the nano-drug based on atomic layer deposition in treatment of related drug-resistant colorectal cancer induced by fusobacterium nucleatum, the process is controllable, the biocompatibility is excellent, the treatment effect on the drug-resistant colorectal cancer is remarkably improved, and the nano-drug has wide clinical application prospects.

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 relates to a preparation method of a carbon-based gold-containing bimetallic catalyst. The specific method comprises the following steps: carrying out secondary doping on eigenstate polyaniline, carrying out high-temperature pyrolysis in an inert atmosphere to obtain a heteroatom-doped carbon-based carrier, and changing the variety, the content and the distribution of heteroatoms on the carbon surface of the carrier by adjusting the variety and the content of acid. And preparing gold-containing bimetallic nanoparticles by using a colloid method, and depositing bimetallic particles by virtue of adsorption of the carbon carrier and bimetallic to obtain the carbon-based gold-containing bimetallic catalyst. Wherein the doping element can anchor and disperse the noble metal, and the introduced second metal can improve the hydrogenation activity of the catalyst. The catalyst is simple in preparation process, good in activity, excellent in selectivity and excellent in cycling stability, is particularly suitable for a reaction for preparing 4-chloroaniline through catalytic hydrogenation of 4-chloronitrobenzene, and has good application potential.

The invention provides a composite catalyst for supercritical water gasification hydrogen production and a preparation method and application thereof, and relates to the technical field of organic solid waste recycling, the composite catalyst comprises a carrier, an active component and an auxiliary agent; the carrier is prepared from a ZrO2 mesoporous material co-doped with Ce and La; the active component comprises Ni-Co bimetallic nanoparticles, and the Ni-Co bimetallic nanoparticles are subjected to vulcanization treatment to form a core-shell structure in which Ni-Co metal is wrapped by sulfur; and the auxiliary agent comprises MoO3. According to the composite catalyst, a Ce-La-ZrO2 mesoporous material serves as a carrier, Ni-Co bimetallic nanoparticles serve as an active component, a core-shell structure (NiCo at S) is formed after vulcanization treatment, the surface of the core-shell structure is covered with a layer of sulfur atoms, carbon deposition can be effectively inhibited, the chlorine poisoning resistance of the catalyst is enhanced through the added MoO3 auxiliary, and the service life of the catalyst is prolonged.

The application discloses a method for activating persulfate for improving the degradation performance of organic pollutants based on a flow-through electrocatalytic membrane, which comprises two steps of preparing a boron nitride electrocatalytic membrane loaded with bimetallic nanoparticles and carrying out a flow-through degradation reaction. Compared with a traditional mode, the flow-through mode provided by the application realizes effective coupling of a membrane catalytic system and a conventional electro-activated persulfate system, breaks through the limitation of low mass transfer efficiency, significantly improves the utilization rate of persulfate, and thus improves the degradation efficiency of organic pollutants. The flow-through reactor provided by the application has the advantages of simple structure, strong operability, low catalyst loss and good stability, has a wide industrial application prospect, and provides an efficient, economical and sustainable solution for the degradation of organic pollutants.

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.

The invention belongs to the field of deep processing of grease, and particularly relates to a lipase immobilization method based on a bimetallic nanoparticle and chitosan composite material. The prepared nano hybrid material is large in specific surface area, high in surface activity, easy to modify and capable of providing more binding sites for enzyme and improving the immobilization efficiency and catalytic performance. According to the preparation method provided by the invention, the metal nanoparticles are added, so that the mechanical strength of the lipase can be enhanced, and the catalytic efficiency and the stability of the lipase can be further improved by adjusting the size, the shape and the surface modification of the nanoparticles. In addition, through compounding of the nanoparticles and the organic material, the flexibility and adjustability of the carrier material can be improved, and a nano hybrid material with mechanical properties and biological compatibility is formed. Chitosan is used as a biodegradable polysaccharide organic material, has rich amino groups and hydroxyl groups, can provide multiple active binding sites for enzyme, and can form a composite carrier material with high mechanical strength and thermal stability after being compounded with metal nanoparticles.

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 present invention relates to a magnetic fish scale-based biochar and a preparation method thereof, as well as its application in degrading antibiotic wastewater. Cheap discarded fish scales are used as raw materials, which are modified by decalcification, crushing, and activation using an activator transition metal acetate. After freeze-drying, the pore structure is optimized by high-temperature pyrolysis to form a multi-activation site catalyst with surface-loaded bimetallic nanoparticles. The rapid electron transfer effect between carbon and transition metals is utilized to produce a large amount of active substances, thereby obtaining magnetic fish scale-based biochar with a high specific surface area and high saturation magnetization. The preparation method has simple and easy steps, low raw material cost, short production cycle, easy control of production process conditions, conventional equipment required, strong practicality and operability, and can be promoted and applied in large-scale industry. The application of the modified magnetic fish scale-based biochar in the treatment of antibiotic wastewater can effectively remove antibiotics in water and reduce the toxicity of wastewater.

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 invention discloses a copper-cobalt-loaded ferric oxide composite photocatalyst, a preparation method and application of the copper-cobalt-loaded ferric oxide composite photocatalyst in hydrogen production by photocatalytic ammonia borane hydrolysis, and belongs to the technical field of photocatalysts. The composite photocatalyst (CuxCoy-alpham-gamman-Fe2O3-R, m + n = 100, x + y = 100, and both x and y are not 0) takes Fe2O3 as a core and copper-cobalt bimetallic nanoparticles reduced by sodium borohydride as an active component, and efficient hydrogen production by ammonia borane hydrolysis is realized through a photocatalysis synergistic effect. The method is simple in synthesis step, small in pollution, low in equipment requirement, mild in reaction condition and easy to implement. Under illumination, strong reducing electrons are generated on the surface of the catalyst, the hydrolysis activation energy is remarkably reduced, the hydrogen production rate reaches 21875 mL.min <-1 >. G <-1 > and is increased by 258% compared with that without illumination, the hydrogen yield can reach 100%, and the activity of the composite photocatalyst is not attenuated after 10 times of circulation after magnetic recovery.

The invention discloses a photochemical controllable deposition method based on copper-silver bimetallic nanoparticles, and relates to the technical field of nano material preparation, and the photochemical controllable deposition method comprises the following steps: constructing a light excitation-molecular conformation regulation-acoustic streaming diffusion three-dimensional coupling system by utilizing the cooperative regulation of a light response biomolecule dynamic template and an acoustic oscillation microbubble field; the photoresponse biomolecule dynamic template is used for regulating and controlling an atomic-scale interface structure, and the acoustic oscillation microbubble field is used for homogenizing a metal ion diffusion environment; through excitation of dual-wavelength circularly polarized light, silver core formation, copper atom spiral deposition and three-dimensional nanowire array assembly are realized in sequence; in the invention, through cooperation of the photoresponse template and the acoustic microbubble field and excitation of dual-wavelength circularly polarized light, the problems of heavy pollution, difficulty in interface regulation and control and photodeposition three-dimensional construction bottleneck of a traditional wet chemical method are solved, and atomic order of a bimetallic interface, improvement of deposition uniformity and controllable assembly of the vertical alignment nanowire array are realized; and the method has the green process advantages of low pollution and no strict template removal.

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.

A method for preparing platinum-based lanthanum cobalt oxide catalysts for NO oxidation is disclosed, belonging to the fields of catalytic chemistry and environmental chemistry. PtMn bimetallic nanoparticles are supported on a lanthanum cobalt oxide support, and PtMn / LaCoO3-air + steam and PtMn / LaCoO3-nitrogen + steam catalysts are obtained after hydrothermal treatment. The preparation method is as follows: Platinum acetylacetone and manganese decacarbonyl are simultaneously reduced using an oil-phase reduction method to form PtMn bimetallic nanoparticles. The PtMn nanoparticles are then loaded onto the lanthanum cobalt oxide support using an impregnation method. The loaded catalyst is placed in a tube furnace and calcined at 650℃ for 8 hours in an air or nitrogen atmosphere containing H2O to form a catalyst. The obtained catalyst contains a richer content of active oxygen species and exhibits good catalytic activity for NO oxidation under low-temperature conditions, showing promising application prospects in the field of motor vehicle exhaust pollution control.

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 provides a biosensor, a nucleic acid detection and typing system based on a CRISPR system, a detection method and application, and belongs to the technical field of biological detection, alkaline phosphatase is adopted for catalyzing hydrolysis of p-aminophenyl phosphate to obtain p-aminophenol, the p-aminophenol is used for reducing silver ions, metal silver is deposited on the surfaces of gold nanoparticles, and the gold nanoparticles can be used for detecting the nucleic acid. Compared with a traditional Cas12a detection method combining ALP mediated p-nitrophenyl phosphate hydrolysis, the CRISPR / Cas12a biosensing strategy combining ALP has the advantages that the sensitivity is improved by 10,000 times, target DNA can be detected through naked eyes, the detection limit is as low as 300 aM, and the potential of no instrument application is shown.

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 invention relates to the technical field of biological detection, in particular to a system for detecting oxidized low-density lipoprotein and a detection method. According to the PLA-HCR metallization system provided by the invention, an AND logic gate is constructed based on a proximity effect, and is combined with a hybridization chain reaction to realize direct recognition and signal amplification of oxLDL complete particles, so that the limitation that the concentration of lipoprotein particles is indirectly reflected only by depending on a single component in a traditional method is overcome; according to the system, high-efficiency exogenous peroxidase catalytic activity is endowed to oxLDL particles by using gold-platinum bimetallic nanoparticles, compared with traditional peroxidase, the enzyme catalytic efficiency is remarkably improved, the system has the capability of directly detecting an undiluted serum sample, and the tedious pretreatment process of a traditional ELISA method is avoided. The kit has the characteristics of high specificity, wide detection range, simplicity and convenience in operation and the like, and has wide application prospects in early diagnosis, curative effect monitoring and prognosis evaluation of atherosclerotic cardiovascular disease patients.

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 belongs to the technical field of potassium metal batteries, and particularly relates to a preparation method of a biomass carbon encapsulated bimetallic nanoparticle potassium metal battery negative electrode material, which comprises the following steps: by taking ginkgo leaf powder as a raw material, carrying out primary hydrothermal reaction to obtain a biomass derived carbon material; taking a transition metal salt and a biomass derived carbon material, and carrying out a second hydrothermal reaction to obtain precursor powder; performing high-temperature pyrolysis on the precursor powder in a protective atmosphere to obtain biomass carbon encapsulated bimetallic nanoparticles; the preparation method comprises the following steps: uniformly coating a copper foil with biomass carbon packaged bimetallic nanoparticles serving as an active substance, a conductive agent and a binder to obtain the copper foil loaded with the active substance; according to the preparation method, a copper foil loaded with an active substance is taken as a working electrode, a potassium metal sheet is taken as a counter electrode, KPF6 / EC-DEC is taken as an electrolyte, and an electrochemical deposition method is adopted. The potassium metal battery negative electrode material can significantly reduce the nucleation overpotential of the potassium metal battery, improve the coulombic efficiency of the battery and prolong the cycle life of the battery.

The application provides a palladium-based bimetallic nanocatalyst and a preparation method and application thereof, and relates to the technical field of carbon dioxide hydrogenation catalyst preparation. The catalyst is prepared by a two-step reduction method, and comprises a TiO2 carrier and bimetallic nanoparticles loaded on the TiO2 carrier, wherein the bimetallic nanoparticles are composed of Pd and M, and M is one of Cu, Zn and Fe. The catalyst prepared by the method has high carbon dioxide conversion rate and high selectivity of low-carbon mixed alcohol in the reaction of preparing low-carbon mixed alcohol by carbon dioxide hydrogenation.

The invention relates to the technical field of nanomedicine and functional material crossing, and discloses a bimetallic nanoparticle and a preparation method and application thereof.The bimetallic nanoparticle comprises metal A and metal B and is coated with protein polypeptide substances, and the preparation method comprises the steps that the protein polypeptide substances are evenly suspended in water, a metal solution and a carbonate solution are added, and then the pH of the solution is adjusted to be alkaline; the preparation method comprises the following steps: adding a proper reaction temperature, a proper time and a reaction system, dialyzing, freezing and drying to obtain bimetallic nanoparticles, using an ultrafiltration centrifuge tube to obtain the bimetallic nano quantum dots, and applying the bimetallic nanoparticles to regeneration and repair of tumor and tissue damage, osteolysis related to prosthesis, and treatment of cardiovascular and metabolic diseases. The bimetallic nanoparticles have the advantages of good repeatability, uniform particle size distribution, controllable structure, multiple functions and excellent biocompatibility, solve the problem of poor targeting property of existing drugs, are suitable for the fields of precise treatment and drug delivery, and also have application prospects in many fields of daily chemicals, batteries, environmental protection and the like.

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.