15 results about "Platinum nanoparticles" patented technology

The invention relates to the field of nano-enzymes, in particular to a nano-enzyme, a preparation method and a method for detecting glucose by using the nano-enzyme. The nano-enzyme comprises a carrier and platinum nano-particles coated on the surface of the carrier, and the carrier is oxidized nano-diamond particles with the particle size of 20-30 nm. The core structure of the nano-enzyme, namely a composite system of the carrier and the platinum nano-particles, is defined, the platinum nano-particles serve as a metal nano-material with excellent catalytic performance and are a core component for simulating peroxidase activity, the size of the oxidized nano-diamond carrier is controlled to be 20-30 nm, the dispersity of the material is guaranteed, and the catalytic activity of peroxidase is improved. And the catalytic efficiency of the composite system can be further improved through a size effect. According to the structural design, the problems of insufficient catalytic activity and poor stability of a single nano material are solved through the synergistic effect of the carrier and the load component, and a material foundation is laid for subsequent efficient glucose detection.

The invention discloses a preparation method of a platinum-carbon catalyst, which comprises the following steps: adding a metal oxide and a hydrophilic surfactant into deionized water to form a mixed pre-reaction solution; adding carbon powder subjected to hydrophilic treatment, uniformly dispersing to obtain a carbon dispersion liquid, adding an alcoholic solution into the carbon dispersion liquid, stirring, and carrying out hydrothermal or solvothermal reaction; a platinum precursor, a reducing agent and salt or organic matter providing an alkaline environment are added into deionized water to form a platinum precursor solution, a reducing agent solution and an alkaline precursor solution; adding into the treated carbon dispersion liquid; and carrying out acid treatment and water washing to obtain the platinum-carbon catalyst. According to the invention, a surfactant and an oxide are used for adjusting the distance between carbon-loaded platinum nano-metal particles, and a Pt / C precursor with high-loading platinum nano-particles dispersed on carbon carriers with different specific surface areas can be obtained, so that the growth of platinum particles is prevented in a hydrothermal or solvothermal process, and the particle size is controlled.

The application discloses HZSM-5 molecular sieve, a preparation method and application thereof, and belongs to the field of molecular sieve catalysts. The HZSM-5 molecular sieve comprises a flaky HZSM-5 molecular sieve base body and platinum nano-particles loaded on the flaky HZSM-5 molecular sieve base body; and the average thickness of the flaky HZSM-5 molecular sieve base body is 50-100 nm. The flaky HZSM-5 molecular sieve base body can provide acid centers, the platinum nano-particles can provide hydrogenation centers, and the two can cooperate to achieve good catalytic activity; and the flaky HZSM-5 molecular sieve base body has a relatively thin thickness, i.e. a relatively short b-axis channel length, which is not only beneficial to material diffusion and transmission, but also can greatly reduce the case that intermediate products contact acid sites to cause side reactions, and therefore can provide higher product selectivity. In particular, the HZSM-5 molecular sieve has a good application prospect in catalyzing bio-oil hydrodeoxygenation.

To provide a material exhibiting high blood retention capability, allowing temporal observation, having excretability from the body, and offering high biocompatibility.SOLUTION: A surface-modified metal-containing silica particle is characterized by containing, inside the particle, a plurality of biocompatible molecule-modified metal nanoparticles in which Au nanoparticles or Pt nanoparticles are surface-modified with a biocompatible molecule having a thiol group and an amino group and / or a carboxyl group, and is characterized in that polyethylene glycol chains are present on the particle surface.SELECTED DRAWING: Figure 6

The invention belongs to the technical field of catalysts, and relates to a high-activity platinum-carbon catalyst, a preparation method thereof and application of the high-activity platinum-carbon catalyst in catalytic purification of formaldehyde. The invention discloses a high-activity platinum-carbon catalyst which is of a core-shell structure and is characterized in that porous metal modified pore-expanded activated carbon M-AC is taken as a core, a TiO2 nano layer is deposited on the surface of the core, and Pt-coated TiO2 is loaded on the surface of the TiO2 nano layer; the metal M in the porous metal modified chambering activated carbon M-AC is one or two of alkali metals K and Na; the TiO2 nano layer on the surface of the porous metal modified chambering activated carbon M-AC is partially migrated to the surfaces of platinum nano particles to form Pt-coated TiO2. The invention further discloses the high-activity platinum-carbon catalyst which has a good formaldehyde catalytic purification effect.

The invention discloses a bowl-shaped nano composite material for capturing exosomes and a preparation method and application thereof.The preparation method comprises the steps that firstly, a mesoporous organic silicon bowl-shaped nano material MONB is prepared through a hard template method and a sol-gel method, then in-situ deposition of platinum nano particles and coupling of streptavidin are carried out, and the bowl-shaped nano composite material for capturing the exosomes is obtained. The nano composite material SA (at) Pt-MONB for capturing the exosome is obtained. The biotin-labeled exosome and SA-Pt-MONB are mixed and co-incubated to capture the exosome, and the captured exosome is further subjected to mass spectrometry, so that the exosome metabolic marker related to diseases can be obtained, and the exosome metabolic marker can be used for cancer diagnosis. The nano composite material provided by the invention has special bowl-shaped morphology, high specific surface area and ultraviolet absorption capacity, can efficiently and conveniently realize continuous exosome capture and metabolite analysis, and has wide clinical application potential, especially in disease diagnosis and prognosis evaluation.

Disclosed are catalysts having high activity, stability, and durability, methods for making, and fuel cells comprising the catalysts. The catalysts include nitrided ternary platinum (Pt) containing nanoparticles comprising platinum (Pt), nickel (Ni), and cobalt (Co) having an intermetallic L10 structure (IM-PtNiCON) loaded on a mesoporous carbon support comprising a predetermined hierarchical pore distribution architecture (MPC-HPDA). The nitrided ternary platinum (Pt) containing nanoparticles have an average particle diameter between about 3.0 nm and about 8.0 nm. The predetermined hierarchical pore distribution architecture of the mesoporous carbon support comprises a plurality of pores with a majority percentage of the plurality of pores having an average pore diameter between about 3.0 nm to about 8.0 nm, and at least a portion of the nitrided ternary platinum (Pt) containing nanoparticles is disposed within the majority percentage of the plurality of pores having an average diameter between about 3.0 nm to about 8.0 nm.

Provided is an electrochemical oxygen reduction catalyst comprising platinum-containing nanoparticles and at least one member selected from the group consisting of a specific polymer containing a melamine compound as a monomer and a specific melamine compound, the electrochemical oxygen reduction catalyst having not only high oxygen reduction activity (low overvoltage), but also high durability at 70 to 85° C., which are practical temperature conditions.

The present invention relates to an electrocatalyst comprising a Ti substrate coated with a 3D Cu nanostructured matrix decorated with a mixture of amorphous TiO2 and nanoparticles of a noble metal, preferably Pt nanoparticles, an electrochemical cell comprising said electrocatalyst and their use for hydrogen production via hydrogen evolution reaction (HER) in basic conditions. The present invention also refers to an in situ process for the preparation of said electrocatalyst and simultaneous production of hydrogen, comprising the steps of: (a) providing an electrochemical cell having a 3-electrode configuration comprising a starting working electrode which comprises a Ti substrate coated with vertically oriented CuO nanoplatelets, the cell further comprising a counter electrode and a reference electrode; (b) adding an aqueous basic electrolyte solution to the cell of step (a), said aqueous basic electrolyte solution comprising a precursor of a noble metal, preferably a Pt precursor; (c) applying a negative potential with respect to the reference electrode to the cell of step b).The present invention also refers to a process for producing hydrogen which utilizes the electrochemical cell comprising the electrocatalyst according to the invention.

The invention belongs to the technical field of virus detection, and particularly relates to nano-enzyme for detecting bovine nodular skin disease viruses and a preparation method and application thereof.The nano-enzyme is prepared by the steps that platinum nano-particles grow on the surfaces of gold nano-particles in situ, and then ORF122 protein is used as a solid-phase antigen for marking; a base sequence for coding the ORF122 protein is as shown in SEQ ID NO. 1. In the presence of H2O2, the nano enzyme disclosed by the invention is used for oxidizing TMB (Tetramethylbenzidine) into a blue substrate Ox-TMB. And then a detection antibody is fixed on the surface of Au (at) Pt, so that specific detection of the LSDV is realized.

The invention provides a monatomic platinum nano antibacterial agent as well as a preparation method and application thereof, and relates to the technical field of biomedical materials. The monatomic platinum nano antibacterial agent comprises monatomic platinum, nano particles and a surface ligand, the surface ligand is at least one of polyvinylpyrrolidone, polyethylene glycol and a modifier thereof, and a polyoxyethylene polyoxypropylene ether block copolymer; and the nano particles are nano-scale ZIF-8 (Zinc Induced Factor 8). The monatomic platinum nano antibacterial agent disclosed by the invention not only has good photothermal conversion capacity, but also has broad-spectrum active oxygen and free radical scavenging capacity, and due to the unique dual functions, the monatomic platinum nano antibacterial agent can efficiently kill drug-resistant bacteria, and meanwhile, inflammatory response is reduced by scavenging active oxygen to promote wound healing; and the antibacterial agent has good biological safety, and has a wide application prospect in treatment of wounds infected with drug-resistant bacteria.

The invention provides a nitrogen dioxide sensor as well as a preparation method and application thereof, and relates to the technical field of gas sensors. The nitrogen dioxide sensor provided by the invention comprises a silicon oxide substrate, a zinc oxide step arranged on the surface of the silicon oxide substrate, a conductive layer covering the top of the zinc oxide step and an interdigital electrode deposited on the surface of the conductive layer, a zinc oxide nanowire array modified by precious metal nano-particles grows on the side surface of the zinc oxide step, and the precious metal nano-particles comprise palladium and / or platinum nano-particles. According to the invention, the integration of the sensitive material (the precious metal nanoparticle modified zinc oxide nanowire array) is directly carried out on the silicon oxide substrate of the sensor chip, and the integrated sensor is provided, so that the consistency and reliability of the device are improved; and the constructed nitrogen dioxide sensor shows excellent nitrogen dioxide sensitive characteristics (high sensitivity, high selectivity and high stability).

Disclosed in the present application are an anode composite catalyst layer and a slurry thereof, a preparation method, and a membrane electrode. The anode composite catalyst layer is located between a proton exchange membrane and a gas diffusion layer of the membrane electrode, and comprises: an iridium catalyst layer, which has a first surface and a second surface which are opposite to each other, wherein the first surface faces the proton exchange membrane, and the second surface faces the gas diffusion layer, and the iridium catalyst layer comprises a first ionomer and an iridium catalyst dispersed in the first ionomer; and a platinum-conducting layer, which has a third surface and a fourth surface which are opposite to each other, wherein the third surface is in contact with the second surface of the iridium catalyst layer, and the fourth surface faces the gas diffusion layer, and the platinum-conducting layer comprises a second ionomer and platinum nano-particles which are dispersed in the second ionomer and have a particle size of 10-500 nm. The anode composite catalyst layer of the present application can endow the membrane electrode with a relatively low contact resistance and excellent stability.

[Problem] To provide a water electrolysis anode catalyst capable of reducing an increase in hydrogen concentration caused by cross leakage in the anode of a membrane electrode assembly of a water electrolysis apparatus. [Solution] The present invention pertains to a water electrolysis anode catalyst in which platinum fine particles are supported on a base catalyst having an oxygen evolution activity. A base catalyst of the present invention contains a metal or a metal compound that has a higher oxygen evolution activity than platinum. The platinum fine particles supported on the base catalyst have an average particle diameter of 1-55 nm. In the particle size distribution of the platinum fine particles supported on the base catalyst, the number-based cumulative 90% particle diameter is preferably 90 nm or less.