31 results about "Metallic clusters" patented technology

The invention provides a variable-wave-length two-dimensional optical rotation device with controllable polarizability and a preparation method of the variable-wave-length two-dimensional optical rotation device, and relates to generation of continuously adjustable wave length rotation light and regulation and control of polarizability. The device is based on a III-VI group chalcogenide two-dimensional material and a ferromagnetic metal clustering heterostructure, a ferromagnetic metal layer injects a spin polarization current carrier into the III-VI group chalcogenide two-dimensional materialvia an interface coupling effect, and by control over the morphology and dimensional of ferromagnetic metal clusters in the ferromagnetic metal layer, the directions of magnetic moments in the ferromagnetic metal clusters and the magnetic coupling effect of the ferromagnetic metal clusters and the III-VI group chalcogenide two-dimensional material are adjusted; and the band gap width of the III-VI group chalcogenide two-dimensional material is adjusted further through an additional perpendicular electric field, thus, the device generates an optical rotation effect which has controllable spinpolarizability under excitation of incident light, and the wavelength of the optical rotation effect is continuously adjustable in a broad band range from ultraviolet rays to infrared rays.

The present invention discloses stable, non-agglomerated, ultra-small metal / alloy clusters encapsulated in silica with the metal / alloy cluster size of less than 5 nm. The invention further discloses a simple, cost effective process for the preparation of metal / alloy clusters encapsulated in silica which is thermally stable and without agglomeration.

A method of transferring a single metal atom from a first location to a second location on the surface of a metal oxide is disclosed. The method includes obtaining a material having a first metal atom deposited on a first oxygen atom vacancy of the metal oxide and transferring the first metal atom of the metal on the first oxygen atom vacancy to a second location on the metal oxide by applying a voltage to the first metal atom. The second location can be a second metal atom on a second oxygen atom vacancy of the metal oxide, where the first and second metal atoms form a first metal atom-second metal atom species, or a metal atom of the metal oxide, where the first metal atom and the metal atom of the metal oxide forms a first metal atom-metal atom of the metal oxide species.

The invention discloses a preparation method for a photostable catalyst of metal cluster and an application thereof. A surface nature regulation and / or interface modification combined strategy is adopted for promoting photostability of metal cluster; hydroxy content on titanium dioxide surface is reduced by coating fluorine ions, so that the aggregation of metal cluster can be reduced; on this basis, the material surface is modified with polymine, so that the photostability of metal cluster can be further promoted; under irradiation of visible light, the catalyst shows excellent activity and stability for photo-catalytically reducing hexavalent chromium. The preparation method is simple and practicable and the catalyst is low-cost and can be conveniently recycled, so that the compound photocatalytic material has high practical value and application prospect in the technical field of material preparation and the field of environmental pollutant treatment.

The invention discloses a metal cluster-based crystalline porous material and a preparation method thereof. The metal cluster-based crystalline porous material contains an aldehyde group-containing ring trinuclear metal cluster precursor and an organic ligand. The preparation method is as follows: firstly, the precursor of ring trinuclear metal clusters containing aldehyde groups is prepared by solvothermal synthesis or diffusion method; then, the ring trinuclear metal clusters containing aldehyde groups The cluster precursors are linked with organic ligands to obtain metal cluster-based crystalline porous materials linked by carbon-carbon double bonds. In this inorganic-organic composite material, the metal clusters as active sites can be evenly distributed on the framework of the porous material, which solves the problem that it is difficult to make the metal evenly distributed in the current technology of introducing metal into COFs. In COF materials, it has broad application prospects for the limited performance improvement of COFs.

The invention relates to a surface modification method of a metal-organic framework adsorbing materials. Metal-organic framework porous adsorbing materials (MOFs) are subjected to chemical treatment in a plurality of steps, so that the adsorptive property on non-polar organic gas molecules in presence of water molecules can be improved. The preparation method of the materials comprises the following steps: firstly, putting to-be-modified MOFs into a tube furnace, and introducing nitrogen to ensure no residual air inside; introducing a certain amount of pure pyridine (C5H5N) into the tube furnace together with the N2, and reacting at certain temperature; cooling a reaction tube containing the MOFs to below 50 DEG C, and introducing N2 to the tube furnace; and after desorption is ended taking out and encapsulating the modified MOFs for later use. The metal-organic framework porous adsorbing materials are simple in modification process and high in operability; and the problems of adsorptive property degradation and internal structure damage of the non-polar organic gas molecules caused by hydrophilia of metallic clusters in MOFs porous materials can be solved by the MOFs prepared by the method.

The present invention is a method for predicting the wettability between graphene and metal with introduced defects. Based on the density functional theory of first principles, the adsorption energy and bond between graphene and metal clusters introduced with different kinds of defects are calculated by calculating. energy, structural changes, and predict the wettability between them. The defects introduced by graphene are mainly point defects, doped Ni defects, and Ni adsorption defects. Calculate them separately from metallic Cu 13 Cluster or Al 13 The adsorption energy, bond energy and structural changes after cluster adsorption, it is found that the introduction of graphene defects can improve the wettability between graphene and metal, especially the wettability between graphene and metal doped with Ni atoms significantly improved. The present invention can also effectively predict and analyze the wettability between the objects introduced with different defects and the metal according to the difference of the introduced defects or the different objects of the introduced defects.