In recent years, precious metal-titanium dioxide core-shell structure nanoparticles have attracted wide attention in the academic community. On the one hand, noble metal is used as the core material to cut the energy band structure of the outer layer titanium dioxide semiconductor material to absorb the edge visible light direction; on the other hand, when noble metal particles and titanium dioxide are in contact, the electrons migrate on both surfaces. This will change. The end result is an excessive amount of negative charge on the metal surface. The semiconductor gains an excessive amount of holes. The electrons and holes are in two different phases, inhibiting the recombination of photogenerated electrons and holes. The use efficiency of electronic pairs of transitions. The researchers of the Institute of Physical and Chemical Technology of the Chinese Academy of Sciences invented a copper-titanium dioxide core-shell type nanoparticle preparation method. This method utilizes the copper ion provided by the cuprous chloride to dissolve in ammonia water, adding the aqueous polyethylene glycol solution and sodium citrate. Aqueous solution, aqueous solution of ascorbic acid, tetrabutyl titanate solution (absolute ethanol) and urea were stirred in room temperature and placed in a stainless steel hydrothermal retort lined with PTFE. The temperature and time of the thermal reaction of the mixed solvent were controlled. Near-spherical core-shell nanoparticles were prepared. In this method, ascorbic acid acts as a reducing agent to reduce monovalent copper ions, and polyethylene glycol is a soft template. The preparation method has the advantages of simple process, environmental friendliness, low cost, and the like. The outer layer of the prepared copper-titanium dioxide core-shell type nanoparticle is anatase titanium dioxide, and the inner layer is cubic phase copper single substance, and the size distribution is uniform and the particle size is controllable. It can be used as electrode material and photocatalyst material for dye-sensitized solar cells. This method has been authorized by the national invention patent on May 2. The patent number is: ZL 201110258150.9.
Refers to the part between the connected part and the nut. Generally, flat metal rings are used to protect the surface of the connected parts from being scratched by the Nuts and to disperse the pressure of the nut on the connected parts.
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