[ Instrument Network Instrument R & D ] Recently, the Nano Regulation and Biomechanics Research Center of the Institute of Medical Technology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences has made new progress in the research of 2D-2D two-dimensional ultra-thin heterojunctions. Related results are based on From one to two: In situ construction of an ultrathin 2D-2D closely-bonded heterojunction from a single-phase monolayer nanosheet (`` 2D-2D "Quotations") was published in the Journal of the American Chemical Society. Dr. Xing Zheng of Israel Institute of Technology, Hu Jun, an associate professor of Northwest University, and Ma Ming, an associate researcher of Shenzhen Advanced Institute, are co-first authors, and Yang Shihe, a professor at Shenzhen Graduate School of Peking University, and Li Jiangyu, a researcher of Shenzhen Advanced Institute, are the corresponding authors.
So far, the synthesis and preparation of nanomaterials have been precisely controlled in terms of their composition, size and morphology. Various nanoscale preparation methods have also been skillfully developed, such as plasma, metal nanoparticles, and metal. Preparation and synthesis of chalcogenide quantum dots and multi-component nanoparticles. At the same time, with the maturation of preparation techniques and methods, the preparation of nanoscale materials at the atomic level can be achieved using wet chemical synthesis, including two-dimensional nanosheets with atomic lines and atom thickness, such as graphene, transition metal dihalides (TMD) and transition metal oxides. Researchers from various countries have carried out various attempts to build 2D-2D ultra-thin heterostructures by wet chemistry methods. However, 2D-2D composite materials still require more complicated preparation processes and generally show a weak interface bonding state. Therefore, reasonable design ideas and simple and efficient preparation methods are the keys to the construction of 2D-2D ultra-thin heterostructures.
This research has developed a mild chemical synthesis method that achieves the in-situ growth of Bi2O2S in a single layer of Bi2WO6, thereby assembling and preparing ultrathin two-dimensional heterojunction nanosheets. The strong interfacial binding in the two-dimensional heterojunction nanosheet makes it have characteristics similar to macromolecules, and it is also the main factor that causes the charge carrier separation efficiency to be greatly improved. Compared with pure Bi2WO6 nanosheets, ultra-thin two-dimensional heterojunction nanosheets achieve more than 4 times the photocurrent response, while generating more than 8 times the hydrogen in the photocatalytic water decomposition system. In addition, the heterojunction can achieve full visible light absorption and cause the photoanode starting potential to shift to a more negative direction. The method is also expected to be applied to other bismuth-containing materials, including Bi2O2CO3, bismuth oxyhalides (BiOI, BiOBr, etc.), and oxygen-containing chalcogenides containing [Bi2O2]. For the development of advanced catalysts, batteries, and energy conversion devices, etc. Is of great significance.
The reducer is also called big head, reducer, and straight through. One of the chemical fittings is used for connection between two pipes with different diameters. According to the different shapes, they can be divided into two types: concentric small head and eccentric big head. The material of big head includes stainless steel big head, alloy steel, carbon steel big head.
Manufacturing standards can be divided into national standard, electric standard, shipping mark, chemical standard, water mark, American Standard, German standard, Japanese standard and Russian standard.
It can be divided into pushing, pressing, forging, casting and so on.
Connection mode: clamp (fast mounting), welding type and thread type.
Quality and use: the big head and outside with high grade polishing equipment to meet the surface precision requirements; this product is suitable for dairy, food, beer, beverage, pharmaceutical, cosmetics and other industrial fields.
Note that the small head is also suitable for environmental protection and dust removal industry, the pipe diameter is generally rolled and welded by steel plate, and the diameter is different.
Generally, hot rolled coil is applied very well, and it can save cost.
External processing: we can map and sample non-standard products according to user requirements.
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