〠Instrument R&D of Instrument Network 】Recently, Wang Hui, a researcher of the Strong Magnetic Field Science Center of the Hefei Institute of Material Science, Chinese Academy of Sciences, and Lin Wenchu ​​have made new progress in the field of graphene quantum dots (GQDs) synthesis based on organic solvents: research and development of organic structures with specific structures Solvents (double bonds, benzene rings, or multipolar groups) can be directly carbonized and form GQDs. The relevant results are published in the international journal "Nanoscale" under the title of Direct carbonization of organic solvent toward graphene quantum dots.
In recent years, GQDs have attracted great attention in the field of biomedicine due to the characteristics of material stability, biocompatibility, fluorescence tunability, and easy removal by the kidney. Due to the ease of the synthesis process, the multi-selectivity of the precursor types and the in-situ control capability of the physical and chemical properties, the solvothermal decomposition of organic molecules is one of the main methods for "bottom-up" preparation of GQDs. In the conventional understanding, the organic solvent functions to disperse the precursor and provide the reaction solution system in the reaction system. However, the organic solvent itself is also a small molecule, and it is not known whether it is decomposed during the synthesis of GQDs.
The researchers used common organic solvents as a single precursor without adding catalysts and other organic precursors, and systematically studied the effect of high-temperature sealing conditions on the stability of organic solvents. The results show that organic solvents with a specific structure (double bonds, benzene rings or polypolar groups) can be directly carbonized and form GQDs under high temperature solvothermal conditions. In addition, by adjusting the types of organic solvents, the surface groups, in-situ doping and optical properties of GQDs can be easily adjusted at the molecular level. The research results provide a new idea for further understanding the possible formation mechanism of solvothermal synthesis of nanomaterials.
The research work was supported by the National Natural Science Foundation of China, Hefei Research Institute Start-up Fund, Hefei University Science Center Collaborative Innovation Cultivation Fund, Chinese Academy of Sciences Key Laboratory of Photovoltaic Materials and Energy Saving, Modern Biomanufacturing Anhui Key Laboratory, etc.
The automatic Steel Bar Bending Machine can automatically complete the straightening, sizing, bending and forming and cutting of steel bars. The processing capacity is very comprehensive. It can bend in both directions and freely control the expansion, up and down of the mandrel, so it can process more and more complex shapes. With the continuous development of the CNC industry, more and more industries and companies have used CNC bending machines.
The automatic Hoop Bending Machine is mainly suitable for the hooks and hoops of cold-rolled ribbed steel bars, hot-rolled three-level steel bars, cold-rolled round bars and hot-rolled round bars. The hoop bending machine has the advantages of low equipment failure rate, fast bending speed, low energy consumption without damaging ribs, low noise, light vibration, high efficiency, application, and reliable operation. Single operation, light and flexible, 6-10 times that of manual bending.
Reinforcement Bar Bending Machine
Steel bar bending machine, Rebar Bending Machine, CNC Automatic Tube Bender, Steel Stirrup Bending Machine
Borong Machinery Manufacturing CO. LTD , https://www.boronjx.com