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Researchers Find Ways to Stable Diamane Synthesized by High-pressure
Jun 29, 2022 | By NIU Caoping; ZHAO WeiweiNovel ways were found to enhance the stability of diamane synthesized by high-pressure method, according to a research team led by Prof. WANG Xianlong from Solid State Physics, Hefei Institutes of Physical Science (HFIPS) of Chinese Academy of Sciences (CAS).
The related results were published in Physical Review B.
"Though introducing B and N dopant into diamane, we found that the structural and electronic properties of diamane could be regulated," said NIU Caoping, first author of the paper.
Diamane is a two-dimensional single-layer diamond obtained by compressing bi-layer graphene to form interlayer sp3 bonds. With the characteristics of both graphene and diamond, it is expected to be a new two-dimensional carbon material alongside graphene. However, the diamane synthesized by high-pressure method is converted back to graphene after releasing pressure, and it cannot be maintained under ambient conditions.
In this research, researchers investigated the structural and electronic properties of different doped forms of B and N atoms in cubic and hexagonal diamane based on the first-principles methods.
They found that the doping configuration reduced the formation energy of diamane and promoted the synthesis of diamane, which enhanced the stability of diamane at ambient condition.
Researchers proposed an easiest mechanism to synthesize diamane experimentally by compressing bi-layer graphene with one layer doped with B atom and the other doped with N atom.
Diamane doped with N atoms was easy to achieve experimentally because the formation energy of diamane was not sensitive to the distribution of N dopant. In addition, depending on the concentrations and distributions of B and N atoms, doped diamane had variable electronic structures (semiconductor, metal, superconductivity ~ 4 K), which could be applied to the field of two-dimensional electronic devices.
This work proposed a new scheme to synthesize more stable and functional diamane.
This work was supported by the National Natural Science Foundation of China, and the calculations were performed in the Center for Computational Science of the Hefei Institutes of Physical Science of the Chinese Academy of Sciences.
Fig. 1 Configurations of cubic diamane (a) and hexagonal diamane (b). (Image by NIU Caoping)
Fig. 2 Formation energies of diamane with different doping methods at the concentration of 6.25 mol%. (Image by NIU Caoping)
Fig. 3 The bandgaps of different doping configurations. Bars with simple color represent the direct bandgap, and bars with slanted lines on the surface represent the indirect bandgap. The dashed red and blue lines show the bandgap of pristine cubic and hexagonal diamane, respectively. (Image by NIU Caoping)
Hendrik_2000
Lieutenant General
China need more and more of this coal conversion project since China is rich in coal deposit. And reduce Malacca strait vulnerability
China's largest coal-based ethanol project with an annual output of 500,000 tons was completed and put into trial operation in Yulin City of northwest China's Shaanxi Province on Thursday. The project uses coal as raw material to produce ethanol and other chemical products, and it can convert 1.5 million tons of coal every year. Experts said three tons of grain can produce one ton of ethanol and the project can save 1.5 million tons of bio-ethanol raw grain every year after it is completed and put into operation. This project produces ethanol through carbonylation of dimethyl ether, which is an international leading technology with independent intellectual property rights in China.
China's largest coal-based ethanol project with an annual output of 500,000 tons was completed and put into trial operation in Yulin City of northwest China's Shaanxi Province on Thursday. The project uses coal as raw material to produce ethanol and other chemical products, and it can convert 1.5 million tons of coal every year. Experts said three tons of grain can produce one ton of ethanol and the project can save 1.5 million tons of bio-ethanol raw grain every year after it is completed and put into operation. This project produces ethanol through carbonylation of dimethyl ether, which is an international leading technology with independent intellectual property rights in China.
They really don't. As I said in nev thread, china with all it's electric vehicles and renewables can be sufficient with just domestic, pipeline and Russian supplies. It's pretty much immune from Malacca straits getting cut off.
Hendrik_2000
Lieutenant General
Well oil is not only for transport but they also use it as base product for Petrochemical . Long haul transportation still need oil there is move to replace it with Hydrogen but it will be a while. China domestic source of hydrocarbon is only 30% the rest still imported oil. Oil from Russia and central Asia constitute very small percentage maybe only 10% .The bulk of oil still come from Middle east and Africa using ship!
The coal conversion plant is for ethanol production which can’t be mass produced from CO2+electrolysis yet. Ethanol can be used for other industrial applications.
Your suggestion is not different from what the windows alternative is doing.
The windows alternative is mostly built on Linux with WINE (open source adaptation layer) providing windows API to windows applications. The binary instructions are X86-64.
Android is sitting on top of Linux providing API, just like WINE does for Windows API. There is some small difference in how they work, but for applications the two behave the same.
In 2018, a Chinese scientist just announced the results of his successful "8-photon entanglement" experiment, and the scientific community was instantly boiling as if bombed by an atomic bomb. This is because this problem has plagued the quantum field for many years, and there has been no solution, but Lu Chaoyang completed such a difficult breakthrough in just three years.
In fact, this is the fourth time that he has broken the world record. Not only that, but also a series of records on the "multi-photon entanglement" problem that has disturbed experts before are all solved by Lu. For such a talent, the United Kingdom promised an annual salary of one million euros. but he rejected and said, he was Chinese and it was his land that give him nutrients. he returned back to China.