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Chinese Academy of Sciences
Recently, Chinese scientists reported a new class of two-dimensional (2D) third-order nonlinear optical (NLO) materials, called metallated graphynes. The new material, exhibits broadband (at both 532 and 1064 nm) saturable absorption NLO property and high laser damage threshold.
Researchers prepared two free-standing mercurated graphyne nanosheets by applying an interface-assisted bottom-up method. The large-area nanosheets derived from the chemical growth have shown their layered molecular structural arrangement, controllable thickness and enhanced π-conjugation. The mercurated graphyne nanosheets are therefore having stable and outstanding broadband nonlinear saturable absorption properties.
With the help of the absorption ability, the metallated graphynes are acting as saturable absorbers. And it has better pulse properties and Q-switched performances, especially comparing with traditional 2D materials (like graphene, black phosphorus).
Chinese Academy of Sciences
Developing clean and low-carbon natural gas is a key point of the nation’s energy development strategy, and also an important measure to achieve “Carbon Neutral”. China’s natural gas reserves exceed 100 trillion cubic meters, while more than 70% of the reserves are unconventional dispersed sources (i.e. coal-bed methane, tight gas). By processing the unconventional dispersed natural gas sources, they are vented or burned directly which result in serious energy waste and environmental pollution.
It is of great social significance and economic benefit to develop skid-mounted Liquefied Natural Gas (LNG) plants for the gathering and transportation of dispersed natural gas sources. Current skid-mounted LNG technology is focusing on main-cooling process, but paying less attention to the pre-cooling stage. And it is found that pre-cooling stage by adopting Compression Refrigeration System (CRS) even consumes more than 20% of the total power consumption
China s large-scale cryogenic refrigeration technology, which is fundamental for important industrial sectors such as aerospace and hydrogen energy, has made a major breakthrough, with the ability to cool down -271C with hundred-watt level power.
China s major scientific research project for developing the large-scale cryogenic refrigeration system in liquid helium to superfluid helium temperature range has passed experts appraisal, Xinhua reported on Saturday. This project is supported by the Ministry of Finance and undertaken by the Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences (TIPC-CAS).
China can now develop large-scale cryogenic refrigeration equipment with a liquid helium temperature of 4.2K (-269 C) kilowatt level and superfluid helium temperature of 2K (-271C) hundred-watt level, a milestone which has broken technology monopoly by the developed countries, and made China s large-scale cryogenic refrigeration technology reach th
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