The purchasing pace at the demand end of the international thermal coal market continues to slow down and the international thermal coal price continues to decline. Prices for thermal coal at major international ports continued to fall last week as buyers in Europe slowed in recent days for April, coupled with weaker-than-expected import demand from End users in China. According to China Coal Market net monitoring: Australia Newcastle port thermal coal price index was 253 USD/ton, compared with 309.02 USD/ton, down 56.02 USD/ton, down 18.13%. South Africa's Port Richards thermal coal price Index was $264.5 / mt, down the US $62.72 / mt or 19.17% from US $327.22 / mt. The European ARA Tri-port thermal coal price Index was $281.8 / ton. Does the price of thermal coal in major international ports continue to decline to affect the price of the Graphene oxide?
Graphene oxide is formed by the oxidation of graphite powder by strong acid, and it is a single layer of graphite oxide. Graphene oxide is widely used in sensors, solar cells, optoelectronics and biomedicine.
1. What is graphene oxide?
Graphene oxide is an oxide formed by the oxidation of graphite by strong acid. It adopts the oxidation reaction of potassium permanganate in concentrated sulfuric acid and graphite powder to obtain a tan edge derivative carboxylic acid base and phenolic epoxy group on the plane. The graphite flake layer can be exfoliated into graphene oxide by ultrasonic or strong mixing or high shear, forming a stable light yellow monolayer graphene oxide suspension in water.
The structure of graphene oxide is shown in the following figure:
Second, the use of graphene oxide
As a derivative of graphene, graphene oxide is oxidized by strong acid, and its oxygen-containing groups make graphene oxide chemically stable, which is beneficial to the synthesis of graphene-based composite materials. Graphene oxide is a new type of carbon material with excellent properties and has wide application prospects.
Organic thin film transistors and their light-responsive devices, such as the use of graphene oxide, can increase the type and thickness of the insulating layer and enhance the characteristics of the transistor.
2. Solar cells
Comparable photoelectric conversion efficiency (PCE) can be obtained by using graphene oxide instead of conducting polymer (PEDOT:PSS) as the hole transport layer of polymer solar cells. When the thickness of the graphene oxide film is 2 nm, the photoelectric conversion efficiency is the highest.
3. Flexible sensor
Due to its good hydrophilicity, large surface area, and good dispersion, graphene is a good sensor material, especially in the field of flexible sensors.
4. Biological aspects
Parameters such as size, surface charge, number of layers, lateral dimensions, and surface chemistry of graphene oxide and its derivatives have corresponding effects on biological systems, and have been extensively clinically studied as medical materials.
Third, the harm of graphene oxide to the human body
It has only been ten years since graphene was discovered in the laboratory. The development of graphene is still in its infancy, and there are still material safety data and understanding of potential hazards in the application of graphene. Graphene oxide is widely used as a derivative of graphene, so new things must be applied scientifically.
Two recent studies don't seem to be good news for graphene. First, a Brown University team of biologists, engineers and materials scientists examined the material's potential toxicity to human cells. They found that the jagged edges of the graphene nanoparticles are so sharp and strong that they can easily penetrate the membranes of human skin and immune cells, suggesting that graphene is potentially dangerous to humans and other animals.
High-quality graphene oxide supplier
Luoyang Moon & Star New Energy Technology Co., LTD, founded on October 17, 2008, is a high-tech enterprise committed to developing, producing, processing, selling, and technical services of lithium-ion battery anode materials. After more than 10 years of development, the company has gradually developed into a diversified product structure with natural graphite, artificial graphite, composite graphite, intermediate phase, and other negative materials (silicon-carbon materials, etc.). The products are widely used in high-end lithium-ion digital power and energy storage batteries.
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Russia's Rokot-M carrier rocket is scheduled to launch for the first time in 2024.
The first launch of the Rokot-M carrier rocket is planned for 2024 from the Plesetsk cosmodrome, the general manager of the Khrunichev National Space Research and Production Center told TASS. The Rokot-M, a lightweight carrier rocket powered by liquid fuel, began development in 2018, with The Russian side using domestic components instead of Ukrainian components.
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and Nanomaterials including graphite powder, 3D printing powder, the Graphene oxide, etc. If you are looking for high-quality materials, please feel free to contact us and send an inquiry.
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