Nitrogen-doped graphene quantum dots (QDs) have low toxicity, good water solubility, and high photostability, making them more and more widely used in optoelectronic devices, photocatalysis, sensing, and bioimaging. The rapid preparation of nitrogen-doped graphene quantum dots and simple separation are of great significance to the above research fields.

Institute of Environmental Science and Technology, Xinjiang Institute of Physics and Chemistry, Chinese Academy of Sciences Researchers use high-nitrogen-content, surface-specific metal-organic framework compounds (MOFs) to guide porous carbon materials as starting materials, using a unique nitric acid vapor strategy, quickly and easily. Nitrogen-doped graphene quantum dots with uniform particle size and abundant surface functional groups were obtained. The fluorescence sensor was constructed using the quantum dot as a fluorescent probe, and a sensitive, rapid, and specific detection of iron ions was realized. The detection limit was as low as 80 nM. This study also shows that by selecting appropriate metal-organic framework compound-oriented carbon materials, it is expected that other heteroatom-doped graphene quantum dots can be quickly and easily prepared, which greatly broadens the application range of MOFs-based materials.

The research results have been published in the Journal of Materials Chemistry C. The related research work has obtained the "Hundred Talents Program" of the Chinese Academy of Sciences, the "Light of the West" of the Chinese Academy of Sciences, the National Natural Science Foundation, the Xinjiang Youth Uyghur Autonomous Region Youth Science and Technology Innovation Talent Training Project, and international cooperation projects. Funding.

DUPLEX STAINLESS STEEL

Duplex Stainless Steels Available

Yuhong Group supplies LDX2101, 2205, Ferralium 255, Zeron 100 and LDX2507 in the form of plate, sheet, strip, bar, pipe, tubing, pipe fittings, flanges and weld wire.

Duplex Stainless Steel Overview

Duplex Stainless Steels, also referred to as austenitic-ferritic stainless steels, are a family of grades with about equal proportions of ferrite and austenite. These steels have a duplex microstructure which contributes to their high strength and high resistance to stress corrosion cracking. Due to their high content of chromium, nitrogen and molybdenum, duplex steels offer good resistance to local and uniform corrosion. Duplex stainless steels have good weldability.

Today, modern duplex stainless steels can be divided into three groups:
Lean Duplex such as LDX2101
Standard Duplex such as 2205, the work-horse grade accounting for more than 80% of duplex usage
Super Duplex such as Ferralium 255 and Zeron 100 and LDX2507

Of the duplex grades, duplex 2205 is the most widely used. However, the super duplex steels like Zeron® 100 and LDX2507 are excellent for servicing severe corrosive environments, such as offshore and marine applications. Lean duplex 2101 is available as an economic alternative to 300 series stainless steels.

What are the Characteristics of Duplex Stainless Steels ?
Very good resistance to uniform corrosion
Very good resistance to pitting and crevice corrosion
High resistance to stress corrosion cracking and corrosion fatigue
High mechanical strength
Good sulfide stress corrosion resistance
Good abrasion and erosion resistance
Good fatigue resistance high energy absorption
Low thermal expansion
Good weldability

In what Applications are Duplex Stainless Steels® used ?
Oil and gas equipment
Offshore technology
Seawater desalination plants
Chemical industry, especially when handling chlorides
Flue-gas cleaning
Desalination plants and seawater systems
Pulp and paper industry
Cargo tanks and pipe systems in chemical tankers
Firewalls and blast walls on offshore platforms
Bridges
Storage tanks
Pressure vessels, reactor tanks, and heat exchangers
Rotors, impellers and shafts

Super Duplex Steel Pipe

Super Duplex Steel Pipe,Super Duplex Stainless Steel Pipe,304 Super Duplex Steel Pipe

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