Encapsulation of Uranium Oxide in Multiwall WS₂ Nanotubes

Area of Science:

• Materials Science
• Nuclear Engineering
• Nanotechnology

Background:

• Uranium is a valuable energy source but presents environmental challenges.
• Efficient and eco-friendly methods for uranium encapsulation are needed for safe storage and applications.

Purpose of the Study:

• To develop a straightforward, low-energy, and environmentally friendly method for encapsulating uranium species.
• To create nanocrystalline uranium dioxide (UO2) nanoparticles within WS2 nanotubes.

Main Methods:

• Utilized the low melting point of uranyl nitrate hexahydrate (60°C) and nanocapillary effects.
• Entrapped uranium compound within the hollow core of tungsten disulfide (WS2) nanotubes.
• Reduced the product at elevated temperatures in a hydrogen atmosphere.

Main Results:

• Successfully obtained nanocrystalline UO2 nanoparticles anchored within the WS2 nanotube lumen.
• Demonstrated the encapsulation of other heavy metal-nitrate hydrates within WS2 nanotubes.

Conclusions:

• The developed method provides an efficient route for producing UO2 nanoparticles.
• This technique is applicable for processing spent nuclear fuel, highly active radionuclides, and as a potential fuel for space missions.