Unprecedented Radiation Resistant Thorium-Binaphthol Metal-Organic Framework

Area of Science:

• Materials Science
• Nuclear Engineering
• Chemistry

Background:

• Metal-organic frameworks (MOFs) are promising materials for various applications.
• Understanding the radiation stability of MOFs is crucial for their deployment in high-radiation environments, such as nuclear waste management.
• Thorium-organic frameworks (TOFs) represent a class of MOFs with unique properties.

Purpose of the Study:

• To synthesize and characterize a novel thorium-organic framework, TOF-16.
• To evaluate the radiation resistance of TOF-16 using gamma rays and helium ions.
• To assess the potential of MOFs for applications in nuclear waste streams.

Main Methods:

• Synthesis and characterization of TOF-16.
• Gamma irradiation of TOF-16 up to 4 MGy.
• Helium ion (He2+) irradiation of TOF-16 up to 25 MGy.
• X-ray diffraction analysis to assess structural integrity.

Main Results:

• TOF-16 exhibited no bulk structural damage after 4 MGy gamma irradiation.
• Crystallinity loss of TOF-16 began around 15 MGy He2+ ion irradiation.
• Complete loss of crystallinity occurred at approximately 25 MGy He2+ ion irradiation.
• This study represents the first He2+ ion irradiation of a MOF.

Conclusions:

• TOF-16 displays remarkable radiation resistance, comparable to materials used in nuclear waste environments.
• MOFs, in general, show potential for withstanding radiation exposure in nuclear waste streams.
• Further systematic studies are needed to design MOFs with enhanced radiation resistance.