Radiolysis and Radiation-Driven Dynamics of Boehmite Dissolution Observed by In Situ Liquid-Phase TEM

Area of Science:

• Materials Science
• Radiation Chemistry
• Nanotechnology

Background:

• Boehmite (aluminum oxyhydroxide) radiation stability is studied, but radiation effects on its dissolution are less understood.
• Investigating radiation-induced changes in boehmite dissolution is crucial for understanding its behavior in irradiated environments.

Purpose of the Study:

• To investigate the impact of electron radiation on boehmite dissolution behavior.
• To examine how electron flux and dose rate influence the dissolution of single boehmite nanoplatelets and aggregated stacks.

Main Methods:

• Utilizing liquid-phase transmission electron microscopy (LPTEM) to observe boehmite samples.
• Varying electron flux and dose rates to study dissolution under different radiation conditions.

Main Results:

• Boehmite nanoplatelets show uniform dissolution dependent on electron dose rate.
• Dissolution in aggregated stacks is preferential at accessible ends.
• Higher dose rates induce delamination and interface dissolution in aggregates due to electrostatic repulsion and knock-on damage.

Conclusions:

• Electron beam irradiation significantly affects boehmite dissolution, with dose rate being a critical factor.
• A threshold dose rate exists for electron-beam-enhanced dissolution in boehmite aggregates.
• Understanding these radiation effects is key for applications involving boehmite in irradiated environments.