Conference Proceedings Paper
Radiation-Induced Nanoparticle Formation under Steady-State Radiolysis: Comparison of the Fe, Co and Cr Systems
34th Annual CNS Conference - 2013 June 09-12
Jiju M. Joseph (Western University)
Leena M. Alrehaily (Western University)
Pam A. Yakabuskie (Western University)
David A. Guzonas (AECL)
Jungsook Clara Wren (Western University)
This work involves a comparative study of g-radiation-induced nanoparticle formation under steady-state irradiation of the Fe, Cr, and Co systems. Water containing initially dissolved metal ions was irradiated in a 60Co g-cell. The resulting nanoparticles were characterized using FTIR spectroscopy, Raman spectroscopy and XPS. Transmission electron microscopy (TEM) was used to identify the size and shape of the particles. The mechanisms for the formation of g-FeOOH, Cr2O3 and Co3O4 nanoparticles are discussed. Depending on the redox potential of the metallic species, either oxidizing or reducing water radiolysis products are responsible for the generation of particle nucleation sites and particle growth. Other key factors that control nanoparticle formation are the pH of the solution and the initial oxygenation of the solution.
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