Radiolytic Events in Nanostructured Aluminum Hydroxides

Josiane A Kaddissy (1) , Stephane A Esnouf (2) , Delphine A Durand (2) , Dimitri A Saffre (3) , Eddy A Foy (4, 5) , Jean-Philippe Renault (1)

1 LIONS - Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire
2 SECR - Service d'Etudes du Comportement des Radionucléides
3 AREVA TNI
4 LAPA - UMR 3685 - Laboratoire Archéomatériaux et Prévision de l'Altération
5 IRAMAT - LMC - IRAMAT - Laboratoire Métallurgies et Cultures

The radiolysis of nanosized Al(OH) 3 and AlOOH has been examined. Irradiations were performed using electron beams. H 2 radiolytic yields were determined with respect to structure and particle size. The measured yields have an order of magnitude of 10 −9 mol J −1 , which decreases when particle size is lowered. Surface and structure analysis techniques were used to detect any change before and after irradiation, and no differences were seen. Annealing experiments showed that a significant amount of molecular hydrogen was trapped inside AlOOH and Al(OH) 3. H radicals, F centers, O − and O 3 − centers were identified by electron paramagnetic resonance (EPR) spectroscopy. A significant part of the absorbed energy remains stored into the nanomaterials and induces a secondary H 2 production upon heating.

Domains: Material chemistry

Josiane A Kaddissy, Stephane A Esnouf, Delphine A Durand, Dimitri A Saffre, Eddy A Foy, et al.. Radiolytic Events in Nanostructured Aluminum Hydroxides. Journal of Physical Chemistry C, 2017, 121 (11), pp.6365 - 6373. ⟨10.1021/acs.jpcc.6b13104⟩. ⟨cea-01520778⟩