Title: Insights into the sonochemical synthesis and properties of salt-free intrinsic plutonium colloids
Authors: DALODIERE ELODIEVIROT MATTHIEUMOROSINI VINCENTCHAVE TONYDUMAS THOMASHENNIG CHRISTOPHEWISS THIERRYDIESTE BLANCO OLIVERSHUH DAVIDTYLISZCAK TOLEKVENAULT LAURENTMOISY PHILIPPENIKITENKO SERGEY
Citation: SCIENTIFIC REPORTS vol. 7 p. 43514
Publisher: NATURE PUBLISHING GROUP
Publication Year: 2017
JRC N°: JRC101754
ISSN: 2045-2322
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC101754
DOI: 10.1038/srep43514
Type: Articles in periodicals and books
Abstract: Fundamental knowledge on intrinsic plutonium colloids is important for the prediction of plutonium behaviour in the geosphere and in engineered systems. The first synthetic route to obtain salt-free intrinsic plutonium colloids by ultrasonic treatment of PuO2 suspensions in pure water is reported. Kinetics showed that both chemical and mechanical effects of ultrasound contribute to the mechanism of Pu colloid formation. In the first stage, fragmentation of initial PuO2 particles provides larger surface contact between cavitation bubbles and solids. Furthermore, hydrogen formed during sonochemical later splitting enables reduction of Pu(IV) to more soluble Pu(III), which then re-oxidizes yielding Pu(IV) colloid. A comparative study of nanostructured PuO2 and Pu colloids produced by sonochemical and hydrolytic methods, has been conducted using HRTEM, Pu LIII-edge XAS, and O K-edge NEXAFS/STXM. Characterization of Pu colloids revealed a correlation between the number of Pu-O and Pu-Pu contacts and the atomic surface-to-volume ratio of the PuO2 nanoparticles. NEXAFS indicated that oxygen state in hydrolytic Pu colloid is influenced by hydrolysed Pu(IV) species to a greater extent than in sonochemical PuO2 nanoparticles. In general, hydrolytic and sonochemical Pu colloids can be described as core-shell nanoparticles composed of quasi-stoichiometric PuO2 cores and hydrolysed Pu(IV) moieties at the surface shell.
JRC Directorate:Nuclear Safety and Security

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.