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Published on: September 16, 2016
Long-term aging of a CeO(2) based nanocomposite used for wood protection
Melanie Auffan1, Armand Masion1, Jerome Labille1
1CNRS, Aix-Marseille Université, CEREGE UM34, UMR 7330, 13545 Aix en Provence, France; International Consortium for the Environmental Implications of Nanotechnology iCEINT, Aix en Provence, France.
Abstract:
A multi-scale methodology was used to characterize the long-term behavior and chemical stability of a CeO2-based nanocomposite used as UV filter in wood stains. ATR-FTIR and (13)C NMR demonstrated that the citrate coated chelates with Ce(IV) through its central carboxyl- and its α-hydroxyl- groups at the surface of the unaged nanocomposite. After 42 days under artificial daylight, the citrate completely disappeared and small amount of degradation products remained attached to the surface even after 112 days. Moreover, the release/desorption of the citrate layer led to a surface reorganization of the nano-sized CeO2 core observed by XANES (Ce L3-edge). Such a surface and structural transformation of the commercialized nanocomposite could have implications in term of fate, transport, and potential impacts towards the environment.
