NDLI: The formation of cerium(iii) hydroxide nanoparticles by a radiation mediated increase in local pH

Content Provider	Royal Society of Chemistry (RSC)
Author	Browning, N. D. Lucas, I. T. Abellan, P. Moser, T. H. Grate, J. W. Evans, J. E.
Copyright Year	2017
Abstract	Here we report radiation-induced formation of Ce(III) nanostructures in an in situ liquid cell for the transmission electron microscope (TEM). Small (<5 nm) irregular Ce(OH)3 nanoparticles were identified as the final products from cerium(III) nitrate solutions of initial pH 5.2. Pourbaix diagrams show that solid Ce(OH)3 can only exist above pH 10.4, whereas at lower pH values, Ce(III) should remain soluble as aqueous Ce3+. Reduction of Ce3+ to zerovalent Ce by aqueous electrons followed by hydrolysis is a plausible catalytic mechanism for generating hydroxide. Numerical simulations support that radiolysis of cerium nitrate solutions may lead to pH increases, in contrast to well-known acidification of pure water. Compared to previous radiolytic synthesis routes in aqueous solution for other metal or metal oxide nanoparticles, based on metal ion reduction, for example, the chemical pathways leading to these Ce(III) nanostructures require an increase in the local pH to alkaline conditions where Ce(OH)3 can exist. These results extend the range of chemical conditions that can be induced by radiolysis to form oxidized nanostructures from solution.
Starting Page	3831
Ending Page	3837
Page Count	7
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	7
Issue Number	7
Journal	RSC Advances
DOI	10.1039/c6ra27066b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hydrolysis Transmission electron microscopy Nitrate Cerium Cerium nitrate Radiolysis Ion Valence (chemistry) Hydroxide Pourbaix diagram
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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