Electron microscopy of biogenic minerals: structure and sizes of uranium dioxide nanoparticles with Mn2+ impurities
https://doi.org/10.17586/2220-8054-2019-10-2-215-226
Abstract
Methodological aspects of the extraction of structural and chemical information from transmission electron microscopy (TEM) of uranium dioxide (UO2) biogenic nanoparticles are presented. Nanoparticles were formed via the bacterial reduction of water-soluble uranyl acetate with U (VI) in the presence of Mn2+ ions and cultures Shewanella oneidensis MR-1 in the medium. The particles of 1.2 – 3.5 nm in diameter and particle agglomerations were visualized in conventional TEM, high resolution TEM, scanning TEM modes. Their phase and chemical composition were investigated with electron diffraction, X-ray energy dispersive spectrometry and electron energy loss spectroscopy with high spatial resolution. Maintenance of the element balance helped to find the composition of the mixture of UO2 and Mn acetates. The interpretation of TEM data and modeling allowed to propose the mechanism for the suppression of UO2 particle growth and higher resistance to dissolution of smaller UO2 particles with adsorbed Mn acetate compared to the larger pure particles.
Keywords
uranium dioxide nanoparticles,
bacterial reduction,
manganese impurity,
transmission electron microscopy
Supporting agencies: All samples were prepared at Ecole Polytechnique F ´ ed ´ erale de Lausanne (EPFL). The help of Prof. Philippe ´ Buffat in discussions of results is acknowledged. This work was also supported by the Ministry of Science and Higher Education of the Russian Federation.
About the Author
E. I. Suvorova
A. V. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky pr., 59, 19333 Moscow
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Review
For citations:
Suvorova E.I. Electron microscopy of biogenic minerals: structure and sizes of uranium dioxide nanoparticles with Mn2+ impurities. Nanosystems: Physics, Chemistry, Mathematics. 2019;10(2):215-226. https://doi.org/10.17586/2220-8054-2019-10-2-215-226
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