In Situ Liquid Cell Transmission Electron Microscopy Study of Studtite Particle Formation and Growth via Electron Beam Radiolysis

被引：1

作者：

Kurtyka, Nick ^{[1
]}

van Devener, Brian ^{[2
]}

Chung, Brandon W. ^{[3
]}

Mcdonald, Luther W. ^{[1
]}

机构：

[1] Univ Utah, Dept Nucl Engn, Salt Lake City, UT 84112 USA

[2] Univ Utah, Electron Microscopy & Surface Anal Lab, Salt Lake City, UT 84112 USA

[3] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

来源：

ACS OMEGA | 2023年 / 8卷 / 50期

关键词：

QUANTIFYING MORPHOLOGICAL FEATURES; RADIATION-DAMAGE; NUCLEATION; TEM; NANOPARTICLES; CORROSION;

D O I：

10.1021/acsomega.3c07743

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This study presents in situ observations of studtite (UO2O2(H2O)(2)<middle dot>2H(2)O) crystal growth utilizing liquid phase transmission electron microscopy (LP-TEM). Studtite was precipitated from a uranyl nitrate hexahydrate solution using hydrogen peroxide formed by the radiolysis of water in the TEM electron beam. The hydrogen peroxide (H2O2) concentration, directly controlled by the electron beam current, was varied to create local environments of low and high concentrations to compare the impact of the supersaturation ratio on the nucleation and growth mechanisms of studtite particles. The subsequent growth mechanisms were observed in real time by TEM and scanning TEM imaging. After the initial precipitation reaction, a post-mortem TEM analysis was performed on the samples to obtain high-resolution TEM images and selected area electron diffraction patterns to investigate crystallinity as well as energy-dispersive X-ray spectroscopy spectra to ensure that studtite was produced. The results reveal that studtite particles form through various mechanisms based on the concentration ratio of uranyl to H2O2 and that studtite is initially produced through an amorphous intermediary prior to formation of the crystalline material commonly reported in the literature.

引用

页码：48336 / 48343

页数：8

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