Abstract
Uranyl peroxide nanoparticles (NPs) with spherical cage structure form in aqueous medium by the assembly of uranyl hexagonal bipyramids. Morphological evolution of uranyl peroxide NPs prepared with different LiOH/UO2 molar ratios is studied by small-angle X-ray scattering. Guinier analysis indicated that the overall size of the uranyl peroxide NPs increased with storage time. Their structure is further analyzed by model fitting to a spherical shell particle. Analysis of the particle size shows that U24 particles containing 24 uranium atoms are formed in dispersion with Li/U = 7.7, and U28 particles are generated in dispersion with Li/U = 3.1. With increasing storage time, the interactions between uranyl peroxide NPs changes from repulsion to attraction for samples with Li/U ratio 5.5 and 7.7, leading to their agglomeration and precipitation. Certain amount of large aggregates remained in the dispersions in ambient condition for over one year, as confirmed by dynamic light scattering. This study gives insight into the structural evolution and interactions of uranyl peroxide NPs.
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