Small-angle scattering model analysis of cage-like uranyl peroxide nanoparticles

Jianqiao Zhang, Qiang Tian, Qintang Li, Mark Julian Henderson, Xianguo Tuo, Minhao Yan, László Almásy

Research output: Contribution to journalArticle

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.

Original languageEnglish
Article number111794
JournalJournal of Molecular Liquids
Volume296
DOIs
Publication statusPublished - Dec 15 2019

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Keywords

  • Guinier law
  • Nanoparticle
  • Small-angle scattering
  • Spherical shell model
  • Uranyl peroxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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