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Color in Coordination Complexes
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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
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Solid-state dynamics of uranyl polyoxometalates.

Todd M Alam1, Zuolei Liao, Lev N Zakharov

  • 1Department of Electronic, Optical and Nanostructured Materials, Sandia National Laboratories, Albuquerque, NM 87185 (USA). tmalam@sandia.gov.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 4, 2014
PubMed
Summary
This summary is machine-generated.

Solid-state uranyl polyoxometalate (POM) capsules exhibit rapid Li(+) and water transport. This discovery reveals new dynamics in actinide materials and separation processes crucial for the nuclear fuel cycle.

Keywords:
ion-exchangepolyoxometalateproton MAS NMRsolid-state NMRuranyl

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nuclear Chemistry

Background:

  • Uranyl polyoxometalates (POMs) are key to actinide materials and nuclear fuel cycle separations.
  • Solid-state structures of uranyl POMs are known, but their solution chemistry and dynamics are less understood.
  • Encapsulated species exchange in solution for POMs is documented, but not in the solid state.

Purpose of the Study:

  • To investigate the solid-state exchange dynamics of encapsulated species in uranyl POMs.
  • To provide unprecedented detail on transport mechanisms within uranyl POMs.
  • To explore the potential of f-block element materials and vesicle-like POMs.

Main Methods:

  • Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) spectroscopy was employed.
  • Investigated the transport of Li(+) and aqua species across uranyl shells.
  • Analyzed the influence of temperature and pore blocking on transport rates.

Main Results:

  • Observed extremely high rates of Li(+) and aqua species transport across the uranyl shell in the solid state.
  • Demonstrated that solid-state exchange dynamics are temperature-dependent.
  • Showed that larger encapsulated species can block pores, hindering transport.

Conclusions:

  • Solid-state uranyl POMs exhibit dynamic behavior previously unobserved.
  • These findings open new avenues for actinide material development and separation technologies.
  • Vesicle-like POMs and f-block element materials show significant untapped potential.