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Selected Works of Tabbetha A. Dobbins
Presentation
Effects of Nano-confinement in Mesoporous Silica on Hydrogen Dynamics in TiCl 3 -Doped NaAlH 4 Studied using Quasi-Elastic Neutron Scattering
MAR18 Meeting of the American Physical Society (2018)
  • Tabbetha A. Dobbins, Rowan University
  • Craig Brown, National Institute of Standards and Technology
  • Madhusan Tyagi
  • Timothy Jenkins, National Institute of Standards and Technology
Link
Abstract
The dynamics of hydrogen in 4 mol % TiCl3-doped NaAlH4 which was then confined within the mesoporous SBA15 was studied using quasi-elastic neutron scattering (QENS) technique. Results show that a higher fraction of hydrogen is mobile within the nanoconfined systems relative to bulk TiCl3-doped NaAlH4. However, the overall motion of hydrogen was localized and the nanostructured Ti-doped NaAlH4 exhibited mobility than the bulk (not nanostructured) materials of the same composition. Data were collected on the Disc Chopper Spectrometer and the High Flux Backscattering Spectrometer. Approximately 70% of hydrogen atoms are mobile at 400K while participating in short-range dynamics which could be described by the rotation of a AlH4 tetrahedra. However, less than 10% hydrogen was mobile at higher temperatures of 420K and 450K, possibly because the higher temperatures lead the formation of hydride phases.
Disciplines
Publication Date
March 8, 2018
Location
Los Angeles, California
Citation Information
Tabbetha A. Dobbins, Craig Brown, Madhusan Tyagi and Timothy Jenkins. "Effects of Nano-confinement in Mesoporous Silica on Hydrogen Dynamics in TiCl 3 -Doped NaAlH 4 Studied using Quasi-Elastic Neutron Scattering" MAR18 Meeting of the American Physical Society (2018)
Available at: http://works.bepress.com/tabbetha-dobbins/8/