Design and Synthesis of Oriented Guest-Host Nanostructures for Enhanced Membrane Performances Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.

Title

  • Main Title Design and Synthesis of Oriented Guest-Host Nanostructures for Enhanced Membrane Performances

Creator

  • Author: Hu, M.Z.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization

Publisher

  • Name: Oak Ridge National Laboratory
    Place of Publication: [Tennessee]
    Additional Info: ORNL

Date

  • Creation: 2005-11-15

Language

  • English

Description

  • Content Description: This project has demonstrated a novel nanomaterial design concept and a synthesis method for ''guesthost'' type superionic-conducting nanocomposite membranes. This concept consists of nanophases of oxide electrolyte nanograins (guest) encapsulated inside the nanopore channels of an oxide layer matrix (host), with channels oriented perpendicular to the layer surface. Using ionic conducting YSZ (yttrium stabilized zirconia) as a special case, we have shown that the host-guest design allows orientation of a large number channels, allowing a high density of nanograin boundaries/interfaces to be built into the film to enhance cross-membrane conductivity. This structure allowed conductivity measurements with impedance spectroscopy to be performed for the first time at room temperature. Cross-membrane conductivity values at low temperature ranges of interest are the higher than any reported values. The conductivity-enhancing mechanisms could be attributed to (1) controlled orientation and increased number density of YSZ nanograin-host interfaces and (2) creation and stabilization of YSZ nanocrystalline phases inside nanopore channels (<10 nm dia.). This successful initial demonstration of host-guest nanostructures is expected to have direct impact on fuel cell technologies, and may also have beneficial use in a broad range of applications such as in solar cells, sensors, chemical/gas separations, catalysis, and magnetic memory devices. This work may also lead to a new way to develop membrane technologies that offer orders-of-magnitude higher permeability and selectivity, as well as improved thermal stability of the desirable nanocrystalline phases.

Subject

  • STI Subject Categories: 30 Direct Energy Conversion
  • Keyword: Orientation
  • STI Subject Categories: 14 Solar Energy
  • Keyword: Membranes
  • Keyword: Stability
  • Keyword: Solar Cells
  • STI Subject Categories: 36 Materials Science
  • Keyword: Stabilization
  • Keyword: Yttrium
  • Keyword: Electrolytes
  • Keyword: Oxides
  • Keyword: Nanostructures
  • Keyword: Spectroscopy
  • Keyword: Fuel Cells
  • Keyword: Catalysis
  • Keyword: Impedance
  • Keyword: Memory Devices
  • Keyword: Synthesis
  • Keyword: Permeability

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Report No.: R05-124383
  • Grant Number: DE-AC05-00OR22725
  • DOI: 10.2172/885953
  • Office of Scientific & Technical Information Report Number: 885953
  • Archival Resource Key: ark:/67531/metadc892710