NMR studies on supercritical fluids in nanoporous materials

Yusuke Hiejima, Mitsuhiro Kanakubo, Kimitaka Minami, Takafumi Aizawa, Hiroshi Nanjo, Yutaka Ikushima

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    129Xe NMR spectroscopy is applied to investigate the physical properties of Xe confined in porous glasses up to the supercritical region. The chemical shift of confined Xe is larger than that of bulk Xe, which is approximately proportional to density, and the upward deviation is more enhanced for smaller pore. The deviation is large in the gas phase, and has a maximum far below the critical density, while it gradually decreases and approaches zero in the liquid phase. Below the critical density the both of the size and surface effects are observed, while the surface effect becomes minor and the size effect persists above the critical density. The chemical shift at the dilute limit depends on the surface properties of the matrix, as well as the pore size.

    Original languageEnglish
    Pages (from-to)338-340
    Number of pages3
    Journale-Journal of Surface Science and Nanotechnology
    Volume3
    DOIs
    Publication statusPublished - 2005 Nov 27

    Keywords

    • Chemical shift
    • Confined fluid
    • Nuclear magnetic resonance
    • Physical adsorption
    • Porous solids
    • Silicon oxides
    • Solid-gas interfaces
    • Supercritical fluid

    ASJC Scopus subject areas

    • Biotechnology
    • Bioengineering
    • Condensed Matter Physics
    • Mechanics of Materials
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films

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  • Cite this

    Hiejima, Y., Kanakubo, M., Minami, K., Aizawa, T., Nanjo, H., & Ikushima, Y. (2005). NMR studies on supercritical fluids in nanoporous materials. e-Journal of Surface Science and Nanotechnology, 3, 338-340. https://doi.org/10.1380/ejssnt.2005.338