1H nuclear magnetic resonance study of low-temperature water dynamics in a water-soaked perfluorosulfonic acid ionomer Nafion film

Jun Hee Han, Kyu Won Lee, Cheol Eui Lee

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    We have employed proton nuclear magnetic resonance (NMR) spectroscopy in order to study the low-temperature water dynamics in a water-soaked perfluorosulfonic acid ionomer Nafion (NR-211) film. According to the recent models, Nafion may comprise water strongly bound to the sulfonic acid group, hydration water, and condensed water species. In this work, three separate NMR peaks from the water species revealing distinct behaviors were identified. A significant portion of the ”bound” water remained unfrozen down to 200 K, whereas a slow-to-fast motional limit transition was observed at TM=220 K from the relaxation measurements.

    Original languageEnglish
    Pages (from-to)28-30
    Number of pages3
    JournalSolid State Communications
    Volume250
    DOIs
    Publication statusPublished - 2017 Jan 1

    Bibliographical note

    Funding Information:
    This work was supported by the National Research Foundation of Korea (Project Nos. 2016R1D1A1A09917003 and NRF-2010-0027963). Measurements at the Korea Basic Science Institute (KBSI) are acknowledged. J.H.H. acknowledges financial support from KBSI grant ( D36611 ) funded by the Korea Basic Science Institute (KBSI) .

    Publisher Copyright:
    © 2016 Elsevier Ltd

    Keywords

    • A. Water-soaked Nafion film
    • D. Non-freezing water dynamics
    • E. Proton nuclear magnetic resonance spectroscopy

    ASJC Scopus subject areas

    • General Chemistry
    • Condensed Matter Physics
    • Materials Chemistry

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