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H-1 nuclear magnetic resonance study of low-temperature water dynamics in a water-soaked perfluorosulfonic acid ionomer Nafion film
- Authors
- Han, Jun Hee; Lee, Kyu Won; Lee, Cheol Eui
- Issue Date
- Jan-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Water-soaked Nafion film; Non-freezing water dynamics; Proton nuclear magnetic resonance spectroscopy
- Citation
- SOLID STATE COMMUNICATIONS, v.250, pp.28 - 30
- Indexed
- SCIE
SCOPUS
- Journal Title
- SOLID STATE COMMUNICATIONS
- Volume
- 250
- Start Page
- 28
- End Page
- 30
- ISSN
- 0038-1098
- 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 T-M = 220 K from the relaxation measurements.
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Collections - College of Science > Department of Physics > 1. Journal Articles
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