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

doi:10.1016/j.ssc.2016.11.005

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

4 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 T_M=220 K from the relaxation measurements.

Original language	English
Pages (from-to)	28-30
Number of pages	3
Journal	Solid State Communications
Volume	250
DOIs	https://doi.org/10.1016/j.ssc.2016.11.005
Publication status	Published - 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

Access to Document

10.1016/j.ssc.2016.11.005

Cite this

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

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.",

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AB - 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.

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