1H nuclear magnetic resonance study of hydrated water dynamics in perfluorosulfonic acid ionomer Nafion

Jun Hee Han; Kyu Won Lee; G. W. Jeon; Cheol Eui Lee; W. K. Park; E. H. Choi

doi:10.1063/1.4905602

¹H nuclear magnetic resonance study of hydrated water dynamics in perfluorosulfonic acid ionomer Nafion

Jun Hee Han, Kyu Won Lee, G. W. Jeon, Cheol Eui Lee, W. K. Park, E. H. Choi

Department of Physics

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

14 Citations (Scopus)

Abstract

We have studied the dynamics of hydrated water molecules in the proton exchange membrane of Nafion by means of high-resolution ¹H nuclear magnetic resonance (NMR) measurements. "Bound" and "free" states of hydrated water clusters as well as the exchange protons were identified from the NMR chemical shift measurements, and their activation energies were obtained from the temperature-dependent laboratory- and rotating-frame spin-lattice relaxation measurements. Besides, a peculiar motional transition in the ultralow frequency region was observed at 373 K for the "free" hydrated water from the rotating-frame NMR spin-lattice relaxation time measurements.

Original language	English
Article number	023104
Journal	Applied Physics Letters
Volume	106
Issue number	2
DOIs	https://doi.org/10.1063/1.4905602
Publication status	Published - 2015 Jan 12

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "1H nuclear magnetic resonance study of hydrated water dynamics in perfluorosulfonic acid ionomer Nafion",

abstract = "We have studied the dynamics of hydrated water molecules in the proton exchange membrane of Nafion by means of high-resolution 1H nuclear magnetic resonance (NMR) measurements. {"}Bound{"} and {"}free{"} states of hydrated water clusters as well as the exchange protons were identified from the NMR chemical shift measurements, and their activation energies were obtained from the temperature-dependent laboratory- and rotating-frame spin-lattice relaxation measurements. Besides, a peculiar motional transition in the ultralow frequency region was observed at 373 K for the {"}free{"} hydrated water from the rotating-frame NMR spin-lattice relaxation time measurements.",

author = "Han, {Jun Hee} and Lee, {Kyu Won} and Jeon, {G. W.} and Lee, {Cheol Eui} and Park, {W. K.} and Choi, {E. H.}",

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AU - Han, Jun Hee

AU - Lee, Kyu Won

AU - Jeon, G. W.

AU - Lee, Cheol Eui

AU - Park, W. K.

AU - Choi, E. H.

PY - 2015/1/12

Y1 - 2015/1/12

N2 - We have studied the dynamics of hydrated water molecules in the proton exchange membrane of Nafion by means of high-resolution 1H nuclear magnetic resonance (NMR) measurements. "Bound" and "free" states of hydrated water clusters as well as the exchange protons were identified from the NMR chemical shift measurements, and their activation energies were obtained from the temperature-dependent laboratory- and rotating-frame spin-lattice relaxation measurements. Besides, a peculiar motional transition in the ultralow frequency region was observed at 373 K for the "free" hydrated water from the rotating-frame NMR spin-lattice relaxation time measurements.

AB - We have studied the dynamics of hydrated water molecules in the proton exchange membrane of Nafion by means of high-resolution 1H nuclear magnetic resonance (NMR) measurements. "Bound" and "free" states of hydrated water clusters as well as the exchange protons were identified from the NMR chemical shift measurements, and their activation energies were obtained from the temperature-dependent laboratory- and rotating-frame spin-lattice relaxation measurements. Besides, a peculiar motional transition in the ultralow frequency region was observed at 373 K for the "free" hydrated water from the rotating-frame NMR spin-lattice relaxation time measurements.

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JF - Applied Physics Letters

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ER -

¹H nuclear magnetic resonance study of hydrated water dynamics in perfluorosulfonic acid ionomer Nafion

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