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

Research output: Contribution to journalArticle

11 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 languageEnglish
Article number023104
JournalApplied Physics Letters
Volume106
Issue number2
DOIs
Publication statusPublished - 2015 Jan 12

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spin-lattice relaxation
nuclear magnetic resonance
acids
water
extremely low frequencies
protons
chemical equilibrium
relaxation time
time measurement
activation energy
membranes
high resolution
molecules
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

1H nuclear magnetic resonance study of hydrated water dynamics in perfluorosulfonic acid ionomer Nafion. / Han, Jun Hee; Lee, Kyu Won; Jeon, G. W.; Lee, Cheol Eui; Park, W. K.; Choi, E. H.

In: Applied Physics Letters, Vol. 106, No. 2, 023104, 12.01.2015.

Research output: Contribution to journalArticle

Han, Jun Hee ; Lee, Kyu Won ; Jeon, G. W. ; Lee, Cheol Eui ; Park, W. K. ; Choi, E. H. / 1H nuclear magnetic resonance study of hydrated water dynamics in perfluorosulfonic acid ionomer Nafion. In: Applied Physics Letters. 2015 ; Vol. 106, No. 2.
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