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Title: {sup 1}H nuclear magnetic resonance study of hydrated water dynamics in perfluorosulfonic acid ionomer Nafion

We have studied the dynamics of hydrated water molecules in the proton exchange membrane of Nafion by means of high-resolution {sup 1}H 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.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Department of Physics, Korea University, Seoul 136-713 (Korea, Republic of)
  2. Global Education Center for Engineers, Seoul National University, Seoul 151-744 (Korea, Republic of)
  3. Department of Electophysics, Kwangwoon University, Seoul 130-701 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22399124
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; CHEMICAL SHIFT; HYDROGEN 1; MEMBRANES; MOLECULES; NUCLEAR MAGNETIC RESONANCE; PROTONS; RESOLUTION; SPIN-LATTICE RELAXATION; TEMPERATURE DEPENDENCE; TIME MEASUREMENT; WATER