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Raman study of water in Nafion-117 membranes

Authors
Journal
Solid State Ionics
0167-2738
Publisher
Elsevier
Publication Date
Volume
85
Identifiers
DOI: 10.1016/0167-2738(96)00084-7
Keywords
  • Ix. Proton Conductors

Abstract

Abstract We report on a Raman scattering study of the state of water in the acid form of the perfluorosulfonate exchanger membrane Nafion-117 in H 2O- and D 2O-wet conditions. The data reveal that in Nafion-117 (molecular weight 1100), as distinct from Nafion with higher molecular weights (1200 and 1400), practically all water molecules participate in OH · · · H bonding rather than linking to the fluorocarbon matrix. Moreover, the shifts of the OH and OD bands in Nafion-1100 towards higher frequencies as compared to Nafion of larger equivalent weights (1200 and 1400) implies that the state of water in Nafion-117 is more bulk-like than in the higher molecular weight membranes.

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