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An infrared study of the effects of hydration on cation-loaded nafion thin films

✍ Scribed by Renée M. Blanchard; Ralph G. Nuzzo

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
164 KB
Volume
38
Category
Article
ISSN
0887-6266

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✦ Synopsis

We explore the effects of hydration on the vibrational spectra of cationexchanged Nafion thin films. In addition to the initial H ϩ form of the membrane, the cations selected for study include: Na ϩ , NH 4 ϩ , tetramethylammonium, tetrabutylammonium, hexadecyltrimethylammonium, and tris(2,2Ј-bipyridine)osmium(II). A flow cell is used to follow the changes occurring in a 1000-Å film in response to variations in the humidity of a nitrogen purge gas flowing through the cell. The structural changes occurring due to the binding of water to these cation-exchanged membranes is followed across a broad range of water contents with IR difference spectroscopy. Our results demonstrate a complex role for water in mediating the polyanion-cation interactions. Side-chain reconstructions may play an important role in the ion-binding and transport properties of the ionomer domains.

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