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Microheterogeneity in Native and Cation-Exchanged Nafion Membranes

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Title Microheterogeneity in Native and Cation-Exchanged Nafion Membranes
 
Creator IYER, ESS
DATTA, A
 
Subject FUEL-CELL MEMBRANES
PROTON-TRANSFER
REVERSE MICELLES
AQUEOUS-SOLUTION
WATER DYNAMICS
STATE
2-(2'-PYRIDYL)BENZIMIDAZOLE
SPECTROSCOPY
TRANSPORT
IONOMERS
 
Description 2-(4'-Pyridyl)benzimidazole (4PBI) has been used to investigate the microheterogeneity of water nanochannels of Nafion membranes at two different hydration levels. Native as well as cation exchanged Nafion membranes are found to protonate one of the two monoprotonated forms of 4PBI selectively. In native membranes and in those in which H3O+ ions are replaced by (CH3)(4)N+ ions, the pyridyl nitrogen is protonated preferentially. In Na+-exchanged membranes, however, the benzimidazole nitrogen is protonated selectively. Unlike other fluorescent probes used in earlier studies, 4PBI can differentiate between the two different cation-exchanged membranes at lower as well as higher hydration levels.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-10-16T12:52:38Z
2014-10-16T12:52:38Z
2012
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY B, 116(33)9992-9998
http://dx.doi.org/10.1021/jp303924a
http://dspace.library.iitb.ac.in/jspui/handle/100/15595
 
Language en