High Pressure NMR and Electrical Conductivity Studies of Acid Form NAFION Membranes.
Abstract
The effect of high pressure on the electrical conductivity and proton, deuteron and (17)O NMR in acid form NAFION-117 conditioned at various levels of relative humidity has been determined. NMR measurements of T1 were carried out as a function of pressure up to 0.25 GPa. The complex impedance studies were made along the plane of the film at frequencies from 10 to 10(exp 8) Hz at room temperature and pressures up to 0.3 GPa. The electrical conductivity and proton and deuteron NMR measurements show that the activation volume for materials containing greater than about 3 water molecules per sulfonate is 2 to 3/cu cm/mol and larger values are found as the amount of water decreases. The implications of these results are discussed. The 170 NMR results are unexplained at the present time. NAFION, High Pressure NMR, High Pressure Conductivity
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 29, 1994
- Accession Number
- ADA280195
Entities
People
- J. J. Fontanella
- M. C. Wintersgill
- P. E. Stallworth
- R. S. Chen
- S. Greenbaum
Organizations
- Hunter College