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The formation of ionic charge carriers and their transport in methyl sulfonic acid (CH 3 SO 3 H)–water mixtures (MSA–H 2 O) have been investigated by 1 H NMR and impedance spectroscopy. The dissociation constant is close to K=1.8 at high water contents, and the maximum molar concentration of ions (H 3 O + and CH 3 SO 3− ) is found...
Proton and sodium-23 spectra are reported on acid and sodium neutralized forms of the perfluorosulfonate ionomer (Nafion), respectively. This local structural view is compared with pulse field gradient diffusion measurements of water, methanol and dimethyl methylphosphonate (DMMP) in several Nafion films. Both the proton and sodium-23 spectra indicate that the counter ions are primarily in clusters...
Self-diffusion constants for water, ethanol and decafluoropentane were measured in the perfluorosulfonate ionomer NafionR using pulse field gradient proton NMR. Measurements were made as a function of concentration, temperature and diffusion time. For water, diffusion constants ranged from 10−4 to 10−7cm2/s. A reasonable interpretation could be developed using free volume theory if the concentration...
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