Annihilation Process of Positron in Degraded Nafion®-117

Yoshihide Honda; Yoshikazu Aoyagi; Sachiko Tojo; Yoko Akiyama; Shigehiro Nishijima

doi:10.4028/www.scientific.net/MSF.733.53

Paper Titles

The Free Volume Dynamics
p.33

Study of Unbound HePs Using Exact Diagonalization Technique
p.38

Layer Structures of Composite Membranes for Water Filtration Elucidated by Variable-Energy Positron Annihilation
p.45

Effect of Water on the Size Distribution of Free-Volume Holes in Nafion Membrane
p.49

Annihilation Process of Positron in Degraded Nafion^®-117
p.53

Study of Thin Nafion^® Films for Fuel Cells Using Energy Variable Slow Positron Annihilation Spectroscopy
p.57

Positronium Lifetimes and Gas Permeation in Aquivion® for Fuel Cells
p.61

Positronium in Normal Alkanes
p.67

The Influence of Admixtures in n-Alkanes on Electron Traps
p.75

HomeMaterials Science ForumMaterials Science Forum Vol. 733Annihilation Process of Positron in Degraded...

Annihilation Process of Positron in Degraded Nafion^®-117

Abstract:

Annihilation process of positron in Nafion-117 was investigated under several kinds of conditions to elucidate degradation process of polymer electrolyte membrane. It was found that ortho-positronium stayed beside cluster wall and side chains and its lifetime reflected cluster size. Annihilation process of positron was found to be greatly influenced by the electronic state of sulfonic group. These results showed that positron annihilation spectroscopy would be good tool to detect degradation of polymer electrolyte membrane.