Probing the microstructure of Nafion-117 using positron annihilation spectroscopy

✍ Scribed by H. S. Sodaye; P. K. Pujari; A. Goswami; S. B. Manohar

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 141 KB
• Volume: 35
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19970415)35:5<771::aid-polb5>3.0.co;2-p

✦ Synopsis

We report a new result on positron annihilation studies in acid-and cationneutralized (Li / , Na / , K / , Rb / , Cs / , UO 2/ 2 , Ni 2/ ) Nafion membranes using positron lifetime and Doppler-broadened annihilation radiation (DBAR) measurements. The free-volume structure is characterized using a simple quantum mechanical model of positronium (Ps) in a spherical well. Our studies indicate that formation and expansion of clusters is always associated with a change in free-volume structure resulting in smaller free-volume holes.