The Industrial Applications of Positron Annihilation Spectroscopy in Performance Polymers

Positron annihilation lifetime and gas permeation studies of energetic ion-irradiated polycarbonate membranes

“…The o-Ps lifetime, t 3 of pristine samples is found to be in agreement with the reported values (Yang and Jean, 1997). The o-Ps lifetime, t 3 ; increases for fluence 5 Â 10 6 and 4 Â 10 8 ions cm À2 and then decreases for 1 Â 10 12 ions cm À2 .…”

Probing capped and uncapped mesoporous low-dielectric constant films using positron annihilation lifetime spectroscopy

“…2 The lifetime of localized orthopositronium (o-Ps; Ps is an e ϩ -e Ϫ bound state͒ has been experimentally and theoretically established as a measure of void size for pore diameters Ͻ1 nm, 3,4 and for deriving poresize distributions. 2 The lifetime of localized orthopositronium (o-Ps; Ps is an e ϩ -e Ϫ bound state͒ has been experimentally and theoretically established as a measure of void size for pore diameters Ͻ1 nm, 3,4 and for deriving poresize distributions.…”

Porosity characterization of aerogels using positron annihilation lifetime spectroscopy

“…By utilizing this broad range, PALS has emerged as a powerful tool for measuring the pore size in various materials [10][11][12][13][14]. Within the scope of free-volume theories, the o-Ps particle is bound inside a pore region.…”