Vol. 33, Issue 1, pp. 7-12

  1. Archive
  2. Optica Applicata Vol. 33, Issue 1, pp. 7-12 (2003)
Vol. 33 Issue 1 pp. 7-12

Pore size determination by positron annihilation lifetime spectroscopy

Bozena Jasinska, Andrzej L. Dawidowicz, Tomasz Goworek, Jan Wawryszczuk

Keywords

positron annihilation, positronium, porous glass, porosimetry

Abstract

Two Vycor glasses were investigated using PALS method. The model of pick-off annihilation in cylindrical free volume was applied to evaluate the pore radii. The o-Ps mean lifetime value in the pores changed from 6.5 to 40 ns in one glass, while from 13 to 51 ns in the other (softer) one. The determined pore radii, using a cylindrical shape model, were from 0.5 to 1.4 nm and from 0.7 to 1.6 nm, respectively.

Vol. 33
Issue 1
pp. 7-12

0.45 MB
OPTICA APPLICATA - a quarterly of the Wrocław University of Science and Technology, Faculty of Fundamental Problems of Technology