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

Corresponding address

Optica Applicata
Wrocław University of Science and Technology
Faculty of Fundamental Problems of Technology
Wybrzeże Wyspiańskiego 27
50-370 Wrocław, Poland

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Wrocław University of Science and Technology
Faculty of Fundamental Problems of Technology
Wybrzeże Wyspiańskiego 27
50-370 Wrocław, Poland

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