Applied physics

, Volume 6, Issue 3, pp 323–326 | Cite as

Structure of porous vycor glass and its adsorption characteristics of water —An application of positron annihilation method

  • Yasuo Ito
  • Toshiro Yamashina
  • Michio Nagasaka
Contributed Papers


Positron lifetimes in porous Vycor glass have been measured. There are four lifetime components, and the fourth component has been assigned too-Ps annihilation in large pores of radius 34 Å. The intensityI 4 has been correlated to a specific surface area, but the value obtained fromI 4 by the Monte Carlo method is smaller than that obtained by the BET method. From variations in (τ4,I 4) against the kinetics of adsorption of water vapor, a rough picture of water adsorption is presented.

Index Headings

Positron lifetime measurement Porous glass 


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Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • Yasuo Ito
    • 1
  • Toshiro Yamashina
    • 2
  • Michio Nagasaka
    • 2
  1. 1.Research Center for Nuclear Science and TechnologyUniversity of TokyoTokyoJapan
  2. 2.Department of Nuclear Engineering, Faculty of EngineeringHokkaido UniversitySapporoJapan

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