Positronium chemistry in porous materials

Y. Kobayashi, K. Ito, T. Oka, K. Hirata

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


Porous materials have fascinated positron and positronium chemists for over decades. In the early 1970s it was already known that ortho-positronium (o-Ps) exhibits characteristic long lifetimes in silica gels, porous glass and zeolites. Since then, our understanding of Ps formation, diffusion and annihilation has been drastically deepened. Ps is now well recognized as a powerful porosimetric and chemical probe to study the average pore size, pore size distribution, pore connectivity and surface properties of various porous materials including thin films. In this paper, developments of Ps chemistry in porous materials undertaken in the past some 40 yr are surveyed and problems to be addressed in future are briefly discussed.

Original languageEnglish
Pages (from-to)224-230
Number of pages7
JournalRadiation Physics and Chemistry
Issue number2
Publication statusPublished - 2007 Feb
Externally publishedYes


  • Adsorption
  • Catalysis
  • Porosimetry
  • Porous materials
  • Positron annihilation
  • Positronium

ASJC Scopus subject areas

  • Radiation


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