Positronium annihilation and pore surface chemistry in mesoporous silica films

Chunqing He, Toshitaka Oka, Yoshinori Kobayashi, Nagayasu Oshima, Toshiyuki Ohdaira, Atsushi Kinomura, Ryoichi Suzuki

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Lifetimes of ortho-positronium in mesoporous silica films were measured before and after surface trimethylsilylation of -OH groups. Variations of positronium lifetimes in the mesopores upon the surface modification indicate that the interaction between positronium and the pore surface is weakened in the pores, whose surface is covered with -C H3 groups, in comparison with those covered with -OH groups. This is consistent with the authors' previous observation that positronium slowing down is less efficient in the pores covered with -C H3 groups. The present work demonstrates that in the porosimetric application of positron annihilation lifetime spectroscopy, the interaction between positronium and the pore surface has to be properly taken into consideration.

Original languageEnglish
Article number024102
JournalApplied Physics Letters
Volume91
Issue number2
DOIs
Publication statusPublished - 2007 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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