Estimation of pore size of porous materials by positron annihilation lifetime measurement

Kenji Ito, Yasuhiro Yagi, Shingo Hirano, Masaru Miyayama, Tetsuichi Kudo, Akira Kishimoto, Yusuke Ujihira

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Pore size of several porous materials such as zeolites (MCM-41 and MCM-48) and highly fined grain aggregates of zirconia was estimated by means of positron annihilation lifetime measurement. Observed lifetimes of ortho-positronium (over ∼20 ns, τ4 and τ5) correspond to the meso-pore sizes assessed by conventional porosimetries due to a nitrogen physisorption and a mercury porosimetry. The long-lived lifetime components included an unassigned lifetime component (τ5), which was not detected by the other porosimetry. The observed ortho-positronium lifetimes are correlated to the mean size of pores. A relation between relative intensities of the long-lived ortho-positronium components (I4 and I5) and specific surface areas is discussed and a variation of a numerical concentration of pores is correlated to the change of the particle sizes of the zirconia aggregates.

Original languageEnglish
Pages (from-to)123-127
Number of pages5
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume107
Issue number2
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

Positron annihilation
Multicarrier modulation
porous materials
positron annihilation
Zirconia
Pore size
Porous materials
porosity
Zeolites
positronium
life (durability)
Physisorption
Mercury
Specific surface area
Nitrogen
zirconium oxides
Particle size
zeolites
zirconium oxide
nitrogen

Keywords

  • Meso pore
  • Micro pore
  • Nondestructive analysis
  • Pore size
  • Porous material
  • Positron annihilation
  • Positronium

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Estimation of pore size of porous materials by positron annihilation lifetime measurement. / Ito, Kenji; Yagi, Yasuhiro; Hirano, Shingo; Miyayama, Masaru; Kudo, Tetsuichi; Kishimoto, Akira; Ujihira, Yusuke.

In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 107, No. 2, 1999, p. 123-127.

Research output: Contribution to journalArticle

Ito, Kenji ; Yagi, Yasuhiro ; Hirano, Shingo ; Miyayama, Masaru ; Kudo, Tetsuichi ; Kishimoto, Akira ; Ujihira, Yusuke. / Estimation of pore size of porous materials by positron annihilation lifetime measurement. In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan. 1999 ; Vol. 107, No. 2. pp. 123-127.
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AU - Kudo, Tetsuichi

AU - Kishimoto, Akira

AU - Ujihira, Yusuke

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