陽電子消滅寿命測定法による多孔質材料中の細孔の大きさや濃度の評価

概要

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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, τ_4 and τ_5)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(τ_5), 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(I_4 and I_5)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.
社団法人日本セラミックス協会の論文
1999-02-01