Paper Title:
Positron Lifetime Spectroscopy on Controlled Pore Glass Porosimetry and Pore Size Distribution
  Abstract

Positron annihilation lifetime spectroscopy (PALS) is used to study a series of controlled pore glasses (CPG). The lifetime spectra were decomposed into four components using the routine LifeTime, version 9.0 (LT9). The largest lifetime τ4, which is attributed to the annihilation of ortho-positronium (o-Ps) localized at mesopores, varied at 300 K between 21 and 131 ns. The size of mesopores (mean free path), D, was determined by N2 adsorption and Hg intrusion techniques to vary between 1.8 and 56 nm. It is shown that the Tao-Eldrup model extended to cylinders of infinite length and diameter d = D describes well the experiment for an overlap parameter δ fitted to be δ = 0.193 nm. The spectra were also analyzed allowing a distribution of o-Ps lifetimes. A method is developed to calculate the pore size distribution n(d) from the τ4 distribution. This method is of particular interest since PALS is very sensitive to pores being too small to be exactly analyzed by conventional porosimetry.

  Info
Periodical
Edited by
S. J. Wang, Z. Q. Chen, B. Wang and Y. C. Jean
Pages
169-172
DOI
10.4028/www.scientific.net/MSF.607.169
Citation
S. Thränert, D. Enke, G. Dlubek, R. Krause-Rehberg, "Positron Lifetime Spectroscopy on Controlled Pore Glass Porosimetry and Pore Size Distribution", Materials Science Forum, Vol. 607, pp. 169-172, 2009
Online since
November 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Dhanadeep Dutta, Bichitra Nandi Ganguly
286
Authors: Fei He, Xiao Dong He, Yao Li
Abstract:Low-density xSiO2-(1-x)Al2O3 xerogels with x=0.9, 0.8, 0.7, 0.6 (mole fractions) were prepared by sol-gel and non-supercritical drying....
2286
Authors: Ji Wang, Zai Liang Hu, Ji Ru Zhang, Ming Zhong Zhang
Abstract:The pore properties of the porous material are important factors influencing the vegetation to grow. The pore properties of an artificial...
461
Authors: Tomáš Matoušek, Petr Ponížil, Marek Galetka
Abstract:Physical properties of polymer foams depend on their macrostructure. In this paper, we study a range of polyuretane foams from the...
145
Authors: Yan Qing Chen, Ren Ping Wu
Chapter 2: Engineering Ceramics and Ceramic Composites
Abstract:A new type of double pore size activated alumina/activated carbon multiphase material was made by using waste aluminum slag and activated...
626