Free-volume changes at nanoscale in doped polyacrylic acid studied by positron annihilation spectroscopy

被引：3
|
作者：
Gomaa, Ehsan [1 ]
机构：
[1] Ain Shams Univ, Fac Sci, Dept Phys, Cairo 11566, Egypt
来源：
PHYSICA B-CONDENSED MATTER | 2007年 / 390卷 / 1-2期
关键词：
positron annihilation; electric conductivity; polyacrylic acid;
D O I：
10.1016/j.physb.2006.08.015
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Polyacrylic acid (PAA) doped with carbon black (CB), chromium oxide (Cr2O3) and cupferron with different wt% (0.25%, 0.50%, 0.75%, and 1%) was studied using positron annihilation lifetime (PAL) technique and Doppler broadening of annihilation radiation (DBAR). Ortho-positronium lifetime components (tau(3) and I-3) were used to estimate the nanoscale free-volume hole sizes (Vf) and its fractions (f). It was found that the hole size V-f and its fractions f as well as S-parameters decreased at high value of doping concentration due to dopants-polymer formation. These results are supported by a significant narrowing in the nanoscale free-volume hole size distributions. The correlation between positron annihilation parameters and electric conductivity are discussed. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：203 / 208
页数：6
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