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Positron annihilation lifetime spectroscopy of nano/macroporous bioactive glasses

Published online by Cambridge University Press:  02 August 2012

Roman Golovchak ,
Shaojie Wang ,
Himanshu Jain  and
Adam Ingram
Roman Golovchak*
Affiliation:
Department of Materials Science and Engineering, Lehigh University, Bethlehem, Pennsylvania18015-3195
Shaojie Wang
Affiliation:
Department of Materials Science and Engineering, Lehigh University, Bethlehem, Pennsylvania18015-3195
Himanshu Jain
Affiliation:
Department of Materials Science and Engineering, Lehigh University, Bethlehem, Pennsylvania18015-3195
Adam Ingram
Affiliation:
Department of Physics of Opole University of Technology, Opole, PL-45370, Poland
*
a)Address all correspondence to this author. e-mail: ryh206@lehigh.edu
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Abstract

Positron annihilation lifetime measurements are performed for sol–gel-derived 70 mol% SiO2–30 mol% CaO bioactive glass. Strong positronium formation processes are shown to be an inherent feature for these kinds of materials. Observed orthopositronium (o-Ps) lifetimes show a three-modal distribution with lifetime values weighed at ∼2, ∼18, and ∼70 ns. The exposure of the investigated sol–gel-derived bioactive glasses to water vapor significantly modifies o-Ps lifetime distribution due to the penetration of water molecules into the nanopores, indicating high ratio of their interconnectivity. Classic Tao–Eldrup equation is used to relate the o-Ps lifetimes with the size of nanopores, whose distribution is verified by nitrogen adsorption porosimetry.

Keywords

bioglasspositron annihilationporosimetry

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Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 19 , 14 October 2012 , pp. 2561 - 2567
Copyright
Copyright © Materials Research Society 2012

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