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Positron annihilation lifetime spectroscopy of nano/macroporous bioactive glasses

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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.

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ACKNOWLEDGMENTS

The authors thank U.S. National Science Foundation through IMI-NFG (Grant No. DMR-0844014), for initiating the international collaboration and providing partial financial support for this work. SW and HJ thank the National Science Foundation for support via the Materials World Network (DMR-0602975) program

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Lehigh University, Bethlehem, Pennsylvania, 18015-3195, USA

    Roman Golovchak, Shaojie Wang & Himanshu Jain

  2. Department of Physics of Opole University of Technology, Opole, PL-45370, Poland

    Adam Ingram

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  1. Roman Golovchak
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  2. Shaojie Wang
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Correspondence to Roman Golovchak.

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This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr-editor-manuscripts/

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Golovchak, R., Wang, S., Jain, H. et al. Positron annihilation lifetime spectroscopy of nano/macroporous bioactive glasses. Journal of Materials Research 27, 2561–2567 (2012). https://doi.org/10.1557/jmr.2012.252

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