Free‐volume structure of polyvinylpyrrolidone‐capped glassy As 2 Se 3 nanocomposites prepared by mechanical milling

The method of positron annihilation lifetime (PAL) spectroscopy was first employed to study atomic‐deficient free‐volume structure of nanocomposites prepared by high‐energy mechanical milling of glassy g‐As 2 Se 3 in water solution of polyvinylpyrrolidone (PVP). The formalism of x3‐x2‐CDA (coupling...

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Published in:Polymer engineering and science 2019-12, Vol.59 (12), p.2438-2442
Main Authors: Shpotyuk, Oleh, Ingram, Adam, Bujňáková, Zdenka, Baláž, Peter, Shpotyuk, Yaroslav, Slobodzyan, Dmytro, Woźny, Mariusz, Boussard‐Pledel, Catherine, Bureau, Bruno
Format: Article
Language:English
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Chemical Sciences
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Summary:The method of positron annihilation lifetime (PAL) spectroscopy was first employed to study atomic‐deficient free‐volume structure of nanocomposites prepared by high‐energy mechanical milling of glassy g‐As 2 Se 3 in water solution of polyvinylpyrrolidone (PVP). The formalism of x3‐x2‐CDA (coupling decomposition algorithm) describing conversion of bound positron‐electron (positronium Ps) states into positron traps was applied to identify free‐volume elements in pelletized PVP‐capped g‐As 2 Se 3 nanocomposite in respect to parent dry‐milled g‐As 2 Se 3 . Under wet milling, the internanoparticle Ps‐decaying sites in preferential PVP environment were shown to replace free‐volume positron traps in dry‐milled g‐As 2 Se 3 with defect‐specific positron lifetime of 0.352 ns, corresponding to diatomic/triatomic vacancies in g‐As‐Se matrix. POLYM. ENG. SCI., 59:2438–2442, 2019. © 2019 Society of Plastics Engineers
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.25101