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Free‐volume structure of polyvinylpyrrolidone‐capped glassy As 2 Se 3 nanocomposites prepared by mechanical milling
Author(s) -
Shpotyuk Oleh,
Ingram Adam,
Bujňáková Zdenka,
Baláž Peter,
Shpotyuk Yaroslav,
Slobodzyan Dmytro,
Woźny Mariusz,
BoussardPledel Catherine,
Bureau Bruno
Publication year - 2019
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25101
Subject(s) - polyvinylpyrrolidone , materials science , positron , nanocomposite , positronium , volume (thermodynamics) , nanoparticle , nanocrystal , positron lifetime spectroscopy , positron annihilation , chemical engineering , analytical chemistry (journal) , chemistry , nanotechnology , polymer chemistry , electron , thermodynamics , organic chemistry , physics , nuclear physics , engineering
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