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PVP ‐stabilized arsenic sulfide A s 4 S 4 nanocomposites probed with positron annihilation lifetime spectroscopy
Author(s) -
Shpotyuk O.,
Ingram A.,
Shpotyuk Y.,
Bujňáková Z.,
Baláž P.
Publication year - 2017
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.24503
Subject(s) - positronium , materials science , polyvinylpyrrolidone , nanocomposite , positron , arsenic , spectroscopy , sulfide , positron annihilation spectroscopy , nanoparticle , realgar , chemical engineering , analytical chemistry (journal) , nanotechnology , crystallography , positron annihilation , mineralogy , polymer chemistry , chemistry , physics , metallurgy , organic chemistry , nuclear physics , quantum mechanics , engineering , electron
Atomic‐deficient nanostructurization in composites based on arsenic sulfide As 4 S 4 polymorphs, such as (1) β‐As 4 S 4 , (2) realgar α‐As 4 S 4 , and (3) mixture of realgar, pararealgar, and intermediate χ‐phase subjected to high‐energy mechanochemical milling in polyvinylpyrrolidone (PVP) solution, are studied exploring the method of positron annihilation lifetime spectroscopy. Positron lifetime spectra reconstructed from unconstrained x3‐term fitting procedure testify in a favor of mixed positron‐positronium trapping in the studied composites. Modified x3‐x2‐coupling decomposition algorithm is applied to parameterize expected annihilation channels in As 4 S 4 ‐PVP nanocomposites in respect to PVP matrix. Interfacial free‐volume voids between nanoparticles composed of arsenic sulfide crystallites embedded in PVP environment are defined as most favorable positron trapping sites, loosely packed in respect to variety of crystallographic polymorphs used for milling. POLYM. ENG. SCI., 57:502–505, 2017. © 2017 Society of Plastics Engineers