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Coordination Defects in Vitreous As_{2}S_{3} Induced by γ -irradiation

100%
Shpotyuk O., Balitska V.
Acta Physica Polonica A
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1997
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vol. 92
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issue 3
577-583
EN
Destruction-polymerization transformations in vitreous As_{2}S_{3}, associated with coordination defects formation processes induced by γ-irradiation, were studied by the IR Fourier spectroscopy method in the region of 400-100 cm^{-1}. All topological variants of these processes, statistically possible in the investigated samples, were taken into account for physical consideration of the real structural changes.
2
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Modified Positron Annihilation Model for Glassy-Like As_2Se_3

81%
Kozdras A., Shpotyuk O., Kovalskiy A., Filipecki J.
Acta Physica Polonica A
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2005
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vol. 107
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issue 5
832-836
EN
An approach to structural characterization of chalcogenide glasses based on the study of void distribution is discussed. The results of positron annihilation lifetime spectra measurements for glassy-like g-As_2Se_3 are compared with nano-void distribution data obtained from Monte Carlo simulation. In this consideration perspectives to involve the parameters of nano-voids calculated from the first sharp diffraction peak in the framework of known Elliott's model are analyzed.
3
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Water-Sorption Effects near Grain Boundaries in Modified MgO-Al₂O₃ Ceramics Tested with Positron-Positronium Trapping Algorithm

71%
Klym H., Ingram A., Shpotyuk O., Hadzaman I., Chalyy D.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
864-868
EN
Water-sorption processes near grain boundaries in the MgO-Al₂O₃ ceramics prepared at different temperatures were studied using positron annihilation lifetime spectroscopy. Numerical values of three- and four-component treatment of spectra were used for study of physical- and chemical-sorption processes in the MgO-Al₂O₃ ceramics. To apply mathematical approach in the form of positron-positronium trapping algorithm into three-component treatment of positron annihilation lifetime spectra it was shown that physical-adsorbed water did not modify positron trapping sites near grain boundaries in water-immersed MgO-Al₂O₃ ceramics and localized mainly in nanopores. The chemically-adsorbed water modifies structural extended defects located near grain boundaries that accompanied them by void fragmentation at water desorption.
4
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Physico-Chemical and Biological Properties of Arsenic Sulfide (As_{55}S_{45}) Nanosuspension Prepared by Milling

61%
Bujňáková Z., Shpotyuk O., Sedlák J., Pastorek M., Turianicová E., Baláž P., Ingram A.
Acta Physica Polonica A
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2014
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vol. 126
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issue 4
902-906
EN
Nanosuspension based on melt-quenched arsenic sulfide of nominal As_{55}S_{45} composition was prepared by nanomilling and tested as potential anticancer drug. Polyvinylpyrrolidone was used as steric stabilizer and inhibitor of agglomeration. Individual nanoparticles had average size of 192 nm (determined by photon cross-correlation spectroscopy) and had several times better dissolution ability in comparison with bulk As_{55}S_{45}. Effect of nanomilling is shown to be associated with formation of arsenic sulfide crystalline nanoparticles and free-volume entities located at the interface between nanoparticles and surrounding matrix as it follows from positron annihilation measurements. Cytotoxicity tests were performed using human melanoma cell line Bowes and confirmed high toxicity of the studied nanosuspension.
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