Autor: Shpotyuk, O. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Coordination Defects in Vitreous As$\text{}_{2}$S$\text{}_{3}$ Induced by γ -irradiation
Autorzy:: Shpotyuk, O.
Balitska, V.
Powiązania:: https://bibliotekanauki.pl/articles/1967921.pdf
Data publikacji:: 1997-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.Jv
Opis:: Destruction-polymerization transformations in vitreous As$\text{}_{2}$S$\text{}_{3}$, 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$\text{}^{-1}$. All topological variants of these processes, statistically possible in the investigated samples, were taken into account for physical consideration of the real structural changes.
Źródło:: Acta Physica Polonica A; 1997, 92, 3; 577-583
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Modified Positron Annihilation Model for Glassy-Like As$\text{}_{2}$Se$\text{}_{3}$
Autorzy:: Kozdras, A.
Shpotyuk, O.
Kovalskiy, A.
Filipecki, J.
Powiązania:: https://bibliotekanauki.pl/articles/2043337.pdf
Data publikacji:: 2005-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.80.Ed
61.82.Ms
78.70.Bj
Opis:: 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$\text{}_{2}$Se$\text{}_{3}$ 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.
Źródło:: Acta Physica Polonica A; 2005, 107, 5; 832-836
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Water-Sorption Effects near Grain Boundaries in Modified MgO-Al₂O₃ Ceramics Tested with Positron-Positronium Trapping Algorithm
Autorzy:: Klym, H.
Ingram, A.
Shpotyuk, O.
Hadzaman, I.
Chalyy, D.
Powiązania:: https://bibliotekanauki.pl/articles/1030933.pdf
Data publikacji:: 2018-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.Je
07.07.Df
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2018, 133, 4; 864-868
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Physico-Chemical and Biological Properties of Arsenic Sulfide ($As_{55}S_{45}$) Nanosuspension Prepared by Milling
Autorzy:: Bujňáková, Z.
Shpotyuk, O.
Sedlák, J.
Pastorek, M.
Turianicová, E.
Baláž, P.
Ingram, A.
Powiązania:: https://bibliotekanauki.pl/articles/1375164.pdf
Data publikacji:: 2014-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.20.Wk
81.05.Kf
81.07.-b
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2014, 126, 4; 902-906
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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