Autor: Burakowski, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Positron annihilation and speed of sound in the systems containing beta-cyclodextrin
Autorzy:: Jerie, K.
Baranowski, A.
Burakowski, A.
Gliński, J.
Powiązania:: https://bibliotekanauki.pl/articles/146303.pdf
Data publikacji:: 2010
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: sound speed
compressibility
positron annihilation
cyclodextrin
alcohol
inclusion compounds
Opis:: Positron annihilation measurements were performed in aqueous solutions of beta-cyclodextrin, as well as in solid mixtures of this sugar with a long-chained alcohol, n-nonanol. Additionally, acoustic (sound speed, density and compressibility) experiments were done in aqueous beta-cyclodextrin and tert-butanol systems and in a three-component water-beta-cyclodextrin-tert-butanol system. The results show that in aqueous solution cyclodextrin does not form inclusive complexes with alcohol, while solid sugar-alcohol mixtures undergo slow changes in time, most probably caused by exchange of guest between interior and exterior of the host molecule.
Źródło:: Nukleonika; 2010, 55, 1; 65-68
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Structure of Aqueous Solutions of Acetonitrile Investigated by Acoustic and Positron Annihilation Measurements
Autorzy:: Jerie, K.
Baranowski, A.
Koziol, S.
Gliński, J.
Burakowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/2043335.pdf
Data publikacji:: 2005-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.25.Em
78.70.Bj
Opis:: We report the results of acoustic and positron annihilation measurements in aqueous solutions of acetonitrile (CH$\text{}_{3}$CN). Hydrophobicity of the solute is discussed, as well as the possibility of describing the title system in terms of hydrophobic solvation. The concept of Levay et al. of calculating the "ideal positronium lifetimes is applied, basing on the mean volume of cavities (holes) in liquid structure available for positronium pseudoatom. The same calculations performed using the Tao model of annihilation yield very different results. It can be concluded that either acetonitrile forms with water clathrate-like hydrates of untypical architecture, or it is too weak hydrophobic agent to form clathrate-like hydrates at all. The former interpretation seems to be more probable.
Źródło:: Acta Physica Polonica A; 2005, 107, 5; 826-831
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Investigation of Sol-Gel Glasses Doped with Lanthanide Ions by Spectroscopic, Acoustic, and Positron Annihilation Methods
Autorzy:: Jerie, K.
Baranowski, A.
Legendziewicz, J.
Guzik, M.
Burakowski, A.
Gliński, J.
Powiązania:: https://bibliotekanauki.pl/articles/2047126.pdf
Data publikacji:: 2006-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 32.30.Jc
43.35.Cg
61.20.Qg
61.25.Em
62.60.+v
78.70.Bj
Opis:: The results of optical spectroscopic (UV-Vis, absorption, and emission), acoustic (sound velocity of precursor solutions, the solvation numbers of ions in these solutions), and positron annihilation of glasses are presented and discussed for silica glasses obtained by the alcoholic sol-gel technique, doped with selected lanthanides and with some addition of ethylene glycol. The aim of these investigations was the determination of the local structure of glass close to lanthanide ions and its influence on the optical properties of the material. The results show that the existence of alcohol-glycol solvates in glasses decrease the number of empty voids in its structure as well as the size of the remaining ones. One can suppose that this is caused by cooperative interactions of glycol molecules with the network of hydrogen bonds of the glass.
Źródło:: Acta Physica Polonica A; 2006, 110, 5; 583-591
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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