http://dspace.nbuv.gov.ua:80/handle/123456789/114439 Mon, 13 Apr 2026 15:57:55 GMT 2026-04-13T15:57:55Z http://dspace.nbuv.gov.ua:80/bitstream/id/340877/ http://dspace.nbuv.gov.ua:80/handle/123456789/114439 http://dspace.nbuv.gov.ua:80/handle/123456789/121861 Publication Ethics and Publication Malpractice Statement Fri, 01 Jan 2016 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121861 2016-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/121683 Polyvinylcarbazole films: Applications for chemical sensors Kruglenko, I.V. The adsorption properties of polyvinylcarbazole (PVC) films as sensitive layers of quartz crystal microbalance (QCM) sensors have been studied. Different organic vapors and complex mixture (a cologne) were tested as analytes. PVC films have demonstrated different adsorption properties under different temperatures. This makes it a perspective material for sensor applications. Fri, 01 Jan 2016 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121683 2016-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/121682 The non-linear dependence of 6СНВТ liquid crystal conductivity on the concentration of gold nanoparticles Kovalchuk, O.V.; Kopčansky, P.; Timko, M.; Studenyak, I.P.; Kovalchuk, T.M. Within the frequency range 10⁻¹…10⁶ Hz at the temperature 293 K, the effect of gold nanoparticles on the dielectric properties of the planar-oriented nematic liquid crystal 6СНВТ has been studied. The concentration of nanoparticles with the average diameter 3 to 5 nm was chosen as 0.01, 0.02 and 0.1 wt.%. It has been shown that for the frequencies less than 10 Hz, the dielectric properties of the samples can be described with the Debye dispersion. For the samples with the concentration of gold nanoparticles 0.1 wt.%, the time of relaxation has been estimated (4.7±0.5 s). It has been also shown that the conductivity of the liquid crystal depends non-linearly on the concentration of nanoparticles introduced into the liquid crystal. The greatest change in conductivity of the liquid crystal on the concentration of introduced gold nanoparticles has been obtained within the range of 0.01 to 0.02 wt.%. It has been assumed that the conductivity of 6СНВТ that depends non-linearly on the concentration of introduced gold nanoparticles is caused by the competing processes of ion desorption from the gold nanoparticles and of nanoparticle aggregation. Fri, 01 Jan 2016 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121682 2016-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/121681 Long-term radiation-induced optical darkening effects in chalcogenide glasses Kavetskyy, T.S. In this work, it is reported that the γ-irradiated (2.41 MGy accumulated dose) glasses As₂S₃ (∼2 mm thick) and Ge₁₅.₈As₂₁S₆₃.₂ (∼1 mm thick), both measured ∼10 years after γ-irradiation, exhibit radiation-induced optical darkening effect (i.e., long-wave shift of fundamental optical absorption edge). In the case of As₂S₃ glass, the observed longterm radiation-induced optical darkening effect is well comparable with that reported in literature for γ-irradiated (∼3 MGy accumulated dose) glass As₂S₃ (1.5 mm thick), measured directly after γ-irradiation. In view of practical application, this finding demonstrates the possibilities for development of innovative chalcogenide glass based long-term dosimeter systems with stable and controlled parameters. A possible general criterion for mechanisms of long-term radiation-induced structural changes in chalcogenide glasses has been also considered. Fri, 01 Jan 2016 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121681 2016-01-01T00:00:00Z