Природа динамiчного кросовера в ортотерфенiлi
We have conducted the infrared spectroscopic study and differential scanning calorimetry measurements (DSC) on orthoterphenyl (OTP), aiming to explore the physical nature of the dynamic crossover at 1.2Tg found in variety experiments on OTP. We have obtained that, at T ≤ 1.2Tg&...
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| Дата: | 2018 |
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| Автори: | , , , , |
| Формат: | Стаття |
| Мова: | English |
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Publishing house "Academperiodika"
2018
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| Онлайн доступ: | https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018443 |
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| Назва журналу: | Ukrainian Journal of Physics |
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ujp2-article-20184432019-03-29T09:01:22Z Nature of the Dynamic Crossover in Orthoterphenyl Природа динамiчного кросовера в ортотерфенiлi Baran, J. Davydova, N. A. Drozd, M. Ponezha, E. A. Reznichenko, V. Ya. differential scanning calorimetry infrared spectroscopy glass transition nucleation orthoterphenyl supercooled liquids We have conducted the infrared spectroscopic study and differential scanning calorimetry measurements (DSC) on orthoterphenyl (OTP), aiming to explore the physical nature of the dynamic crossover at 1.2Tg found in variety experiments on OTP. We have obtained that, at T ≤ 1.2Tg (∼290 K) in the supercooled liquid OTP, the crystal nuclei appear and are absent at higher temperatures. These results suggest that the origin of the dynamic crossover at 1.2Tg is related to the formation of fluctuating nuclei in the supercooled liquid, as a temperature of 1.2Tg is approached. Therefore, we would expect that the appearance of the nuclei would change the molecular dynamics from individual to cooperative. Ми використовували метод iнфрачервоної спектроскопiї й диференцiально-скануючої калориметрiї (ДСК) з метою встановлення фiзичної природи динамiчного кросовера при температурi 1,2Tg в ортотерфенiлi (ОТР), який був виявлен в багатьох експериментах на ОТР. Ми одержали, що при температурах T ≤ 1,2Tg (∼290 K) у переохолодженому рiдкому ОТР утворюються кристалiчнi зародки, що вiдсутнi при бiльш високих температурах. Цi результати свiдчать, що природа динамiчного кросовера при температурi 1,2Tg пов’язана з утворенням флуктуюючих зародкiв у переохолодженiй рiдинi при досягненнi температури 1,2Tg. Тому необхiдно очiкувати, що поява зародкiв приведе до змiни молекулярної динамiки вiд iндивiдуальної до кооперативної. Publishing house "Academperiodika" 2018-10-19 Article Article Peer-reviewed Рецензована стаття application/pdf https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018443 10.15407/ujpe59.03.0292 Ukrainian Journal of Physics; Vol. 59 No. 3 (2014); 292 Український фізичний журнал; Том 59 № 3 (2014); 292 2071-0194 2071-0186 10.15407/ujpe59.03 en https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018443/449 Copyright (c) 2018 Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine |
| institution |
Ukrainian Journal of Physics |
| baseUrl_str |
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| datestamp_date |
2019-03-29T09:01:22Z |
| collection |
OJS |
| language |
English |
| topic_facet |
differential scanning calorimetry infrared spectroscopy glass transition nucleation orthoterphenyl supercooled liquids |
| format |
Article |
| author |
Baran, J. Davydova, N. A. Drozd, M. Ponezha, E. A. Reznichenko, V. Ya. |
| spellingShingle |
Baran, J. Davydova, N. A. Drozd, M. Ponezha, E. A. Reznichenko, V. Ya. Природа динамiчного кросовера в ортотерфенiлi |
| author_facet |
Baran, J. Davydova, N. A. Drozd, M. Ponezha, E. A. Reznichenko, V. Ya. |
| author_sort |
Baran, J. |
| title |
Природа динамiчного кросовера в ортотерфенiлi |
| title_short |
Природа динамiчного кросовера в ортотерфенiлi |
| title_full |
Природа динамiчного кросовера в ортотерфенiлi |
| title_fullStr |
Природа динамiчного кросовера в ортотерфенiлi |
| title_full_unstemmed |
Природа динамiчного кросовера в ортотерфенiлi |
| title_sort |
природа динамiчного кросовера в ортотерфенiлi |
| title_alt |
Nature of the Dynamic Crossover in Orthoterphenyl |
| description |
We have conducted the infrared spectroscopic study and differential scanning calorimetry measurements (DSC) on orthoterphenyl (OTP), aiming to explore the physical nature of the dynamic crossover at 1.2Tg found in variety experiments on OTP. We have obtained that, at T ≤ 1.2Tg (∼290 K) in the supercooled liquid OTP, the crystal nuclei appear and are absent at higher temperatures. These results suggest that the origin of the dynamic crossover at 1.2Tg is related to the formation of fluctuating nuclei in the supercooled liquid, as a temperature of 1.2Tg is approached. Therefore, we would expect that the appearance of the nuclei would change the molecular dynamics from individual to cooperative. |
| publisher |
Publishing house "Academperiodika" |
| publishDate |
2018 |
| url |
https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018443 |
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2025-10-02T01:14:45Z |
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