МЕЗОФАЗО- ТА СКЛОУТВОРЕННЯ В БІНАРНИХ СИСТЕМАХ АЛКАНОАТІВ ЦЕЗІЮ ТА БАРІЮ
Phase equilibria in binary systems of individually non-mesomorphic components: propionates, isobutyrates, butyrates and valerates of cesium and barium at temperatures from 20 to 400 °C have been investigated by the methods of differential thermal analysis and polarization polythermal microscopy. In...
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| Дата: | 2021 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
V.I.Vernadsky Institute of General and Inorganic Chemistry
2021
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| Онлайн доступ: | https://ucj.org.ua/index.php/journal/article/view/330 |
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| Назва журналу: | Ukrainian Chemistry Journal |
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oai:ojs2.1444248.nisspano.web.hosting-test.net:article-3302021-10-04T14:27:11Z MESOPHASE AND GLASS FORMATION IN BINARY SYSTEMS CEASIUM AND BARIUM ALKANOATESMESOPHASE AND GLASS FORMATION IN BINARY SYSTEMS CEASIUM AND BARIUM ALKANOATES МЕЗОФАЗО- ТА СКЛОУТВОРЕННЯ В БІНАРНИХ СИСТЕМАХ АЛКАНОАТІВ ЦЕЗІЮ ТА БАРІЮ Mirnaya, Tatiana Yaremchuk, Galina Bylina , Denis ionic liquid crystals, mesophase, metal alkanoates, mesomorphic glass. Phase equilibria in binary systems of individually non-mesomorphic components: propionates, isobutyrates, butyrates and valerates of cesium and barium at temperatures from 20 to 400 °C have been investigated by the methods of differential thermal analysis and polarization polythermal microscopy. In all systems, the formation of intermediate liquid-crystalline solutions of smectic modification (type A) was established. The temperature-concentration regions of the formation of ionic liquid crystals and glasses are determined. The studies carried out show that in binary systems of cesium and barium alkanoates intermediate liquid-crystal solutions are generated due to the latent mesomorphism of the corresponding cesium alkanoate and due to the eutectic decrease in liquidus temperatures in the binary systems. The thermal stability of the induced mesophase in the case of systems of the considered type is influenced by the following factors: the degree of ordering of the melt, which correlates with the length of the alkyl chain of the alkanoate anion, and a decrease in the temperatures of the liquidus line relative to the latent clearing temperature. The possible influence of compounds melting congruently or incongruently, formed in binary systems, should also be taken into account. Experimental data indicate the largest temperature-concentration range of the mesophase in the butyrate system, where there are the most favorable conditions for the implementation of intermediate liquid crystal solutions. Such conditions are the largest decrease in liquidus temperatures in a series of systems relative to the latent clearing point, as well as an additional increase in thermal stability due to the formation of a congruently melting compound of anisometric structure. In the case of the valerate system, a certain increase in anisotropy in comparison with the butyrate system is leveled by high liquidus temperatures; here is the narrowest region of existence of the intermediate mesophase due to its thermal destabilization. V.I.Vernadsky Institute of General and Inorganic Chemistry 2021-08-26 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/330 10.33609/2708-129X.87.07.2021.25-31 Ukrainian Chemistry Journal; Vol. 87 No. 7 (2021): Ukrainian Chemistry Journal; 25-31 Украинский химический журнал; Том 87 № 7 (2021): Ukrainian Chemistry Journal; 25-31 Український хімічний журнал; Том 87 № 7 (2021): Український хімічний журнал; 25-31 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/330/177 |
| institution |
Ukrainian Chemistry Journal |
| baseUrl_str |
|
| datestamp_date |
2021-10-04T14:27:11Z |
| collection |
OJS |
| language |
English |
| topic_facet |
ionic liquid crystals mesophase metal alkanoates mesomorphic glass. |
| format |
Article |
| author |
Mirnaya, Tatiana Yaremchuk, Galina Bylina , Denis |
| spellingShingle |
Mirnaya, Tatiana Yaremchuk, Galina Bylina , Denis МЕЗОФАЗО- ТА СКЛОУТВОРЕННЯ В БІНАРНИХ СИСТЕМАХ АЛКАНОАТІВ ЦЕЗІЮ ТА БАРІЮ |
| author_facet |
Mirnaya, Tatiana Yaremchuk, Galina Bylina , Denis |
| author_sort |
Mirnaya, Tatiana |
| title |
МЕЗОФАЗО- ТА СКЛОУТВОРЕННЯ В БІНАРНИХ СИСТЕМАХ АЛКАНОАТІВ ЦЕЗІЮ ТА БАРІЮ |
| title_short |
МЕЗОФАЗО- ТА СКЛОУТВОРЕННЯ В БІНАРНИХ СИСТЕМАХ АЛКАНОАТІВ ЦЕЗІЮ ТА БАРІЮ |
| title_full |
МЕЗОФАЗО- ТА СКЛОУТВОРЕННЯ В БІНАРНИХ СИСТЕМАХ АЛКАНОАТІВ ЦЕЗІЮ ТА БАРІЮ |
| title_fullStr |
МЕЗОФАЗО- ТА СКЛОУТВОРЕННЯ В БІНАРНИХ СИСТЕМАХ АЛКАНОАТІВ ЦЕЗІЮ ТА БАРІЮ |
| title_full_unstemmed |
МЕЗОФАЗО- ТА СКЛОУТВОРЕННЯ В БІНАРНИХ СИСТЕМАХ АЛКАНОАТІВ ЦЕЗІЮ ТА БАРІЮ |
| title_sort |
мезофазо- та склоутворення в бінарних системах алканоатів цезію та барію |
| title_alt |
MESOPHASE AND GLASS FORMATION IN BINARY SYSTEMS CEASIUM AND BARIUM ALKANOATESMESOPHASE AND GLASS FORMATION IN BINARY SYSTEMS CEASIUM AND BARIUM ALKANOATES |
| description |
Phase equilibria in binary systems of individually non-mesomorphic components: propionates, isobutyrates, butyrates and valerates of cesium and barium at temperatures from 20 to 400 °C have been investigated by the methods of differential thermal analysis and polarization polythermal microscopy. In all systems, the formation of intermediate liquid-crystalline solutions of smectic modification (type A) was established. The temperature-concentration regions of the formation of ionic liquid crystals and glasses are determined. The studies carried out show that in binary systems of cesium and barium alkanoates intermediate liquid-crystal solutions are generated due to the latent mesomorphism of the corresponding cesium alkanoate and due to the eutectic decrease in liquidus temperatures in the binary systems. The thermal stability of the induced mesophase in the case of systems of the considered type is influenced by the following factors: the degree of ordering of the melt, which correlates with the length of the alkyl chain of the alkanoate anion, and a decrease in the temperatures of the liquidus line relative to the latent clearing temperature. The possible influence of compounds melting congruently or incongruently, formed in binary systems, should also be taken into account. Experimental data indicate the largest temperature-concentration range of the mesophase in the butyrate system, where there are the most favorable conditions for the implementation of intermediate liquid crystal solutions. Such conditions are the largest decrease in liquidus temperatures in a series of systems relative to the latent clearing point, as well as an additional increase in thermal stability due to the formation of a congruently melting compound of anisometric structure. In the case of the valerate system, a certain increase in anisotropy in comparison with the butyrate system is leveled by high liquidus temperatures; here is the narrowest region of existence of the intermediate mesophase due to its thermal destabilization. |
| publisher |
V.I.Vernadsky Institute of General and Inorganic Chemistry |
| publishDate |
2021 |
| url |
https://ucj.org.ua/index.php/journal/article/view/330 |
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| first_indexed |
2025-09-24T17:43:40Z |
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2025-09-24T17:43:40Z |
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