ntvНаучно-технический вестник информационных технологий, механики и оптикиScientific and Technical Journal of Information Technologies, Mechanics and Optics2226-14942500-0373Университет ИТМО10.17586/2226-1494-2023-23-3-483-492ntv-8Research ArticleНОВЫЕ МАТЕРИАЛЫ И НАНОТЕХНОЛОГИИMATERIAL SCIENCE AND NANOTECHNOLOGIESИсследование гидратов диоксида углерода в тонких пленках методом FTIR-спектроскопии при температурах 11–180 КResearching carbon dioxide hydrates in thin films via FTIR spectroscopy at temperatures of 11–180 Khttps://orcid.org/0000-0002-6691-8346ГоликовО. Ю.GolikovO. Yu.

Голиков Олег Юрьевич —младший научный сотрудник, докторант 

sc 57843805800 

Алматы, 050038 

Oleg Yu. Golikov — Doctoral Student, Junior Researcher 

sc 57843805800 

Almaty, 050038 

golikov@physics.kzhttps://orcid.org/0000-0002-2232-2911ЕрежепД. Е.YerezhepD. E.

Ережеп Дархан Есейұлы — PhD, старший научный сотрудник 

sc 57194012596 

Алматы, 050038 

Darkhan E. Yerezhep — PhD, Senior Researcher 

sc 57194012596 

Almaty, 050038 

darhan_13@physics.kzhttps://orcid.org/0000-0001-7966-1140СоколовД. Ю.SokolovD. Yu.

Соколов Дмитрий Юрьевич — PhD, ассоциированный профессор 

sc 55318960400 

Алматы, 050038; Алматы, 050012 

Dmitry Yu. Sokolov — PhD, Associated Professor 

sc 55318960400 

Almaty, 050038;  Almaty, 050012 

yasnyisokol@gmail.comКазахский Национальный Университет им. аль-ФарабиКазахстанAl-Farabi Kazakh National UniversityKazakhstanКазахский Национальный Университет им. аль-Фараби ; Алматинский технологический университетРоссияAl-Farabi Kazakh National University ; Almaty Technoligical UniversityRussian Federation202310122024233483492Copyright © Голиков О.Ю., Ережеп Д.Е., Соколов Д.Ю., 20242024Голиков О.Ю., Ережеп Д.Е., Соколов Д.Ю.Golikov O.Y., Yerezhep D.E., Sokolov D.Y.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://ntv.elpub.ru/jour/article/view/8

Введение. Исследованы инфракрасные спектры тонких пленок смеси диоксида углерода (CO2) и воды (H2O), полученных методом осаждения из паровой фазы, в диапазоне температур 11–180 К. По результатам анализа спектров изучено образование гидратов и клатратов. Метод. Для исследования образующихся тонких пленок применены методы инфракрасной спектроскопии, масс-спектроскопии и оптического анализа. Инфракрасная спектроскопия с преобразованием Фурье (Fourier transform infrared, FTIR) позволила идентифицировать молекулярный состав и структурное состояние молекулярных смесей. Масс-спектроскопия и анализ интерференционной картины применены для дополнительного подтверждения образования определенных структур смеси CO2 и H2O. Основные результаты. Показано, что в смеси CO2 и H2O происходит образование гидратных и газово-гидратных структур CO2. Образованные гидратные соединения удерживают молекулы CO2 в своих структурах и не позволяют ему сублимировать при температуре сублимации свободного CO2 (93 К) при давлении Р = 0,5 мкторр. При этом температура сублимации связанных в гидратные структуры молекул CO2 лежит в интервале 147–150 К. Для выбранного соотношения концентраций CO2 (25 %) и H2O (75 %) показано, что изменение в спектрах и результаты масс-спектроскопии свидетельствуют о неполной гидрадизации смеси. Часть молекул CO2 остаются в свободном состоянии и сублимируют при более низкой температуре. Подтверждено, что увеличение показателя преломления при уменьшении концентрации H2O в смеси от 100 % до 25 % свидетельствует об увеличении менее плотных образований в сравнении с аморфными структурами конденсатов CO2 и H2O. Обсуждение. Полученные результаты расширяют знания о процессах клатратного и гидратного образований в смесях CO2 и H2O, о физических характеристиках их строения и изменении характеристик в зависимости от способа образования. Исследование представляет интерес для современной физики конденсированного состояния.

The IR spectra of thin films of a mixture of carbon dioxide and water were obtained using the physical vapor deposition method. They were researched in the temperature range of 11–180 K. Based on the results of the research; the formation of hydrates and clathrates was investigated. Several methods were used in the course of this research. These methods are mass spectroscopy, IR spectroscopy, and optical analysis of the thin films formed. Not only the molecular composition but also the state of the structure of molecular mixtures can be determined via Fourier transform infrared spectroscopy (FTIR). Additional data were needed to confirm the emergence of certain structures of carbon dioxide and water mixtures. The mass spectroscopy method and interference pattern analysis were utilized to obtain that data. Hydrate and gas hydrate structures of CO2 do form in the mixture of carbon dioxide and water. This was confirmed in the course of the experiments. The CO2 molecules are contained in their structures by the hydrate compounds formed, which prevents CO2 from sublimating at the sublimation temperature of free CO2 (93 K) under the pressure of P = 0.5 μTorr. Meanwhile, the sublimation temperature of CO2 molecules bound in hydrate structures becomes equal to 147–150 K. The ratio of CO2 and H2O concentrations was chosen to be 25 % and 75 %, respectively. For this ratio, the changes in the spectra and the results obtained via mass spectroscopy indicate incomplete hydration of the mixture. Still, some CO2 molecules remain free and sublimate at a lower temperature. It was found that the concurrent increase in the refractive index and decrease in the concentration of H2O from 100 % to 25 % indicate the growth of the formations that are less dense compared with the amorphous structures of CO2 and H2O condensates. The results obtained in the course of this research broaden the knowledge of the processes of clathrate and hydrate formation in mixtures of CO2 and H2O, the physical characteristics of their structures, and the changes in their characteristics depending on the way they are formed.

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