Laboratory Studies of the Clathrate Hydrate Formation in the Carbon Dioxide-Water Mixtures at Interstellar Conditions
Tychengulova A. Katpayeva K. Shomshekova S. Ibragimova S. Golikov O. Yerezhep D. Sokolov D. Aldiyarov A.
14 January 2025American Chemical Society
ACS Omega
2025#10Issue 11237 - 1248 pp.
This study investigates the formation of carbon dioxide clathrate hydrates under conditions simulating interstellar environments, a process of significant astrophysical and industrial relevance. Clathrate hydrates, where gas molecules are trapped within water ice cages, play an essential role in both carbon sequestration strategies and understanding of the behavior of ices in space. We employed a combination of Fourier Transform Infrared (FTIR) spectroscopy, mass spectrometry, temperature-programmed desorption (TPD), and Density Functional Theory (DFT) calculations to explore thin films of H2O:CO2 ice mixtures with varying CO2 concentrations (5-75%) prepared by vapor deposition at temperatures ranging between 11 and 180 K. The study revealed the influence of CO2 concentration and deposition temperature on the formation mechanism of diverse structures, including clathrate hydrates, polyaggregates, and segregated CO2 groups. Spectral features associated with CO2 encapsulation in clathrate hydrates were observed at 2335, 2349, and 3698 cm-1 in the 5 and 15% mixtures after deposition at 11 K and after warming at temperatures above 100 K. The observed increase in CO2 sublimation temperature to 145-155 K and co-condensation of CO2 molecules at 172 K with water molecules at a pressure of 0.5 μTorr can be attributed to the encapsulation of CO2 molecules within the robust hydrogen-bonded framework of the clathrate cages under specific conditions. These findings enhance our understanding of the intricate processes involved in clathrate and hydrate formation in CO2 and H2O mixtures, shedding light on their physical properties and the dependence of their specific characteristics on the formation method.
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Fesenkov Astrophysical Institute, Observatory 23, Almaty, 050020, Kazakhstan
Laboratory of Engineering Profile, Satbayev University, Satbayev str. 22, Almaty, 050013, Kazakhstan
Natural Sciences Research Institute, Ahmet Yassawi University, Sattarkhanov str. 29, Turkestan, 161200, Kazakhstan
Faculty of Physics and Technology, Al-Farabi Kazakh National University, Al-Farabi ave. 71/23, Almaty, 050040, Kazakhstan
Faculty of Engineering and Information Technology, Almaty Technological University, Tole Bi str. 100, Almaty, 050012, Kazakhstan
Fesenkov Astrophysical Institute
Laboratory of Engineering Profile
Natural Sciences Research Institute
Faculty of Physics and Technology
Faculty of Engineering and Information Technology
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