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On thermal stability of cryovacuum deposited CH4+H2O films
- Whereas stable homogenous states of aqueous hydrocarbon solutions are typically observed at high temperatures and pressures far beyond the critical values corresponding to individual components, the stability of such system may be preserved upon transition into the region of metastable states at low temperatures and low pressures. This work is dedicated to the study of the thermal stability of a water-methane mixture formed by cryogenic vapor phase deposition. The obtained thin films were studied using vibrational spectroscopy in the temperature range of 16-180 K. During thermal annealing of the samples, characteristic vibrational C-H modes of methane were monitored alongside the chamber pressure to register both structural changes and desorption of the film material. The obtained results reveal that upon the co-deposition of methane and water, methane molecules appear both in non-bound and trapped states. The observed broadening of the characteristic C-H stretching mode at 3010 cm(-1) upon an increase in temperature of the sampleWhereas stable homogenous states of aqueous hydrocarbon solutions are typically observed at high temperatures and pressures far beyond the critical values corresponding to individual components, the stability of such system may be preserved upon transition into the region of metastable states at low temperatures and low pressures. This work is dedicated to the study of the thermal stability of a water-methane mixture formed by cryogenic vapor phase deposition. The obtained thin films were studied using vibrational spectroscopy in the temperature range of 16-180 K. During thermal annealing of the samples, characteristic vibrational C-H modes of methane were monitored alongside the chamber pressure to register both structural changes and desorption of the film material. The obtained results reveal that upon the co-deposition of methane and water, methane molecules appear both in non-bound and trapped states. The observed broadening of the characteristic C-H stretching mode at 3010 cm(-1) upon an increase in temperature of the sample from 16 to 90 K, followed by narrowing of the peak as the temperature is reduced back to 16 K, indicates localization of methane molecules within the water matrix at lower temperatures.…
Author details: | Abdurakhman AldiyarovORCiD, Dmitriy SokolovORCiD, Aigerim Akylbayeva, Assel Nurmukan, Nurlan TokmoldinORCiDGND |
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DOI: | https://doi.org/10.1063/10.0002156 |
ISSN: | 1063-777X |
ISSN: | 1090-6517 |
Title of parent work (English): | Low temperature physics |
Publisher: | American Institute of Physics |
Place of publishing: | Melville |
Publication type: | Article |
Language: | English |
Date of first publication: | 2020/11/01 |
Publication year: | 2020 |
Release date: | 2023/11/13 |
Tag: | low; methane localization; molecular crystals; temperature; vibrational spectroscopy; water-methane films |
Volume: | 46 |
Issue: | 11 |
Number of pages: | 4 |
First page: | 1121 |
Last Page: | 1124 |
Funding institution: | Ministry of Education and Science of the Republic of; KazakhstanGovernment of the Republic of KazakhstanMinistry of Education; and Science of the Republic of Kazakhstan [IRN AP05130123, AP08052736] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer review: | Referiert |