First-order and gradual phase transitions of ethane confined in MCM-41
Abstract
The first-order phase transition of ethane confined in MCM-41, i.e., capillary condensation, has been measured using an isochoric cooling procedure by differential scanning calorimetry (DSC) under conditions ranging from 206 K and 1.1 bar up to the pore critical point (PCP). The PCP has also been determined using the three-line method developed earlier based on the vanishing heat of phase transition. As in the bulk phase, no first-order phase transition can occur above the critical point, which also implies that vapor can transform into liquid gradually by following a path around the critical point through the supercritical region. For the first time, the gradual phase transition is demonstrated with ethane in MCM-41, which is achieved through a multistep process with paths proceeding around the PCP without crossing the capillary-condensation curve. Finally, the occurrence of the gradual phase transition in nanopores, thus the confined supercriticality, is confirmed while our consistent DSC measurements are also well demonstrated.
- Authors:
-
[1];
[1];
[2];
[1]
- Univ. of Wyoming, Laramie, WY (United States)
- Planetary Science Institute, Tucson, AZ (United States)
- Publication Date:
- Research Org.:
- Univ. of Wyoming, Laramie, WY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1978870
- Alternate Identifier(s):
- OSTI ID: 1877301
- Grant/Contract Number:
- SC0021318
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Chemistry Chemical Physics. PCCP
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 30; Journal ID: ISSN 1463-9076
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemistry; Physics
Citation Formats
Yang, Huan, Dejam, Morteza, Tan, Sugata P., and Adidharma, Hertanto. First-order and gradual phase transitions of ethane confined in MCM-41. United States: N. p., 2022.
Web. doi:10.1039/d2cp02530b.
Yang, Huan, Dejam, Morteza, Tan, Sugata P., & Adidharma, Hertanto. First-order and gradual phase transitions of ethane confined in MCM-41. United States. https://doi.org/10.1039/d2cp02530b
Yang, Huan, Dejam, Morteza, Tan, Sugata P., and Adidharma, Hertanto. Mon .
"First-order and gradual phase transitions of ethane confined in MCM-41". United States. https://doi.org/10.1039/d2cp02530b. https://www.osti.gov/servlets/purl/1978870.
@article{osti_1978870,
title = {First-order and gradual phase transitions of ethane confined in MCM-41},
author = {Yang, Huan and Dejam, Morteza and Tan, Sugata P. and Adidharma, Hertanto},
abstractNote = {The first-order phase transition of ethane confined in MCM-41, i.e., capillary condensation, has been measured using an isochoric cooling procedure by differential scanning calorimetry (DSC) under conditions ranging from 206 K and 1.1 bar up to the pore critical point (PCP). The PCP has also been determined using the three-line method developed earlier based on the vanishing heat of phase transition. As in the bulk phase, no first-order phase transition can occur above the critical point, which also implies that vapor can transform into liquid gradually by following a path around the critical point through the supercritical region. For the first time, the gradual phase transition is demonstrated with ethane in MCM-41, which is achieved through a multistep process with paths proceeding around the PCP without crossing the capillary-condensation curve. Finally, the occurrence of the gradual phase transition in nanopores, thus the confined supercriticality, is confirmed while our consistent DSC measurements are also well demonstrated.},
doi = {10.1039/d2cp02530b},
journal = {Physical Chemistry Chemical Physics. PCCP},
number = 30,
volume = 24,
place = {United States},
year = {Mon Jul 11 00:00:00 EDT 2022},
month = {Mon Jul 11 00:00:00 EDT 2022}
}
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