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First-order and gradual phase transitions of ethane confined in MCM-41.
Yang, Huan; Dejam, Morteza; Tan, Sugata P; Adidharma, Hertanto.
Afiliação
  • Yang H; Department of Petroleum Engineering, College of Engineering and Applied Science, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071-2000, USA. mdejam@uwyo.edu.
  • Dejam M; Department of Petroleum Engineering, College of Engineering and Applied Science, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071-2000, USA. mdejam@uwyo.edu.
  • Tan SP; Planetary Science Institute, Tucson, Arizona, 85719-2395, USA.
  • Adidharma H; Department of Petroleum Engineering, College of Engineering and Applied Science, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071-2000, USA. mdejam@uwyo.edu.
Phys Chem Chem Phys ; 24(30): 18161-18168, 2022 Aug 03.
Article em En | MEDLINE | ID: mdl-35861178
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. The occurrence of the gradual phase transition in nanopores, thus the confined supercriticality, is confirmed while our consistent DSC measurements are also well demonstrated.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Chem Chem Phys Assunto da revista: BIOFISICA / QUIMICA Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Chem Chem Phys Assunto da revista: BIOFISICA / QUIMICA Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Estados Unidos