Skip to main content

Research Repository

Advanced Search

Observation of liquid–liquid phase transitions in ethane at 300 K

Proctor, JE; Bailey, M; Morrison, I; Hakeem, MA; Crowe, IF

Observation of liquid–liquid phase transitions in ethane at 300 K Thumbnail


Authors

M Bailey

MA Hakeem

IF Crowe



Abstract

We have conducted Raman spectroscopy
experiments on liquid ethane (C2H6) at 300 K, obtaining a
large amount of data at very high resolution. This has enabled
the observation of Raman peaks expected but not previously
observed in liquid ethane and a detailed experimental study of
the liquid that was not previously possible. We have observed a
transition between rigid and nonrigid liquid states in liquid
ethane at ca. 250 MPa corresponding to the recently proposed
Frenkel line, a dynamic transition between rigid liquid
(liquidlike) and nonrigid liquid (gaslike) states beginning in
the subcritical region and extending to arbitrarily high pressure
and temperature. The observation of this transition in liquid
(subcritical) ethane allows a clear differentiation to be made
between the Frenkel line (beginning in the subcritical region at
higher density than the boiling line) and the Widom lines (emanating from the critical point and not existing in the subcritical
region). Furthermore, we observe a narrow transition at ca. 1000 MPa to a second rigid liquid state. We propose that this
corresponds to a state in which orientational order must exist to achieve the expected density and can view the transition in
analogy to the transition in the solid state away from the orientationally disordered phase I to the orientationally ordered phases
II and III.

Citation

Proctor, J., Bailey, M., Morrison, I., Hakeem, M., & Crowe, I. (2018). Observation of liquid–liquid phase transitions in ethane at 300 K. Journal of Physical Chemistry B, 122(44), 10172-10178. https://doi.org/10.1021/acs.jpcb.8b07982

Journal Article Type Article
Acceptance Date Oct 16, 2018
Online Publication Date Oct 16, 2018
Publication Date Nov 8, 2018
Deposit Date Nov 8, 2018
Publicly Available Date Feb 22, 2019
Journal The Journal of Physical Chemistry B
Print ISSN 1520-6106
Publisher American Chemical Society
Volume 122
Issue 44
Pages 10172-10178
DOI https://doi.org/10.1021/acs.jpcb.8b07982
Publisher URL https://doi.org/10.1021/acs.jpcb.8b07982
Related Public URLs https://pubs.acs.org/journal/jpcbfk

Files







You might also like



Downloadable Citations