Thermodynamic analysis of the stability of planar interfaces between coexisting phases and its application to supercooled water
Journal Article
·
· Journal of Chemical Physics
- Princeton Univ., NJ (United States); Indian Inst. of Science Education and Research (IISER), Tirupati (India); DOE/OSTI
- Univ. of Houston, TX (United States)
- Princeton Univ., NJ (United States)
Two-phase simulations are commonly used to evaluate coexistence conditions, interfacial tensions, and other thermodynamic properties associated with first-order phase transitions. Calculation of these properties is often simplified when the interfaces between the two phases are flat or planar. In this paper, we derive a general thermodynamic criterion for selecting simulation cell dimensions to stabilize planar interfaces in phase-separated fluid-fluid systems with respect to homogeneous, single-phase states. The resulting expression is validated by analyzing the effects of simulation cell dimensions on the formation of planar liquid-vapor interfaces in the Lennard-Jones fluid and in the TIP4P/2005 model of water. We also perform large scale molecular dynamics simulations to study metastable liquid-liquid phase separation in the ST2 and TIP4P/2005 models of water under deeply supercooled conditions. Our simulations confirm the stability of a liquid-liquid interface in ST2, and they demonstrate that the corresponding interface for TIP4P/2005 can be stabilized by judiciously choosing the simulation cell aspect ratio in a manner consistent with the thermodynamic criterion. We posit that this sensitivity to the simulation cell aspect ratio may explain discrepancies between previous studies examining liquid-liquid separation in models of supercooled water.
- Research Organization:
- Princeton Univ., NJ (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Welch Foundation
- Grant/Contract Number:
- SC0002128; SC0019394
- OSTI ID:
- 1610631
- Alternate ID(s):
- OSTI ID: 1525525
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 22 Vol. 150; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Supercooled water: A polymorphic liquid with a cornucopia of behaviors
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