On the pressure dependence of salty aqueous eutectics

Brooke Chang, Anthony N. Consiglio, Drew Lilley, Ravi Prasher, Boris Rubinsky, Baptiste Journaux, Matthew J. Powell-Palm

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The eutectic is fundamental to multicomponent systems, defining the lowest temperature at which a given liquid phase is stable. Although binary aqueous eutectics have been broadly characterized at atmospheric pressure, eutectic data at high pressure are scarce, leaving critical gaps both in the data available for modeling and in our understanding of how eutectic equilibria may evolve with pressure. In this work, we deploy a simple, high-throughput, isochoric freezing method to measure the pressure dependences of five binary aqueous eutectics, chosen for their importance in compositional modeling of the distant icy planets deemed most likely to harbor life. Our data reveal that the pressure dependence of all the eutectics measured herein can be approximated by the pressure dependence of the ice Ih melting curve, providing a key rule of thumb for future analysis, and we further demonstrate multiple methods by which additional thermophysical properties of these high-pressure eutectics may be extracted from the measured pressure-temperature coordinates.

Original languageEnglish (US)
Article number100856
JournalCell Reports Physical Science
Volume3
Issue number5
DOIs
StatePublished - May 18 2022

Bibliographical note

Funding Information:
This work received financial support from the National Science Foundation (NSF) Graduate Research Fellowship under Grant No. DGE 1752814 as well by the NSF Engineering Research Center for Advanced Technologies for Preservation of Biological Systems (ATP-Bio) under NSF EEC Grant No. 1941543 . B.J. was supported by the Habitability of Hydrocarbon Worlds: Titan and Beyond nodes of NASA's Astrobiology Institute ( 08-NAI5-0021 and 17-NAI8- 2-017 ) and the NASA Solar System Workings grant 80NSSC17K0775 .

Publisher Copyright:
© 2022 The Author(s)

Keywords

  • aqueous thermodynamics
  • cryopreservation
  • high-pressure eutectic
  • icy worlds
  • isochoric freezing
  • multiphase coexistence
  • planetary science

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