NMR Investigation of the Quasi-Brine Layer in Ice/Brine Mixtures
We report the study of a liquid-like phase that is found in dilute NaCl aqueous solutions frozen at temperatures below the liquid-to-solid phase transition temperatures of H2O and NaCl-2H2O. The fractions of water and NaCl in this sub-eutectic quasi-liquid phase were measured by NMR spectroscopy, and the experimental results compared to predictions derived from an equilibrium thermodynamic analysis. A numerical model derived from the NaCl water phase diagram and freezing point depression curve was found to provide a quantitative description of the quasi-liquid fraction for data measured above the eutectic temperature. The relevance and application of these findings to the study of chemistry in polar regions are discussed.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 860116
- Report Number(s):
- PNNL-SA-35863; 2058; KP1301030; TRN: US200523%%87
- Journal Information:
- Journal of Physical Chemistry B, Vol. 106, Issue 43
- Country of Publication:
- United States
- Language:
- English
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