Experimental observation of nanophase segregation of aqueous salt solutions around the predicted liquid-liquid transition in water

Lane, P. D., Reichenbach, J., Farrell, A. J., Ramakers, L. A.I., Adamczyk, K., Hunt, N. T. and Wynne, K. (2020) Experimental observation of nanophase segregation of aqueous salt solutions around the predicted liquid-liquid transition in water. Physical Chemistry Chemical Physics, 17, 9438. (doi: 10.1039/C9CP06082K) (PMID:32314750)

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Abstract

The liquid-liquid transition in supercooled liquid water, predicted to occur around 220 K, is controversial due to the difficulty of studying it caused by competition from ice crystallization (the so-called “no man’s land”). In aqueous solutions, it has been predicted to give rise to phase separation on a nanometer scale between a solute-rich high-density phase and a water-rich low-density phase. Here we report direct experimental evidence for the formation of a nanosegregated phase in eutectic aqueous solutions of LiCl and LiSCN where the presence of crystalline water can be experimentally excluded. Femtosecond infrared and Raman spectroscopies are used to determine the temperature-dependent structuring of water, the solvation of the SCN- anion, and the size of the phase segregated domains.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Wynne, Professor Klaas and Reichenbach, Miss Judith and Farrell, Mr Andrew
Authors: Lane, P. D., Reichenbach, J., Farrell, A. J., Ramakers, L. A.I., Adamczyk, K., Hunt, N. T., and Wynne, K.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Physical Chemistry Chemical Physics
Publisher:Royal Society of Chemistry
ISSN:1463-9076
ISSN (Online):1463-9084
Published Online:14 April 2020
Copyright Holders:This journal is © the Owner Societies 2020
First Published:First published in Physical Chemistry Chemical Physics 17:9438
Publisher Policy:Reproduced under a Creative Commons Licence
Data DOI:http://researchdata.gla.ac.uk/1001/

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