4.6 Article

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

Journal

PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 22, Issue 17, Pages 9438-9447

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cp06082k

Keywords

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Funding

  1. Engineering and Physical Sciences Research Council (EPSRC) [EP/J009733/1, EP/J00975X/1, EP/K034995/1, EP/N007417/1]
  2. Leverhulme Trust [RPG-2018-350]
  3. European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [832703]
  4. European Research Council (ERC) [832703] Funding Source: European Research Council (ERC)
  5. EPSRC [EP/J00975X/1, EP/K034995/1, EP/J009733/1, EP/N007417/1] Funding Source: UKRI

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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.

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