A liquid-liquid transition in supercooled aqueous solution related to the HDA-LDA transition

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Science  09 Mar 2018:
Vol. 359, Issue 6380, pp. 1127-1131
DOI: 10.1126/science.aao7049

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Unmasking supercooled water transitions

The unusual thermodynamic properties of water suggest that when supercooled, a second critical point should exist between two liquid phases that differ in density. Pure water crystallizes before such conditions can be reached. Woutersen et al. studied hydrazinium trifluoroacetate solutions that have similar hydrogen bonding to that of water. They observed a liquid-liquid transition near 190 K by using infrared spectroscopy and calorimetry. The liquid states were analogous to the predicted high- and low-density amorphous phases of water.

Science, this issue p. 1127