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Issue 9, 2018
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Calorimetric study of water's two glass transitions in the presence of LiCl

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Abstract

A DSC study of dilute glassy LiCl aqueous solutions in the water-dominated regime provides direct evidence of a glass-to-liquid transition in expanded high density amorphous (eHDA)-type solutions. Similarly, low density amorphous ice (LDA) exhibits a glass transition prior to crystallization to ice Ic. Both glass transition temperatures are independent of the salt concentration, whereas the magnitude of the heat capacity increase differs. By contrast to pure water, the glass transition endpoint for LDA can be accessed in LiCl aqueous solutions above 0.01 mole fraction. Furthermore, we also reveal the endpoint for HDA's glass transition, solving the question on the width of both glass transitions. This suggests that both equilibrated HDL and LDL can be accessed in dilute LiCl solutions, supporting the liquid–liquid transition scenario to understand water's anomalies.

Graphical abstract: Calorimetric study of water's two glass transitions in the presence of LiCl

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Article information


Submitted
29 Dec 2017
Accepted
31 Jan 2018
First published
07 Feb 2018

This article is Open Access

Phys. Chem. Chem. Phys., 2018,20, 6401-6408
Article type
Paper

Calorimetric study of water's two glass transitions in the presence of LiCl

G. N. Ruiz, K. Amann-Winkel, L. E. Bove, H. R. Corti and T. Loerting, Phys. Chem. Chem. Phys., 2018, 20, 6401
DOI: 10.1039/C7CP08677F

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