Jump to main content
Jump to site search

Issue 27, 2015
Previous Article Next Article

The puzzling first-order phase transition in water–glycerol mixtures

Author affiliations

Abstract

Over the last decade, discussions on a possible liquid–liquid transition (LLT) have strongly intensified. The LLT proposed by several authors focused mostly on explaining the anomalous properties of water in a deeply supercooled state. However, there have been no direct experimental observations yet of LLT in bulk water in the so-called ‘no man's land’, where water exists only in the crystalline states. Recently, a novel experimental strategy to detect LLT in water has been employed using water–glycerol (W–G) mixtures, because glycerol can generate a strong hindrance for water crystallization. As a result, the observed first-order phase transition at a concentration of glycerol around cg ≈ 20 mol% was ascribed to the LLT. Here we show unambiguously that the first order phase transition in W–G mixtures is caused by the ice formation. We provide additional dielectric measurements, applying specific annealing temperature protocols in order to reinforce this conclusion. We also provide an explanation, why such a phase transition occurs only in the narrow glycerol concentration range. These results clearly demonstrate the danger of analysis of phase-separating liquids to gain better insights into water dynamics. These liquids have complex phase behavior that is affected by temperature, phase stability and segregation, viscosity and nucleation, and finally by crystallization, that might lead to significant misinterpretations.

Graphical abstract: The puzzling first-order phase transition in water–glycerol mixtures

Back to tab navigation

Publication details

The article was received on 17 May 2015, accepted on 27 May 2015 and first published on 05 Jun 2015


Article type: Paper
DOI: 10.1039/C5CP02851E
Author version
available:
Download author version (PDF)
Phys. Chem. Chem. Phys., 2015,17, 18063-18071

  •   Request permissions

    The puzzling first-order phase transition in water–glycerol mixtures

    I. Popov, A. Greenbaum (Gutina), A. P. Sokolov and Y. Feldman, Phys. Chem. Chem. Phys., 2015, 17, 18063
    DOI: 10.1039/C5CP02851E

Search articles by author

Spotlight

Advertisements