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  Liquid polyamorphism: Possible relation to the anomalous behaviour of water

Stanley, H. E., Kumar, P., Franzese, G., Xu, L., Yan, Z., Mazza, M. G., et al. (2008). Liquid polyamorphism: Possible relation to the anomalous behaviour of water. European Physics Journal Special Topics, 161(1), 1-17. doi:10.1140/epjst/e2008-00746-3.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-2F9B-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-2F9C-9
Genre: Journal Article

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 Creators:
Stanley, H. E., Author
Kumar, P., Author
Franzese, G., Author
Xu, L., Author
Yan, Z., Author
Mazza, Marco G.1, Author              
Buldyrev, S. V., Author
Chen, S.-H., Author
Mallamace, F., Author
Affiliations:
1Group Non-equilibrium soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063308              

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 Abstract: We present evidence from experiments and computer simulations supporting the hypothesis that water displays polyamorphism, i.e., water separates into two distinct liquid phases. This concept of a new liquid-liquid phase transition is finding application to other liquids as well as water, such as silicon and silica. Specifically, we investigate, the relation between changes in dynamic and thermodynamic anomalies arising from the presence of the liquid-liquid critical point in (i) Two models of water, TIP5P and ST2, which display a first order liquid-liquid phase transition at low temperatures; (ii) the Jagla model, a spherically symmetric two-scale potential known to possess a liquid-liquid critical point, in which the competition between two liquid structures is generated by repulsive and attractive ramp interactions; and (iii) A Hamiltonian model of water where the idea of two length/energy scales is built in. This model also displays a first order liquid-liquid phase transition at low temperatures besides the first order liquid-gas phase transition at high temperatures. We find a correlation between the dynamic fragility crossover and the locus of specific heat maxima CmaxP (“Widom line”) emanating from the critical point. Our findings are consistent with a possible relation between the previously hypothesised liquid-liquid phase transition and the transition in the dynamics recently observed in neutron scattering experiments on confined water. More generally, we argue that this connection between CmaxP and the dynamic crossover is not limited to the case of water, a hydrogen bonded network liquid, but is a more general feature of crossing the Widom line, an extension of the first-order coexistence line in the supercritical region.

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Language(s): eng - English
 Dates: 2008-07
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1140/epjst/e2008-00746-3
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Title: European Physics Journal Special Topics
Source Genre: Journal
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Publ. Info: Springer
Pages: - Volume / Issue: 161 (1) Sequence Number: - Start / End Page: 1 - 17 Identifier: -