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Issue 8, 2016
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Equation of state for water and its line of density maxima down to −120 MPa

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Abstract

As water is involved in countless natural and industrial processes, its thermodynamic properties have been measured in a wide temperature and pressure range. Data on supercooled water are also available down to −73 °C and up to 400 MPa. In contrast, data at negative pressures are extremely scarce. Here we provide an experimental equation of state for water down to −120 MPa. In particular, we obtain the line of density maxima (LDM) of water down to a pressure six times more negative than previously available. As temperature increases from 4 up to 18 °C, the pressure PLDM(T) along the LDM decreases monotonically from 0 down to −120 MPa, while the slope dPLDM/dT becomes more negative. The experimental results are compared with molecular dynamic simulations of TIP4P/2005 water and a two-state model. We also discuss the possibility to observe extrema in compressibility and heat capacity at negative pressures, features that have remained elusive at positive pressures.

Graphical abstract: Equation of state for water and its line of density maxima down to −120 MPa

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Publication details

The article was received on 08 Dec 2015, accepted on 23 Jan 2016 and first published on 26 Jan 2016


Article type: Communication
DOI: 10.1039/C5CP07580G
Citation: Phys. Chem. Chem. Phys., 2016,18, 5896-5900
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    Equation of state for water and its line of density maxima down to −120 MPa

    G. Pallares, M. A. Gonzalez, J. L. F. Abascal, C. Valeriani and F. Caupin, Phys. Chem. Chem. Phys., 2016, 18, 5896
    DOI: 10.1039/C5CP07580G

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