Free energy of formation of small ice nuclei near the Widom line in simulations of supercooled water

  • Connor R. C. Buhariwalla
  • Richard K. Bowles
  • Ivan Saika-Voivod
  • Francesco Sciortino
  • Peter H. Poole
Regular Article

DOI: 10.1140/epje/i2015-15039-x

Cite this article as:
Buhariwalla, C.R.C., Bowles, R.K., Saika-Voivod, I. et al. Eur. Phys. J. E (2015) 38: 39. doi:10.1140/epje/i2015-15039-x

Abstract

The ST2 interaction potential has been used in a large number of simulation studies to explore the possibility of a liquid-liquid phase transition (LLPT) in supercooled water. Using umbrella sampling Monte Carlo simulations of ST2 water, we evaluate the free energy of formation of small ice nuclei in the supercooled liquid in the vicinity of the Widom line, the region above the critical temperature of the LLPT where a number of thermodynamic anomalies occur. Our results show that in this region there is a substantial free-energy cost for the formation of small ice nuclei, demonstrating that the thermodynamic anomalies associated with the Widom line in ST2 water occur in a well-defined metastable liquid phase. On passing through the Widom line, we identify changes in the free energy to form small ice nuclei that illustrate how the thermodynamic anomalies associated with the LLPT may influence the ice nucleation process.

Graphical abstract

Keywords

Flowing Matter: Liquids and Complex Fluids 

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Connor R. C. Buhariwalla
    • 1
  • Richard K. Bowles
    • 2
  • Ivan Saika-Voivod
    • 3
  • Francesco Sciortino
    • 4
  • Peter H. Poole
    • 1
  1. 1.Department of PhysicsSt. Francis Xavier UniversityAntigonishCanada
  2. 2.Department of ChemistryUniversity of SaskatchewanSaskatoonCanada
  3. 3.Department of Physics and Physical OceanographyMemorial University of NewfoundlandNewfoundlandCanada
  4. 4.Dipartimento di FisicaUniversità di Roma “La Sapienza”RomaItaly

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