Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 285, Issue -, Pages 727-739Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2019.04.090
Keywords
Supercooled water; Confinement; Percolation; Correlation length; Response functions
Funding
- Austrian Science Fund (FWF) [M 2150-N36]
- European Commission through the Marie Sklodowska-Curie Fellowship [748170 ProFrost]
- ICREA Academia prize
- Generalitat de Catalunya
- Spanish MICINN [FIS2015-66879-C2-2-P]
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Numerical simulations for a number of water models have supported the possibility of a metastable liquid liquid critical point (LLCP) in the deep supercooled region. Here we consider a theoretical model for a supercooled liquid water monolayer and its mathematical mapping onto a percolation problem. The mapping allows us to identify the finite-size clusters at any state-point, and the infinite cluster at the critical point, with the regions of correlated hydrogen bonds (HBs). We show that the percolation line coincides with the first-order liquid-liquid phase transition ending at the LLCP. At pressures below the LLCP, the percolation line corresponds to the strong maxima of the thermodynamic response functions and to the locus of maximum correlation length (Widom line). At higher pressures, we find a percolation transition with a positive slope and we discuss its possible relation with the thermodynamics. (C) 2019 Elsevier B.V. All rights reserved.
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