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Title: | Critical behavior of a water monolayer under hydrophobic confinement |
Author: | Bianco, Valentino Franzese, Giancarlo |
Keywords: | Termodinàmica Transformacions de fase (Física estadística) Fenòmens crítics (Física) Thermodynamics Phase transformations (Statistical physics) Critical phenomena (Physics) |
Issue Date: | 4-Apr-2014 |
Publisher: | Nature Publishing Group |
Abstract: | The properties of water can have a strong dependence on the confinement. Here, we consider a water monolayer nanoconfined between hydrophobic parallel walls under conditions that prevent its crystallization. We investigate, by simulations of a many-body coarse-grained water model, how the properties of the liquid are affected by the confinement. We show, by studying the response functions and the correlation length and by performing finite-size scaling of the appropriate order parameter, that at low temperature the monolayer undergoes a liquid-liquid phase transition ending in a critical point in the universality class of the two-dimensional (2D) Ising model. Surprisingly, by reducing the linear size L of the walls, keeping the walls separation h constant, we find a 2D-3D crossover for the universality class of the liquid-liquid critical point for L/h=~50, i.e. for a monolayer thickness that is small compared to its extension. This result is drastically different from what is reported for simple liquids, where the crossover occurs for , and is consistent with experimental results and atomistic simulations. We shed light on these findings showing that they are a consequence of the strong cooperativity and the low coordination number of the hydrogen bond network that characterizes water. |
Note: | Reproducció del document publicat a: http://dx.doi.org/10.1038/srep04440 |
It is part of: | Scientific Reports, 2014, vol. 4, num. 4440, p. 1-10 |
URI: | http://hdl.handle.net/2445/65592 |
Related resource: | http://dx.doi.org/10.1038/srep04440 |
ISSN: | 2045-2322 |
Appears in Collections: | Articles publicats en revistes (Física de la Matèria Condensada) Publicacions de projectes de recerca finançats per la UE |
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