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Combining ab-initio and classical molecular dynamics simulations to unravel the structure of the 2D-HB-network at the air-water interface

Abstract : An extensive structural characterization of the 2D-HB-Network formed by water molecules at the air-water interface has been carried out by means of DFT-based and classical molecular dynamics simulations. SPC/E and SPC/Fw force fields commonly used for modelling liquid water are shown to correctly reproduce the 2D-HB-Network structure obtained from the reference ab-initio simulation. For both DFT-MD and classical MD representations, identical results have been obtained by increasing the size and time-scale of the simulations, starting from a simulation box of 256 water molecules in the liquid phase, simulated for 20 ps up to 25 ns. One pivotal result is that ∼90% of the water molecules in the interfacial layer are connected by a collective and extended net of HBs oriented parallel to the surface, and this 2D-HB-Network is built upon adjacent water rings mostly formed by 4, 5 or 6 water molecules. This finding in particular rationalizes previous non linear SFG spectroscopic results suggesting that liquid water at the interface with hydrophobic media could arrange in rings.
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https://hal-univ-evry.archives-ouvertes.fr/hal-02082460
Contributor : Sana Bougueroua <>
Submitted on : Thursday, March 28, 2019 - 11:47:36 AM
Last modification on : Tuesday, April 28, 2020 - 1:27:57 AM

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Alessandra Serva, Simone Pezzotti, Sana Bougueroua, Daria Ruth Galimberti, Marie-Pierre Gaigeot. Combining ab-initio and classical molecular dynamics simulations to unravel the structure of the 2D-HB-network at the air-water interface. Journal of Molecular Structure, Elsevier, 2018, 1165, pp.71-78. ⟨10.1016/j.molstruc.2018.03.074⟩. ⟨hal-02082460⟩

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