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Using molecular dynamics simulations we study the dynamics of a water-likeTIP5P model of water in hydrophilic and hydrophobic confinement. We find thatin case of extreme nanocofinement such that there is only one molecular layerof water between the confinement surface, the dynamics of water remainsArrhenius with a very high activation energy up to high temperatures. In caseof polar (hydrophilic) confinement, The intermediate time scale dynamics ofwater is drastically modified presumably due to the transient coupling ofdipoles with the effective electric field due to the surface charges.Specifically, we find that in the presence of the polar surfaces, the dynamicsof monolayer water shows anomalous region -- namely the lateral mean squaredisplacement displays a distinct superdiffusive intermediate time scalebehavior in addition to ballistic and diffusive regimes. We explain thesefinding by proposing a simple model. Furthermore, we find that confinement andthe surface polarity changes the vibrational density of states specifically wesee the enhancement of the low frequency collective modes in confinementcompared to bulk water. Finally, we find that the length scale oftranslational-orientational coupling increases with the strength of thepolarity of the surface.

Dynamics of 2D Monolayer Confined Water in Hydrophobic and Charged Environments