Dynamics of water at the nanoscale hydrophobic confinement.

We investigate the effect of solute surface topology created by considering various intermolecular separations of the hydrophobic, paraffinlike plates on the dynamics of water confined between two such plates. The solute plates are made up of 5 n-C(18)H(38) molecules arranged in parallel in such a way that all the carbon atoms of the paraffin molecule are lying on the same plane. Results are obtained from extensive molecular dynamics simulations of aqueous solutions of paraffinlike plates in the isothermal-isobaric ensemble. A strong dependence of the translational as well as vibrational dynamics of the confined water molecules on surface topology (intermolecular distance within the paraffinlike plate) has been observed. Analysis of mean squared displacement reveals anomalous nonlinear behavior of the water molecules in the nanoconfined environment.