title: Dielectric response of the water hydration layer around spherical solutes.
abstract: We calculate the local dielectric function ɛ(r) inside the hydration layer around a spherical solute (i) from molecular dynamics simulations including explicit solutes and (ii) theoretically using the nonlocal dielectric function of bulk water which includes the radial electric field, but not the explicit solute. The observed agreement between the two concepts shows that while ɛ(r) is strongly different from bulk, this difference is not due to restructuring of the hydrogen bond network but is mostly a consequence of the field geometry. The dielectric response differs for anions and cations, yielding a natural explanation for the well-known charge asymmetry of ionic solvation in agreement with experimental data.
authors.affiliation: Biofluid Simulation and Modeling, Department of Physics, University of Bayreuth, 95440 Bayreuth, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Schaaf
authors.affiliation: Biofluid Simulation and Modeling, Department of Physics, University of Bayreuth, 95440 Bayreuth, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Gekle
mesh_terms: D005583:Fourier Analysis; D006860:Hydrogen Bonding; D007477:Ions / Q000737:chemistry; D016014:Linear Models; D056004:Molecular Dynamics Simulation; D012996:Solutions; D012997:Solvents / Q000737:chemistry; D055672:Static Electricity; D014867:Water / Q000737:chemistry*
chemical_list: D007477:Ions; D012996:Solutions; D012997:Solvents; D014867:Water