Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Charged Soft Matter II
CPP 51.6: Vortrag
Donnerstag, 3. April 2014, 16:15–16:30, ZEU 118
The Hubbard-Onsager dielectric decrement — •Marcello Sega1, Sofia Kantorovich1, Christian Holm2, and Axel Arnold2 — 1University of Vienna, Austria — 2Institute for Computational Physics, Universität Stuttgart, Allmandring 3 70569 Stuttgart Germany
In 1977, Hubbard and Onsager predicted that upon addition of salt to water, the latter should be partly depolarized by an external electric field, resulting in a decrement of the static dielectric permittivity, even though the effect is purely kinetic. This kinetic decrement has never been observed directly, because of the presence of dielectric saturation. Here, we use out-of-equilibrium molecular dynamics simulations to show directly the existence of the kinetic decrement. We show that the kinetic decrement can account to about 10% of the static dielectric permittivity in a NaCl aqueous solution. We compare the simulation results with available theoretical approaches.