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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.