Dielectric constant of ionic solutions: A field-theory approach

Amir Levy, David Andelman, Henri Orland

Research output: Contribution to journalArticlepeer-review

Abstract

We study the variation of the dielectric response of a dielectric liquid (e.g. water) when a salt is added to the solution. Employing field-theoretical methods, we expand the Gibbs free energy to first order in a loop expansion and calculate self-consistently the dielectric constant. We predict analytically the dielectric decrement which depends on the ionic strength in a complex way. Furthermore, a qualitative description of the hydration shell is found and is characterized by a single length scale. Our prediction fits rather well a large range of concentrations for different salts using only one fit parameter related to the size of ions and dipoles.

Original languageEnglish
Article number227801
JournalPhysical Review Letters
Volume108
Issue number22
DOIs
StatePublished - 29 May 2012

Fingerprint

Dive into the research topics of 'Dielectric constant of ionic solutions: A field-theory approach'. Together they form a unique fingerprint.

Cite this