Show simple item record

dc.contributor.authorBuyukdagli, S.en_US
dc.date.accessioned2016-02-08T09:46:00Z
dc.date.available2016-02-08T09:46:00Z
dc.date.issued2015en_US
dc.identifier.urihttp://hdl.handle.net/11693/21414
dc.description.abstractWe investigate dielectric saturation and increment in polar liquids under external fields. We couple a previously introduced dipolar solvent model to a uniform electric field and derive the electrostatic kernel of interacting dipoles. This procedure allows an unambiguous definition of the liquid dielectric permittivity embodying non-linear dielectric response and correlation effects. We find that the presence of the external field results in a dielectric anisotropy characterized by a two-component dielectric permittivity tensor. The increase of the electric field amplifies the permittivity component parallel to the field direction, i.e. dielectric increment is observed along the field. However, the perpendicular component is lowered below the physiological permittivity εu ≈ 77, indicating dielectric saturation perpendicular to the field. By comparison with Molecular Dynamics simulations from the literature, we show that the mean-field level dielectric response theory underestimates dielectric saturation. The inclusion of dipolar correlations at the weak-coupling level intensify the mean-field level dielectric saturation and improves the agreement with simulation data at weak electric fields. The correlation-corrected theory predicts as well the presence of a metastable configuration corresponding to the antiparallel alignment of dipoles with the field. This prediction can be verified by solvent-explicit simulations where solvent molecules are expected to be trapped transiently in this metastable state.en_US
dc.language.isoEnglishen_US
dc.source.titleJournal of Statistical Mechanics : Theory and Experimenten_US
dc.relation.isversionofhttp://dx.doi.org/10.1088/1742-5468/2015/08/P08022en_US
dc.subjectCharged fluids (theory)en_US
dc.subjectElectrolyte solutionsen_US
dc.subjectIonic liquidsen_US
dc.subjectLiquid metals and charged fluids (theory)en_US
dc.titleDielectric anisotropy in polar solvents under external fieldsen_US
dc.typeArticleen_US
dc.departmentDepartment of Physicsen_US
dc.citation.spage1en_US
dc.citation.epage15en_US
dc.citation.volumeNumber15en_US
dc.identifier.doi10.1088/1742-5468/2015/08/P08022en_US
dc.publisherInstitute of Physics Publishingen_US
dc.identifier.eissn1742-5468


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record