Electric-double-layer potential distribution in multiple-layer immiscible electrolytes

Siddhartha Das, Steffen Hardt

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)
106 Downloads (Pure)

Abstract

In this Brief Report, we calculate the electric-double-layer (EDL) electrostatic potential in a system of several layers of immiscible electrolytes. Verwey-Niessen theory predicts that at the interface between two immiscible electrolytes back-to-back EDLs are formed. The present analysis extends this idea to the case where the immiscible liquids are contained inside a domain with given electrostatic potentials at its boundaries, where the thickness of the individual liquid layer can be comparable to the EDL thickness. Such a system gives rise to a situation where the overall EDL electrostatic potential in the system is dictated by the competitive influences of the boundary-induced effects and the effects induced by the jump in the ion-solvent interaction potential at the liquid-liquid interfaces. Invoking Debye-Hückel linearization, we derive an analytical result for the EDL electrostatic potential for two immiscible electrolyte layers, and extend it for a general system of N such immiscible electrolyte layers. We demonstrate that, depending upon the nature of the interfacial ion-solvent interaction potential jump, the overall EDL potential may manifest a strong influence of the boundary conditions or may invert the influence of the boundary conditions. Effects such as a variation of the ratio of the permittivity or the thickness of the liquids also dictate the overall potential profiles
Original languageEnglish
Article number022502
Number of pages5
JournalPhysical review E: Statistical, nonlinear, and soft matter physics
Volume84
Issue number2
DOIs
Publication statusPublished - 2011

Keywords

  • IR-78897
  • METIS-278500

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