Polarization Relaxation in an Ionic Liquid Confined between Electrified Walls

C. Pinilla, Mario Del Popolo, Jorge Kohanoff, Ruth M Lynden-Bell

Research output: Contribution to journalArticle

117 Citations (Scopus)

Abstract

The response of a room temperature molten salt to an external electric field when it is confined to a nanoslit is studied by molecular dynamics simulations. The fluid is confined between two parallel and oppositely charged walls, emulating two electrified solid-liquid interfaces. Attention is focused on structural, electrostatic, and dynamical properties, which are compared with those of the nonpolarized fluid. It is found that the relaxation of the electrostatic potential, after switching the electric field off, occurs in two stages. A first, subpicosecond process accounts for 80% of the decay and is followed by a second subdiffusive process with a time constant of 8 ps. Diffusion is not involved in the relaxation, which is mostly driven by small anion translations. The relaxation of the polarization in the confined system is discussed in terms of the spectrum of charge density fluctuations in the bulk.
Original languageEnglish
Pages (from-to)4877-4884
Number of pages8
JournalJournal of Physical Chemistry B
Volume111
Issue number18
DOIs
Publication statusPublished - 10 Jan 2007

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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