Confinement-Induced Enhancement of Parallel Dielectric Permittivity: Super Permittivity under Extreme Confinement

Mohammad H. Motevaselian, Narayana R. Aluru

Research output: Contribution to journalArticlepeer-review


Enhancement of parallel (x-y plane) dielectric permittivity of confined fluids has been shown previously. However, a theoretical model that explains this enhancement is lacking thus far. In this study, using statistical-mechanical theories and molecular dynamics simulations, we show an explicit relation between the parallel dielectric permittivity, density variations, and dipolar correlations for protic and aprotic fluids confined in slit-like channels. We analyze the importance of dipolar correlations on enhancement of parallel dielectric permittivity inside large channels and extreme confinements. In large channels, beyond the interfacial region, dipolar correlations exhibit bulk-like behavior. Under extreme confinement, the correlations become stronger to the extent that they give rise to a giant increase in the parallel dielectric permittivity. This sudden increase in dielectric permittivity can be a signature of a liquid transition into higher-ordered structures and has important consequences for understanding ion transport, molecular dissociation, and chemical reactions inside nanoconfined environments.

Original languageEnglish (US)
Pages (from-to)10532-10537
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number24
StatePublished - Dec 17 2020

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry


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