Ionic Capillary Evaporation in Weakly Charged Nanopores
Sahin Buyukdagli, Manoel Manghi, and John Palmeri
TL;DR
This paper uses a variational field theory to reveal a first-order ionic liquid-vapor pseudo-phase transition in weakly charged nanopores, explaining rapid conductivity switching observed experimentally.
Contribution
It introduces a theoretical framework showing a pseudo-phase transition in electrolytes within nanopores, highlighting the role of ionic correlations and dielectric effects.
Findings
Identification of a first-order ionic liquid-vapor pseudo-phase transition
Survival of the pseudotransition in weakly charged nanopores
Potential explanation for rapid nanopore conductivity switching
Abstract
Using a variational field theory, we show that an electrolyte confined to a neutral cylindrical nanopore traversing a low dielectric membrane exhibits a first-order ionic liquid-vapor pseudo-phase-transition from an ionic-penetration "liquid" phase to an ionic-exclusion "vapor" phase, controlled by nanopore-modified ionic correlations and dielectric repulsion. For weakly charged nanopores, this pseudotransition survives and may shed light on the mechanism behind the rapid switching of nanopore conductivity observed in experiments.
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