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Issue 7, 2014
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Transition from non-monotonic to monotonic electrical diffuse layers: impact of confinement on ionic liquids

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Abstract

Intense investigations of room temperature ionic liquids have revealed not only their advantages in a wide range of technological applications but also triggered scientific debates about charge distribution properties within the bulk and near the solid–liquid interfaces. While many observations report on an alternating charge layering (i.e., spatially extended decaying charge density oscillations), there are recent conjectures that ionic liquids bear similarity to dilute electrolytes. Using a modified Poisson–Nernst–Planck model for ionic liquids (after Bazant et al., Phys. Rev. Lett. 2011, 106, 046102), we show that both behaviors are fundamental properties of ionic liquids. The transition from the non-monotonic (oscillatory) to the monotonic structure of electrical diffuse layers appears to non-trivially depend on ionic density in the bulk, electrostatic correlation length, confinement and surface properties. Consequently, the results not only reconcile the empirical results but also provide a powerful methodology to gain insights into the nonlinear aspects of concentrated electrolytes.

Graphical abstract: Transition from non-monotonic to monotonic electrical diffuse layers: impact of confinement on ionic liquids

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Article information


Submitted
27 Nov 2013
Accepted
16 Dec 2013
First published
17 Jan 2014

Phys. Chem. Chem. Phys., 2014,16, 2836-2841
Article type
Communication

Transition from non-monotonic to monotonic electrical diffuse layers: impact of confinement on ionic liquids

A. Yochelis, Phys. Chem. Chem. Phys., 2014, 16, 2836
DOI: 10.1039/C3CP55002H

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