Volume 246, 2023

Ionic current driven by a viscosity gradient

Abstract

Gradients of voltage, pressure, temperature, and salinity can transport objects in micro- and nanofluidic systems by well-known mechanisms. This paper explores the dynamics of particles in a viscosity gradient with numerical simulations. The different stochastic rules used to integrate the random motion of Brownian particles affect the steady-state distribution of particles in a diffusivity gradient. Importantly, the simulations illuminate the important role that the boundary conditions play, disallowing a steady-state flux when the boundary conditions mimic those of a closed container, but allowing flux when they mimic electrodes. These results provide an interpretation for measurements of a steady ionic current flowing between electrodes separated by a nanofluidic channel with a liquid viscosity gradient.

Graphical abstract: Ionic current driven by a viscosity gradient

Associated articles

Article information

Article type
Paper
Submitted
27 2 2023
Accepted
18 5 2023
First published
19 5 2023

Faraday Discuss., 2023,246, 47-59

Author version available

Ionic current driven by a viscosity gradient

B. Wiener and D. Stein, Faraday Discuss., 2023, 246, 47 DOI: 10.1039/D3FD00053B

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