Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC24: Electrokinetic Transport III
12:50 PM–3:00 PM,
Tuesday, November 21, 2023
Room: 150A
Chair: Ankur Gupta, University of Colorado, Boulder
Abstract: ZC24.00004 : Asymmetric rectified electric and concentration fields in multicomponent electrolytes with surface reactions*
1:29 PM–1:42 PM
Presenter:
Nathan Jarvey
(University of Colorado, Boulder)
Authors:
Nathan Jarvey
(University of Colorado, Boulder)
Filipe H Henrique
(University of Colorado, Boulder)
Ankur Gupta
(University of Colorado, Boulder)
Asymmetric rectified electric fields (AREFs) are time-averaged residual electric fields that form upon the application of an AC field to a two-electrode cell. AREFs have been used to explain discrepancies between experimental and theoretical results of directed colloidal assembly. Current understanding in the literature states that AREFs can arise only due to asymmetric ion diffusivities. While recent experimental literature has employed electrochemical reactions to drive directed colloidal assembly, the effects of surface electrochemical reactions on AREF theory remain unexplored.
Here, we solve the Poisson-Nernst-Planck equations for multicomponent electrolytes with surface reactions in the limit of low applied potentials. Crucially, we find that in addition to diffusivity asymmetry, surface reactions can also give rise to the formation of AREFs. Furthermore, we discover that the strength of AREFs induced by electrochemical reactions can be higher than that resulting from diffusivity asymmetry alone. Additionally, we report the emergence of asymmetric rectified concentration fields, which can lead to the directed assembly of colloids via diffusiophoresis, in agreement with the recently proposed mechanism of electrodiffusiophoresis in the literature.
*A.G. thanks the National Science Foundation (CBET - 2238412) CAREER award for financial support and the donors of the American Chemical Society Petroleum Research Fund for partial support of this research. N. J. thanks the ARCS Foundation Scholarship and GAANN fellowship in Soft Materials for financial support. F. H. acknowledges the Ryland Family Graduate Fellowship for financial assistance.
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