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conferenceseries
.com
Volume 7
Biosensors Journal
ISSN: 2090-4967
Electrochemistry 2018
June 11-12, 2018
June 11-12, 2018 | Rome, Italy
4
th
International Conference on
Electrochemistry
Equilibrium electro-osmotic instability in concentration polarization at a perfectly charge-selective
interface
Isaak Rubinstein
Ben-Gurion University of the Negev, Israel
E
quilibrium electroosmotic instability in concentration polarization at a perfectly charge-selective solid, such as ion-
exchange membrane or metal electrode, previously deemed impossible, is possible if one takes into account the finite
electrical conductivity of the solid. A simple model for electro-convective diffusion of ions in the depleted diffusion layer
predicts a supercritical transition to instability in the vicinity of the limiting current, as opposed to the subcritical transition
for the previously studied non-equilibrium instability related to the extended space charge. The linear stability analysis in this
model yields the division of the parameter space into domains in which each instability mechanism with its characteristic
signatures dominates. Identification of the particular instability mechanism for a given system requires a detailed experimental
study of the vicinity of the instability threshold in terms of both the voltage versus current dependence and flow visualization.
robinst@bgu.ac.ilBiosens J 2018, Volume 7
DOI: 10.4172/2090-4967-C1-003