@misc{10481/91123,
year = {2023},
month = {12},
url = {https://hdl.handle.net/10481/91123},
abstract = {An investigation on the phenomenon of concentration polarization (CP) in conducting porous particles is presented
in this work, considering both bare and polyelectrolyte-coated particles. The conducting nature of the
porous structure brings about the induction of a surface (and hence volume) charge distribution by the applied
external field. The polymer charge (with its counterions from solution) is superimposed on this field-induced
component. From the solution of Poisson’s equation, the concentration and potential profiles are evaluated,
and from them, the concentration polarization can be calculated. The results are presented as concentration
perturbation as a function of time after application of the field, both for bare and coated particles. Experiments
are also performed aimed at measuring the CP using a solution of fluorescent dye (rhodamine B). From the
increase or decrease of fluorescence, the concentration perturbations are observed around the particle. Importantly,
depletion of concentration is observed on both sides of the particle when this is bare. In contrast, if the
particles are coated, the classical pattern of a pole of increased concentration and an opposite one of decreased
concentration is found. Dielectric dispersion experiments in suspensions of bare and brush-coated particles
confirm this fact.},
organization = {FEDER/Junta de Andalucía  P20_00233, A-FQM492-UGR20},
organization = {TED2021-131855BI00/AEI/10.13039/501100011033/Unión Europea Next Generation EU/PRTR},
publisher = {Elsevier},
keywords = {Activated carbon},
keywords = {Capacitive deionization},
keywords = {Concentration polarization},
keywords = {Polyelectrolyte coating},
keywords = {Conducting porous particles},
keywords = {CDI},
title = {Concentration polarization around polyelectrolyte-coated electrodes. Model and observations},
doi = {10.1016/j.molliq.2023.123757},
author = {Lirio Piñar, Juan Antonio and Orozco Barrera, Sergio and Delgado Mora, Ángel Vicente and Ahualli Yapur, Silvia Alejandra},
}