Abstract
The passage of an electric current through a permselective medium
(membranes/nanochannels) under an applied electric field is
characterized by the formation of ionic concentration gradients which
result in regions of depleted and enriched ionic concentration at
opposite ends of the medium, i.e. concentration polarization (CP). In
this work, we study the time-transient behavior of the concentration and
electric potential distributions in a realistic two dimensional and
three layered system (i.e. microchannel-permselective
medium-microchannel device). We provide an analytical solution for the
concentration under the simplifying assumptions of
local-electroneutrality, ideal permselectivity and negligible convection
while the electric potential is solved numerically. It is shown that
time transient effects occur over the diffusive time scale until
steady-state is achieved. The numerical steady state solution is
compared with previous analytical results and good quantitative behavior
is observed.
Original language | English GB |
---|---|
Article number | id. Q34.001 |
Journal | Bulletin of the American Physical Society |
Volume | 60 |
Issue number | 1 |
State | Published - 2015 |
Externally published | Yes |
Event | APS March Meeting 2015 - San Antonio, Texas, United States Duration: 2 Mar 2015 → 6 Mar 2015 |