Stanford University, Stanford, California 94305, USA.
Anal Chem. 2010 Apr 15;82(8):3114-7. doi: 10.1021/ac100432q.
We extend the analytical theory of propagating concentration polarization (CP) to describe and compare the effects of constant-voltage versus constant-current conditions on the transient development of CP enrichment and depletion zones. We support our analysis with computational and experimental results. We find that at constant voltage, enrichment and depletion regions spread as t(1/2) as opposed to the previously observed t(1) scaling for constant current conditions. At low, constant voltages, the growth and propagation of CP zones can easily be misinterpreted as nonpropagating behavior.
我们将传播浓度极化 (CP) 的分析理论扩展到描述和比较恒压与恒流条件对 CP 富集和耗尽区瞬态发展的影响。我们用计算和实验结果支持我们的分析。我们发现，在恒压下，富集区和耗尽区的扩展速度为 t(1/2)，而不是之前观察到的恒流条件下的 t(1) 标度。在低恒压下，CP 区的生长和传播很容易被误解为非传播行为。
