Abstract
It is shown theoretically that the occurrence of limiting currents at micro-/nano-interfaces critically depends on the ratio of nano-channel height (nano-pore size) and the Debye screening length. If this ratio is sufficiently large (>ca.6 for slit-like nano-channels, for example), the limiting-current phenomenon is suppressed due to the electroosmotic transfer of salt toward the polarized micro-/nano-interface. Therefore, not too narrow nano-channels effectively behave like micro-channels in the limiting-current terms. It is suggested that this qualitative change in the behavior can be used as a signature of “genuine” nano-channels. It is also shown that some recent experimental findings on the concentration polarization of joined micro-/nano-fluidic systems can be explained by using this criterion.
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