Gate manipulation of ionic conductance in a nanochannel with overlapped electric double layers

To improve the development of gated nanofluidic devices for emerging applications, analytical expressions are derived to investigate the gate manipulation of surface charge property and ionic conductance in a pH-regulated nanochannel with overlapped electric double layers (EDLs). Results show that the EDL overlap effect is relatively significant at low pH and salt concentration when a negative gate potential is applied. If pH is low, the EDL overlap effect on the field control of zeta potential of the nanochannel is remarkable at large positive gate voltage, while that effect on ionic conductance is significant at large negative gate voltage.