A Surface Charge Dependent Model for Electrical Conductance of Nanochannels

Nanochannel electrical conductance measurements arecommonly performed to characterize nanofluidicdevices. Theoretical analysis and experimentalinvestigations imply that the nanochannel conductancedoes not follow the macro-scale models. It is generallyaccepted that the conductance of nanochannels deviatesfrom the bulk and remains constant at lowconcentrations. In this work, we present an improvedmodel for the nanochannel conductance that takes intoaccount the surface chemistry of the nanochannel wall.Our model has the advantage of simplicity, since itmodels the electrical conductance using a simplerapproach instead of the complicated solution ofgoverning partial differential equations. In our model,the nanochannel conductance is no longer constant atlow ionic concentrations. The model predictions wereconfronted to experimental measurements and presenteda remarkable consistence with the experiments.

کلیدواژه ها:

Nanofluidic ، Electrical conductance