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Ion transport in biological and synthetic nanochannels is characterized bysuch phenomena as ion current fluctuations, rectification, and pumping.Recently, it has been shown that the nanofabricated synthetic pores could beconsidered as analogous to biological channels with respect to their transportcharacteristics \cite{Apel, Siwy}. The ion current rectification is analyzed.Ion transport through cylindrical nanopores is described by the Smoluchowskiequation. The model is considering the symmetric nanopore with asymmetriccharge distribution. In this model, the current rectification in asymmetricallycharged nanochannels shows a diode-like shape of $I-V$ characteristic. It isshown that this feature may be induced by the coupling between the degree ofasymmetry and the depth of internal electric potential well. The role ofconcentration gradient is discussed

How the asymmetry of internal potential influences the shape of I-V characteristic of nanochannels