Conductance of ion channels and nanopores with charged walls: a toy model

Details Conductance of ion channels and nanopores with charged walls: a toy model Conductance of ion channels and nanopores with charged walls: a toy model

2005-05-19

arxiv.org/abs/cond-mat/0505490v3

Phys. Rev. Lett. 95, 148101 (2005)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures, typos eliminated, references added

Scientific paper

10.1103/PhysRevLett.95.148101

We consider ion transport through protein ion channels in lipid membranes and water-filled nanopores in silicon films. It is known that, due to the large ratio of dielectric constants of water and the surrounding material, an ion placed inside the channel faces a large electrostatic self-energy barrier. The barrier leads to an exponentially large resistance of the channel. We study reduction of the electrostatic barrier by immobile charges located on the internal walls of the channel. We show that the barrier practically vanishes already at relatively small concentration of wall charges.

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