Effect of Electro-Diffusion Current Flow on Electrostatic Screening in Aqueous Pores

Details Effect of Electro-Diffusion Current Flow on Electrostatic Screening in Aqueous Pores Effect of Electro-Diffusion Current Flow on Electrostatic Screening in Aqueous Pores

2007-12-14

arxiv.org/abs/0712.2478v1

Physics

Biological Physics

Scientific paper

10.1063/1.2906327

A numerical study within the framework of the Poisson-Nernst-Planck equations is conducted to investigate electrostatic screening of charged bio-molecules within synthetic pores having diameters of at least 10 Debye lengths. We show that with external biases, the bio-molecule charge is only partially screened due to the presence of electrodiffusion current flow. This is considerably different from the equilibrium Debye-Huckel screening behavior and will result in long-range electrostatic interactions. The potential application to direct bio-molecule charge sensing is also discussed.

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