Rectification of Ion Current in Nanopipettes by External Substrates
نویسندگان
چکیده
منابع مشابه
Studies of ionic current rectification using polyethyleneimines coated glass nanopipettes.
The modification of glass nanopipettes with polyethyleneimines (PEIs) has been successfully achieved by a relatively simple method, and the smallest tip opening is around 3 nm. Thus, in a much wider range of glass pipettes with radii from several nanometers to a few micrometers, the ion current rectification (ICR) phenomenon has been observed. The influences of different KCl concentrations, pH ...
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Previous reports on Poisson-Nernst-Planck (PNP) simulations of solid-state nanopores have focused on steady state behaviour under simplified boundary conditions. These are Neumann boundary conditions for the voltage at the pore walls, and in some cases also Donnan equilibrium boundary conditions for concentrations and voltages at both entrances of the nanopore. In this paper, we report time-dep...
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proving the validity of the present numerical approach. The results were also compared to the FEM simulations made by White et al. The ion current rectification in the pore of 10 μm length and half-cone angle of 12°, filled with 1 mM KCl solution was simulated. In this case the rectification ratio r(E) 35 is 1.39, while White et al report 1.38. The tiny difference in the obtained result is prob...
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There is clear evidence that the net magnitude of negative charge at the intracellular end of inwardly rectifying potassium channels helps to generate an asymmetry in the magnitude of the current that will pass in each direction. However, a complete understanding of the physical mechanism that links these charges to current rectification has yet to be obtained. Using Brownian dynamics, we compa...
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ژورنال
عنوان ژورنال: ACS Nano
سال: 2013
ISSN: 1936-0851,1936-086X
DOI: 10.1021/nn4050485