Effect of Salt Concentration on the Electrophoretic Speed of a Polyelectrolyte through a Nanopore

Details Effect of Salt Concentration on the Electrophoretic Speed of a Polyelectrolyte through a Nanopore Effect of Salt Concentration on the Electrophoretic Speed of a Polyelectrolyte through a Nanopore

2007-09-24

arxiv.org/abs/0709.3850v1

Physical Review Letters (2007), Volume 98, 238104

Physics

Chemical Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.98.238104

In a previous paper [S. Ghosal, Phys. Rev. E 74, 041901 (2006)] a hydrodynamic model for determining the electrophoretic speed of a polyelectrolyte through an axially symmetric slowly varying nanopore was presented in the limit of a vanishingly small Debye length. Here the case of a finite Debye layer thickness is considered while restricting the pore geometry to that of a cylinder of length much larger than the diameter. Further, the possibility of a uniform surface charge on the walls of the nanopore is taken into account. It is thereby shown that the calculated transit times are consistent with recent measurements in silicon nanopores.

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