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Surface-charge effects on the movement of a polyelectrolyte through a solid-state nanopore

Published online by Cambridge University Press:  05 July 2012

K. Ding ,
Q. Yan ,
N. Wang ,
F. Wu  and
Z. Wu
K. Ding*
Affiliation:
College of Life sciences and Biotechnology, School of Science, Beijing Jiaotong University, Beijing 100044, P.R. China
Q. Yan
Affiliation:
College of Life sciences and Biotechnology, School of Science, Beijing Jiaotong University, Beijing 100044, P.R. China
N. Wang
Affiliation:
College of Life sciences and Biotechnology, School of Science, Beijing Jiaotong University, Beijing 100044, P.R. China
F. Wu
Affiliation:
College of Life sciences and Biotechnology, School of Science, Beijing Jiaotong University, Beijing 100044, P.R. China
Z. Wu
Affiliation:
University of Science and Technology of China, Hefei 230026, P.R. China
*
ae-mail: [email protected]
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Abstract

This contribution presents an electro-hydrodynamic method for establishing the relationship between the motion of a polyelectrolyte through a solid-state nanopore and the surface-charge density of the nanopore. For a polyelectrolyte driven by an external electric field, our numerical calculations show that the dynamics of polyelectrolyte translocation through a nanopore are mediated by the charge density σ of the nanopore surface. The result implies that the charge density can be an effective way to regulate the polyelectrolyte translocation. Moreover, for the first time results indicate that a threaded polyelectrolyte may be retracted from a nanopore, and that a nanometer-scale channel can act as nanopore tweezers, in the same way as optical or magnetic tweezers allow manipulation of single molecules.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 58 , Issue 3 , June 2012 , 31201
Copyright
© EDP Sciences, 2012

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