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Electrophoretic mobility reversal of polyampholytes induced by strong electric fields or confinement.

Authors
  • Hickey, Owen A
  • Holm, Christian
Type
Published Article
Journal
The Journal of Chemical Physics
Publisher
American Institute of Physics
Publication Date
May 21, 2013
Volume
138
Issue
19
Pages
194905–194905
Identifiers
DOI: 10.1063/1.4804620
PMID: 23697439
Source
Medline
License
Unknown

Abstract

We investigate the mobility of polyampholytes consisting of both negatively and positively charged sections. The simulations are carried out using molecular dynamics simulations with electrohydrodynamical effects taken into account via a simple coupling scheme to a lattice-Boltzmann fluid. Our results show a previously predicted mobility reversal of the polyampholytes as the applied electric field is increased due to stretching of the polyampholytes. Further, we show that a similar mobility reversal can be induced due to confinement between parallel plates. At high electric field strengths, the polyampholytes' electrophoretic mobility is a non-monotonic function of the distance between the plates. These results help to clarify the role of deformation and confinement on the electrophoretic mobility of polyampholytes.

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