Charged Polymers Transport under Applied Electric Fields in Periodic Channels

Materials

Sorin Nedelcu¹ 

[1] Leibniz-Institut für Polymerforschung Dresden, Hohe Str. 6, Dresden 01069, Germany

关键词: molecular dynamics;    polyelectrolytes;    confinement;   

DOI  :  10.3390/ma6073007

来源: mdpi

【 摘 要 】

By molecular dynamics simulations, we investigated the transport of charged polymers in applied electric fields in confining environments, which were straight cylinders of uniform or non-uniform diameter. In the simulations, the solvent was modeled explicitly and, also, the counterions and coions of added salt. The electrophoretic velocities of charged chains in relation to electrolyte friction, hydrodynamic effects due to the solvent, and surface friction were calculated. We found that the velocities were higher if counterions were moved away from the polymeric domain, which led to a decrease in hydrodynamic friction. The topology of the surface played a key role in retarding the motion of the polyelectrolyte and, even more so, in the presence of transverse electric fields. The present study showed that a possible way of improving separation resolution is by controlling the motion of counterions or electrolyte friction effects.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.