Grafted polyelectrolyte in strong electric field under load: Field-regulated force and chain contraction
Department of Mathematics, University of Leicester - Leicester LE1 7RH, UK, EU
2 Max Planck Institute of Colloids and Interfaces - Science Park Golm, D-14424 Potsdam, Germany, EU
Accepted: 30 November 2011
The response of grafted polyelectrolytes to electrostatic field that favors adsorption is studied theoretically and by means of molecular dynamics (MD). Applying to the free chain end a constant force which counteracts adsorption, we analyze the size of the desorbed part as a function of force and electric field. Simulations with different loads, corresponding to linear, nonlinear and Hertzian springs, applied to the free end have been also performed to explore the generation of mechanical force by electric field. The MD results are in good agreement with the predictions of theory.
PACS: 82.35.Rs – Polyelectrolytes / 82.35.Gh – Polymers on surfaces; adhesion / 85.85.+j – Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
© EPLA, 2012