Fields generated by a rod adsorbed on an oppositely charged surface: The effect of surface ion mobility and dimensionality on screening
Materials Research Lab, University of California Santa Barbara - CA 93106, USA
2 Department of Chemical Engineering University of Delaware Newark - DE 19716, USA
Accepted: 10 September 1998
Motivated by recent interest in the formation of DNA-surface complexes we study the effects of surface and counter-ion charges on the electrostatic fields of charged rod-like macromolecules adsorbed on oppositely charged surfaces. We find that the screening of the rod's fields, due to counter-ions and mobile surface charges, can be either exponential (leading to a finite-range interaction) in the case of weak charging or just algebraic in the case of strong surface charging. We test our analytical results with Monte Carlo simulations.
PACS: 87.15.By – Structure, bonding, conformation, configuration, and isomerism of biomolecules
© EDP Sciences, 1998