Enhanced counterion localization induced by surface charge modulation
Departments of Materials and Interfaces, Weizmann Institute - 76100
2 Department of Physics and Astronomy, University of Pennsylvania Philadelphia, PA 19104, USA
3 Department of Physics and Materials Research Laboratory, University of California Santa Barbara, CA 93106-9530, USA
Accepted: 7 March 2002
Using both small-amplitude and singular-perturbation theories we predict theoretically that the presence of surface charge modulations gives rise to an enhancement of the counterion density near the surface above and beyond that of a uniform, charged surface. We confirm these predictions with Monte Carlo simulations. Our study focuses on the weak- to moderate-coupling regime which is complementary to a similar investigation performed by Moreira and Netz (Europhys. Lett., 57 (2002) 911) in the strong-coupling case.
PACS: 82.70.-y – Disperse systems; complex fluids / 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc
© EDP Sciences, 2002