TY - JOUR
T1 - Charge inversion by multivalent ions
T2 - Dependence on dielectric constant and surface-charge density
AU - Besteman, K.
AU - Zevenbergen, M. A.G.
AU - Lemay, S. G.
PY - 2005/12
Y1 - 2005/12
N2 - Charge inversion occurs when the effective charge of a surface exposed to solution reverses polarity due to an excess of counterions accumulating in the immediate vicinity of the surface. Using atomic force spectroscopy, we have directly measured the effect on charge inversion of changing the dielectric constant of the solvent and the surface-charge density. Both decreasing the dielectric constant and increasing the bare surface-charge density lower the charge-inversion concentration. These observations are consistent with the theoretical proposal that spatial correlations between ions are the dominant driving mechanism for charge inversion.
AB - Charge inversion occurs when the effective charge of a surface exposed to solution reverses polarity due to an excess of counterions accumulating in the immediate vicinity of the surface. Using atomic force spectroscopy, we have directly measured the effect on charge inversion of changing the dielectric constant of the solvent and the surface-charge density. Both decreasing the dielectric constant and increasing the bare surface-charge density lower the charge-inversion concentration. These observations are consistent with the theoretical proposal that spatial correlations between ions are the dominant driving mechanism for charge inversion.
UR - http://www.scopus.com/inward/record.url?scp=28844464042&partnerID=8YFLogxK
U2 - 10.1103/PhysRevE.72.061501
DO - 10.1103/PhysRevE.72.061501
M3 - Article
AN - SCOPUS:28844464042
SN - 1539-3755
VL - 72
JO - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
JF - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
IS - 6
M1 - 061501
ER -