TY - JOUR
T1 - Charge inversion at high ionic strength studied by streaming currents
AU - Van Der Heyden, Frank H.J.
AU - Stein, Derek
AU - Besteman, Koen
AU - Lemay, Serge G.
AU - Dekker, Cees
PY - 2006
Y1 - 2006
N2 - We report charge inversion, the sign reversal of the effective surface charge in the presence of multivalent counterions, for the biologically relevant regimes of divalent ions and mixtures of monovalent and multivalent ions. Using streaming currents, the pressure-driven transport of countercharges in the diffuse layer, we find that charge inversion occurs in rectangular silica nanochannels at high concentrations of divalent ions. Strong monovalent screening is found to cancel charge inversion, restoring the original surface charge polarity. An analytical model based on ion correlations successfully describes our observations.
AB - We report charge inversion, the sign reversal of the effective surface charge in the presence of multivalent counterions, for the biologically relevant regimes of divalent ions and mixtures of monovalent and multivalent ions. Using streaming currents, the pressure-driven transport of countercharges in the diffuse layer, we find that charge inversion occurs in rectangular silica nanochannels at high concentrations of divalent ions. Strong monovalent screening is found to cancel charge inversion, restoring the original surface charge polarity. An analytical model based on ion correlations successfully describes our observations.
UR - http://www.scopus.com/inward/record.url?scp=33744786803&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.96.224502
DO - 10.1103/PhysRevLett.96.224502
M3 - Article
C2 - 16803311
AN - SCOPUS:33744786803
SN - 0031-9007
VL - 96
JO - Physical review letters
JF - Physical review letters
IS - 22
M1 - 224502
ER -