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Charge inversion at high ionic strength studied by streaming currents.

Frank H J van der Heyden1, Derek Stein, Koen Besteman

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

Physical Review Letters
|June 29, 2006
PubMed
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Charge inversion, a surface charge reversal, occurs in nanochannels with multivalent ions. Monovalent ions can screen this effect, restoring the original surface charge. Ion correlations explain these findings.

Area of Science:

  • Colloid and Surface Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Understanding surface charge behavior is crucial in nanoscale systems.
  • Charge inversion, a reversal of effective surface charge, is observed with multivalent ions.
  • The role of ion type and concentration on surface charge dynamics is not fully understood.

Purpose of the Study:

  • To investigate charge inversion in silica nanochannels under biologically relevant ionic conditions.
  • To determine the influence of divalent ions and mixed ionic solutions on surface charge.
  • To explore the screening effect of monovalent ions on charge inversion.

Main Methods:

  • Utilized streaming currents to measure pressure-driven transport of countercharges.
  • Experimented with rectangular silica nanochannels.

Related Experiment Videos

  • Analyzed data using an analytical model based on ion correlations.

    • Main Results:

    • Observed charge inversion in silica nanochannels at high concentrations of divalent ions.
    • Demonstrated that strong monovalent ion screening cancels charge inversion.
    • Restored the original surface charge polarity by introducing monovalent ions.

    Conclusions:

    • Charge inversion is a significant phenomenon in nanochannels with multivalent ions.
    • Monovalent ions effectively screen charge inversion, controlling surface charge polarity.
    • The developed analytical model accurately describes the observed ion correlation effects.