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Charge inversion at minute electrolyte concentrations.

J Pittler1, W Bu, D Vaknin

  • 1Institute of Experimental Physics I, University of Leipzig, D-04103 Leipzig, Germany.

Physical Review Letters
|August 16, 2006
PubMed
Summary
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Lanthanum ions (La3+) strongly adsorb to anionic lipid monolayers, causing surface overcharging at very low concentrations. This phenomenon, observed at much lower concentrations than predicted, may involve interfacial electrostatic correlations.

Area of Science:

  • Physical Chemistry
  • Surface Science
  • Colloid Science

Background:

  • Anionic lipid monolayers exhibit complex interactions with multivalent cations.
  • Understanding cation adsorption and surface charge behavior is crucial for interfacial phenomena.

Purpose of the Study:

  • To investigate the adsorption of lanthanum ions (La3+) onto anionic dimyristoylphosphatidic acid (DMPA) monolayers.
  • To determine the conditions leading to surface overcharging at low bulk salt concentrations.

Main Methods:

  • Anionic dimyristoylphosphatidic acid monolayers were prepared on lanthanum chloride (LaCl3) solutions.
  • Anomalous X-ray reflectivity was employed to measure La3+ surface accumulation.

Main Results:

Related Experiment Videos

  • Strong La3+ adsorption and surface overcharging were observed at unexpectedly low bulk concentrations.
  • A Stern layer formed with approximately 1 La3+ per 3 lipids below a critical concentration (ct ≈ 500 nM).
  • Surface concentration reached approximately 1 La3+ per lipid above ct, indicating charge inversion.

    • Conclusions:

    • Surface overcharging occurred at concentrations significantly lower (4 orders of magnitude) than predicted by ion-ion correlation theories.
    • Transverse electrostatic correlations, such as interfacial Bjerrum pairing, are proposed as a contributing mechanism for charge inversion.