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Direct observation of charge inversion by multivalent ions as a universal electrostatic phenomenon



Direct observation of charge inversion by multivalent ions as a universal electrostatic phenomenon



Physical Review Letters 93(17): 170802



We have directly observed reversal of the polarity of charged surfaces in water upon the addition of trivalent and quadrivalent ions using atomic force microscopy. The bulk concentration of multivalent ions at which charge inversion reversibly occurs depends only very weakly on the chemical composition, surface structure, size, and lipophilicity of the ions, but is very sensitive to their valence. These results support the theoretical proposal that spatial correlations between ions are the driving mechanism behind charge inversion.

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Accession: 048799721

Download citation: RISBibTeXText

PMID: 15525062

DOI: 10.1103/physrevlett.93.170802


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