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The many origins of charge inversion in electrolyte solutions: effects of discrete interfacial charges | | J. Faraudo
; A. Travesset
; | | Date: |
20 Jan 2007 | | Journal: | J. Phys. Chem. C. 2007; 11; 987-994 | | Subject: | Soft Condensed Matter; Statistical Mechanics | | Abstract: | We show that charge inversion, i.e. interfacial charges attracting counterions in excess of their own nominal charge, is a general effect that takes place in most charged systems next to aqueous solutions with multivalent ions and identify three different electrostatic origins for this effect 1) counterion-counterion correlations, 2) correlations between counterions and interfacial charges and 3) complexation. We briefly describe the first two regimes and provide a detailed characterization of the complexation regime from united atom molecular dynamics simulation of a phospholipid domain in contact with an aqueous solution. We examine the expected conditions where each regime should apply and describe a representative experimental example to illustrate each case. We point out that our results provide a characterization of ionic distributions irrespectively of whether charge inversion takes place and show that processes such as proton release and transfer are also linked to ionic correlations. We conclude with a discussion of further experimental and theoretical implications. | | Source: | arXiv, cond-mat/0701500 | | Services: | Forum | Review | PDF | Favorites | |
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