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- W2047759587 abstract "An extension of the counterion-condensation (CC) theory of linear polyelectrolytes has been developed for the case of a system containing a mixture of counterions of different valency, i and j. The main assumption in the derivation of the model is that the relative amount of the condensed counterions of the type i and j is strongly correlated and it is determined by the overall physical bounds of the system. The results predicted by the model are consistent, in the limiting cases of single species component, with those of the original CC theory. The most striking results are obtained for the cases of low charge density and excess of counterion species: in particular, an apparent positive binding cooperativity of divalent ions is revealed for small, increasing additions of M2+ ions to a solution containing a swamping amount of monovalent salt and a polyelectrolyte of low charge density. Apparent competitive binding of mono- and divalent ions derives as a bare consequence of the electrostatic interactions. Theoretical calculations of experimentally accessible quantities, namely single-(counter) ion activity coefficients, confirm the surprising predictions at low charge density, which qualitatively agree with the measured quantities." @default.
- W2047759587 created "2016-06-24" @default.
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- W2047759587 date "1991-10-01" @default.
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- W2047759587 title "Limiting-laws of polyelectrolyte solutions. Ionic distribution in mixed-valency counterions systems. I: The model" @default.
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- W2047759587 doi "https://doi.org/10.1016/0301-4622(91)87211-m" @default.
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