Binding effects in multivalent Gibbs-Donnan equilibrium

M. Castelnovo, A. Evilevitch

Research output: Contribution to journalArticlepeer-review


The classical Gibbs-Donnan equilibrium describes excess osmotic pressure associated with confined colloidal charges embedded in an electrolyte solution. In this work, we extend this approach to describe the influence of multivalent ion binding on the equilibrium force acting on a charged rod translocating between two compartments, thereby mimicking ionic effects on force balance during in vitro DNA ejection from bacteriophage. The subtle interplay between Gibbs-Donnan equilibrium and adsorption equilibrium leads to a non-monotonic variation of the ejection force as multivalent salt concentration is increased, in qualitative agreement with experimental observations.

Original languageEnglish (US)
Pages (from-to)635-641
Number of pages7
JournalEurophysics Letters
Issue number4
StatePublished - Feb 15 2006
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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