Rediscovering the schulze-hardy rule in competitive adsorption to an air-water interface

Patrick C. Stenger, Stephen G. Isbell, Debra St Hillaire, Joseph A. Zasadzinski

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The ratio of divalent to monovalent ion concentration necessary to displace the surface-active protein, albumin, by lung surfactant monolayers and multilayers at an air-water interface scales as 2-6, the same concentration dependence as the critical flocculation concentration (CFC) for colloids with a high surface potential. Confirming this analogy between competitive adsorption and colloid stability, polymer-induced depletion attraction and electrostatic potentials are additive in their effects; the range of the depletion attraction, twice the polymer radius of gyration, must be greater than the Debye length to have an effect on adsorption.

Original languageEnglish (US)
Pages (from-to)10045-10050
Number of pages6
Issue number17
StatePublished - Sep 1 2009


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