Stenger PC, Isbell SG, St Hillaire D, Zasadzinski JA
Rediscovering the schulze-hardy rule in competitive adsorption to an air-water interface. [Journal Article]
Langmuir 2009 Sep 1; 25(17):10045-50.
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.
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