title: Rediscovering the Schulze-Hardy rule in competitive adsorption to an air-water interface.
abstract: 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.
authors.affiliation: Department of Chemical Engineering, University of California, Santa Barbara, California 93106-5080, USA.
authors.forename: Patrick C
authors.initials: PC
authors.lastname: Stenger
authors.forename: Stephen G
authors.initials: SG
authors.lastname: Isbell
authors.forename: Debra
authors.initials: D
authors.lastname: St Hillaire
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Zasadzinski
mesh_terms: D000327:Adsorption; D000388:Air; D000418:Albumins / Q000737:chemistry; D003102:Colloids / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008051:Lipid Bilayers / Q000737:chemistry; D015233:Models, Statistical; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011312:Pressure; D055672:Static Electricity; D013499:Surface Properties; D013500:Surface Tension; D013501:Surface-Active Agents; D014867:Water / Q000737:chemistry*
chemical_list: D000418:Albumins; D003102:Colloids; D008051:Lipid Bilayers; D011108:Polymers; D013501:Surface-Active Agents; D014867:Water; D011092:Polyethylene Glycols
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