Non-DLVO, steric and fluctuation forces
Non-DLVO, steric and fluctuation forces
Non-DLVO, steric and fluctuation forces
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Two types ofRepulsive ‘Hydration’ Forces (1)• Steric hydration <strong>forces</strong> b/n fluid-like amphiphilic surfaces Measured across soap films composed of various surfactant monolayersas well as across uncharged bilayers composed of lipids withzwitterionic or sugar headgroups Force range : 1-2 nm, Exponential decay length : 0.1-0.3 nm; both increase with the temp. <strong>and</strong> ‘fluidity’ of highly mobileamphiphilic structures Origin of this force : entropic-arising from overlap of thermally excitedchains <strong>and</strong> headgroups protruding from these surfaces (CH 14 &18)
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