Abstract
For lipids that form multilamellar vesicles, the interlamellar equilibrium spacing (D-spacing) depends on the chemical composition of the aqueous solution. For example, the D-spacing of phosphatidylcholine lipids increases with increasing KCl or KBr concentrations. However, the variation of D-spacing is specific to each salt. One can then consider binary solutions in which the fraction of ions is varied at constant total concentration. The question is whether the resulting D-spacing variation follows any general functional form when plotted versus fractional composition. We show that general variations of this kind can be parameterized with simple power functions that reflect the cooperativity or competition of ion types in binary mixtures.
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