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(a) π–A isotherms of the subphase of DPPC monolayer with water and 0.1 mmol·L–1 sodium salts solution. From top to bottom: DPPC on NaSCN, NaClO4, NaBF4, NaI, NaNO3, NaBr, NaCl solutions and on water. (b) Monolayer π as a function of the square root of salt concentration for a lipid area of 85 Å2. Reprinted with permission from ref (23). Copyright 2004 American Chemical Society.
