FIG. 2.

(a) Water flux through the vesicle membrane and its ratio as a function of the salt concentration, with the temperature T = 350 K and vesicle diameter R = 28 nm. Lines are linear fittings for the same color data points. The salt-out and salt-in represent that the salt is outside and inside the vesicle, respectively. The flux ratio is salt-out/salt-in. (b) The corresponding potential energy of lipid-ion, lipid-water, lipid-solution, and lipid-lipid as a function of the salt concentration, where salt-out and salt-in also refer to the salt location. Error bars are shown for two independent MD runs.