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Water and chloroform are shown, respectively, as white and light-blue shaded areas. The citrate–lipid exchange reaction at the water/POPC/chloroform interface makes possible the spontaneous transfer of Au NPs from the water phase to the chloroform phase. In the right zoom panel, we can observe that in chloroform the lipid tails face the hydrophobic solvent, while the heads are in contact with the Au surface.
