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(a) Number-average hydrodynamic diameters and (b) electrophoretic mobilities of MPA- and MPNH2-functionalized gold nanoparticles (AuNPs) as a function of solution ionic strength. All values were measured at a (particle number) concentration of 12.8 nM in 2 mM HEPES solution (pH 7.4). The desired ionic strength was achieved by the addition of NaCl. Error bars represent one standard deviation (n = 10).
