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Zeta Potential measurement as a function of pH for SiO2-coated MNPs and the same one functionalized with the GOPTS-bPEI (a); pH-depended potentiometric titration versus pH for pure hyper-branched polyethyleneimine (bPEI) (b) and number-sized distribution of hydrodynamic diameter at pH = 6 in aqueous media (c).
