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Top: ζ potentials for a sample of 0.8 μM of CdSe QDs brought into water with 300 equivalents of PPA, at the three points in the titration labelled in Figure 2A. Bottom: schematic of the chemical processes at the surface of the QD as a function of pH consistent with optical, XPS, and ζ-potential data on the CdSe/PPA aqueous system. Co-ions in the electrostatic double layer have been omitted for clarity.
