CdSe/CdS QD characterization in 10 mM NaCl. QD hydrodynamic diameter was measured in 10 mM NaCl at pH 7.4 and 23 °C using DLS. Measurements were made in triplicate for n = 3 batches with the standard error of mean (SEOM) reported below. Zeta potentials (ζ-potential) were measured using laser Doppler anemometry.

Particle	Surface functionality	Size ± SEOM	ζ-potential ± SEOM
QD-MPA	MPA	11.3 ± 1.7	−30.1 ± 5.5
QD-PEG-OH	PEG-OH	23.9 ± 2.0	−13.1 ± 1.5
QD-PEG-OMe	PEG-OMe	17.3 ± 0.8	−8.3 ± 3.7