Table 1.
Physicochemical properties of the QDs
| QD | Hydrodynamic diameter (nm) b | ζ potential (mV) at pH 5 c | ζ potential (mV) at pH 6 c | Classification |
|---|---|---|---|---|
| A a | 9.9 ± 0.8 | -27.6 ± 3.2 | -27.0 ± 1.7 | Anionic |
| B | 21.0 ± 0.6 | -1.2 ± 0.3 | -2.5 ± 3.2 | Neutral |
| C | 21.8 ± 1.2 | 27.6 ± 0.8 | 26.9 ± 1.3 | Cationic |
| D | 21.4 ± 2.0 | 36.9 ± 1.1 d | 30.0 ± 1.6 d | Cationic |
a
This is the largest anionic QD available from this vendor.
b
Mean ± SD of 6–9 measurements.
c
Mean ± SD of 3–6 measurements.
d
QD D is more cationic than QD C (p < 0.05).