(c).
| Ultrasonic cycles (s) | The average diameter (nm) | PDI | Zeta potential (mV) |
|---|---|---|---|
| 5-5 | 139.1 ± 2.4 | 0.295 ± 0.005 | −37.1 ± 1.1 |
| 10-10 | 131.2 ± 0.4 | 0.281 ± 0.011 | −40.1 ± 1.2 |
| 15-15 | 139.5 ± 1.2 | 0.299 ± 0.006 | −36.5 ± 2.2 |
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