(b).
| Ultrasonic time (min) | The average diameter (nm) | PDI | Zeta potential (mV) |
|---|---|---|---|
| 10 | 131.5 ± 1.7 | 0.280 ± 0.006 | −40.4 ± 2.4 |
| 20 | 105.8 ± 2.8 | 0.421 ± 0.024 | −37.0 ± 1.1 |
| 30 | 110.3 ± 2.5 | 0.374 ± 0.040 | −36.1 ± 2.5 |
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