Table 2. Zeta Potential Values of nBGPs Obtained with Different NH4OH Concentrations.
| NH4OH concentration (M) | zeta potential (mV) |
|---|---|
| 0.14 | –14 ± 4 |
| 0.21 | –18 ± 4 |
| 0.33 | –20 ± 5 |
| 0.57 | –14 ± 4 |
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