Zeta potential measurements.
| Sample | Z potential |
|---|---|
| MNP | −25.21 |
| MNP@SiO2 | −29.35 |
| MNP@SiO2@NH2 | 17.03 |
| MNP@SiO2@NH@Fa (4) | 22.14 |
| MNP@SiO2@NHBoc@Fa (5) | 19.16 |
| MNP@SiO2@NHCOOH@Fa (6) | 10.96 |
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