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| No. | Sample | Size, nm ± SD | Zeta-potential, mV ± SD |
| 1 | Graphene oxide (GO) | 1629.0 ± 201.6 | –38.8 ± 3.4 |
| 2 | Kaolin (KNPs) | 2203.0 ± 22.3 | –22.0 ± 0.7 |
| 3 | GO + KNPs | 1097.0 ± 81.9 | –45.6 ± 0.8 |
