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| S.no | type of system | average particle diameter (nm) | zeta potential (mV) |
|---|---|---|---|
| 1 | TX-100 surfactant (600 ppm) microemulsion | 115 | –31.1 |
| 2 | PHPA (1000 ppm) + surfactant (600 ppm) microemulsion | 196 | –33.2 |
