Table 1. Hydrodynamic diameters, zeta potentials, and specific surface areas of fumed or precipitated SiO2 particles
| SiO2 | Z-average diameter (nm) | Zeta potential (mV) | BET (m2/g) |
| Fumed | 178.8±2.8a | -23.5±0.6 | 176.7±1.1 |
| Precipitated | 361.3±14.4b | -21.9±1.2 | 148.8±1.0 |
Different lowercase letters indicate significant differences between fumed SiO2 and precipitated SiO2 (p<0.05).