Table 5.
Zeta potentials and hydrodynamic diameters SiO2 NPs in PBS buffer at 25°C.
| Zeta potential (mV) | Hydrodynamic size (nm) | ||||||
|---|---|---|---|---|---|---|---|
| DW | Time | SiO2 concentration | DW | Time | SiO2 concentration | ||
| 5 mg/ml | 10 mg/ml | 5 mg/ml | 10 mg/ml | ||||
| −28.2 ± 1.0A,a | 1 min | −36.3 ± 1.0B,b | −35.8 ± 0.4B,b | 287.6 ± 1.7A,a | 1 min | 269.4 ± 5.5B,b | 269.7 ± 4.7B,b |
| 1 h | −37.3 ± 1.2B,b | −36.5 ± 1.0B,b | 1 h | 250.4 ± 2.1C,b | 250.0 ± 4.7C,b | ||
| 24 h | −36.4 ± 1.8B,b | −36.7 ± 1.0B,b | 24 h | 247.9 ± 1.7C,b | 249.6 ± 4.3C,b | ||
| 48 h | −36.2 ± 1.1B,b | −36.3 ± 0.5B,b | 48 h | 247.4 ± 2.3C,b | 246.7 ± 1.4C,b | ||
| 7 d | −37.1 ± 1.1B,b | −37.0 ± 1.5B,b | 7 d | 270.4 ± 3.3B,b | 269.6 ± 1.6B,b | ||
Different letters (A–C) in the same column indicate significant differences between incubation times (p < 0.05). Different letters (a,b) in the same row indicate significant differences between NP concentrations (p < 0.05). Zeta potential and hydrodynamic radius of NPs in DW were measured in the absence of PBS as a control.