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| recipe # | D_1 | D_2 | D_3 | D_4 |
|---|---|---|---|---|
| molar ratio (H2O/ETOH/DOWFAX 2A1/APTES/TEOS) | 833/25/1/0.7/2.5 | 833/25/1/0.7/2.5 | 926/29/1/0.3/1.3 | 1159/35.5/1/0.4/0.9 |
| stirring speed (rpm) | 0 | 100 | 300 | 400 |
| temperature (°C) | 80 | 80 | 70 | 70 (2 h), 25 (22 h) |
| reaction time (days) | 1 | 1 | 2 | 1 |
| size (nm) | 260 ± 26 | 257 ± 34 | 129 ± 32 | 52 ± 11 |
| shape | irregular | irregular | spherical | spherical |
| organic content (%) | 29 | 29 | 35 | 42 |
