Table 1.
Physical properties for mesostructured wormhole silicas prepared from sodium silicate and Jeffamine or Surfonamine surfactants as porogens.
| Surfactant | Surf./Si molar ratioa | Synthesis Temp. (°C) | d001b (nm) | SBET (m2/g) | Pore size (nm) | Wall thicknessd (nm) | Pore volume (cm3/g) |
|---|---|---|---|---|---|---|---|
| M2005 | 0.062 | 25 | 6.5 / 5.9 | 632 | 3.5 | 2.4 | 0.5 |
| 45 | 7.9 / 7.0 | 673 | 4.8 | 2.2 | 0.9 | ||
| 65 | 7.9 / 7.1 | 885 | 6.1 | 1.0 | 1.4 | ||
| T3000 | 0.083 | 25 | 6.4 / 5.9 | 936 | 5.0 | 0.9 | 1.3 |
| 45 | 6.6 / 6.4 | 964 | 6.0 | 0.4 | 1.5 | ||
| 65 | 7.2 / 7.2 | 881 | 6.7 | 0.5 | 1.8 | ||
| T5000 | 0.033 | 25 | -c | 1030 | 5.2 | - | 1.5 |
| 45 | -c | 882 | 8.2 | - | 2.0 | ||
| ML300 | 0.25 | 25 | 4.6 / 4.2 | 770 | 2.8 | 1.4 | 1.1 |
| MNPA1000 | 0.12 | 25 | 5.6 / 6.0 | 1012 | 5.2 | 1.5 | 1.4 |
a
Surfactant to silicon ratio used in the synthesis.
b
Basal spacings of as-made and calcined MSU-J silicas are separated by a slash (as-made / calcined).
c
The XRD reflections are not resolved.
d
The wall thickness was determined by subtracting the BJH pore size from the pore-pore correlation distance (d001).