Table 1.
Comparison of SBA and HMM materials.
| SBA-1 | SBA-2 | HMM-1 | HMM-2 | |
|---|---|---|---|---|
| First synthesis | 1994 | 1995 | 1999 | 1999 |
| Type of material | Mesoporous Silica Materials | Periodic Mesoporous Organosilicas (PMOs) | ||
| Type of structure | 3-dimentional (3D) cubic |
3-dimentional (3D) mixed hexagonal and cubic | 2-dimentional (2D) hexagonal |
3-dimentional (3D) hexagonal |
| Symmetry | Pmn | P63/mmc | p6mm | P63/mmc |
| Surface area (m2/g) | 1200–1450 | ~600 | ~1000 | ~1200 |
| Pore size (nm) | 2.1–2.6 | 3.5 | 3.1 | 2.7 |
| Position of main X-ray reflections (2θ) | 2°–3° | 2°–7° | 1.8°–4° | 2°–4° |
| Crystallographic planes (hkl) | (200), (210), (211) | (100), (002), (101), (110), (103), (112), (211) | (100), (110), (200) | (100), (002), (101), (110), (103), (112) |