Structural data of the SBA-15 particles with different morphology types from SEM and SAXS.
| Particle | Platelets | Primary | Rods |
|---|---|---|---|
| D a (nm) | 870 ± 90d | 570 ± 50 | 210 ± 30 |
| L a (nm) | 390 ± 40 | 400 ± 40 | 1200 ± 400 |
| ρ = D/L | 2.2 ± 0.4 | 1.4 ± 0.3 | 0.18 ± 0.08 |
| X b (nm) | L = 410 ± 5 | 2R = 540 ± 5 | D = 180 ± 5 |
| σ b (%) | 19 | 12 | 20 |
| a 0 c (nm) | 9.8 ± 0.1 | 9.8 ± 0.1 | 10.9 ± 0.1 |
a
Dimensions measured by SEM (statistics over 100 particles with the error given by the standard deviation).
b
Average size and polydispersity in size (via the Schulz–Zimm distribution) obtained by fitting the cSAXS data using the platelet, sphere (for primary particles) and rod models, respectively.
c
Lattice parameter a0 obtained from the Bragg peaks positions on the SAXS data.
d
Measured along the long diagonal of the hexagonally-shaped particles.