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| Sample | NS (g) | APTES (g) | Mole ratio of –OH/APTES | Elemental analysis | Amine group densitya (mmol g−1) | ||
|---|---|---|---|---|---|---|---|
| N (wt%) | C (wt%) | H (wt%) | |||||
| ANS-1 | 6.0 | 0.16 | 5 : 1 | 0.07 | 0.39 | 0.119 | 0.05 |
| ANS-2 | 6.0 | 0.4 | 2 : 1 | 0.30 | 1.60 | 0.511 | 0.21 |
| ANS-3 | 6.0 | 0.8 | 1 : 1 | 0.64 | 3.48 | 0.887 | 0.46 |
| ANS-4 | 6.0 | 1.2 | 2 : 3 | 0.98 | 3.89 | 0.998 | 0.70 |
Determined via elemental analysis.
