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Surface elemental composition determined by XPS (atomic %)
| Material | Si | O | C | N | F |
|---|---|---|---|---|---|
| Pristine SiO2 | 28.3 | 66.8 | 4.9 | — | — |
| APTES-MAnh | 22.1 | 56.7 | 18.2 | 3.0 | — |
| AFPCSMs | 12.8 | 32.1 | 37.6 | 2.3 | 15.2 |
Surface free energy of rocks with different materials
| Material | 0.01 wt% | 0.05 wt% | 0.10 wt% |
|---|---|---|---|
| APTES-MAnh | 59.72 mN/m | 51.46 mN/m | 45.78 mN/m |
| C-PFOTS | 37.18 mN/m | 12.79 mN/m | 6.20 mN/m |
| AFPCSMs | 33.10 mN/m | 6.18 mN/m | 1.44 mN/m |