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XPS measurements of the membranes (0.2 μm) before any treatment, after plasma polymer coating, coating with the initiator layer and with the pHEMA layer.
| Membrane | C 1s (%) | O 1s (%) | N 1s (%) | Br 3p (%) |
|---|---|---|---|---|
| Raw | 75.7 | 24.3 | 0 | 0 |
| NH2 | 84.4 | 3.9 | 11.7 | 0 |
| Initiator | 74.0 | 13.7 | 10.7 | 1.6 |
| HEMA (1%) | 74.3 | 24.3 | 1.4 | 0 |
| HEMA (25%) | 66.6 | 33.4 | 0 | 0 |
| HEMA(cal.) | 66.7 | 33.3 | 0 | 0 |
