Table 4. Surface concentrations, given in atomic%, obtained by XPS investigations probing the composition within the topmost 0.01 μm of dry fishing lines in A. luminosa and a urea powder characterised for reference purposes.
| Elements | Droplet 1 [atom %] | Droplet 2 [atom %] | Droplet 2 after H2O wash [atom %] | Urea [atom %] | Uric acid [atom %] |
|---|---|---|---|---|---|
| Carbon | 53.5; 53.6 | 44.6; 45.4 | 64.3 | 37.7 | 50.8 |
| Nitrogen | 14.5; 16.5 | 16.2; 19.3 | 17.3 | 41.9 | 27.5 |
| Oxygen | 24.5; 25.9 | 27.4; 29.2 | 16.3 | 20.4 | 21.1 |
| Silicium | 1.6 | 1.7; 2.0 | 1.3 | - | - |
| Sodium | 1; 1.1 | 1; 2 | - | - | 0.6 |
| Magnesium | - | - | - | - | - |
| Phosphorus | 2.4; 2.7 | 3.4; 3.8 | 0.4 | - | - |
| Sulphur | 0.5; 0.6 | 0.4; 0.5 | 0.3 | - | - |
| Chloride | - | - | - | - | - |
| Potassium | - | 0.8; 1.2 | - | - | - |
| Calcium | - | 0.3; 0.8 | - | - | - |