Table 1.
Physico-chemical surface characteristics of the substratum materials.
| Polystyrene | Gold | Glass | Pluronic-coated glass | |
|---|---|---|---|---|
| Roughness (nm) | 13 ± 5 | 3 ± 1 | 4 ± 1 | 8 ± 3 |
| θw (°) | 80 ± 2 | 82 ± 3 | 10 ± 1 | 9 ± 3 |
| θf | 64 ± 2 | 65 ± 4 | 10 ± 1 | 14 ± 4 |
| θm | 35 ± 1 | 54 ± 2 | 34 ± 3 | 45 ± 2 |
| γ− (mJ m−2) | 10 ± 4 | 5 ± 2 | 55 ± 1 | 56 ± 2 |
| γ+ | 0 ± 0 | 0.3 ± 0.4 | 0.9 ± 0.2 | 2 ± 0.1 |
| γAB | 0 ± 0 | 2 ± 1 | 14 ± 1 | 19 ± 0.4 |
| γLW | 42 ± 0.3 | 32 ± 1 | 43 ± 1 | 37 ± 1 |
| γtot | 42 ± 0.3 | 33 ± 2 | 57 ± 0.2 | 56 ± 1 |
Surface roughness, contact angles measured with water (θw), formamide (θf), and methylene iodide (θm), and surface free energy parameters and components. Total surface free energy γtot results from Lifshitz–Van der Waals γLW and acid-base γAB components, and electron-donating γ− and electron-accepting γ+ parameters. ± signs represent standard deviations over measurements on three different substratum surfaces.