TABLE 2.
Shows the parameters describing the chromium and gold layers of the modified quartz substrate as a function of the applied electrode potential
| Chromium
|
Gold
|
|||||
|---|---|---|---|---|---|---|
| System (potential vs. SCE) | τ* | SLD† | σ‡ | τ* | SLD† | σ‡ |
| h-DMPC + chol (E = 50 mV) | 38.2 ± 2.2 | 3.34 ± 0.06 | 3.2 | 115.7 ± 1.4 | 4.73 ± 0.05 | 5.9 |
| h-DMPC + chol (E = −375 mV) | 38.3 ± 2.8 | 3.37 ± 0.07 | 5.6 | 112.7 ± 1.6 | 4.59 ± 0.02 | 4.3 |
| h-DMPC + chol (E = −500 mV) | 39.5 ± 2.5 | 3.34 ± 0.06 | 6.6 | 112.9 ± 1.6 | 4.51 ± 0.02 | 3.7 |
| h-DMPC + chol (E = −600 mV) | 39.1 ± 2.2 | 3.35 ± 0.05 | 6.6 | 116.5 ± 1.5 | 4.66 ± 0.06 | 6.1 |
| h-DMPC + chol (E = −700 mV) | 38.2 ± 1.9 | 3.24 ± 0.06 | 2.7 | 116.8 ± 1.3 | 4.64 ± 0.05 | 5.0 |
| h-DMPC + chol (E = −800 mV) | 38.2 ± 2.4 | 3.24 ± 0.08 | 2.7 | 116.8 ± 1.4 | 4.64 ± 0.07 | 5.0 |
| h-DMPC + chol (E = −950 mV) | 38.4 ± 2.0 | 3.42 ± 0.05 | 2.7 | 114.0 ± 1.5 | 4.70 ± 0.04 | 4.8 |
| d-DMPC + chol (E = −800 mV)§ | 42.4 ± 2.9 | 3.40 ± 0.05 | 6.5 | 194.1 ± 1.7 | 4.40 ± 0.07 | 6.6 |
The parameters were obtained from the best-fit results of the measured neutron reflectivity curves shown in Figs. 5–7.
*
Thickness of layer in Å.
†
Scattering length density × 106 Å−2.
‡
Roughness in Å.
§
The measurements involving deuterated DMPC were not performed on the same gold-coated quartz crystal as the measurements involving the h-DMPC.