Table 3.
Fitting parameters of five-layer model to neutron reflectivity profiles of macromolecular layers generated by sequential addition of PNIPAAM41-b-PAMPTMA(+)24 copolymer with and without γ-cyclodextrin (γ-CD) measured in D2O, H2O, and D2O/H2O mixtures
| Parameters | Copolymer 20 °C |
Copolymer 46 °C |
Copolymer + γ-CD 20 °C |
Copolymer + γ-CD 46 °C |
|---|---|---|---|---|
| SiO2 | ||||
| d ΝR/Å | 7 ± 1 | 7 ± 1 | 7 ± 1 | 7 ± 1 |
| Volume % solvent | 20 ± 5 | 20 ± 5 | 20 ± 5 | 20 ± 5 |
| ξ (SiO2–anchor)/Å | 3.0 ± 0.5 | 3.0 ± 0.5 | 3.0 ± 0.5 | 3.0 ± 0.5 |
| Anchor block | ||||
| d ΝR/Å | 10 ± 3 | 6.5 ± 1 | 10 ± 3 | 6.5 ± 2 |
| Volume % solvent | 65 ± 5 | 50 ± 5 | 65 ± 5 | 75 ± 5 |
| ξ (anchor-extended)/Å | 3.0 ± 0.5 | 3.0 ± 0.5 | 3.0 ± 0.5 | 3.0 ± 0.5 |
| Extended block | ||||
| d NR/Å | 60 ± 6 | 40 ± 4 | 60 ± 6 | 40 ± 4 |
| Volume % water | 93 ± 1 | 90 ± 1 | 93 ± 1 | 90 ± 1 |
| ξ (extended-solvent)/Å | 20 ± 3 | 13 ± 2 | 20 ± 3 | 13 ± 2 |
| γ-CD/PNIPAAM ratio | 0 ± 0 | 0 ± 0 | 0 ± 0.2 | 0.5 ± 0.2 |
d NR = layer thickness, ξ = roughness, ρ = scattering length density of macromolecules