Figure 11.
A schematic representation of the use of isotopic contrasts to highlight the structure of the interfacial layers formed by self-assembly of PS80-7EO on top of a COE-3 layer at the SiO2/water interface. Schematic (a) depicts the system in D2O solvent coupled with hydrogenated (H-PS80-7EO) nonionic surfactants, (b) depicts the system in CMAb (contrast matched to COE-3 with SLD = 2.56 × 10−6 Å−2) solvent coupled with hydrogenated (H-PS80-7EO) nonionic surfactants, (c) depicts the system in D2O solvent coupled with head deuterated (D-Head PS80-7EO) nonionic surfactant and (d) depicts the system in CMAb (contrast matched to COE-3 with SLD = 2.56 × 10−6 Å−2) solvent coupled with head deuterated (D-Head PS80-7EO) nonionic surfactants. The model schematics were based on simultaneous fittings of 4 reflectivity profiles measured under the 4 isotopic contrasts at the SiO2/water interface. COE-3 adsorption at 0.010 mg/mL mixed with 0.20 mg/mL protonated or deuterated PS80-7EO.