Understanding and control of highly viscoelastic films composed 2:1 alpha-cyclodextrin/surfactant inclusion complexes
Alpha-cyclodextrin (aCD)/surfactant solutions spontaneously form highly viscoelastic films at the water/air interface. We have investigated these films over the last decade with the aims of understanding and controlling their behavior in order to design new functional coatings. We have found that the most viscoelastic films occur at lower than ambient temperature when there is a monolayer of 2:1 aCD:surfactant inclusion complexes. Crucial data on the interfacial composition from neutron reflectometry (NR), as well as data from complementary bulk techniques, led to the formation of this physical picture. Now we aim to understand better the origin of the viscoelasticity, so we have recorded various lab data on systems with 3 different surfactant head groups. Also, we aim to control better the magnitude of the viscoelasticity, so we have worked on mixtures with different complexes. Yet in both cases we are missing data on the interfacial composition. So we apply for neutron beam time on FIGARO as only NR can resolve this information. Indeed for the mixtures we will use selective deuteration to resolve the interfacial stoichiometry of different inclusion complexes for the first time.
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Richard A. Campbell; CAMPOS TERAN José; Glenn J. Coope; GUTFREUND Philipp; ONDO Daniel; SAERBECK Thomas; TELLAM James and YAN Yixuan. (2021). Understanding and control of highly viscoelastic films composed 2:1 alpha-cyclodextrin/surfactant inclusion complexes. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1622
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