Characterisation of pH responsive microgels at oil-water interface.
pH-sensitive soft materials are ubiquitous at oil-water interfaces in soft matter. Here we propose to study the pH-responsiveness of soft charged microgels at interfaces using the newly developed quartz-cell that allows to measure these microgels at oil-water interfaces and change the pH in situ. This study is fundamental to characterize the out-of-plane structure of charged microgels at oil-water interfaces. To date many ex-situ techniques reveal differences in the microgel arrangement at the interface due to microgel charges. Our study proposes to measure the microgel structure at different pH and charges condition in situ. The use of both deuterated monomer ([C6D7H4NO]n) and of a low neutron adsorbing oil (perfluoroctoane) will ensure data with high contrast for all experimental conditions. The data for the different contrasts will be fitted simultaneously using a multi-layer model (at least three layers needed). Despite the intrinsic scientific interest on the out-of-plane-behavior of microgels, this proposal is aimed to test the new quartz-cell and will open the possibility to perform experiments at the oil-water interface with the possibility to change the pH in situ.
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Andrea Scotti; BOCHENEK Steffen; Armando Maestro; RICHTERING Walter; SCHMIDT Maximilian Marcel and TUMMINO Andrea. (2021). Characterisation of pH responsive microgels at oil-water interface.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1626
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