Thermo-responsive microgels at air-water interfaces: specular neutronreflectometry study to obtain out-fo-plane density profiles
With specular neutron reflectometry it would be possible to determine the projected out-of-plane density profiles of microgels at air- water (D2O and ACMW) interfaces. We would like to investigate p(NIPAM) and p(NIPAM-co-DEAAM) microgels adsorbed to the interface at temperatures below (swollen) and above (collapsed) their VPTT of 32 °C and 20 °C, respectively. The interfacial particle density or surface occupancy will be managed by spreading microgel suspension directly at the surface. We want to study if microgels change their structure adsorbed to the interface, similar to the reported transition from a fuzzy to a hard sphere in bulk. The data is fitted with a suitable model (three and two layers) using MOTOFIT and the scattering length density profiles are obtained. The polymer volume fraction as a function of the distance from the interface will be calculated. These profiles could be further connected to the structure and deformation of microgels at air-water interfaces as a function of temperature.
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BOCHENEK Steffen; GUTFREUND Philipp; LIMA Lia; Armando Maestro; RICHTERING Walter; SCHMIDT Maximilian Marcel and Andrea Scotti. (2018). Thermo-responsive microgels at air-water interfaces: specular neutronreflectometry study to obtain out-fo-plane density profiles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1871
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