Contrast variation measurements of core-shell particles and hollow PNIPAM microgels
Poly(N-isopropylacrylamide) microgels are stimuli-responsive polymer networks in the nanometer size range, swollen by a good solvent like water. At the volume phase transition temperature of 32°C in water, they change their size drastically. Different architectures of this polymer - like core-shell structures with different cores as well as hollow PNIPAM capsules have been synthesized. However the structure of those hollow spheres has not been characterized by means of neutron scattering, yet. Our preliminary SANS measurements indicate a deformation of the hollow spheres. Therefore we want to investigate a system of Polystyrene (PS) core PNIPAM shell particles with deuterated cores. We want to compare the formfactor of the core shell particle in a D2O/H2O solvent mixture matching the core, with the scattering behaviour of the corresponding hollow capsules. To investigate the structure of the hollow particles in detail, temperature dependent SANS measurements in the q-range of 0.0015 1/Å to 0.15 1/Å are required. These conditions are provided at the ILL beamline D11.
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DUBBERT Janine; LINDNER Peter; RICHTERING Walter and WALD Johanna. (2013). Contrast variation measurements of core-shell particles and hollow PNIPAM microgels. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1655
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