Hollow microgel in highly packed samples: SANS with contrast variation study.
Hollow microgels are particles where a silica core, surrounded by a polymeric crosslinked shell, is dissolved leading to soft particles with a cavity at their center. We have verified that, in diluted suspensions, the cavity is present both in the swollen and deswollen state. No information about this system in concentrated suspensions are available. We have performed rheological measurements covering a wide range of concentration, from loosely packed up to highly overpacked suspensions. For the same sample we have investigated their phase behavior at different concentrations. We propose to study the deformation of these particles in response to an increase of the sample concentration. To do this we have made samples at different concentrations where few protonated hollow microgel are dispersed in a matrix of deuterated particles that are matched with the solvent. In this way SANS allows to study the form factor of hollow particles in concentrated suspensions. This is the only scattering technique able to do this. We will fit the data with our model for hollow fuzzy spheres. We will use this information to rationalize both the phase behavior and the flow priorities of this system.
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Andrea Scotti; BRUGNONI Monia; RICHTERING Walter and SCHWEINS Ralf. (2018). Hollow microgel in highly packed samples: SANS with contrast variation study.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1855