SANS with contrast variation measurements of the form factor of soft microgels under flow measured in the 1,2-plane
Microgels are soft objects which can deform and/or change their volume depending on the packing fraction they occupy in solutions. This aspect has been largely investigated in bulk by means of SANS with contrast variation to access the form factor of single microgels. The possibility for microgels to be deformed/collapsed also affects the flow properties of these colloidal solutions. For instance, the Cross model, typically used to capture the shear thinning and thickening in colloidal dispersion under shear, fails in reproducing the viscosity vs. shear rate behavior of solutions of ultra-soft microgels. Here, we propose to use small-angle neutron scattering with contrast variation to access the form factors of microgels under shear and verify if deformations of deswelling are present. We propose to use the 1,2-shear cell, available at ILL, to probe the scattering in the velocity ¿ velocity gradient plane that has been shown in the literature to be the experimental set-up more sensitive to bending or deformation of the samples.
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Andrea Scotti; FERNANDEZ NIEVES Alberto; Urs Gasser; Judith E. Houston; PORCAR Lionel and TOLSON Luke. (2021). SANS with contrast variation measurements of the form factor of soft microgels under flow measured in the 1,2-plane. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-2066
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