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We present a new light scattering setup coupled to a commercial rheometeroperated in the plate-plate geometry. The apparatus allows the microscopicdynamics to be measured, discriminating between the contribution due to theaffine deformation and additional mechanisms, such as plasticity. Lightbackscattered by the sample is collected using an imaging optical layout,thereby allowing the average flow velocity and the microscopic dynamics to beprobed with both spatial and temporal resolution. We successfully test thesetup by measuring the Brownian diffusion and flow velocity of dilutedcolloidal suspensions, both at rest and under shear. The potentiality of theapparatus are explored in the startup shear of a biogel. For small sheardeformations, $\gamma \le 2\%$, the rheological response of the gel is linear.However, striking deviations from affine flow are seen from the very onset ofdeformation, due to temporally and spatially heterogeneous rearrangementsbearing intriguing similarities with a stick-slip process.

physical review applied

A novel setup coupling space-resolved dynamic light scattering and  rheometetry unveils the heterogeneous flow field and non-affine dynamics in  startup shear of a gel