Quantitative Rheo-Microscopy with a Modular Compact Rheometer
The ability to simultaneously observe and characterize processes at the microscopic, mesoscopic, and macroscopic scales during mechanical deformation has become an essential requirement in modern rheology.
A multiscale perspective provides the crucial link between the rearrangements and dynamic responses of a material’s elementary constituents and the emergent rheological behavior observed at the continuum level. It also offers an invaluable means to monitor and quantify flow non-idealities, such as wall slip and shear banding. In this technical note, we demonstrate how accurately synchronized rheo-microscopy experiments can be performed to correlate the motion of elementary constituents—such as droplets or embedded tracer particles—with the macroscopic deformation. This framework is compatible with a wide range of real-space and Fourier-space techniques, enabling the acquisition of fully synchronized microscopy and rheological data.
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