A stress-controlled shear cell for small-angle light scattering and microscopy
arXiv:1603.06703 · doi:10.1063/1.4972253
Abstract
We develop and thoroughly test a stress-controlled, parallel plates shear cell that can be coupled to an optical microscope or a small angle light scattering setup, for simultaneous investigation of the rheological properties and the microscopic structure of soft materials under an imposed shear stress. In order to minimize friction, the cell is based on an air bearing linear stage, the stress is applied through a contactless magnetic actuator, and the strain is measured through optical sensors. We discuss the contributions of inertia and of the small residual friction to the measured signal and demonstrate the performance of our device in both oscillating and step stress experiments on a variety of viscoelastic materials.
14 pages, 10 figures
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- Microscopic precursors of failure in soft matter
- Yielding, shear banding and brittle failure of amorphous materials
- Deformation profiles and microscopic dynamics of complex fluids during oscillatory shear experiments
- 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
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