Stephen Keen, Alison Yao, Jonathan Leach, Roberto Di Leonardo, Chris Saunter, Gordon Love, Jonathan Cooper and Miles Padgett
We demonstrate the technique of multipoint viscosity measurements incorporating the accurate calibration of micron sized particles. We describe the use of a high-speed camera to measure the residual motion of particles trapped in holographic optical tweezers, enabling us to calculate the fluid viscosity at multiple points across the field-of-view of the microscope within a microfluidic system.
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