Multipoint viscosity measurements in microfluidic channels using optical tweezers

Stephen Keen, Alison Yao, Jonathan Leach, Roberto Di Leonardo, Chris Saunter, Gordon Love, Jonathan Cooper, Miles Padgett

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)
168 Downloads (Pure)


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.

Original languageEnglish
Pages (from-to)2059-2062
Number of pages4
JournalLab on a Chip
Issue number14
Publication statusPublished - 2009


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