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Related Experiment Video

Updated: Jun 22, 2026

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies
06:53

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

Published on: November 18, 2022

Multipoint viscosity measurements in microfluidic channels using optical tweezers.

Stephen Keen1, Alison Yao, Jonathan Leach

  • 1SUPA, Department of Physics and Astronomy, University of Glasgow, Glasgow, UK.

Lab on a Chip
|July 2, 2009
PubMed
Summary

We developed a new method for multipoint viscosity measurements using calibrated microparticles and holographic optical tweezers. This technique accurately determines fluid viscosity at multiple locations within microfluidic systems.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Optical physics

Background:

  • Viscosity measurement is crucial for understanding fluid behavior in microfluidic devices.
  • Traditional methods can be time-consuming and lack spatial resolution.
  • Accurate calibration of probe particles is essential for reliable measurements.

Purpose of the Study:

  • To present a novel technique for multipoint viscosity measurements.
  • To demonstrate the application of holographic optical tweezers for viscosity determination.
  • To enable precise fluid characterization within microfluidic systems.

Main Methods:

  • Utilizing holographic optical tweezers to trap micron-sized particles.
  • Employing a high-speed camera to record particle motion.

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Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers

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Quantitative Analysis of Viscoelastic Properties of Red Blood Cells Using Optical Tweezers and Defocusing Microscopy
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Quantitative Analysis of Viscoelastic Properties of Red Blood Cells Using Optical Tweezers and Defocusing Microscopy

Published on: March 25, 2022

Related Experiment Videos

Last Updated: Jun 22, 2026

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies
06:53

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

Published on: November 18, 2022

Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
09:56

Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers

Published on: August 31, 2021

Quantitative Analysis of Viscoelastic Properties of Red Blood Cells Using Optical Tweezers and Defocusing Microscopy
08:03

Quantitative Analysis of Viscoelastic Properties of Red Blood Cells Using Optical Tweezers and Defocusing Microscopy

Published on: March 25, 2022

  • Accurate calibration of particle size and properties for viscosity calculations.
  • Calculating viscosity at multiple points across the microscope's field-of-view.

    • Main Results:

    • Successfully demonstrated multipoint viscosity measurements in a microfluidic system.
    • Achieved accurate viscosity determination through precise particle calibration.
    • The technique provides high spatial resolution for fluid analysis.

    Conclusions:

    • The developed method offers an efficient and accurate approach for multipoint viscosity measurements.
    • Holographic optical tweezers combined with high-speed imaging are effective for microfluidic fluid characterization.
    • This technique has significant potential for applications in microfluidics research and development.