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Related Experiment Videos

Particle tracking techniques for electrokinetic microchannel flows.

Shankar Devasenathipathy1, Juan G Santiago, Kohsei Takehara

  • 1Department of Mechanical Engineering, Stanford University, California 94305, USA.

Analytical Chemistry
|August 15, 2002
PubMed
Summary

Particle tracking velocimetry (PTV) and micro-particle image velocimetry (micro-PIV) precisely measure electrokinetic flow in microfluidic devices. These techniques quantify fluid dynamics and wall mobility for advanced bioanalytical applications.

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Area of Science:

  • Fluid Dynamics
  • Microfluidics
  • Analytical Chemistry

Background:

  • Electrokinetic flow is crucial for microfluidic bioanalytical devices.
  • Accurate velocity measurements are needed to understand and optimize these systems.
  • Particle tracking offers high-resolution flow characterization.

Purpose of the Study:

  • To apply particle tracking velocimetry (PTV) and micro-particle image velocimetry (micro-PIV) for precise velocity measurements in electrokinetic flow.
  • To quantify flow phenomena in microfluidic bioanalytical devices.
  • To calibrate seed particles for accurate quantitative flow measurements.

Main Methods:

  • Utilized micrometer-resolution particle image velocimetry (micro-PIV) and particle tracking velocimetry (PTV).

Related Experiment Videos

  • Performed seed particle calibration experiments, including current monitoring for electroosmotic wall mobility.
  • Determined electrophoretic mobilities of fluorescent microspheres using PTV.
  • Applied micro-PIV with electric field prediction for electroosmotic flow velocity measurements.

    • Main Results:

    • Demonstrated similitude between electrical and velocity fields in a uniform zeta potential microchannel intersection.
    • Achieved simultaneous measurement of two distinct wall mobilities in a microchannel with nonuniform zeta potential.
    • Provided quantitative, spatially resolved velocity data for electrokinetic systems.

    Conclusions:

    • Particle tracking techniques, PTV and micro-PIV, are effective for detailed flow analysis in electrokinetic microfluidic devices.
    • Accurate calibration of seed particles and system parameters is essential for quantitative measurements.
    • These methods enable the study of complex flow behaviors, including nonuniform zeta potentials.