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A microfluidic timer for timed valving and pumping in centrifugal microfluidics.

F Schwemmer1, S Zehnle, D Mark

  • 1Laboratory for MEMS Applications, IMTEK - Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany. frank.schwemmer@imtek.de.

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Summary

This study introduces a novel microfluidic timer for precise liquid handling in automated lab workflows. The centrifugal microfluidic device uses stored pneumatic energy for timed valving and pumping, enhancing laboratory automation.

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Laboratory Automation

Background:

  • Accurate timing is crucial for automating complex laboratory workflows, especially for sample and reagent delivery.
  • Centrifugal microfluidics offers a platform for integrated lab operations but requires precise control over fluidic events.

Purpose of the Study:

  • To develop and demonstrate a new unit operation for timed valving and pumping in centrifugal microfluidics.
  • To enable precise, on-demand control of liquid release and reagent delivery for automated assays.

Main Methods:

  • A novel microfluidic timer based on temporary storage and delayed release of pneumatic energy.
  • Loading the timer at a higher spinning frequency and initiating the countdown by reducing to a lower release frequency.
  • Demonstration using sequential liquid release, timed valving of assay reagents, and user-defined sequencing of liquid delivery.

Main Results:

  • Sequential release of 4 liquids demonstrated with precise timing (e.g., 2.7s ± 0.2s, 133.8s ± 2.3s).
  • Successful timed valving of reagents with varying wetting properties (contact angles 36-78°) and viscosities (0.9-5.6 mPa s).
  • On-demand valving from 4 inlet chambers in user-defined sequences controlled by the spinning protocol.

Conclusions:

  • The developed microfluidic timer provides accurate and programmable control over liquid handling operations.
  • The device is compatible with diverse reagent properties and integrates seamlessly into microfluidic test carriers.
  • It supports scalable fabrication and enhances the automation potential of centrifugal microfluidic systems.