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A Pump-Free, Magnetorheological-Elastomer-Driven Oscillatory Microfluidic Device for Cell Manipulation.

Jialin Wu1,2, Wenju Liu1,3, Yong Liu4

  • 1Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China.

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|March 30, 2026
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Summary

This study introduces a pump-free microfluidic device using magnetorheological elastomers to control biological sample motion. The platform enables efficient cell and nanoparticle manipulation for bioanalysis and diagnostics.

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Materials Science

Background:

  • Controlling micro/nanoscale biological sample motion in microfluidics is vital for bioanalysis.
  • Existing methods often rely on bulky pumps or complex actuators, limiting portability and biocompatibility.

Purpose of the Study:

  • To develop a pump-free, portable, and biocompatible microfluidic device for precise control of biological sample motion.
  • To demonstrate the device's capability in particle focusing, cell separation, and nanoparticle concentration.

Main Methods:

  • A magnetorheological-elastomer (MRE)-driven oscillatory microfluidic (PMOM) device was designed and fabricated.
  • The device utilizes rotating magnets to actuate a deformable MRE membrane, generating oscillatory flow without external pumps or valves.
  • The MRE membrane's magnetic actuation drives fluid back and forth within the microchannel.

Main Results:

  • Achieved stable oscillatory flow with a pump-free, single-layer design.
  • Demonstrated ultralow blockage-ratio particle focusing (β = 0.0047).
  • Successfully performed size-dependent separation of blood and cancer cells, concentrated nanoscale extracellular vesicles, and induced platelet activation.

Conclusions:

  • The PMOM device offers a simple, biocompatible, and effective approach for pump-free microfluidic manipulation.
  • This platform advances elasto-inertial microfluidics for micro/nanoscale manipulation and mechanobiological studies.
  • The technology holds potential for portable diagnostic and bioanalytical applications.