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Untethered soft magnetic pump for microfluidics-based Marangoni surfer.

Yu-Hsiang Lin1, Franco N Piñan Basualdo2, Venkatasubramanian Kalpathy Venkiteswaran2

  • 1Surgical Robotics Laboratory, Department of Biomechanical Engineering, University of Twente, 7522 NB, Enschede, The Netherlands. y.lin-1@utwente.nl.

Scientific Reports
|August 31, 2024
PubMed
Summary

This study introduces a novel magnetic micropump for controllable surfactant release, enhancing microfluidic propulsion. This innovation enables precise control over Marangoni surfers, advancing micro-robotics.

Keywords:
Marangoni propulsionMagnetic micropumpSoft magnet

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Area of Science:

  • Microfluidics and soft robotics.
  • Surface science and interfacial phenomena.

Background:

  • Microfluidics enables miniaturized systems for applications like robotic propulsion.
  • The solutal Marangoni effect, driven by surfactant release, propels micro-robots (Marangoni surfers) but lacks control.
  • Existing methods lack controllable surfactant release for Marangoni surfers.

Purpose of the Study:

  • To develop a controllable microfluidic propulsion system for Marangoni surfers.
  • To integrate a novel untethered magnetic pumping mechanism with microfluidics for enhanced propulsion control.
  • To investigate the performance and efficacy of the magnetic micropump system.

Main Methods:

  • Development of an untethered magnetic micropump utilizing soft magnet interaction.
  • Actuation of a membrane with a pumping force of 4.64 mN and deformation of 450 μm.
  • Numerical study of a nozzle/diffuser flow rectifier for net flow generation and investigation of pump flow rate versus actuation frequency.

Main Results:

  • Successful generation of a pumping force of 4.64 mN and membrane deformation of 450 μm.
  • Demonstration of net flow using a nozzle/diffuser flow rectifier.
  • Investigation and characterization of the micropump's flow rate in relation to actuation frequency.
  • Validation of the system's ability to control Marangoni surfer motion.

Conclusions:

  • The novel magnetic micropump significantly enhances the controllability of microfluidic propulsion systems.
  • This integrated system offers precise control over Marangoni surfers, opening new avenues in micro-robotics and biomedical applications.
  • The study demonstrates a viable method for controlled surfactant delivery in microfluidic devices.