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Magnetically Selective Versatile Transport of Microrobotic Carriers.

Xinghao Hu1,2, Keonmok Kim1, Abbas Ali1

  • 1Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea.

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This study demonstrates selective control over magnetic microrobotic carriers using patterned magnetic fields. Different sized magnetic beads and cells showed varied locomotion for precise transport in microvascular networks.

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applied magnetic fieldartificial microtubulemicromagnetmicrorobotic carriersingle‐cell delivery

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Area of Science:

  • Microrobotics and Biomedical Engineering
  • Biomagnetic Systems
  • Microfluidics

Background:

  • Field-driven transport systems are promising for biofunctionalized carriers in microrobotics and biomedicine.
  • Selective transport of different microrobotic carriers in microvascular networks remains a challenge.
  • Artificial microtubules offer transport pathways but lack selective control.

Purpose of the Study:

  • To demonstrate the selective manipulation and transport of microrobotics along a patterned micromagnet using applied magnetic fields.
  • To explore the controlled locomotion of different sized magnetic beads and immobilized cells.
  • To enable organized, targeted delivery of drugs or cells in microvascular channels.

Main Methods:

  • Utilized patterned micromagnet arrays to create controlled magnetic field gradients.
  • Employed magnetic beads of varying sizes as microrobotic carriers.
  • Applied external magnetic fields to induce and control microrobotic locomotion.
  • Immobilized cells with magnetic beads and nanoparticles for observation.

Main Results:

  • Achieved selective manipulation and transport of microrobotics based on bead size and applied field strength.
  • Observed varied locomotion patterns including unidirectional, selective rotation, bidirectional, and reversed movement.
  • Demonstrated varied locomotion of cells immobilized with magnetic beads and nanoparticles.
  • Showcased the potential for precise control over multiple microrobotic carriers simultaneously.

Conclusions:

  • Patterned magnetic fields enable selective control over microrobotic carrier locomotion.
  • This technique allows for differentiated transport of various microrobotic carriers, including cells.
  • The developed steering strategies are applicable for targeted drug and cell delivery in microvascular systems.