Imparting magnetic dipole heterogeneity to internalized iron oxide nanoparticles for microorganism swarm control

  • Paul Seung Soo Kim
  • Aaron Becker
  • Yan Ou
  • Anak Agung Julius
  • Min Jun Kim
Research Paper
Part of the following topical collections:
  1. Nanotechnology in Biorobotic Systems

Abstract

Tetrahymena pyriformis is a single cell eukaryote that can be modified to respond to magnetic fields, a response called magnetotaxis. Naturally, this microorganism cannot respond to magnetic fields, but after modification using iron oxide nanoparticles, cells are magnetized and exhibit a constant magnetic dipole strength. In experiments, a rotating field is applied to cells using a two-dimensional approximate Helmholtz coil system. Using rotating magnetic fields, we characterize discrete cells’ swarm swimming which is affected by several factors. The behavior of the cells under these fields is explained in detail. After the field is removed, relatively straight swimming is observed. We also generate increased heterogeneity within a population of cells to improve controllability of a swarm, which is explored in a cell model. By exploiting this straight swimming behavior, we propose a method to control discrete cells utilizing a single global magnetic input. Successful implementation of this swarm control method would enable teams of microrobots to perform a variety of in vitro microscale tasks impossible for single microrobots, such as pushing objects or simultaneous micromanipulation of discrete entities.

Keywords

Tetrahymena pyriformis Iron oxide nanoparticles Magnetotaxis Swarm control Microrobot 

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Paul Seung Soo Kim
    • 1
  • Aaron Becker
    • 2
  • Yan Ou
    • 3
  • Anak Agung Julius
    • 3
  • Min Jun Kim
    • 1
  1. 1.Department of Mechanical Engineering and MechanicsDrexel UniversityPhiladelphiaUSA
  2. 2.Department of Cardiovascular SurgeryHarvard UniversityBostonUSA
  3. 3.Department of Electrical, Computer, and Systems EngineeringRensselaer Polytechnic InstituteTroyUSA

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