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Microstructured Devices for Optimized Microinjection and Imaging of Zebrafish Larvae
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Microscopic artificial swimmers.

Rémi Dreyfus1, Jean Baudry, Marcus L Roper

  • 1Laboratoire Colloïdes et Matériaux Divisés, ESPCI, UMR CNRS 7612 UPMC, ParisTech, 10 rue Vauquelin, 75005 Paris, France. remi.dreyfus@espci.fr

Nature
|October 7, 2005
PubMed
Summary
This summary is machine-generated.

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Researchers created a flexible artificial flagellum using magnetic nanoparticles and DNA. This novel structure, attached to a red blood cell, mimics natural flagella for controlled micro-scale swimming using external magnetic fields.

Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Microorganisms use flagella for propulsion, with bacterial flagella rotating like corkscrews and eukaryotic flagella exhibiting beating motions.
  • Controlled swimming of artificial micro-structures remains a significant challenge in nanotechnology and biophysics.

Purpose of the Study:

  • To develop a controllable artificial flagellum for micro-scale locomotion.
  • To investigate the actuation and propulsion mechanisms of a novel artificial flagellum.

Main Methods:

  • Constructed a flexible artificial flagellum from a linear chain of colloidal magnetic particles linked by DNA.
  • Attached the artificial flagellum to a red blood cell.
  • Utilized external uniform and oscillating transverse magnetic fields for alignment and actuation.

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Main Results:

  • The artificial flagellum exhibited a beating pattern when actuated by oscillating magnetic fields.
  • The structure successfully propelled the red blood cell, demonstrating controlled swimming.
  • External magnetic fields allowed for adjustable control over the velocity and direction of motion.

Conclusions:

  • A DNA-linked colloidal magnetic particle chain can function as a flexible artificial flagellum.
  • External magnetic fields provide a viable method for controlling artificial micro-swimmers.
  • This work paves the way for engineered micro-devices capable of directed movement.