Magnetic control of tubular catalytic microbots for the transport, assembly, and delivery of micro-objects

Alexander A. Solovev, Samuel Sanchez, Martin Pumera, Yong Feng Mei, Oliver C. Schmidt

Research output: Contribution to journalArticlepeer-review

344 Citations (Scopus)


Recently a significant amount of attention has been paid towards the devebpment of man-made synthetic catalytic micro- and nanomolars that can mimic biological counterparts in terms of propulsion power, motion control, and speed. However, only a few applications of such self-propelled vehicles have been described. Here the magnetic control of self-propelled catalytic Ti/Fe/Pt rolled-up microtubes (microbots) that can be used to perform various tasks such as the selective bading, transportation, and delivery of microscale objects in a fluid is shown; for instance, it is demonstrated for polystyrene particles and thin metallic films ("nanoplates"). Microbots self-propel by ejecting microbubbles via a platinum catalytic decomposition of hydrogen peroxide into oxygen and water. The fuel and surfactant concentrations are optimized obtaining a maximum speed of 275 μms-1 (5.5 body lengths per second) at 15% of peroxide fuel. The microbots exert a force of around 3.77 pN when transporting a single 5 μm diameter particle; evidencing a high propulsion power that allows for the transport of up to 60 microparticles. By the introduction of an Fe thin film into the rolled-up microtubes, their motion can be fully controlled by an external magnetic field.

Original languageEnglish
Pages (from-to)2430-2435
Number of pages6
JournalAdvanced Functional Materials
Issue number15
Publication statusPublished - 2010 Aug 9

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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