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Published February 12, 2014 | Supplemental Material
Journal Article Open

Catalytic Iridium-Based Janus Micromotors Powered by Ultralow Levels of Chemical Fuels

Abstract

We describe catalytic micromotors powered by remarkably low concentrations of chemical fuel, down to the 0.0000001% level. These Janus micromotors rely on an iridium hemispheric layer for the catalytic decomposition of hydrazine in connection to SiO_2 spherical particles. The micromotors are self-propelled at a very high speed (of ∼20 body lengths s^(–1)) in a 0.001% hydrazine solution due to osmotic effects. Such a low fuel concentration represents a 10 000-fold decrease in the level required for common catalytic nanomotors. The attractive propulsion performance, efficient catalytic energy-harvesting, environmentally triggered swarming behavior, and magnetic control of the new Janus micromotors hold considerable promise for diverse practical applications.

Additional Information

© 2014 American Chemical Society. Received 20 December 2013. Published online 29 January 2014. Published in print 12 February 2014. This project received support from the Defense Threat Reduction Agency-Joint Science and Technology Office for Chemical and Biological Defense (Grant No. HDTRA1-13-1-0002). W.G. is a HHMI International Student Research fellow. The authors also thank R. Tam and I. Rozen for their help. The authors declare no competing financial interest.

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Supplemental Material - ja413002e_si_001.pdf

Supplemental Material - ja413002e_si_002.mpg

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Supplemental Material - ja413002e_si_004.mpg

Supplemental Material - ja413002e_si_005.mpg

Supplemental Material - ja413002e_si_006.mpg

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Supplemental Material - ja413002e_si_008.mpg

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Additional details

Created:
August 19, 2023
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October 18, 2023