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Published February 18, 2015 | Supplemental Material
Journal Article Open

Reversible Swarming and Separation of Self-Propelled Chemically Powered Nanomotors under Acoustic Fields

Abstract

The collective behavior of biological systems has inspired efforts toward the controlled assembly of synthetic nanomotors. Here we demonstrate the use of acoustic fields to induce reversible assembly of catalytic nanomotors, controlled swarm movement, and separation of different nanomotors. The swarming mechanism relies on the interaction between individual nanomotors and the acoustic field, which triggers rapid migration and assembly around the nearest pressure node. Such on-demand assembly of catalytic nanomotors is extremely fast and reversible. Controlled movement of the resulting swarm is illustrated by changing the frequency of the acoustic field. Efficient separation of different types of nanomotors, which assemble in distinct swarming regions, is illustrated. The ability of acoustic fields to regulate the collective behavior of catalytic nanomotors holds considerable promise for a wide range of practical applications.

Additional Information

© 2015 American Chemical Society. Received 31 October 2014. Published online 29 January 2015. Published in print 18 February 2015. 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). T.X. and R.D. acknowledge financial support from the China Scholarship Council (CSC) and V.G. from Centro de Nanociencias y Nanotecnología UNAM Mexico.

Attached Files

Supplemental Material - ja511012v_si_001.pdf

Supplemental Material - ja511012v_si_002.mpg

Supplemental Material - ja511012v_si_003.mpg

Supplemental Material - ja511012v_si_004.mpg

Supplemental Material - ja511012v_si_005.mpg

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