Ultrasound-Modulated Bubble Propulsion of Chemically Powered Microengines
Abstract
The use of an ultrasound (US) field for rapid and reversible control of the movement of bubble-propelled chemically powered PEDOT/Ni/Pt microengines is demonstrated. Such operation reflects the US-induced disruption of normal bubble evolution and ejection, essential for efficient propulsion of catalytic microtubular engines. It offers precise speed control, with sharp increases and decreases of the speed at low and high US powers, respectively. A wide range of speeds can thus be generated by tuning the US power. Extremely fast changes in the motor speed (<0.1 s) and reproducible "On/Off" activations are observed, indicating distinct advantages compared to motion control methods based on other external stimuli. Such effective control of the propulsion of chemically powered microengines, including remarkable "braking" ability, holds considerable promise for diverse applications.
Additional Information
© 2014 American Chemical Society. Received 25 April 2014. Published online 4 June 2014. Published in print 18 June 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). T.X. acknowledges the China Scholarship Council (CSC) for financial support. W.G. is a HHMI International Student Research fellow. The authors thank Guoqing Pan and Michael Galarnyk for their help in the microengines preparation. The authors declare no competing financial interest.Attached Files
Supplemental Material - ja504150e_si_001.pdf
Supplemental Material - ja504150e_si_002.mpg
Supplemental Material - ja504150e_si_003.mpg
Supplemental Material - ja504150e_si_004.mpg
Supplemental Material - ja504150e_si_005.mpg
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Additional details
- Eprint ID
- 84463
- Resolver ID
- CaltechAUTHORS:20180122-141922167
- Defense Threat Reduction Agency (DTRA)
- HDTRA1-13-1-0002
- China Scholarship Council
- Howard Hughes Medical Institute (HHMI)
- Created
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2018-01-31Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field